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Sakhalin 2021
- Conference date: October 5-7, 2021
- Location: Online
- Published: 05 October 2021
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4D 2018y Seismic Interpretation in Lunskoye Field (Sea of Okhotsk, Sakhalin Region, Russia)
By M. PetrovaSummaryThis presentation aims to summaries preliminary results of the time-lapse seismic (4D) as acquired using Ocean bottom nodes technic (OBN) in 2018 for the Lunskoye field offshore Sakhalin Island.
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The Composition and Petroleum Generation Characteristics of The Organic Matter in Rocks from Outcrops in The Southern Part of Sakhalin Island (for Stratigraphic Analogs of The Pilskaya Formation)
Authors E.A. Leushina, A.V. Levin, E.V. Kozlova, T. E. Shkutina and M.Yu. SpasennykhSummaryThe analysis of the organic matter of the Upper Oligocene-Lower Miocene rocks sampled in the outcrops in the central and southern parts of Sakhalin Island was carried out. The Verkhneduiskaya and Sertunaiskaya formations are characterized by a lower oil-generating potential compared to the source rocks of Pilskaya Formation. A comprehensive analysis of pyrolytic, kinetic characteristics and molecular composition were made, and the studied samples were grouped according to types of the initial organic matter and maturity.
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The Role of The Model of Mechanical Properties of Bottom Sediments in The Problems of Stability of Jack-up Drilling Rigs Under Seismic Impacts
Authors I. Vasilev, N. Dubinya, V. Nachev, D. Alekseev and S. TikhotskiySummaryWhen developing such fields and drilling wells, jack-up floating drilling rigs (jack-up rigs) are actively used, the main approaches to the design and use of which were formulated relatively long ago. The operation of jack-up drilling rigs is associated with the solution of many tasks that do not arise during the development of fields located on the continent. The main focus of this work is mechanical processes that lead to a violation of stability. Among the risks, one can single out the loss of stability of the jack-up rig support columns, as well as the development of mechanical damage in them. In this work, the problem of jack-up rig stability under seismic impacts was solved using the finite element method. A finite element model was created containing elements of a tetrahedral shape. The key components of the model were: a hull, three support columns, and a sediment section. Based on the results of numerical modeling, the spatial distributions of stress and strain fields in the jack-up rig itself and in the vicinity of the supporting columns were determined. The equilibrium stress-strain state of the medium due to the jack-up rig’s own weight and soil resistance, as well as its disturbance caused by the arrival of a surface seismic wave from a large earthquake, was considered. In the course of the work, the dependence of the jack-up rig stability under various factors was investigated. The results obtained in the course of the work demonstrate the possibilities of mathematical modeling for predicting risks during the operation of the jack-up rig during the development of fields located on the continental shelf.
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Modeling The Processes of Oil and Gas Generation and Accumulation in Thick Siliceous Strata of The North Sakhalin Sedimentary Basin (Sakhalin Island)
SummaryA structural and geological model was constructed and the modeling of the processes of oil and gas generation and accumulation of hydrocarbons in the siliceous sediments of the North Sakhalin sedimentation basin was carried out. It is established that the most promising zone for the development of reservoir properties of siliceous deposits is the Opal-CT – α-Quartz transition zone. This zone is characterized by the development of maximum fracturing, which determines the capacitance and filtration properties of the rock.
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A New Device for Pulsed Neutron Gamma-Spectrometric Logging for Determining The Elemental Composition of Rocks
Authors V.I. Zverev and A.S. KhomiakovSummaryThe article describes a new AINK-PL pulsed neutron gamma-spectrometric logging equipment for determining the elemental composition of rocks, a method for obtaining elements, and provides examples of comparing the results with core data
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Indicators of Vertical Migration of Fluids (Hydrocarbons) in The Context of The Barents and Kara Seas Shelf According to 3D Seismic Data
Authors V.N. Borodkin, O.A. Smirnov, A.G. Plavnik, A.V. Lukashov and A.V. PogretskiySummaryThus, based on the analysis of 3D seismic materials, it can be said that, along with biogenic naphthydogenesis, fluid-dynamic processes widely participated in the formation of hydrocarbon deposits within the studied territory.
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Integrated Production System Modelling for Piltun-Astokhskoye Block-II Development Study: Sustaining Field Development
Authors T. Gafarov, R. Oblekov, A. Parfenov, V. Swaminathan, R. Yusipov, I. Taushev, A. Darishchev and A. MoiseenkoSummaryThe Piltun-Astokhskoye Block-II Development Study aims to deliver the most effective development concept for the area between Piltun Block I and Astokh, in the zone outside the current drilling reach of the Piltun and Astokh offshore production platforms. It also aims to optimise the full field development and accelerate gas production from gas-bearing layers. This study presents a challenge in evaluating the incremental production, fully incorporating surface backout and facility constraints using conventional reservoir models. This paper outlines how integrated production system modelling (IPSM) was used to overcome this challenge, to forecast production and reservoir performance and to evaluate production optimisation opportunities using the existing facilities and possible upgrades of the field infrastructure. The integrated production system modelling allowed the estimation of a stable production plateau rate with an optimised duration and determination of an optimal drilling sequence to be used in further evaluation. Delivery of the Block-II Development Study may allow the Company to enhance resource value, sustain production output through development of the Block-II area, significantly improve hydrocarbon production and recovery efficiency. It may also help extend field life through involving the “undeveloped” area and layers into production, and by optimising the reservoir management strategy and capital expenditures.
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Analysis of New Field-Geologic Data of The Nutov Section of The Ayashsky License Area
By M. SnachevSummaryIn early 2017, Gazpromneft Sakhalin LLC received legal rights to explore and develop the Ayashsky license area; in June of the same year, a large multilayer oil field was discovered, which later became known as Neptune. In the summer of 2018, the second exploration well within the Ayashsky license area was drilled, which discovered the Triton oilfield – the first oilfield within East Odoptinskaya anticline. Thus, PJSC Gazprom Neft entered a new region for itself and obtained the opportunity to expand the geography of offshore projects, along with Prirazlomnoye field, which is already being successfully implemented on the Arctic shelf. A large amount of field-geologic data obtained on Ayashsky license area from 2017 to 2020, made it possible to advance significantly in understanding depositional processes of the Neptune and Triton oilfields, to clarify the promising zones in terms of recoverable oil reserves and to specify the further exploration program
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