Sergo Ordzhonikidze Russian State University for Geological Prospecting, Moscow, Russia

V. Yu. Kerimov, Head of Department, Professor, Doctor of Geological and Mineralogical Sciences, Honored Geologist of Russia, kerimovvy@mgri.ru
A. K. Shatyrov, Engineer

Appraisal drilling in the most promising zones of downfolds at the outskirts of the Okhotsk Sea Plate showed a sensible difference in their oil and gas potential. The largest oil and gas reservoirs are discovered on the east shelf of the Neogene Paleo-Amur delta in the North Sakhalin oil and gas province limited by the Schmidt zone of uplifts. This site features an optimal combination of lithological and structural factors for oil traps to form, as well as the spatial connection of oil and gas source rocks and enclosing rocks. Beyond the delta in the aquatic area studied via drilling in the Sea of Okhotsk, either claying or silting of the local productive series takes place. The analysis of deposition conditions in sedimentary basins in the aquatic area of the Sea of Okhotsk allows assessment of sedimentary environment for oil and gas reservoirs to form. There are three types of sedimentary basins in the studied region. The basins of the first type are characterized by an optimal combination of sedimentary, geodynamic and structural tectonic conditions. In the Sea of Okhotsk, these are the sedimentary basins of the North Sakhalin and, to a lesser extent, the Deryugin basin. The sedimentary basins of the second type are located near the mainland or island coasts. Many basins of the Far Eastern Seas can be attributed to this type. In particular, in the Sea of Okhotsk, these are the basins of the North Okhotsk and West Kamchatka shelf zones. The sedimentary basins of the third type, which include the Central Okhotsk Group of continental and uneven depressions, and subbasins of Tinro and Deryugin, are far and isolated from the continental sources of ablation of terrigene clastic rocks, and represent mainly marine clay or clay–siliceous sediments. The primary areas for geological exploration are the first-type sedimentary basins or sub-basins in the aquatic area adjacent to the northeastern and eastern parts of the Sakhalin Island.

1. Kerimov V. Yu., Khoshtariya V. N., Bondarev A. V., Sizikov E. A. Source kitchen of Sakhalin–Okhotsk shelf. Trudy Rossiyskogo gosudarstvennogo universiteta nefti i gaza imeni I. M. Gubkina. 2016. No. 2(283). pp. 5–15.
2. Geresh G. M. Role of additional exploration in production drilling at reservoirs in the shelf of the Sakhalin Island. News of Gas Science : Science and Technology Digest. Moscow, 2020. No. 3(45). pp. 32–39.
3. Degtyarev V. A., Sizanov B. I., Kostrov Yu. V., Khmarin E. K., Khaliulin R. R. Refinemento f the facies model of the North-Eastern part of Sakhalin island for targeting the emplacement of siliceous strata. Neftegazovaya geologiya. Teoriya i praktika. 2021. Vol. 16, No. 2. DOI: 10.17353/2070-5379/12_2021
4. Astafev D. A., Kabalin M. Yu., Skorobogatov V. A. Appraisal and development of hydrocarbon potential of the Okhotsk Sea Province. News of Gas Science : Science and Technology Digest. Moscow, 2021. No. 3(48). pp. 161–177.
5. Bakulina L. P. Facies analysis : Instructional Guidelines. Ukhta : Izdatelstvo UGTU, 2008. 34 p.
6. Serikova U. S. The global history of exploration of oil and gas resources offshore. Neft, gaz i biznes. 2015. No. 9. pp. 13–16.
7. Lapidus A. L., Kerimov V. Yu., Mustaev R. N., Movsumzade E. M., Salikhova I. M. et al. Natural Bitumens: Physicochemical Properties and Production Technologies. Solid Fuel Chemistry. 2018. Vol. 52, No. 6. pp. 344–355.
8. Shegay V. I., Tolstikov A. V. Upper Miocene and Pliocene deposits of north-eastern shelf of Sakhalin Island: new seismic data on structure and petroleum potential. Geologiya nefti i gaza. 2022. No. 3. pp. 67–83.
9. Kerimov V., Rachinsky M., Mustaev R., Serikova U. Geothermal conditions of hydrocarbon formation in the South Caspian basin. Iranian Journal of Earth Sciences. 2018. Vol. 10, Iss. 1. pp. 78–89.
10. Du M., Lei J., Zhao D. New seismic constraints on arc magmatism and subduction dynamics beneath the Japan Islands from Sn tomography. Journal of Asian Earth Sciences. 2023. Vol. 256. ID 105802.
11. Guo Z.-X., Shi Y.-P., Yang Y.-T., Jiang S.-Q., Li L.-B. et al. Inversion of the Erlian Basin (NE China) in the early Late Cretaceous: Implications for the collision of the Okhotomorsk Block with East Asia. Journal of Asian Earth Sciences. 2018. Vol. 154. pp. 49–66.
12. Volkova P. A., Ivanova M. O., Dadykin I. A., Tikhomirov N. P., Grigoryan M. Yu. et al. Unexpected burst of new data on vascular plants flora for the Lesser Kuril Ridge and the whole Kuril archipelago. Journal of Asia-Pacific Biodiversity. 2020. Vol. 13, Iss. 4. pp. 738–744.
13. Kerimov V. Yu., Lavrenova E. А., Shcherbina Yu. V., Mamedov R. А. Cretaceous-Cenozoic hydrocarbon systems of the Eastern Arctic Seas. IOP Conference Series: Earth and Environmental Science. 2022. Vol. 988, No. 3. ID 032016.
14. Nikitenko O. A., Ershov V. V. Hydrogeochemical indicators for the exploration and development of hydrocarbon fields: Review, analysis and prospects for use on Sakhalin Island. Geosistemy perekhodnykh zon. 2021. Vol. 5, No. 4. pp. 361–377.
15. Stupakova A. V., Suslova A. A., Knipper A. A., Karnyushina E. E., Krylov O. V. et al. Features of the geological structure and oil and gas content of the shelves of the Far Eastern seas. Georesursy. 2021. Vol. 23, No. 2. pp. 26–34.