Coal bed methane, also known as coal seam gas or coalbed methane, is a form of natural gas extracted from coal beds. It provides a significant source of energy and has the potential to be developed further. However, extracting coal bed methane also produces large volumes of water that require careful management to avoid environmental and agricultural issues. Overall, coal bed methane is an important energy resource but its development needs to balance economic and environmental factors.
This document provides an overview of coal bed methane (CBM). It discusses the history of CBM, how it is formed through the bacterial breakdown of coal over time, and how it is extracted by removing groundwater pressure. The document also outlines India's significant CBM reserves of around 92 trillion cubic feet, techniques to enhance extraction including carbon dioxide injection, and potential uses of CBM for power generation, transportation fuel, and other industrial applications. It concludes by noting CBM could become a major clean energy contributor and opportunities for greenhouse gas removal through enhanced CBM projects.
Exploration and production method of Coal Bed Methane.Anubhav Talukdar
This document discusses the exploration and production methods of coal bed methane (CBM). It describes 3D seismic prospecting techniques used to explore CBM, including predicting based on burial depth, impedance inversion, frequency spectrum decomposition, and seismic attributes. CBM production passes through three phases - a dewatering phase with high water and low gas, a stable production phase with decreasing water and increasing gas, and a declining phase with low water and declining gas.
This document discusses coal bed methane (CBM) and CO2 sequestration. CBM is natural gas trapped within coal beds, and can be extracted through drilling wells into coal seams and lowering reservoir pressure. Injecting CO2 into coal beds can enhance CBM recovery while sequestering CO2 emissions. India has significant potential for CBM production given its large coal reserves. Key coalfields in India like Jharia, Raniganj and Bokaro contain many coal seams with good permeability and gas content, representing potential CBM blocks. India's policy framework supports the development of CBM through competitive bidding and tax incentives.
This document provides information on coal bed methane (CBM) as an energy source. It discusses what CBM is, how methane is trapped in coal, how CBM is extracted, India's CBM reserves and projects, challenges to commercial CBM development, and compares CBM to other energy resources. Key points are that CBM is a natural gas produced from coal seams, India has significant identified CBM reserves totaling over 4.6 trillion cubic meters, and major challenges to commercial CBM development in India include a lack of technical expertise and regulatory hurdles.
Coal bed methane (CBM) is methane found stored in coal seams. There are two main methods to estimate the amount of CBM in a region: drilling cores to measure gas content or performing calculations based on known coal characteristics. While CBM development provides benefits, the associated produced water poses challenges as it is often saline and sodic. Current management practices for CBM water include discharge to streams, land application, and impounding, but all methods risk subsurface impacts due to water quality issues. Proper management is needed to safely use CBM water for irrigation or disposal.
The document provides an overview of underground coal gasification (UCG). UCG involves injecting oxidants into unmined coal seams to convert coal into syngas. It has several benefits over traditional coal mining such as lower costs, reduced environmental impact, and leaving solid waste underground. However, it also faces challenges from geological and hydrological risks. Recent interest in UCG has grown due to high fuel prices and projects exist in countries like China, India, South Africa, and Australia to test and develop the technology.
Coal bed methane is a process that extracts natural gas from coal seams without mining the coal. Water is pumped into the underground coal seams to create fractures that allow the trapped methane gas to flow into wells drilled into the seams. The water and gas are then separately pumped up through the wells. While coal bed methane production avoids some mining costs and risks, it can negatively impact local groundwater and cause air pollution if not properly managed through water disposal and casing/cementing of wells.
Coal bed methane is natural gas formed during the coalification process and stored in coal seams. It is held in place by water pressure. CBM exploration involves mapping coal seams to determine their extent, thickness, permeability and gas content. Drilling uses mud circulation to remove cuttings and install casing for stability. Production involves hydraulic fracturing to increase permeability followed by dewatering to reduce water pressure and release the gas. Major CBM resources are found in Russia, China, the US, Australia and Canada while India has an estimated 1 TCM of reserves. Uses of CBM include fuel, electricity generation and supporting mine operations.
This document provides an overview of coal bed methane (CBM). It discusses the history of CBM, how it is formed through the bacterial breakdown of coal over time, and how it is extracted by removing groundwater pressure. The document also outlines India's significant CBM reserves of around 92 trillion cubic feet, techniques to enhance extraction including carbon dioxide injection, and potential uses of CBM for power generation, transportation fuel, and other industrial applications. It concludes by noting CBM could become a major clean energy contributor and opportunities for greenhouse gas removal through enhanced CBM projects.
Exploration and production method of Coal Bed Methane.Anubhav Talukdar
This document discusses the exploration and production methods of coal bed methane (CBM). It describes 3D seismic prospecting techniques used to explore CBM, including predicting based on burial depth, impedance inversion, frequency spectrum decomposition, and seismic attributes. CBM production passes through three phases - a dewatering phase with high water and low gas, a stable production phase with decreasing water and increasing gas, and a declining phase with low water and declining gas.
This document discusses coal bed methane (CBM) and CO2 sequestration. CBM is natural gas trapped within coal beds, and can be extracted through drilling wells into coal seams and lowering reservoir pressure. Injecting CO2 into coal beds can enhance CBM recovery while sequestering CO2 emissions. India has significant potential for CBM production given its large coal reserves. Key coalfields in India like Jharia, Raniganj and Bokaro contain many coal seams with good permeability and gas content, representing potential CBM blocks. India's policy framework supports the development of CBM through competitive bidding and tax incentives.
This document provides information on coal bed methane (CBM) as an energy source. It discusses what CBM is, how methane is trapped in coal, how CBM is extracted, India's CBM reserves and projects, challenges to commercial CBM development, and compares CBM to other energy resources. Key points are that CBM is a natural gas produced from coal seams, India has significant identified CBM reserves totaling over 4.6 trillion cubic meters, and major challenges to commercial CBM development in India include a lack of technical expertise and regulatory hurdles.
Coal bed methane (CBM) is methane found stored in coal seams. There are two main methods to estimate the amount of CBM in a region: drilling cores to measure gas content or performing calculations based on known coal characteristics. While CBM development provides benefits, the associated produced water poses challenges as it is often saline and sodic. Current management practices for CBM water include discharge to streams, land application, and impounding, but all methods risk subsurface impacts due to water quality issues. Proper management is needed to safely use CBM water for irrigation or disposal.
The document provides an overview of underground coal gasification (UCG). UCG involves injecting oxidants into unmined coal seams to convert coal into syngas. It has several benefits over traditional coal mining such as lower costs, reduced environmental impact, and leaving solid waste underground. However, it also faces challenges from geological and hydrological risks. Recent interest in UCG has grown due to high fuel prices and projects exist in countries like China, India, South Africa, and Australia to test and develop the technology.
Coal bed methane is a process that extracts natural gas from coal seams without mining the coal. Water is pumped into the underground coal seams to create fractures that allow the trapped methane gas to flow into wells drilled into the seams. The water and gas are then separately pumped up through the wells. While coal bed methane production avoids some mining costs and risks, it can negatively impact local groundwater and cause air pollution if not properly managed through water disposal and casing/cementing of wells.
Coal bed methane is natural gas formed during the coalification process and stored in coal seams. It is held in place by water pressure. CBM exploration involves mapping coal seams to determine their extent, thickness, permeability and gas content. Drilling uses mud circulation to remove cuttings and install casing for stability. Production involves hydraulic fracturing to increase permeability followed by dewatering to reduce water pressure and release the gas. Major CBM resources are found in Russia, China, the US, Australia and Canada while India has an estimated 1 TCM of reserves. Uses of CBM include fuel, electricity generation and supporting mine operations.
India is the 4th largest producer of manganese ore in the world, with Karnataka and Orissa having some of the largest deposits. Manganese ore occurs in various forms like massive, columnar, fibrous, botryoidal, and granular deposits. It is an important raw material used in steel production and also has various other industrial applications. The key manganese ore producing states in India are Karnataka, Orissa, Maharashtra, and Madhya Pradesh, which have deposits of different types including residual, sedimentary, hydrothermal, and metamorphosed ores.
Coal bed methane is natural gas found stored within coal beds. During the coalification process, organic material under heat and pressure produces volatile substances like methane and water that get trapped in the coal. The methane is stored primarily in the coal matrix and cleat fractures in the coal. To extract coal bed methane, wells are drilled into coal seams and groundwater is pumped out to lower pressure and release methane from the coal matrix and fractures. Estimating methane reserves involves extracting coal cores and measuring gas content or making calculations based on known coal characteristics and feasibility of development. Benefits include developing gas industries, generating government revenue, and utilizing produced water.
Currently, gas demand exceeds supply by 30 per cent. While the demand for natural gas in India is 118 million metric standard cubic meter per day (MMSCMD), the current supply from various sources is 80 MMSCMD, leaving a shortfall of 28 MMSCMD. That deficiency can be covered by CBM production.
study of CBM (Coalbed Methane) production processAsif Aslam
This document discusses coalbed methane (CBM) formation and production. CBM is formed during coalification from either chemical reactions or bacterial action. It is stored in the micropores and macropores (cleats) of coal. CBM production involves three phases - an initial dewatering phase to remove water from the cleats, a stable production phase where gas production increases as water production decreases, and a declining phase where production declines over time. Key factors that influence CBM production are total gas content, coal's sorption capacity, permeability, and diffusion properties.
The document describes the four main stages of mineral exploration:
1) Reconnaissance surveys involve wide-spaced geological mapping and surveys to identify areas for further study.
2) Preliminary exploration uses closer-spaced surveys and sampling to select target areas.
3) General exploration involves detailed mapping, sampling, and shallow drilling of small areas.
4) Detailed exploration uses closely-spaced drilling to determine the precise shape, size, and grade of ore bodies.
Coal bed methane with reference to indiaKiran Padman
Coal bed methane (CBM) refers to natural gas trapped in coal beds. CBM was previously considered a mining hazard but is now seen as a potential energy source. Global CBM production has increased in recent decades in countries like the US, Australia, and China. India has significant estimated CBM reserves of around 70 trillion cubic feet. While CBM development has faced challenges in India, it could help meet the country's growing energy demand and reduce reliance on imports. Enhanced recovery techniques using carbon dioxide injection may further increase CBM production potential in the future.
The document discusses coal bed methane (CBM), which is a gas that occurs in association with coal. CBM is stored in the micropores and fractures of coal. When the water pressure surrounding coal beds is reduced, the methane is able to desorb from the coal and flow to the wells. CBM production involves drilling wells into coal seams and pumping out water to lower pressure and release the trapped methane gas. While CBM is a potential energy source, its extraction can impact local water resources and ecosystems through water withdrawal and produced water management.
COAL MICROLITHOTYPES AND THEIR USAGE IN INTERPRETING DEPOSITION ENVIRONMENTOlusegun Ayobami Olatinpo
This document discusses coal microlithotypes and how their analysis can be used to interpret depositional environments. It defines microlithotypes as natural rock associations found within coal that are differentiated based on maceral percentages. Specific microlithotypes form from different plant communities and depositional conditions. Analyzing the microlithotype composition of coal samples can provide insights into the swamp environment where peat formed, such as forested, reed, or open water settings. This information is valuable for geological research and coal quality evaluation.
COAL BED METHANE (CBM); Coal Seam Gas (CSG), or Coal-mine Methane (CMM); What and why CBM?; How do we estimate the amount of methane gas which will come from a region underlain by coal? ; Benefits of CBM ; Coal seams as aquifers; CBM product water ; What is saline water and why is it considered saline?; What is sodic water and why is it considered sodic? ; Irrigation of crops with CBM water; Current management practices for disposal of CBM product water
Copper is an important metal that has been used for over 10,000 years. It has many important uses such as in construction, electronics, transportation and machinery. Copper is highly conductive and does not corrode easily. The global demand for copper is increasing due to growth in emerging economies but new copper mines are difficult to develop due to challenges such as high costs, environmental opposition and political instability. Copper recycling helps offset this demand and supply imbalance but not completely.
Coal is a fossil fuel formed from the remains of ancient vegetation. Pakistan has large coal reserves, especially in the Thar Desert which contains over 175 billion tonnes. Coal is classified based on its composition and burning characteristics, ranging from peat to anthracite based on carbon and moisture content. Classification systems also consider proximate analysis of fixed carbon, volatile matter, and calorific value. Coal analysis data can be reported on different bases depending on whether the moisture, ash, or mineral matter contents are excluded.
Bauxite types, mineralogy, Indian occurrencesPramoda Raj
The document discusses bauxite, including its mineral composition, locations of deposits, and uses. It notes that bauxite is the primary ore for aluminum production. India has significant bauxite reserves and is the 5th largest producer globally. The document outlines several important bauxite deposits in India, including in the states of Andhra Pradesh, Madhya Pradesh, Bihar, and Maharashtra. These deposits are typically associated with laterite soils and formed from weathering of igneous rocks under tropical conditions.
Coal forms from the sedimentation and metamorphosis of organic matter like plant material over millions of years. There are two main types of coal: sapropelic and humic. Sapropelic coals like boghead coal and cannel coal contain a high percentage of algae. Humic coals include peat, lignite, bituminous coal, sub-bituminous coal, and anthracite - classified based on the degree of metamorphosis from plant material to a harder, more carbon-rich rock. The different coal types are also distinguished by their color, hardness, heating value, and other physical properties.
Ore deposit related to clastic sedimentationPramoda Raj
The document discusses ore deposits related to clastic sedimentation, specifically focusing on placer deposits in the Witwatersrand gold and uranium deposits in South Africa. It describes how weathering processes contributed to mineral resources through various means. It defines different types of placer deposits that form in various environments, such as alluvial, beach, glacial, and fossil placers. It then provides details on the stratigraphy, tectonic setting, sedimentation processes, and gold and uranium occurrences within the Witwatersrand deposits, which are fossil placers formed in an ancient freshwater lake. Mining in the region has been ongoing since the late 1800s.
The document discusses three main types of ore forming processes: magmatic, sedimentary, and metamorphic. It focuses on magmatic processes, describing early and late magmatic processes like dissemination, segregation, injection, and residual liquid segregation and injection. Immiscible liquid segregation and injection are also discussed. Pegmatite deposits and contact metasomatic deposits near invading magmas are summarized. A variety of ore deposits can form from these magmatic processes depending on temperature and pressure conditions during crystallization and cooling of magma.
This document discusses coal rank, grade, and type. It provides definitions and classifications for these coal properties.
Coal rank refers to the degree of coalification or thermal maturation of coal, ranging from lignite to anthracite. Coal grade is based on purity and ash content. Coal type is distinguished by the type of plant materials that formed the coal. These properties are independent but can vary spatially. Coal is first classified by rank to determine its utilization. Rank is determined through parameters like carbon content, energy value, and maceral composition that change with the coalification process. Coal plies form a basis for sampling and correlation within a coal seam based on variations in lithotype or partings.
The document discusses various atomic minerals found in India including uranium, thorium, beryllium, and lithium. It provides details on the largest reserves of each mineral by state in India and largest producing countries globally. The major uses of each mineral are also summarized, with uranium and thorium being primarily used for nuclear energy production, beryllium for alloys, and lithium for batteries.
This document discusses various rock drilling methods. It defines rock drilling and lists its objectives such as exploration and production. The document then classifies and describes several drilling methods - auger drilling, reverse circulation drilling, diamond core drilling, air core drilling, jumper bar drilling, jack hammer drilling, churn drilling, direct push rig, hydraulic rotary drilling, and sonic drilling. It provides details on the working principles, advantages, and limitations of each method.
Application of Rare Earth Elements in Geological StudiesSolomon Adeyinka
The document summarizes two seminar presentations and a research study on the applications of rare earth elements in geological studies. It begins with introducing rare earth elements and outlining their classification and geology. It then discusses various applications of rare earth elements in provenance studies, sedimentary processes, petrogenetic modeling, geochronology, and paleoenvironmental reconstruction. Three case studies are presented that apply rare earth element analysis to investigate shale compositions, deduce provenance of clastic sediments, and reconstruct hydrocarbon generation history.
Coal bed methane (CBM) is a form of natural gas extracted from coal beds. It is stored in coal through adsorption and extracted by pumping water from the coal seam to reduce pressure and release the gas. The U.S. has large estimated reserves of over 700 trillion cubic feet of CBM, especially in major coal basins in the Rocky Mountain region. Extraction involves drilling wells into coal seams and pumping out water, which produces large volumes of produced water that require management and can impact soils, plants, and aquatic ecosystems if not properly handled. CBM is now a significant part of the U.S. natural gas supply and India also has potential significant CBM resources in its Gondwana and
Coal bed methane (CBM) is natural gas extracted from coal beds. CBM forms during the coalification process where plant material is transformed into coal over time and buried deeper underground. As coalification progresses, methane gas is generated and stored within the micropores of coal by adsorption. When extracted via wells, water must also be pumped out which can impact local aquifers and water supplies if not properly managed. India has significant CBM reserves that could serve as an energy resource but extraction also carries environmental risks like venting chemicals and impacting air and water quality that require mitigation.
India is the 4th largest producer of manganese ore in the world, with Karnataka and Orissa having some of the largest deposits. Manganese ore occurs in various forms like massive, columnar, fibrous, botryoidal, and granular deposits. It is an important raw material used in steel production and also has various other industrial applications. The key manganese ore producing states in India are Karnataka, Orissa, Maharashtra, and Madhya Pradesh, which have deposits of different types including residual, sedimentary, hydrothermal, and metamorphosed ores.
Coal bed methane is natural gas found stored within coal beds. During the coalification process, organic material under heat and pressure produces volatile substances like methane and water that get trapped in the coal. The methane is stored primarily in the coal matrix and cleat fractures in the coal. To extract coal bed methane, wells are drilled into coal seams and groundwater is pumped out to lower pressure and release methane from the coal matrix and fractures. Estimating methane reserves involves extracting coal cores and measuring gas content or making calculations based on known coal characteristics and feasibility of development. Benefits include developing gas industries, generating government revenue, and utilizing produced water.
Currently, gas demand exceeds supply by 30 per cent. While the demand for natural gas in India is 118 million metric standard cubic meter per day (MMSCMD), the current supply from various sources is 80 MMSCMD, leaving a shortfall of 28 MMSCMD. That deficiency can be covered by CBM production.
study of CBM (Coalbed Methane) production processAsif Aslam
This document discusses coalbed methane (CBM) formation and production. CBM is formed during coalification from either chemical reactions or bacterial action. It is stored in the micropores and macropores (cleats) of coal. CBM production involves three phases - an initial dewatering phase to remove water from the cleats, a stable production phase where gas production increases as water production decreases, and a declining phase where production declines over time. Key factors that influence CBM production are total gas content, coal's sorption capacity, permeability, and diffusion properties.
The document describes the four main stages of mineral exploration:
1) Reconnaissance surveys involve wide-spaced geological mapping and surveys to identify areas for further study.
2) Preliminary exploration uses closer-spaced surveys and sampling to select target areas.
3) General exploration involves detailed mapping, sampling, and shallow drilling of small areas.
4) Detailed exploration uses closely-spaced drilling to determine the precise shape, size, and grade of ore bodies.
Coal bed methane with reference to indiaKiran Padman
Coal bed methane (CBM) refers to natural gas trapped in coal beds. CBM was previously considered a mining hazard but is now seen as a potential energy source. Global CBM production has increased in recent decades in countries like the US, Australia, and China. India has significant estimated CBM reserves of around 70 trillion cubic feet. While CBM development has faced challenges in India, it could help meet the country's growing energy demand and reduce reliance on imports. Enhanced recovery techniques using carbon dioxide injection may further increase CBM production potential in the future.
The document discusses coal bed methane (CBM), which is a gas that occurs in association with coal. CBM is stored in the micropores and fractures of coal. When the water pressure surrounding coal beds is reduced, the methane is able to desorb from the coal and flow to the wells. CBM production involves drilling wells into coal seams and pumping out water to lower pressure and release the trapped methane gas. While CBM is a potential energy source, its extraction can impact local water resources and ecosystems through water withdrawal and produced water management.
COAL MICROLITHOTYPES AND THEIR USAGE IN INTERPRETING DEPOSITION ENVIRONMENTOlusegun Ayobami Olatinpo
This document discusses coal microlithotypes and how their analysis can be used to interpret depositional environments. It defines microlithotypes as natural rock associations found within coal that are differentiated based on maceral percentages. Specific microlithotypes form from different plant communities and depositional conditions. Analyzing the microlithotype composition of coal samples can provide insights into the swamp environment where peat formed, such as forested, reed, or open water settings. This information is valuable for geological research and coal quality evaluation.
COAL BED METHANE (CBM); Coal Seam Gas (CSG), or Coal-mine Methane (CMM); What and why CBM?; How do we estimate the amount of methane gas which will come from a region underlain by coal? ; Benefits of CBM ; Coal seams as aquifers; CBM product water ; What is saline water and why is it considered saline?; What is sodic water and why is it considered sodic? ; Irrigation of crops with CBM water; Current management practices for disposal of CBM product water
Copper is an important metal that has been used for over 10,000 years. It has many important uses such as in construction, electronics, transportation and machinery. Copper is highly conductive and does not corrode easily. The global demand for copper is increasing due to growth in emerging economies but new copper mines are difficult to develop due to challenges such as high costs, environmental opposition and political instability. Copper recycling helps offset this demand and supply imbalance but not completely.
Coal is a fossil fuel formed from the remains of ancient vegetation. Pakistan has large coal reserves, especially in the Thar Desert which contains over 175 billion tonnes. Coal is classified based on its composition and burning characteristics, ranging from peat to anthracite based on carbon and moisture content. Classification systems also consider proximate analysis of fixed carbon, volatile matter, and calorific value. Coal analysis data can be reported on different bases depending on whether the moisture, ash, or mineral matter contents are excluded.
Bauxite types, mineralogy, Indian occurrencesPramoda Raj
The document discusses bauxite, including its mineral composition, locations of deposits, and uses. It notes that bauxite is the primary ore for aluminum production. India has significant bauxite reserves and is the 5th largest producer globally. The document outlines several important bauxite deposits in India, including in the states of Andhra Pradesh, Madhya Pradesh, Bihar, and Maharashtra. These deposits are typically associated with laterite soils and formed from weathering of igneous rocks under tropical conditions.
Coal forms from the sedimentation and metamorphosis of organic matter like plant material over millions of years. There are two main types of coal: sapropelic and humic. Sapropelic coals like boghead coal and cannel coal contain a high percentage of algae. Humic coals include peat, lignite, bituminous coal, sub-bituminous coal, and anthracite - classified based on the degree of metamorphosis from plant material to a harder, more carbon-rich rock. The different coal types are also distinguished by their color, hardness, heating value, and other physical properties.
Ore deposit related to clastic sedimentationPramoda Raj
The document discusses ore deposits related to clastic sedimentation, specifically focusing on placer deposits in the Witwatersrand gold and uranium deposits in South Africa. It describes how weathering processes contributed to mineral resources through various means. It defines different types of placer deposits that form in various environments, such as alluvial, beach, glacial, and fossil placers. It then provides details on the stratigraphy, tectonic setting, sedimentation processes, and gold and uranium occurrences within the Witwatersrand deposits, which are fossil placers formed in an ancient freshwater lake. Mining in the region has been ongoing since the late 1800s.
The document discusses three main types of ore forming processes: magmatic, sedimentary, and metamorphic. It focuses on magmatic processes, describing early and late magmatic processes like dissemination, segregation, injection, and residual liquid segregation and injection. Immiscible liquid segregation and injection are also discussed. Pegmatite deposits and contact metasomatic deposits near invading magmas are summarized. A variety of ore deposits can form from these magmatic processes depending on temperature and pressure conditions during crystallization and cooling of magma.
This document discusses coal rank, grade, and type. It provides definitions and classifications for these coal properties.
Coal rank refers to the degree of coalification or thermal maturation of coal, ranging from lignite to anthracite. Coal grade is based on purity and ash content. Coal type is distinguished by the type of plant materials that formed the coal. These properties are independent but can vary spatially. Coal is first classified by rank to determine its utilization. Rank is determined through parameters like carbon content, energy value, and maceral composition that change with the coalification process. Coal plies form a basis for sampling and correlation within a coal seam based on variations in lithotype or partings.
The document discusses various atomic minerals found in India including uranium, thorium, beryllium, and lithium. It provides details on the largest reserves of each mineral by state in India and largest producing countries globally. The major uses of each mineral are also summarized, with uranium and thorium being primarily used for nuclear energy production, beryllium for alloys, and lithium for batteries.
This document discusses various rock drilling methods. It defines rock drilling and lists its objectives such as exploration and production. The document then classifies and describes several drilling methods - auger drilling, reverse circulation drilling, diamond core drilling, air core drilling, jumper bar drilling, jack hammer drilling, churn drilling, direct push rig, hydraulic rotary drilling, and sonic drilling. It provides details on the working principles, advantages, and limitations of each method.
Application of Rare Earth Elements in Geological StudiesSolomon Adeyinka
The document summarizes two seminar presentations and a research study on the applications of rare earth elements in geological studies. It begins with introducing rare earth elements and outlining their classification and geology. It then discusses various applications of rare earth elements in provenance studies, sedimentary processes, petrogenetic modeling, geochronology, and paleoenvironmental reconstruction. Three case studies are presented that apply rare earth element analysis to investigate shale compositions, deduce provenance of clastic sediments, and reconstruct hydrocarbon generation history.
Coal bed methane (CBM) is a form of natural gas extracted from coal beds. It is stored in coal through adsorption and extracted by pumping water from the coal seam to reduce pressure and release the gas. The U.S. has large estimated reserves of over 700 trillion cubic feet of CBM, especially in major coal basins in the Rocky Mountain region. Extraction involves drilling wells into coal seams and pumping out water, which produces large volumes of produced water that require management and can impact soils, plants, and aquatic ecosystems if not properly handled. CBM is now a significant part of the U.S. natural gas supply and India also has potential significant CBM resources in its Gondwana and
Coal bed methane (CBM) is natural gas extracted from coal beds. CBM forms during the coalification process where plant material is transformed into coal over time and buried deeper underground. As coalification progresses, methane gas is generated and stored within the micropores of coal by adsorption. When extracted via wells, water must also be pumped out which can impact local aquifers and water supplies if not properly managed. India has significant CBM reserves that could serve as an energy resource but extraction also carries environmental risks like venting chemicals and impacting air and water quality that require mitigation.
Coal use in India contributes significantly to water pollution in several ways: (1) Coal ash contains toxic heavy metals that pollute water sources; (2) Coal mining contaminates water with acid mine drainage and heavy metals; (3) Coal-fired power plants place stress on water resources for steam generation and emit pollutants that cause acid rain. A CPCB study found that untreated wastewater from coal mines increases turbidity in rivers and toxic element levels in groundwater. Strict regulations on wastewater treatment and zero discharge are needed to reduce coal's pollution of water resources.
This document provides an analysis of methane drainage from underground coal mines in India. It discusses the objectives and scope of the project, which are to study viable methane drainage methods for Indian mines and perform reservoir modeling, simulation studies, and cost-benefit analyses. The introduction defines coal bed methane and its importance as both a safety and climate issue for the mining industry. Literature review covers the characteristics of methane gas, reservoir properties that should be considered for drainage systems, and methods for measuring coal seam gas content. Key points discussed include methane emissions from longwall mining, basic principles of pre-drainage and post-drainage, and techniques used for in-seam horizontal methane drainage. Case studies of specific Indian mines are also summarized.
The document summarizes Richard Ademola Ogundele's seminar presentation on unconventional reservoirs. It defines unconventional reservoirs as those requiring special recovery operations outside conventional practices. Examples provided include tight gas sands with low permeability, coal-bed methane stored in coal seams, and shale oil extracted from oil shale rock. The case study describes coal-bed methane development in the San Juan Basin of Colorado, where methane is stored adsorbed onto coal surfaces and released by removing water from coal seams. Enhanced recovery methods like injecting carbon dioxide or nitrogen can increase methane production rates and reserves in coal-bed reservoirs. Recent trends show unconventionals like tight gas, shale gas, and coal-bed methane becoming
Coalbed methane exists naturally within coal deposits and can be extracted through drilling wells. As coal is buried deeper underground over time, microbial and thermal processes generate methane that gets stored in the coal. Technology has been developed to safely extract this methane by reducing reservoir pressure and allowing the gas to desorb from the coal. The United States has successfully commercialized coalbed methane extraction through thousands of wells. India also has significant coalbed methane potential across its major coal basins, with initial exploration showing good gas contents. Commercial development of this resource could help meet India's growing natural gas demand and improve energy security.
This document summarizes information about carbon capture and storage (CCS) technology. It discusses how CCS works to capture carbon dioxide at large emission sources like power plants and store it underground. Storage options include geological formations like saline aquifers and depleted oil/gas fields. The document also provides examples of existing CCS projects and discusses concerns about safety and leakage of stored carbon dioxide. It notes that CCS could reduce emissions from power plants by 80-90% but increase costs by 30-60% and that a variety of solutions including CCS, efficiency and renewables will be needed to address climate change.
Kashagan Oil Field - Analysis of Geology, Geophysics and Petroleum SystemAkhil Prabhakar
The Kashagan oil field is the largest oil field discovered in the last 30 years, located in the northern Caspian Sea off Kazakhstan. It contains estimated reserves of 6.4 to 20 billion barrels of oil. However, production has been delayed due to the huge costs involved, environmental concerns with drilling, and reluctance of the Kazakh government to involve foreign oil companies. The field's geology includes carbonate reservoir rocks from the Devonian to Carboniferous periods overlain by Permian salt domes that serve as traps for the oil and gas accumulations.
The Kashagan oil field is the largest oil field discovered in the last 30 years. Located in the northern Caspian Sea near Kazakhstan, it contains estimated reserves of 6.4-20 billion barrels of oil. However, production has not begun yet due to the huge costs involved, environmental concerns with drilling, and reluctance of the Kazakh government to involve foreign oil companies. The field's geology involves carbonate reservoir rocks formed from ancient coral reefs trapped beneath salt dome structures. Significant exploration and changes in ownership of the field have occurred over the years as its development challenges have continued.
This document summarizes key reservoir features of tight sandstones in the Williams Fork formation in the Southern Piceance Basin in Colorado. Gas production comes from 900 feet of continuously gas-saturated, lenticular sandstone reservoirs. Natural fractures control fluid distribution and were formed by overpressuring and basement uplift. Integrated techniques including aerial surveys, basin modeling and 3D seismic can detect fracture zones associated with basement structures to locate development areas.
This document is a project submitted by Dhirendra Pratap Singh for the partial fulfillment of the requirements for a Master's degree in Geology from Vinoba Bhave University, Hazaribag, Jharkhand, India under the guidance of Dr. H. Singh in September 2009. It discusses coalbed methane exploration and exploitation. The key points are:
1. Coalbed methane is natural gas found stored in coal beds. During the coal formation process, large amounts of gas including methane are generated and most remain stored in the coal.
2. The amount of gas stored in a coal bed depends on factors like the coal's rank, depth, thickness, and cleat structure. Most methane
The document discusses new technologies applied to develop tight hydrocarbon reservoirs in the Cambay Basin of India. Specifically, it details the application of horizontal drilling, multistage fracturing, and microseismic monitoring in a well in the Cambay Field. This well is expected to produce 300,000-500,000 m3/d of gas, compared to typical production of 30,000-50,000 m3/d from vertical wells. These new technologies could also be applied in other Indian basins containing tight reservoirs to help meet the country's growing energy demand.
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COAL BED GAS GENERATION
1. COAL BED GAS GENERATION
NARMEEN HAROON
ROLL NO: 12
4TH SEMESTER
CENTRE FOR COAL TECHNOLOGY
UNIVERSITY OF THE PUNJAB
LAHORE.
2. What is Coal Bed Gas ?
Coal bed gas also known as Coal bed methane (
CBM ) is a form of natural gas extracted from coal
beds.
The term refers to methane adsorbed into the solid
matrix of the coal.
Methane is stored within the coal by a process
called adsorption.
It is called 'sweet gas' because of its lack
of hydrogen sulfide.
Coal bed methane contains very little heavier
hydrocarbons.
2COAL BED GAS GENERATION
3. The methane is in a near-
liquid state lining the insides
of the pores within the coal
(called the matrix).
The open fractures in the
coal (called the cleats) can
also contain free gas or can
be saturated with water.
During the extraction, as the
pores shrink, the overall
matrix shrinks as well, which
may eventually increase the
space the gas can travel
through (the cleats),
increasing gas flow.
3COAL BED GAS GENERATION
4. Composition Of CBM
The composition of methane gas from coal
mines is variable but it is essentially a high
concentrated methane gas as shown below:
CH4 = 93 – 99 %
C2 H6 = 0 – 3 %
CO2 = 0 – 4 %
N2 = 2 – 6 %
Hydrogen and Rare gases are present in traces.
5. How CBM is formed
CBM is generated either through
chemical reactions or bacterial action.
Thermogenic Production.
Biogenic Method.
High Rank Coal.
Low Rank Coal.
5COAL BED GAS GENERATION
6. Where does CBM exists?
According to the CBM Association of Alabama, 13% of the
land in the lower 48 United States has some coal under it,
and some of this coal contains methane - either in the form
we know as traditional natural gas or as CBM. According to
the United States Geological Survey, the Rocky Mountain
Region has extensive coal deposits bearing an estimated 30-
58 trillion cubic feet (TCF) of recoverable CBM. While
impressive, this represents only one third of the total 184 TCF
of natural gas in the Rocky Mountain region (Decker, 2001).
Within the Rocky Mountain Region, untapped sources of
CBM exist in the Powder River Basin of Wyoming and
Montana, the Greater Green River Basin of Wyoming,
Colorado, and Utah, the Uinta-Piceance Basin of Colorado
and Utah, and the Raton and San Juan Basins of Colorado
and New Mexico. An estimated 24 TCF of recoverable CBM
resources may lie below the Powder River basin of Montana
and Wyoming (Decker, 2001).
6COAL BED GAS GENERATION
8. How the estimation is done?
There are two popular methods of estimating
recoverable methane gas from a coal seam:-
One method requires estimating methane reserves
by boring to the top of the coal seam, then extracting a
core from the coal.
The amount of methane recovered from the coal core
is used to estimate gas content per unit volume of
coal. If a number of cores are drilled and methane gas
release is observed, one can estimate the amount of
gas available in a region.
The limitations to this method are:
1) there is much disturbance to the coal seam core
before gas release is measured.
2) it is expensive.
8COAL BED GAS GENERATION
9. Another method is through a series of calculations
based on information known about the coal in the
region and the feasibility of CBM development.
For instance, the Montana Bureau of Mines and
Geology estimated the amount of recoverable CBM in
the Powder River Basin using the following information:
A coal seam has favorable reserves if it produces 50-
70 ft3 CBM per ton of coal.
CBM extraction is economical at 50 ft3 per ton of coal
when a coal seam is 20 feet thick or more.
Coal bed methane exists only in areas where the
dominant chemistry of the water in the coal seam is
sodium bicarbonate and where the coal seam is
buried deeply enough to maintain sufficient water
pressure to hold the gas in place.
The Environmental Impact Statement for CBM
development in the Powder River Basin estimated the
amount of coal in the region based on the total reported
tonnage of coal in the region multiplied by 50 ft3 of
methane per ton of coal, regardless of seam thickness,
depth or proximity to outcrop. 9COAL BED GAS GENERATION
10. CBM is removed by removing water
pressure which holds CBM in place.
Methane that was held in place by
water pressure tends to follow the water
as it is pumped to the surface, where it
is captured and transported through
pipelines. Fracturing fluids are often
first injected into the coal bed to break
up the coal, making it easier for the
water and gas to flow to the surface.
How is coal bed methane removed?
10COAL BED GAS GENERATION
12. Since CBM travels with ground water in coal seams, extraction of CBM
involves pumping available water from the seam in order to reduce the
water pressure that holds gas in the seam. CBM has very low solubility
in water and readily separates as pressure decreases, allowing it to be
piped out of the well separately from the water. Water moving from the
coal seam to the well bore encourages gas migration toward the well.
CBM producers try not to dewater the coal seam, but rather seek to
decrease the water pressure (or head of water) in the coal seam to just
above the top of the seam. However, sometimes the water level drops into
the coal seam.
12COAL BED GAS GENERATION
13. Methane will stay in a coalbed as long as the
water table remains above the gas saturated
coal.
Gas is released from the coalbed when cleat
pressure is reduced by dewatering.
Some wells may never become economic if
coals can’t be dewatered
13COAL BED GAS GENERATION
14. Extraction
A steel-encased hole is drilled into the
coal seam (100 – 1500 meters below
ground).
Gas and produced water.
Then the gas is sent to a compressor
station and into natural gas pipelines.
Coal bed methane wells often produce at
lower gas rates than conventional
reservoirs, typically peaking at near
300,000 cubic feet (8,500 m3) per day
(about 0.100 m³/s).
14COAL BED GAS GENERATION
15. Intrinsic Properties Affecting Gas
Production
Gas contained in coal bed methane is
mainly methane and trace quantities
of ethane, nitrogen, carbon
dioxide and few other gases.
Porosity.
Adsorption Capacity.
Fracture Permeability.
Thickness of formation and initial
reservoir pressure.
15COAL BED GAS GENERATION
16. CBM wells are required to be spaced at least 1000 feet apart.
The 1000 feet distance is based on what is called the “cone of
depression.”
Pumping from wells lowers the water table.
This area is known as the cone of depression.
Groundwater flow is diverted towards the well
as it flows into the cone of depression.
16COAL BED GAS GENERATION
17. Fate of CBM product water-
(a) Quantity of CBM product
water
Extraction of CBM involves pumping large
volumes of water from the saturated coal seam in
order to release the water pressure holding the
gas in the coal seam.
CBM product water is a source of much debate.
Each well produces 5 to 20 gallons of water per
minute.
At 12 gallons per minute, one well produces a
total of 17,280 gallons of water per day.
It is common to have one well every 80 acres,
and in the Powder River Basin, there are up to
three methane-bearing coal seams. Therefore,
there may be up to three wells per 80 acres.
17COAL BED GAS GENERATION
18. (b) The quality of CBM product water
and its effects on soil:
CBM product water has a moderately high salinity
hazard and often a very high sodium hazard based on
standards used for irrigation suitability.
Irrigation with water of CBM product water quality on
range or crop lands should be done with great care and
managed closely.
With time, salts from the product water can accumulate
in the root zone to concentrations which will affect plant
growth.
Saline conditions stunt plant growth because plants
must work harder to extract water from the soil.
the production fluid is subjected to pH adjustments and
aeration if necessary and settling. Once the water has
been treated, it can then be discharged.
18COAL BED GAS GENERATION
20. The quality of CBM product water and
its effect on plants:
Disposal of the quantities of CBM
product water into stream channels and
on the landscape poses riparian and
wetland
High salinity and sodium levels in
product water may alter plant
communities by causing replacement of
salt intolerant species with more salt
tolerant species.
It is well recognized that encroachment
of such noxious species as salt cedar,
Russian olive, and leafy spurge is
20COAL BED GAS GENERATION
21. Left: An example of soils of eastern Montana
that are high in swelling (montmorillonitic)
clay.
Right: Complete dispersion of the same
soil following a season of exposure to
high saline/sodic water.
21COAL BED GAS GENERATION
22. The current management practices
for disposal of CBM product water
Discharged into a stream channel - Although direct stream
discharge is no longer permitted on new wells, existing
operations were "grandfathered" and are still discharging directly
into streams. Also, proposals are being advanced to allow regulated
discharges during certain flow conditions.
Impounded - This method involves constructing a pond in which
CBM product water is stored or allowed to infiltrate to the
subsurface. There are several terms for these impoundments:
"holding ponds", "zero discharge ponds" or "infiltration ponds".
Although they do not directly discharge water on the land surface,
most impoundments are not lined and do discharge to the
subsurface. Some percentage of seepage flow from impoundments
is likely to reach stream channels via subsurface flow.
Land applied to crop or rangeland - through some form of
irrigation equipment.
Other uses - CBM product water is also used for dust control and, in
some cases, is being used by coal mines.
22COAL BED GAS GENERATION
23. Areas of Coal Bed Methane
Australia
• Bowen Basin, (Fairview, Scotia, Spring Gully), Queensland, Australia
• Surat Basin, Berwyndale, Windibri, Kogan, Daandine, Tipton West, Queensland, Australia
Canada
• Telkwa coalfield, British Columbia
• Western Canadian Sedimentary Basin, Alberta
South
Africa
• Molteno Coal Field, Eastern Cape
United
Kingdom
• Cheshire, Lancashire, Staffordshire
United
States
• Appalachian Basin, Alabama, Pennsylvania, Ohio, Wyoming , Colorado and New Mexico
23COAL BED GAS GENERATION
24. Reserves
A U.S. Geological Survey predicts more than 700
trillion cubic feet (20 Tm³) of methane within the US.
At a natural gas price of US$6.05 per million Btu
(US$5.73/GJ), that volume is worth US$4.37 trillion.
At least 100 trillion cubic feet (2.8 Tm³) of it is
economically viable to produce.
In Canada, British Columbia is estimated to have
approximately 90 trillion cubic feet (2,500 km3) of
coal bed gas
24COAL BED GAS GENERATION
26. CBM as an Energy Resource
Coal bed Methane Moves from Unconventional to
Mainstream Energy Resource.
Coal bed methane is now a significant part of Nation's
natural gas supply and less methane is released to the
atmosphere.
Currently considered a non-renewable resource
There is evidence by the Alberta Research
Council, Alberta Geological Survey and others showing
coal bed methane is a renewable resource.
26COAL BED GAS GENERATION
27. Environmental Impacts
CBM wells are connected by a network of roads,
pipelines, and compressor stations.
Water withdrawal may depress aquifers over a large
area and affect groundwater flows
The release of CBM into the atmosphere adversely
affects the global climate.
Operators are required to obtain building permits for
roads, pipelines and structures, obtain wastewater
(produced water) discharge permits, and prepare
Environmental Impact Statements.
27COAL BED GAS GENERATION
28. Facts
Coal is the world′s most abundant energy source
Coal is a major source of hydrocarbons such as
methane gas
When plant material is converted into coal it generates
large quantities of methane-rich gas
Methane gas is then stored within the coal beds making
coal a reservoir as well as a gas source
Coal bed methane is currently a huge undeveloped
energy resource
Coal bed methane can be used as an clean energy
source
It is a safe, efficient and an environmentally more
acceptable energy source
Over the last two decades, the development of domestic
natural gas supplies declined while consumption
increased. There is now greater world market demand for
cleaner fuels like Coal Bed Methane Gas and Natural 28COAL BED GAS GENERATION
29. Recommend: Most Sustainable
Practice
Reinjection into aquifers depleted by
CBM production.
Injection or percolation into depleted
aquifers with water treatment as required
protecting and/or enhancing water quality.
Replace other uses where quality allows.
Surface discharges with water treatment
as required resulting in improved stream
flows.
29COAL BED GAS GENERATION