It describes information about field development

1. Good day. I am Aytan Nabiyeva. Let's start the field development project with the geology part. First of all,
I’d like to give you an overview of X field and Central Graben, Next, I’ll focus on nearby field analysis, and
then, we’ll consider structural and stratigraphic configuration. In this project we will describe
development of X field by Xenon limited company. Without further ado, let’s jump to the information
about X field and Central Graben. Most of the oil and gas fields beneath the Central North Sea of the UK
Continental Shelf are in the province known as the Central Graben. More precisely, it is located in block
22/12 about 210 km east northeast of island Britain. The geology of the X-field is examined by using
geophysical information from wireline logs, core samples, and two-dimensional seismic cross sections of
the reservoir from introduced brief overview file.
The hydrocarbons deposited in the North Sea Graben, were found to consist of shale sediments that
emerged during the geological period between the Late Jurassic and early Cretaceous ages. HC have been
deposited within Mandal formation shale where TOC amount is less than 12 percentage. It corresponds
to the Upper Kimmeridge Clay zone. Migratory patterns are affected by Zechstein Lithological Group.
Coming to Central Graben's geological history, it may be subdivided into three rifting phases. Further
information about geological eras is in appendix 1 section.
• Pre-rift (aperture between late Triassic and early Jurassic)
• Syn-rift (aperture between late Jurassic and early Cretaceous)
• Post-rift (aperture between late Cretaceous and Palaeocene)
Nearby field analysis
In order to obtain comprehensive and detailed understanding about X field as well as to predict future
performance we need nearby field analysis. This analysis should be based on geological and depositional
features, such as water depth, age, source rock and seal. We investigated and came up with a decision
that Fulmar, Clyde, Curlew and Auk field. Our criteria is Jurassic reservoir rock, Kimmeridge clay source
rock , water depth 81 m.
why Fulmar? - it has water depth of 81 m which is close to X-field and it has a Late Jurassic dome-shaped
configuration, and the field in the UK sector of the Central North Sea has a recoverable oil reserve of 68
MMm3. Also, The Kimmeridge Clay Formation shales which is rich in TOC, comprise the seal in the south
and west and are covered uniformly by the Fulmar Formation sandstones and reservoir is sealed by Upper
Cretaceous chalk.
In Clyde field, reservoirs comprise Fulmar shallow marine sandstones dated back to Late Jurassic. Late
Jurassic Kimmeridge clay provides better trap for oil migration. Its permeability range between 1 mD and
1 D
Due to faulty system in Curlew field, it has different range of reservoir ages, such as upper Jurassic, late
Jurassic, early cretaceous and late cretaceous/ tertiary reservoir rock.
Seismic Data- Coming to seismic data, it needs to be examined and interpreted to have a better
understanding of the stratigraphy and field structure. Despite the poor quality of the data, it is clear that
the reservoir has an anticline structure. Clearly from picture, primary producing reservoir sand is thick and
continuous (brown), but Ribble sand is thinner and discontinuous (blue). Existence of Ribble and main
sand, as well as geographical distribution and timing of deposition confirms that the field is similar to
Fulmar field which means in the need of incomplete data, Fulmar’s figures can be applied.

2. Depositional environment and Analyses - Identifying depositional environment and facies is
highly crucial in order to understand continuity of reservoir rock units in vertical and lateral
direction. The following findings on lithology and the existence of geological features are
based on core photo analysis. X-field is located in shallow marine environment regarding
following factors:
Existence of bioturbation and lamination
Fulmar field is deposited in shallow marine environmental section
Density & CNL log data indicates increase in porosity as well as GR data shows
coarsening-upward trend
One of the main reasons for X-field to have good reservoir quality as well as lateral sand
continuity is to be placed in shallow marine environments.
Reservoirs created in shallow marine environments often have good reservoir quality and
lateral sand continuity, which is also true for X-field.
 Grains are 𝒎𝒐𝒅𝒆𝒓𝒂𝒕𝒆 𝒕𝒐 𝒘𝒆𝒍𝒍 − 𝒔𝒐𝒓𝒕𝒆𝒅 and 𝒇𝒊𝒏𝒆 𝒕𝒐 𝒎𝒆𝒅𝒊𝒖𝒎 − 𝒔𝒊𝒛𝒆𝒅.
 The color of formation is altering from 𝒈𝒓𝒆𝒚 𝒕𝒐 𝒃𝒓𝒐𝒘𝒏.
 The principal sedimentary structures that happened during the process of rock generation are the
𝒍𝒐𝒘 𝒂𝒏𝒈𝒍𝒆 𝒍𝒂𝒎𝒊𝒏𝒂𝒕𝒊𝒐𝒏𝒔 which primarily show low energy environment.
 The secondary sedimentary structures that happened after the process of rock generation are
𝒃𝒊𝒐𝒕𝒖𝒓𝒃𝒂𝒕𝒊𝒐𝒏, 𝒔𝒍𝒖𝒎𝒑𝒔 𝒂𝒏𝒅 𝒎𝒖𝒅 𝒄𝒍𝒂𝒔𝒕𝒔 that most probably created by storm waves which
primarily shows marine environment.
 Depositional environment is considered as being shallow marine environment relied on
discoveries sourced by core samples and features of analog Fulmar field;
SAFETY culture a bax memmedin atdigi linki reference qoy hse den

3. Let’s continue with HSE part. Due to limited time, I will only cover North Sea and UK policy, oil
and gas waste regulation, duties and noise pollution. Major investments in the last 25 years have
led to the development of a very dense offshore industry in the North Sea region. The Paris
Commission and International Conferences on the Preservation of the North Sea set international
environmental policy guidelines for this kind of operation. North Sea policy is governed by the
Minister of Transport, Public Works, and Water Management. Additionally, its strategy covers 3
concepts, namely healthy sea, safe sea and profitable sea. First perception deals with water quality
and biodiversity, 2nd
one cares about safe and efficient shipping, last one is about economical
interest.
Turn to the UK policy, it plays active role in developing regulations to ensure the safe drilling and
extraction of offshore resources. Main legislation governing the exploration and production of oil
and gas in UK is PetroleumAct 1988. It is an act to consolidate the law relating to import, transport,
storage, refining and blending of petroleum. Further acts, oil and gas legislations can be attained
in HSE Appendix.
Regulaiton of oil and gas waste- Statistics say there are more than 600 offshore oil and gas facilities
in the North Sea, of which 470 are in UK waters. During the extraction of hydrocarbons,
radioactive materials collected in containers at the facility are transported to the surface.
Radioactive Substances Act and State Environmental Policy Act are responsible authority for safe
return of these materials to nature.
Coming to the Employees and Empoyers duties, Regardless of the area, there are risks that will
cause accidents in all workplaces, although it may seem small, it has the potential to cause very
bad accidents with what they call the domino effect. in order to avoid all possible risk, employees
and employers have their own responsibility, detailed information is given in the slide.
Let’s discuss Noise pollution, not all sound is considered noise pollution World Health
Organization defines noise above 65 decibels as noise pollution. More precise information is
illustrated in this colorful table. The visible side of the iceberg is noise effect on humans, but the
invisible side is the underwater creatures that are subject to anthropogenic noise effects. Workers
can be protected by more advanced equipment, ear plug, or noise absorber room and so on. Coming
to the marine animals, they are very sensitive to any pulse coming from seismic activity, oil and
gas exploration, it can directly cause short term and long term problems such as behavioral and
tissue damage.