V.I. Shegai, Ya.I. Shtein, A.V. Tolstikov
Structural features of Lower and Middle Miocene pay interval (Daginsky Horizon) in the area of the Kirinsky Block, the Sakhalin Shelf
DOI 10.31087/0016-7894-2022-2-31-44
Key words: the Sea of Okhotsk region; Sakhalin; Kirinsky Block; Sequence Stratigraphy; Facies Analysis; Daginsky Horizon, reservoir.
For citation: Shegai V.I., Shtein Ya.I., Tolstikov A.V. Structural features of Lower and Middle Miocene pay interval (Daginsky Horizon) in the area of the Kirinsky Block, the Sakhalin Shelf. Geologiya nefti i gaza. 2022;(2):31–44. DOI: 10.31087/0016-7894-2022-2-31-44. In Russ.
Studies of target Middle and Upper Daginsky subhorizon section (N11–2dg — Early – Middle Miocene, 6а Reflector – 6 Reflector) within the promising Kirinsky License Area on the Sea of Okhotsk Shelf were carried out on the basis of integrated analysis of well and seismic data. Seven depositional cyclothems (SB6–SB0) were identified in the interval under consideration with building facies schemes for each of them. The studies demonstrated that regressive sedimentation prevailed for much of the mentioned period, resulting in the formation of a progradational package of parasequences (SB6–SB2). In the late Daginsky time, the regression changes for aggradation. SB1 cyclothem formed at that time has high net-to-gross and good lateral continuity. The locally occurring transgressive SB0 cyclothem closes formation of the Daginsky series. Area of its occurrence is limited to the western part of the Kirinsky area. These structural features of the Upper Daginsky subhorizon are responsible for mismatch in indexing pay horizons, which is used for the objects in the western part of the study area (Lunskoe, South Lunskoe fields) in the target pay interval subdivision scheme accepted for the Kirinsky, South Kirinsky, and Mynginsky fields in the southern and eastern parts of the area under consideration. Results of the studies presented in the paper allow obtaining a single consistent system that includes all actual data about pay section architecture within this large rapidly-developing gas producing region, which were obtained during the course of geological studies of the fields.
Vadim I. Shegay ORCiD Scopus
Leading Project Specialist
PetroTrace,
10/4 ul. Letnikovskaya, Moscow, 115114, Russia
e-mail: vadim.shegay@ptgeos.com
Yan I. Shteyn
Candidate of Geological and Mineralogical Sciences,
Chief specialist
Arkticheskii nauchnyi tsentr,
33/13, str. 2 ul. Bolshaya Yakimanka, Moscow, 119049, Russia
e-mail: iaishtein@rn-anc.ru
Alexey V. Tolstikov
Head of the Laboratory
Gazprom VNIIGAZ,
15 Proyektiruyemy proyezd № 5537, bld. 15, poselok Razvilka,
Vidnoye, Moscow region, 142717, Russia
e-mail: A_Tolstikov@vniigaz.gazprom.ru
1. Astafyev D.A., Tolstikov A.V., Naumova L.A., Kabalin M.Yu. Russian Offshore Promising Oil & Gas Exploration Areas. ROGTEC. 2020;(58): 74–91. In Russ.
2. Bychkov A.V., Koblov Eh.G., Kharakhinov A.V. Oil and gas exploration trends of North Sakhalin and offshore. Nauchno-tekhnicheskii vestnik OAO “NK “Rosneft’”. 2012;(3):8–11. In Russ.
3. Gainanshin R.N., Logvinenko N.V., Zhukovskaya E.A., Snachev M.V., Litvin V.V., Tanygin I.A. The Sakhalin offshore – new horizons. Neftyanoe khozyaistvo. 2018;(12):22–26. DOI: 10.24887/0028-2448-2018-12-22-24. In Russ.
4. Novikov YU.N., Margulis L.S., Andieva T.A., Goma L.M., Pylina L.M., Bol’shakova N.V., Krestina O.I., Turova E.S. Regional hydrocarbon potential of the far east in the XXI century: exploration results and trends in subsoil use. Neftegazovaya geologiya. Teoriya i praktika. 2015;(2): Available at: http://www.ngtp.ru/rub/4/23_2015.pdf. DOI: 10.17353/2070-5379/23_2015 (accessed on 12.11.2021). In Russ.
5. Tolstikov A.V., Astaf’ev D.A., Kabalin M.Yu., Naumova L.A., Sharov S.A. New challenges of geological prospecting and exploration at Northeast shelf of Sakhalin. Nauchno-tekhnicheskii sbornik “Vesti gazovoi naukI”. 2020;(3):3–15. Available at: http://vesti-gas.ru/sites/default/files/files/vgn_3-45-2020-all.pdf. (accessed on 12.11.2021). In Russ.
6. Sequence Stratigraphy of Siliciclastic Systems – The ExxonMobil Methodology (Concepts in Sedimentology and Paleontology (CSP) Series). In: V. Abreu, J. Neal, K. Bohacs, J. Kalbas., eds. SEPM; 2010. 226 p. In Russ.
7. Emery D., Myers K. Sequence stratigraphy. London: Blackwell science Ltd; 1996. pp. 23–25. In Russ.
8. Ol’neva T.V. Seismofatsial’nyi analiz. Obrazy geologicheskikh protsessov i yavlenii v seismicheskom izobrazhenii [Seismofacial analysis. Images of geological processes and phenomena in a seismic image]. St. Petersburg: Institut komp’yuternykh issledovanii; 2018. 152 p. In Russ.
9. Kharakhinov V.V. Neftegazovaya geologiya Sakhalinskogo regiona [Petroleum Geology of the Sakhalin Region]. Moscow: Nauchnyi mir; 2010. 276 p. In Russ.