The Tampia Hill gold deposit, is located near the town of Narembeen in the Wheatbelt of Western Australia, 25 km east of Perth. Explaurum held the project from 2014 until the end of 2018 and during this period Kenex provided key services including on-site project management, interpretation of downhole wireline data, building 2D and 3D geological maps, and 3D mineral potential mapping for resource domaining and to help target grade control drilling inside the pit design. Kenex were also involved in the compilation of data over the wider area around Tampia and helping to target exploration using updated geological maps and mineral potential mapping.
Mineral potential mapping as a strategic planning tool in the eastern Lachlan...Kenex Ltd
The Geological Survey of New South Wales (GSNSW) is undertaking a statewide mineral potential mapping project driven by the need to provide justifiable land use planning advice to key government stakeholders and to highlight the exploration potential of the state’s major mineral systems at a regional scale. Following delivery of mineral potential data packages for the Southern New England Orogen in 2017, and the Curnamona Province and Delamerian Thomson Orogen in 2018, the eastern Lachlan Orogen was selected as the next area for a review of key mineral systems and mineral potential. The study area covers the Lachlan Orogen east of the Gilmore Fault and the study mapped the mineral potential for porphyry Cu–Au, polymetallic skarn, Kanimblan orogenic Au, Tabberabberan orogenic Au, and VAMS mineral systems.
The full report and data package can be downloaded from: https://search.geoscience.nsw.gov.au/product/9253
Minning Application and Remote Sensing Using Aster ImageryHrishikesh Satpute
CONTENTS
1. INTRODUCTION
2. MINING SCENARIO IN INDIA
3. ALL ABOUT ‘ASTER’
4. APPLICATIONS OF ASTER
5. REMOTE SENSING IN MINING
6. GIS FOR MINERAL EXPLORATION
7. CASE STUDIES & ANALYSIS
Mineral Potential Mapping for Pre-Competitive Data Delivery in NSW Zone 54Kenex Ltd
This presentation explores the benefits of using all available geosciences data to provide the most reliable basis for exploration decision-making and from which to develop the most appropriate and cost-effective exploration programs.
The Tampia Hill gold deposit, is located near the town of Narembeen in the Wheatbelt of Western Australia, 25 km east of Perth. Explaurum held the project from 2014 until the end of 2018 and during this period Kenex provided key services including on-site project management, interpretation of downhole wireline data, building 2D and 3D geological maps, and 3D mineral potential mapping for resource domaining and to help target grade control drilling inside the pit design. Kenex were also involved in the compilation of data over the wider area around Tampia and helping to target exploration using updated geological maps and mineral potential mapping.
Mineral potential mapping as a strategic planning tool in the eastern Lachlan...Kenex Ltd
The Geological Survey of New South Wales (GSNSW) is undertaking a statewide mineral potential mapping project driven by the need to provide justifiable land use planning advice to key government stakeholders and to highlight the exploration potential of the state’s major mineral systems at a regional scale. Following delivery of mineral potential data packages for the Southern New England Orogen in 2017, and the Curnamona Province and Delamerian Thomson Orogen in 2018, the eastern Lachlan Orogen was selected as the next area for a review of key mineral systems and mineral potential. The study area covers the Lachlan Orogen east of the Gilmore Fault and the study mapped the mineral potential for porphyry Cu–Au, polymetallic skarn, Kanimblan orogenic Au, Tabberabberan orogenic Au, and VAMS mineral systems.
The full report and data package can be downloaded from: https://search.geoscience.nsw.gov.au/product/9253
Minning Application and Remote Sensing Using Aster ImageryHrishikesh Satpute
CONTENTS
1. INTRODUCTION
2. MINING SCENARIO IN INDIA
3. ALL ABOUT ‘ASTER’
4. APPLICATIONS OF ASTER
5. REMOTE SENSING IN MINING
6. GIS FOR MINERAL EXPLORATION
7. CASE STUDIES & ANALYSIS
Mineral Potential Mapping for Pre-Competitive Data Delivery in NSW Zone 54Kenex Ltd
This presentation explores the benefits of using all available geosciences data to provide the most reliable basis for exploration decision-making and from which to develop the most appropriate and cost-effective exploration programs.
Kenex have been working with Duke Exploration in order to develop exploration targets for base and precious metal mineralisation in Australia. We have been involved throughout all stages of the exploration workflow, details of which are provided below. The Bundarra project represents one of the most successful exploration targeting projects that Kenex has been involved with and promises to be even more exciting in the future!
Mineral potential mapping in Bundarra, QueenslandKenex Ltd
The Bundarra porphyry Cu-Au project is held by Duke Exploration Ltd, and is located in central Queensland, Australia, 110 km south-west of Mackay. The project was acquired in 2017. Kenex has completed, for Duke, detailed mineral potential mapping over the project area, in order to focus drilling funds on the most prospective areas.
The project area surrounds the Cretaceous Bundarra Granodiorite, which intrudes the Permian Back Creek Group carbonaceous shales, sandstones and marls. Numerous Cu-Au occurrences are present within or near the hornfelsed contact aureole of the granodiorite. The project has been subject to significant exploration work, including mining of high-grade ore shoots in the late 1800s to early 1900s, however, modern exploration has been sporadic, and without comprehensive follow-up of encouraging results.
All available historic data has been compiled and incorporated into a mineral potential map based on the porphyry mineral system. Maps representing all components of the porphyry mineral system including source, transport, trap and deposition have been created, resulting in binary maps which show where each characteristic is present or absent. These are then compared to known mineral occurrences, or training points. The weights of evidence technique was used for the modelling. This technique calculates the relationship of the area covered by the characteristic being tested and the number of training data points that fall within that area. For each map a contrast value ‘C’ gives a relative measure of the strength of the correlation, and a Studentised contrast value ‘StudC’ gives a relative measure of the reliability of the C value, i.e. a high C and StudC value implies a strong spatial correlation and a reliable result, which occurs when more training points are captured within a smaller area.
The maps with the best spatial correlation to the training points for each mineral system component were selected for the final mineral potential model. Table 1 shows the eight spatial variables which were selected from a total of 60 mapped.
Introduction to the petroleum system of Niger Delta Province. Geological aspects, small statistical data analysis to evaluate the general reservoir properties, oil chemical features.
CRISTIANO ASCOLANI, PHILIPP MESTERS, JEAN-MARC SÖLDNER.
Ruhr-Universität Bochum, Petroleum Geology I, Summer Semester 2014.
Reservoir analysis based on:
1) AMIGUN, John Olurotimi, and Oluwaseyi Ayokunle ODOLE. "Petrophysical Properties Evaluation for Reservoir Characterisation of SEYI Oil Field (Niger-Delta)." International Journal of Innovation and Applied Studies 3.3 (2013): 765-773.
2) Chiaghanam, O. I., et al. "Reservoir Characterisation Of Konga Field, Onshore Niger Delta, Southern Nigeria." International Journal of Science & Emerging Technologies 3.1 (2012).
3)Aigbedion, I., and S. E. Iyayi. "Formation Evaluation of Oshioka Field Using Geophysical Well Logs." Middle-East Journal of Scientific Research 2.4 (2007): 107-110.
4) Adewoye, O., et al. "Petrophysical and structural analysis of maiti field, Niger Delta, using well logs and 3-D seismic data." Petroleum & Coal 55.4 (2013): 302-310.
5) Ogbe, Ovie Benjamin, Opatola, Olatunji Abraham, Idjerhe Wilson and Ocheli Azuka. "Reservoir Quality Evaluation of Sand Bodies of K-Field, Onshore Niger Delta, Using Wireline Logs". International Journal for Science and Emerging Technologies with Latest Trends” 13.1 (2013): 46-64.
Terra is a listed company, which was founded in 2005, although the science that Terra uses goes back more than 35 years. Terra has over 500 years of Geotechnical, Exploration, Development, and Production combined experience.
Terra is represented in Indonesia by: PT. Indonesia – International Energy/Exploration Solution Partners which is a registered Indonesian owned company.
Terra is a powerful exploration solution that significantly improves the exploration success rate, reduces time from years to months, and when incorporated into a project, reduces wasteful spending on expensive seismic and drilling into non-prospective areas.
The Terra technologies address such challenges as:
* Large area high-grading and low-grading;
* Lack of subsurface data;
* Complex geology;
* Stratigraphic plays where seismic is not effective
* Lack, absence or poor quality of seismic data;
* Detection of subsurface structures, identifying high quality prospects which merit further exploration work and in many cases the presence of hydrocarbons and
minerals;
In General, the Terra technologies are superior tools for:
* Generating prospects in under-explored areas;
* Remotely or noninvasively delineate hydrocarbon and mineral anomalies and structures;
Assessing polymetallic nodule deposit in the Cook Island EEZKenex Ltd
With the use of GIS and geostatistical modelling techniques, we helped the Cook Island Seabed Authority to assess the potential for economic deposits of polymetallic nodule in their exclusive economic zone.
Assesment of groundwater_potential_zones_for_bruhat_bangalore_mahanagara_pali...Mohammed Badiuddin Parvez
Groundwater is an important natural resource in present day, but of limited use due to frequent failures in monsoon, undependable surface water, and rapid urbanization and industrialization have created a major threat to this valuable resource. The present work is an attempt to integrate RS and GIS based analysis and methodology in groundwater potential zone identification in the BBMP study area with an aerial extent of 715.95 km2. By Mohammed Badiuddin Parvez
2015 broken hill resources investment symposium rosemary hegartySymposium
"educing exploration risk along covered Curnamona margins: experiences from the Southern Thomson Orogen Collaborative Project."
Rosemary Hegarty, Senior Geophysicist, Geological Survey of New South Wales.
Technical presentation at 2015 Broken Hill Resources Investment symposium.
Kenex have been working with Duke Exploration in order to develop exploration targets for base and precious metal mineralisation in Australia. We have been involved throughout all stages of the exploration workflow, details of which are provided below. The Bundarra project represents one of the most successful exploration targeting projects that Kenex has been involved with and promises to be even more exciting in the future!
Mineral potential mapping in Bundarra, QueenslandKenex Ltd
The Bundarra porphyry Cu-Au project is held by Duke Exploration Ltd, and is located in central Queensland, Australia, 110 km south-west of Mackay. The project was acquired in 2017. Kenex has completed, for Duke, detailed mineral potential mapping over the project area, in order to focus drilling funds on the most prospective areas.
The project area surrounds the Cretaceous Bundarra Granodiorite, which intrudes the Permian Back Creek Group carbonaceous shales, sandstones and marls. Numerous Cu-Au occurrences are present within or near the hornfelsed contact aureole of the granodiorite. The project has been subject to significant exploration work, including mining of high-grade ore shoots in the late 1800s to early 1900s, however, modern exploration has been sporadic, and without comprehensive follow-up of encouraging results.
All available historic data has been compiled and incorporated into a mineral potential map based on the porphyry mineral system. Maps representing all components of the porphyry mineral system including source, transport, trap and deposition have been created, resulting in binary maps which show where each characteristic is present or absent. These are then compared to known mineral occurrences, or training points. The weights of evidence technique was used for the modelling. This technique calculates the relationship of the area covered by the characteristic being tested and the number of training data points that fall within that area. For each map a contrast value ‘C’ gives a relative measure of the strength of the correlation, and a Studentised contrast value ‘StudC’ gives a relative measure of the reliability of the C value, i.e. a high C and StudC value implies a strong spatial correlation and a reliable result, which occurs when more training points are captured within a smaller area.
The maps with the best spatial correlation to the training points for each mineral system component were selected for the final mineral potential model. Table 1 shows the eight spatial variables which were selected from a total of 60 mapped.
Introduction to the petroleum system of Niger Delta Province. Geological aspects, small statistical data analysis to evaluate the general reservoir properties, oil chemical features.
CRISTIANO ASCOLANI, PHILIPP MESTERS, JEAN-MARC SÖLDNER.
Ruhr-Universität Bochum, Petroleum Geology I, Summer Semester 2014.
Reservoir analysis based on:
1) AMIGUN, John Olurotimi, and Oluwaseyi Ayokunle ODOLE. "Petrophysical Properties Evaluation for Reservoir Characterisation of SEYI Oil Field (Niger-Delta)." International Journal of Innovation and Applied Studies 3.3 (2013): 765-773.
2) Chiaghanam, O. I., et al. "Reservoir Characterisation Of Konga Field, Onshore Niger Delta, Southern Nigeria." International Journal of Science & Emerging Technologies 3.1 (2012).
3)Aigbedion, I., and S. E. Iyayi. "Formation Evaluation of Oshioka Field Using Geophysical Well Logs." Middle-East Journal of Scientific Research 2.4 (2007): 107-110.
4) Adewoye, O., et al. "Petrophysical and structural analysis of maiti field, Niger Delta, using well logs and 3-D seismic data." Petroleum & Coal 55.4 (2013): 302-310.
5) Ogbe, Ovie Benjamin, Opatola, Olatunji Abraham, Idjerhe Wilson and Ocheli Azuka. "Reservoir Quality Evaluation of Sand Bodies of K-Field, Onshore Niger Delta, Using Wireline Logs". International Journal for Science and Emerging Technologies with Latest Trends” 13.1 (2013): 46-64.
Terra is a listed company, which was founded in 2005, although the science that Terra uses goes back more than 35 years. Terra has over 500 years of Geotechnical, Exploration, Development, and Production combined experience.
Terra is represented in Indonesia by: PT. Indonesia – International Energy/Exploration Solution Partners which is a registered Indonesian owned company.
Terra is a powerful exploration solution that significantly improves the exploration success rate, reduces time from years to months, and when incorporated into a project, reduces wasteful spending on expensive seismic and drilling into non-prospective areas.
The Terra technologies address such challenges as:
* Large area high-grading and low-grading;
* Lack of subsurface data;
* Complex geology;
* Stratigraphic plays where seismic is not effective
* Lack, absence or poor quality of seismic data;
* Detection of subsurface structures, identifying high quality prospects which merit further exploration work and in many cases the presence of hydrocarbons and
minerals;
In General, the Terra technologies are superior tools for:
* Generating prospects in under-explored areas;
* Remotely or noninvasively delineate hydrocarbon and mineral anomalies and structures;
Assessing polymetallic nodule deposit in the Cook Island EEZKenex Ltd
With the use of GIS and geostatistical modelling techniques, we helped the Cook Island Seabed Authority to assess the potential for economic deposits of polymetallic nodule in their exclusive economic zone.
Assesment of groundwater_potential_zones_for_bruhat_bangalore_mahanagara_pali...Mohammed Badiuddin Parvez
Groundwater is an important natural resource in present day, but of limited use due to frequent failures in monsoon, undependable surface water, and rapid urbanization and industrialization have created a major threat to this valuable resource. The present work is an attempt to integrate RS and GIS based analysis and methodology in groundwater potential zone identification in the BBMP study area with an aerial extent of 715.95 km2. By Mohammed Badiuddin Parvez
2015 broken hill resources investment symposium rosemary hegartySymposium
"educing exploration risk along covered Curnamona margins: experiences from the Southern Thomson Orogen Collaborative Project."
Rosemary Hegarty, Senior Geophysicist, Geological Survey of New South Wales.
Technical presentation at 2015 Broken Hill Resources Investment symposium.
The prolific Niger Delta Basin is a mature petroleum province. Therefore, further prospectivity in
the basin lies within deeper plays which are high pressure and high temperature (HPHT) targets. One of the
main characteristics of the Niger Delta is its unique diachronous tripartite stratigraphy. Its gross onshore and
shallow offshore lithostratigraphy consists of the deep-seated Akata Formation and is virtually exclusively
shale, the petroliferous paralic Agbada Formation in which sand/shale proportion systematically increases
upward, and at the top the Benin Formation composed almost exclusively of sand. This stratigraphic pattern is
not exactly replicated in the deep offshore part of the delta.
Benham rise – the rising star of philippine resources Fernando Penarroyo
The inclusion of the previously unexplored Benham Rise into Philippine waters has stirred public interest as to the resources potential of this jurisdictional region.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Integrated Geophysical Studies Over Parts of Central Cross River State for th...iosrjce
A total of 71 Vertical Electrical Soundings were carried out using Schlumberger electrode
configuration for the evaluation of groundwater potential in parts of central Cross River State, Nigeria.
Interpretation of data showed three to six geoelectric layers. Productive shallow and deep aquifer zones were
identified at depths of 60 m and 150 m respectively, corresponding to a resistivity range of 100-500 Ωm for
shallow aquifers and 1000-2500 Ωm for deep aquifers respectively. The lithologic data of the aquifers revealed
sand/sandstone and very coarsed grained sand/fractured basement, respectively. Seismic refraction survey was
also carried out within the same study area for the foundation study of rocks. The studies revealed an average
thickness of 4.5 m (probably sand/clay) and 10.0 m (probably gravelly sand/shale) for the first and second
layers respectively. The range of velocities for the first three layers are 602 m/s to 960 m/s, 378 m/s to 2,424 m/s
and 1,587 m/s to 5,368 m/s, respectively, indicating that the soils in the area are not homogeneous. It is inferred
from the relative high values of calculated elastic constants in most of the locations, that the soils are well
consolidated and as such suitable for large engineering construction in such locations, while in the rest of the
locations the soils are considered unconsolidated and unsuitable for large construction work due to the relative
low values of the elastic constants.
Subsurface Sedimentary Thickness and Structural types of Formations in Imo St...IIJSRJournal
Imo State is part of the Niger Delta of Nigeria that is blessed with a lot of natural resources. These have not been fully exploited and subsurface information of the region is needed to enhance the exploration of these resources. In this work airborne gravity data obtained from the Nigerian Geological Survey Agency has been interpreted to obtain information on the structural types, sedimentary thickness and hydrocarbon potentials of the state. These were archived by use of Oasis Montaj software. The residual gravity anomaly was first extracted from the field data with a polynomial operation and then enhanced by a high pass filter before gridding, modelling and depth estimation, using inverse and forward modelling and Euler deconvolution operation. The results reveal syncline and anticline structures with strike angles of varying degrees and strike-slip faults. The depth to evaluated anomalous bodies was between 4,001 m and 9,439 m, all located in the Ameki and Imo Formations which are composed of sandstones and shales. The structures and formations they occur are favorable environments for hydrocarbon habitation as is common in the Niger delta basin. The Euler depth estimates gave sedimentary thickness ranges of 113.5 m to 8,717 m and falls within basement depths in the Niger Delta
Investors have been avoiding the Okurike Barite due to paucity of
information on its economic worth in spite of the high demand for barites by the
local industries. This study was embarked upon to determine the spread and
industrial quality of the barite deposit in order to bridge the information gap. The
Okurike Barite mineralised site was investigated using geophysical Vertical
Electrical Sounding (VES) and Electrical Resistivity Tomography (ERT) and
geological techniques. The geophysical data were acquired along three profiles
while the barite samples were analysed using the laboratory techniques in order to
determine their elemental compositions and physical characteristics. Results show
that the barites occur with gravels, breccias and weathered basement materials
within a very limited region. The resistivity values of the barite mineralised region
were observed to vary between 731 and ~1500 Ωm. The barites are characterised by
specific gravity of 4.4, density of 3.64 g/cm3, porosity of 28%, uniaxial compressive
strength of 29.4 kN/mm2 and water absorption capacity of 1.5%. The elements Ba
and Fe dominate the elemental composition with 77.28 and 19.98% respectively.
BaO, Fe2O3 and MnO are preferentially enriched with abundance of 71.28, 21.40
and 6.10% respectively. These results show that the industrial quality of the
Okurike Barite is high although its spread is limited.
Basin intelligence for informative and strategic decision making and analysis.
With TGS Analytics, you gain deep basin intelligence for informative and strategic decision making along the project value chain. Our basin intelligence solution provides analytical partnerships to close any research gaps so you can make better informed decisions.
We differentiate our solution by bridging the gap between subsurface geologic data and interpretation with strategic analysis of production capabilities. Staying connected to the data allows for fast and transparent insights from a top-down view to each individual well.
Our tool integrates into your workflow allowing you to gain quick knowledge or perform individual analytics for your AOI.
As Europe's leading economic powerhouse and the fourth-largest hashtag#economy globally, Germany stands at the forefront of innovation and industrial might. Renowned for its precision engineering and high-tech sectors, Germany's economic structure is heavily supported by a robust service industry, accounting for approximately 68% of its GDP. This economic clout and strategic geopolitical stance position Germany as a focal point in the global cyber threat landscape.
In the face of escalating global tensions, particularly those emanating from geopolitical disputes with nations like hashtag#Russia and hashtag#China, hashtag#Germany has witnessed a significant uptick in targeted cyber operations. Our analysis indicates a marked increase in hashtag#cyberattack sophistication aimed at critical infrastructure and key industrial sectors. These attacks range from ransomware campaigns to hashtag#AdvancedPersistentThreats (hashtag#APTs), threatening national security and business integrity.
🔑 Key findings include:
🔍 Increased frequency and complexity of cyber threats.
🔍 Escalation of state-sponsored and criminally motivated cyber operations.
🔍 Active dark web exchanges of malicious tools and tactics.
Our comprehensive report delves into these challenges, using a blend of open-source and proprietary data collection techniques. By monitoring activity on critical networks and analyzing attack patterns, our team provides a detailed overview of the threats facing German entities.
This report aims to equip stakeholders across public and private sectors with the knowledge to enhance their defensive strategies, reduce exposure to cyber risks, and reinforce Germany's resilience against cyber threats.
Adjusting primitives for graph : SHORT REPORT / NOTESSubhajit Sahu
Graph algorithms, like PageRank Compressed Sparse Row (CSR) is an adjacency-list based graph representation that is
Multiply with different modes (map)
1. Performance of sequential execution based vs OpenMP based vector multiply.
2. Comparing various launch configs for CUDA based vector multiply.
Sum with different storage types (reduce)
1. Performance of vector element sum using float vs bfloat16 as the storage type.
Sum with different modes (reduce)
1. Performance of sequential execution based vs OpenMP based vector element sum.
2. Performance of memcpy vs in-place based CUDA based vector element sum.
3. Comparing various launch configs for CUDA based vector element sum (memcpy).
4. Comparing various launch configs for CUDA based vector element sum (in-place).
Sum with in-place strategies of CUDA mode (reduce)
1. Comparing various launch configs for CUDA based vector element sum (in-place).
Data Centers - Striving Within A Narrow Range - Research Report - MCG - May 2...pchutichetpong
M Capital Group (“MCG”) expects to see demand and the changing evolution of supply, facilitated through institutional investment rotation out of offices and into work from home (“WFH”), while the ever-expanding need for data storage as global internet usage expands, with experts predicting 5.3 billion users by 2023. These market factors will be underpinned by technological changes, such as progressing cloud services and edge sites, allowing the industry to see strong expected annual growth of 13% over the next 4 years.
Whilst competitive headwinds remain, represented through the recent second bankruptcy filing of Sungard, which blames “COVID-19 and other macroeconomic trends including delayed customer spending decisions, insourcing and reductions in IT spending, energy inflation and reduction in demand for certain services”, the industry has seen key adjustments, where MCG believes that engineering cost management and technological innovation will be paramount to success.
MCG reports that the more favorable market conditions expected over the next few years, helped by the winding down of pandemic restrictions and a hybrid working environment will be driving market momentum forward. The continuous injection of capital by alternative investment firms, as well as the growing infrastructural investment from cloud service providers and social media companies, whose revenues are expected to grow over 3.6x larger by value in 2026, will likely help propel center provision and innovation. These factors paint a promising picture for the industry players that offset rising input costs and adapt to new technologies.
According to M Capital Group: “Specifically, the long-term cost-saving opportunities available from the rise of remote managing will likely aid value growth for the industry. Through margin optimization and further availability of capital for reinvestment, strong players will maintain their competitive foothold, while weaker players exit the market to balance supply and demand.”
Levelwise PageRank with Loop-Based Dead End Handling Strategy : SHORT REPORT ...Subhajit Sahu
Abstract — Levelwise PageRank is an alternative method of PageRank computation which decomposes the input graph into a directed acyclic block-graph of strongly connected components, and processes them in topological order, one level at a time. This enables calculation for ranks in a distributed fashion without per-iteration communication, unlike the standard method where all vertices are processed in each iteration. It however comes with a precondition of the absence of dead ends in the input graph. Here, the native non-distributed performance of Levelwise PageRank was compared against Monolithic PageRank on a CPU as well as a GPU. To ensure a fair comparison, Monolithic PageRank was also performed on a graph where vertices were split by components. Results indicate that Levelwise PageRank is about as fast as Monolithic PageRank on the CPU, but quite a bit slower on the GPU. Slowdown on the GPU is likely caused by a large submission of small workloads, and expected to be non-issue when the computation is performed on massive graphs.
Techniques to optimize the pagerank algorithm usually fall in two categories. One is to try reducing the work per iteration, and the other is to try reducing the number of iterations. These goals are often at odds with one another. Skipping computation on vertices which have already converged has the potential to save iteration time. Skipping in-identical vertices, with the same in-links, helps reduce duplicate computations and thus could help reduce iteration time. Road networks often have chains which can be short-circuited before pagerank computation to improve performance. Final ranks of chain nodes can be easily calculated. This could reduce both the iteration time, and the number of iterations. If a graph has no dangling nodes, pagerank of each strongly connected component can be computed in topological order. This could help reduce the iteration time, no. of iterations, and also enable multi-iteration concurrency in pagerank computation. The combination of all of the above methods is the STICD algorithm. [sticd] For dynamic graphs, unchanged components whose ranks are unaffected can be skipped altogether.
2. See the energy at TGS.com
Content may not reflect National Geographic's current map policy. Sources: National Geographic, Esri, DeLorme, HERE, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN,
3°E2°E1°E0°1°W2°W3°W4°W5°W6°W7°W8°W9°W10°W11°W12°W13°W14°W15°W
The West African transform margin (WATM) stretches from Sierra Leone
in the west to Benin in the east. What was once frontier territory for
oil and gas exploration has had some of the most exciting discoveries
in recent years. The discovery of the Jubilee field offshore Ghana in
2007 and the Venus (2009) and Mercury (2010) wells in Sierra Leone
suggested the presence of an active hydrocarbon system that could
extend approximately 2,100 km. Since then subsequent wells have been
in drilled in Liberia, Ghana is producing oil and in 2012 Sierra Leone held
a successful bid round for its remaining offshore blocks.
The transform margin was formed by strike-slip movement between two
tectonic plates. Paleotectonic plate movements indicate that the geology
of the region could be analogous to the highly prolific regions of South
America from the early to mid Cretaceous during the early phase of the
opening of the Atlantic. The possibility that West Africa could hold the
same reserves as South America is worthy of further investigation.
The area is structurally complex with multiple areas of hydrocarbon
potential. Early exploration on the shelf included targeted structural
plays. Recently hydrocarbon exploration has focused on the Upper
Cretaceous channel systems found in the deeper waters.
TGS has over a decade of experience in the West Africa transform margin
- including 2D regional programs that have seismic, gravity and magnetic
data. Utilizing these different data allows the explorationist to rapidly
assess the geology, structures and thermal maturation of the margin.
This regional understanding enables geologists to quickly focus on areas
of prime potential and maximum interest. Working with block holders,
TGS has acquired 3D seismic data to complement the 2D regional data.
Sierra Leone and Liberia
The initial exploration of the offshore potential of Sierra Leone and Liberia
occurred in the 1970s and 1980s when a total of nine wells were drilled.
All of them were abandoned although oil shows were encountered in six
wells. Deep water economics was one of the reasons for the cessation
of exploration. In 2009 the Venus well was drilled offshore Sierra Leone
and encountered nearly 14 meters net of hydrocarbon pay in upper
Cretaceous deep water fan sands. This discovery was the first test of
the deep water Sierra Leone - Liberia Basin and its success generated
substantial industry interest in Sierra Leone and the WATM. Appraisal
drilling offshore Sierra Leone and Liberia continues.
Well Data
2D Seismic Surveys
Aeromag Surveys Available
3D Seismic Surveys
4. See the energy at TGS.com
Harper Basin bid round
The future bid round will include blocks 1, 2, 3, 4, 5, 29 and 30. These blocks
are part of the Harper Basin which is formed by the faulted southern margin
of the Liberian High and the intersection of the St. Paul fracture zone. There
is 5,272 km of 2D Geophysical data available over these blocks.
These data have been extensively interpreted and multiple prospects
identified. Whilst the 2D data is beneficial in understanding the geology of
the region to fully understand the complex prospects the benefits of 3D
data cannot be under estimated. As such TGS has completed acquisition of
Sunfish, 6,176 km² of 3D seismic data that will provide excellent coverage of
the source prone, syn- and early post-rift sequences plus the associated and
younger slope and basin floor fan reservoirs. The project will be available
ahead of the bid round opening. The Harper Basin has the potential to be
a world class hydrocarbon province and Sunfish will be an essential tool to
understanding this basin.
Sierra Leone infill 2D
Sierra Leone Infill 2D SL13 is a new 2D multi-client project that
complements the existing data set by completing coverage of all offshore
blocks in Sierra Leone and tying three major offshore discoveries (Mercury,
Venus, and Jupiter). The 9,832 km of data has been processed through pre-
stack time migration and pre-stack depth migration and is now available
for review. The data library has been further expanded by the addition of
approximately 24,000² km of aeromagnetic data (SLAM13). The high quality
data sets are available to license in preparation for the future bid round.
Sierra Leone 3D
TGS has recently acquired a 3D multi-client survey offshore Sierra Leone.
The survey Sierra Leone Block 4A Extension, will add 1,000 km² of new data
to the existing 6,284 km² of 3D data library. This survey extends the current
data coverage in an important and prospective area.
Ghana PSTM
5. See the energy at TGS.com
Benin PSTM 2D
Ghana, Togo and Benin
In the 1970’s, in Ghana Togo and Benin, as in Sierra Leone and Liberia,
exploration was mainly focused on Tertiary plays in the shallow water. That
changed in 2007 with the drilling of the Mahogany well that targeted deep
water Upper Cretaceous fan plays and marked the discovery of the Jubilee
field. Appraisal of Greater Tweneboa, Southeastern Jubilee and West Cape
Three Points continues and there have been discoveries in these prospects.
TGS acquired data in this area in multiple phases. The first program was
acquired in 2004. The 5,040 km regional 2D seismic, gravity and magnetic
program tied the wells that were available. In 2008, TGS acquired an
additional 17,441 km of seismic, gravity and magnetic data. In Benin,
the data were extended to deeper waters of approximately 4,500 m and
interpreted. These data have successfully imaged the continental-oceanic
crust boundaries and the Moho. In 2011, TGS started the acquisition and
processing of 4,100 km2
of 3D data in Benin (blocks 5 and 6). The data library
has been further expanded by the addition of 2,022 km² of 3D data over
blocks 7 and 8.
2D regional line showing basement
