ISSN 2413-5011 Scientific-technical journal AND DEVELOPMENT OF OIL AND GAS FIELDS published since 1992 April 2021 ¹ 4(352) 12 issues per year
CONTENÒS |
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OIL AND GAS PROSPECTING |
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THEORETICAL ASPECTS IN GEOLOGY |
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Maslov V.V. Paleotectonic prerequisites for oil and gas potential prospects in Eastern Ustyurt (p. 34‑42) |
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GEOLOGICAL MODELING |
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GEOCHEMICAL RESEARCH WORK |
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DEVELOPMENT OF OIL AND GAS FIELDS |
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ANNIVERSARY DATES |
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Information on the articles |
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UDC 553.98:550.812 DOI: 10.33285/2413-5011-2021-4(352)-5-13
MODERN ASSESSMENT OF THE OIL AND GAS POTENTIAL
OF THE REPUBLIC OF KALMYKIA
Yuriy Vyacheslavovich Kuranov, Vadim Foatovich Sharafutdinov, Dr. of geol.-mineral. sci.
LLC "LUKOIL–Engineering" 3, bld. 1, Pokrovsky boulevard, Moscow, 109028, Russian Federation, e-mail: yvkuranov@yandex.ru, vsharaf@inbox.ru
Vladimir Alekseevich Gridin, Dr. of geol.-mineral. sci.
North-Caucasus Federal University, Institute of Oil and Gas 16, bld. 1, Kulakov prosp., Stavropol, 355035, Russian Federation, e-mail: gridinva@mail.ru
Over the past two decades, research organizations and oil and gas companies have carried out a significant amount of geological exploration work on the territory of the Republic of Kalmykia, the results of which were not properly summarized earlier. The authors present a modern assessment of the oil and gas potential of Kalmykia using a significant amount of previously unanalyzed materials on its territory and the region as a whole. The modern assessment shows that the territory of the Republic of Kalmykia and Kalmykia shallow shelf of the Caspian sea still have significant oil and gas potential and a resource base of hydrocarbons (HC) that isn`t involved in development Based on the analysis of the geochemical data and methods of basin analysis, the authors of the paper proposed a model for the formation of hydrocarbon deposits on the territory of Kalmykia and in the Kalmykia shallow shelf of the Caspian Sea. According to the proposed model, the oil and gas potential of the Republic's territory is determined by two main areas of hydrocarbons generation: the south-western edge of the Caspian basin in the northern part of Kalmykia and the East-Manych trough (Manych deflection zone) in the southern part. A significant role of the Tersk-Caspian trough is predicted in the formation of oil and gas deposits in the Kalmykia shallow shelf of the Caspian Sea. The territory of the Republic is characterized by insufficient and uneven degree of geological and geophysical study, lack of geological exploration stages, incomplete regional stage of geological study. To date, the southern part of the Republic is the most prepared one for further development. It represented in tectonic terms by the Karpinskiy ridge and the Manych deflections zone. The authors suggest the following priority areas for further exploration in the southern part of the Republic: Jurassic-Cretaceous sediment complex (including Kalmykia shallow shelf of the Caspian Sea), Permian-Triassic and Paleozoic sediment complex. Jurassic and Cretaceous sediments have not yet exhausted their resource potential and are able to maintain the existing levels of hydrocarbon production in the Republic. It is evidenced by the discovery of new oil and gas deposits. Sediments of the pre-Jurassic complex can significantly increase the potential resource base of hydrocarbons in Kalmykia and the volume of hydrocarbon production in the Republic. In the Permian-Triassic complex the main oil and gas prospects are associated with Neftekumsk formation of the East-Manych trough (priority recommended object – Tsekertinskaya structure) and with possible analogue of the carbonate Neftekumsk formation in the grabens of the Karpinskiy ridge. In the Paleozoic complex, it is necessary to clarify the prospects for oil and gas content of the carboniferous sediments of the Karpinskiy ridge and the Manych deflections zone (the first recommended polygon for geological exploration is the Tsubuksko-Promyslovskiy shaft).
Keywords: oil and gas potential prospects; Eastern Ciscaucasia; Karpinskiy ridge; East-Manych trough; Republic of Kalmykia; Mesozoic sediments; Permian-Triassic sediments; Neftekumsk formation; Paleozoic complex; water area of the Caspian Sea.
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UDC 551.24:553.98(470.1) DOI: 10.33285/2413-5011-2021-4(352)-14-23
THERMAL HISTORY AND PETROLEUM GENERATION
EVOLUTION OF THE EXTERNAL ZONE
Ivan Sergeevich Kotik, Cand. of geol.-mineral. sci.
Institute of Geology of Komi Science Centre of the Ural Branch of the Russian Academy of Sciences (IG FRC Komi SC UB RAS) 54, Pervomayskaya str., Syktyvkar, 167982, Russian Federation, e-mail: ivkotik@gmail.com
Yuriy Ivanovich Galushkin, Dr. of tech. sci.
Lomonosov Moscow State University, Museum of Earth Sciences 1, Leninskie Gory, Moscow, 119991, Russian Federation, e-mail: yu_gal@mail.ru
The Korotaikha depression is one of the least studied structures and is considered as a promising area for discovering new hydrocarbon (HC) deposits in the Timan-Pechora oil- and gas-bearing basin. The basin analysis and modeling of petroleum generation in the Korotaikha depression were considered by specialists from various organizations (VNIGRI, Institute of Geology of Komi SC UB RAS, Lomonosov Moscow State University, LLC "LUKOIL-Engineering", etc.). However, in these works, evolution of the basin thermal regime is nearly unconsidered. This paper presents the results of modeling of the basin thermal evolution and realization of HC potential according to the data from 1-Korotaikha well using the GALO basin modeling program. Analysis of variations in the basement tectonic subsidence assumes three stages of lithospheric stretching: in the Early Ordovician, Givetian-Early Permian, and Kungurian-Late Triassic period. The amplitudes of the lithospheric stretching are β = 1,04…1,07 (β-factor). Thermal activation of the lithosphere was observed in the Jurassic-Cenozoic period and was accompanied by significant erosion of accumulated sediments. The heat flow density through the basement surface varied within 40…50 mW/m2 for most of the Paleozoic and Meso-Cenozoic stages of the basin development. Modeling of the history of HC potential realization showed that the organic matter (OM) of the Upper Silurian, Lower and Upper Devonian petroleum source rocks has fully realized its generation potential. The realization level of the OM generation potential in the Lower Permian source rocks is about 70 %. The Upper Silurian and Devonian sediments were buried at significant depths (up to 9,4 km), which could lead to the partial decomposition of previously generated liquid HC into gas and coke during secondary cracking, if they did not migrate to horizons with more moderate thermal conditions. Permian source rocks containing terrigenous, rarely mixed terrigenous-marine OM, could generate mainly gas. Thus, the phase composition of potential HC accumulations in the investigated part of the Korotaikha depression is assumed to be either predominantly gas, or gas and gas-oil in the Carboniferous and Permian-Triassic complexes, if there was a vertical migration of oil HC from the Upper Silurian-Devonian deposits.
Keywords: Korotaikha depression; basin modeling; source rocks; catagenesis; hydrocarbon generation.
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UDC 553.98(571.1)(–17) DOI: 10.33285/2413-5011-2021-4(352)-24-33
MESOZOIC-CAINOZOIC MAGMATISM OF THE BARENTS SEA SHELF (p. 24)
Vladimir Nikolaevich Borodkin1,2, Dr. of geol.-mineral. sci., Arkadiy Romanovich Kurchikov1, Dr. of geol.-mineral. sci., Oleg Arkadievich Smirnov3, Cand. of geol.-mineral. sci., Andrey Viktorovich Lukashov3, Alexander Vladimirovich Pogretsky4
1A. Trofimuk Institute of Petroleum Geology and Geophysics, the West-Siberian branch of the Russian Academy of Sciences 56, Volodarsky str., Tyumen, 625000, Russian Federation, e-mail: niigig@tmnsc.ru
2Tyumen Industrial University (TIU) 38, Volodarsky str., Tyumen, 625000, Russian Federation
3LLC "INGEOSERVICE" 211, Respublika str., Tyumen, 625019, Russian Federation, e-mail: info@ingeos.info
4LLC "Gazprom geologorazvedka" 70, Hertsen str., Tyumen, 625000, Russian Federation
The paper analyzes the distribution of magmatic formations based on the results of many years of research both within the East Barents Sea megafold and on the adjacent islands. Several stages of magmatism manifestation within the studied area have been identified, and three cycles of maximum magmatic activity have been revealed. Within one of the license areas of the Barents Sea shelf, the manifestation of magmatism was identified both by drilling data and by 3D seismic surveydata. Magmatic manifestations contributed to the formation of abnormally high reservoir pressures in the Triassic and underlying sediments due to the fluids inflow from deep-lying horizons and, apparently, the formation of secondary hydrocarbon deposits.
Keywords: shelf; archipelago; magmatism; cyclicality; 3D seismic survey.
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UDC 553.98(575.1) DOI: 10.33285/2413-5011-2021-4(352)-34-42
PALEOTECTONIC PREREQUISITES FOR OIL AND GAS
POTENTIAL PROSPECTS
Vadim Vladimirovich Maslov, Cand. of geol.-mineral. sci., associate professor
National University of Oil and Gas "Gubkin University" 65, bld. 1, Leninsky prosp., Moscow, 119991, Russian Federation, e-mail: maslov.v@gubkin.ru
The paper considers the problem of paleotectonic prerequisites for the prospects of oil and gas potential prospects of Eastern Ustyurt. The paleotectonic reconstructions, presented by the author, allowed the geological history tracing of Eastern Ustyurt development up to the Jurassic period. It is noted that in the middle Triassic age, intense stress strain covered the entire Ustyurt region, causing the formation of thrust and fault systems. During the Jurassic period, all modern structural elements of the studied region were formed. The factor of deep deflections under anticline traps developed in the Meso-Cainozoic age plays a positive role in the formation of hydrocarbon deposits.
Keywords: Eastern Ustyurt; paleotectonics; forecast of oil and gas potential, Jurassic age; Paleozoic age.
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UDC 622.24.001.57 DOI: 10.33285/2413-5011-2021-4(352)-43-48
NUMERICAL 3D GEOMECHANICAL MODEL (THE CASE OF PJSC “LUKOIL” OIL FIELD) (p. 43)
Andrey Aleksandrovich Predein, Pavel Igorevich Klykov, Olga Vladimirovna Garshina, Gennadiy Vladimirovich Okromelidze, Cand. of tech. sci., Sergey Aleksandrovich Kuznetsov, Maria Fedorovna Kilina, Sergey Ivanovich Kuchevasov
LUKOIL–Engineering Limited PermNIPIneft Branch Office in Perm 29, Sovetskaya Armiya str., Perm, 614022, Russian Federation, e-mail: Andrej.Predein@pnn.lukoil.com, Pavel.Klykov@pnn.lukoil.com, Olga.Garshina@pnn.lukoil.com, Gennadij.Okromelidze@pnn.lukoil.com, Sergej.Kuznecov@pnn.lukoil.com, Maria.Kilina@pnn.lukoil.com, Sergej.Kuchevasov@pnn.lukoil.com
The results of geomechanical simulation for solving problems of provision of accident-free well drilling are considered. A numerical 3D geomechanical model for the field under study with the subsequent stability calculation of producing wells is developed. A method of 1D geomechanical simulation on reference wells was studied, including determination of dynamic and static elastic strength characteristics of rocks, calculation of pore pressure and vertical and horizontal stress. Well stability calculations based on the 1D geomechanical simulation results were obtained and analyzed. Next, the results of 3D geomechanical simulation were analyzed: determination of the limits and development of the model’s structural framework, geometry testing, filling the grid with mechanical properties, as well as calculation of the total stress tensor by the finite element method (FEM). The results of 1D and 3D modeling were compared. Herewith, a numerical 3D geomechanical model for the field under study was developed. The next step was to calculate wellbore stability for projected wells. Additionally, cubes of pressure gradients of drilling mud absorption, rock caving and hydraulic fracturing at various inclination angles and drilling directions were calculated. Recommendations have been developed for accident-free well construction in the field under study, including real-time support and update of the geomechanical model during drilling. The results obtained and the operations method can be used in the design and construction of wells in other fields subject to regional specifics.
Keywords: geomechanics; stress calculation; finite element method; wellbore stability; pore pressure; rock caving pressure; absorption pressure; hydraulic fracturing pressure; horizontal drilling.
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UDC 553.98(262.81)+550.84 DOI: 10.33285/2413-5011-2021-4(352)-49-52
APPLYING GEOCHEMICAL DATA TO EVALUATE OIL AND
GAS PROSPECTS OF MIDDLE,
Arnold Yakovlevich Kuklinskiy, Cand. of chemical sci., Alexey Nikolaevich Moroshkin, Cand. of geol.-mineral. sci., Alexey Vladimirovich Ermolovskiy, Cand. of tech. sci.
LUKOIL−Engineering Limited PermNIPIneft Branch Office in Volgograd 96, Lenin prosp., Volgograd, 400078, Russian Federation, e-mail: Arnold.Kuklinsky@lukoil.com, Alexey.Moroshkin@lukoil.com, Alexey.Ermolovsky@lukoil.com
Sergey Yuryevich Shtun, Cand. of geol.-mineral. sci.
LLC "LUKOIL–Nizhnevolzhskneft" 1, bld. 2, Admiralteiskaya str., Astrakhan, 414000, Russian Federation, e-mail: Sergej.Shtun@lukoil.com
The results of geochemical studies are generalized and the prospects for the oil and gas potential of the Middle, Upper Jurassic and Lower Cretaceous (Berriassian stage) deposits of the Sarmatian-Khvalynskaya zone of uplifts are assessed according to the geochemical data. The main directions of cross-well correlations of sections and geochemical zoning of oil and gas accumulation are revealed. The research was based on the study of the physical and chemical properties and molecular composition of oils and condensates.
Keywords: geochemical study; oil and gas potential prospects; hydrocarbon composition; oil deposits.
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UDC 622.276.5.001.42 DOI: 10.33285/2413-5011-2021-4(352)-53-61
NEW METHOD OF WELL TEST DATA INTERPRETATION AND
PRODUCTION FORECASTING
Ivan Vladimirovich Afanaskin, Cand. of tech. sci.
Federal State Institution "Scientific Research Institute for System Analysis of the Russian Academy of Sciences" 36, bld. 1, Nakhimovsky prosp., Moscow, 117218, Russian Federation, e-mail: ivan@afanaskin.ru
The paper describes precise and approximate solutions of the problem related tor homogeneous compressible fluid inflow to a hydraulically fractured well in an elastic homogeneous infinite reservoir with a non-permeable cover and bottom. Special attention paid to the finite conductivity fracture case. A method of a well test data interpretation and prediction of hydraulically fractured vertical wells operation is proposed which is based on an approximate solution. The method utilizes solution of bottomhole pressure calculation not only for standard inflow modes but also for intermediate modes. Two examples also presented.
Keywords: well testing; hydraulically fractured vertical wells.
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UDC 622.276.4:551.243 DOI: 10.33285/2413-5011-2021-4(352)-62-67
IMPERMEABLE SCREEN IDENTIFICATION BY DRAWDOWN
CURVE ANALYSIS
Valeriy Adolfovich Yudin, Cand. of phys.-math. sci., Sergey Grigorievich Volpin, Cand. of tech. sci., Natalia Petrovna Efimova, Ivan Vladimirovich Afanaskin, Cand. of tech. sci.
Federal State Institution "Scientific Research Institute for System Analysis of the Russian Academy of Sciences" 36, bld. 1, Nakhimovsky prosp., Moscow, 117218, Russian Federation, e-mail: yudinval@yandex.ru
Possibility of impermeable screen identification in fault’s dynamic influence zone (DIZ) by using pressure drawdown measurements in the well drilled and put into operation in such zone is analyzed. A number of variants were examined: existence and absence of impermeable screen, values of DIZ permeability and width, eccentricity of a well location in DIZ. It was shown that in some situations presence of the impermeable screen can be determined by using comparison of experimental drawdown curve (PDC) with PDC calculated in alternative model without such screen. It has been found that it would be possible if the real width of DIZ doesn’t exceed some threshold value. But in many cases the solution of such problem leads to ambiguous conclusions about a fault occurrence.
Keywords: well tests; drawdown curve; fault; fault permeability structure, impermeable fault.
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CONGRATULATIONS TO A.B. ZOLOTUKHIN ANNIVERSARY! (p. 68)
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NATIONAL UNIVERSITY OF OIL AND GAS "GUBKIN UNIVERSITY" |