The material composition of reservoir rocks of the pre-Jurassic formations of the Shaimsky oil and gas region

The Shaim oil and gas bearing region is situated in the central part of the Pre-Ural oil and gas province in the southwest of the Khanty-Mansi Autonomous Okrug and covers the Sovetsky and Kondinsky administrative districts. Oil exploration in the Shaim region began over than fifty years ago; however, studying the geological structure and hydrocarbon potential of this area remains important. Commercial productivity was confirmed in the Upper Jurassic, Middle Jurassic, and pre-Jurassic oil and gas complexes. The exploration of hydrocarbon potential in Pre-Jurassic deposits has a long history. While fields are actively tapping into these deposits, many unresolved and controversial issues persist, and the results of hydrocarbon exploration in Pre-Jurassic rocks are still modest. In the Shaim oil and gas bearing region, commercial reserves of oil and dissolved gas were identified in the upper part of Pre-Jurassic deposits at fourteen fields, including the Ubinskoye, Tolumskoye, Mortymya-Teterevskoye, Danilovskoye, Severo-Danilovskoye, Potanayskoye, Talnikovskoye, and others. This study analyzes core samples from wells that have penetrated productive intervals of the Pre-Jurassic section (Danilovskaya, Severo-Danilovskaya, Zapadno-Kayumovskaya, Srednemulyminskaya, Andreevskaya, Zapadno-Semividovskaya, Potanay-Kartopyinskaya, Mulyminskaya, and other areas).

1. Smirnov L. V., Nedospasov A. I., Surkov V. S., Fateev A. V., Tugareva A. V., Chernova G. A., Yakovleva N. P. Geologo-formatsionnaya model' doyur-skogo osnovaniya KHMAO — Yugry. Puti realizatsii neftegazovogo i rudnogo potent-siala KHMAO — Yugry: materialy ХX nauchno-prakticheskoy konferentsii, Khanty-Mansiysk, 2017. Vol. I. P. 78–87. (In Russ.).

2. Ivanov K. S., Fedorov Yu. N., Erokhin Yu. V., Ponomarev V. S. Geological structure of the basement of the Ural part of the West Siberian oil and gas mega-basin. Yekaterinburg: IGG Ural branch of the Russian Academy of Sciences; 2016. (In Russ.).

3. Chernova G. A., Tugareva A. V. Veshchestvennyy sostav produktivnykh kollektorov v doyurskikh otlozheniyakh na territorii KHMAO — Yugry. Puti realizatsii neftegazovogo i rudnogo potentsiala KHMAO — Yugry: materialy XVI nauchno-prakticheskoy konferentsii, Khanty-Mansiysk, 2013(2). P. 230–241. (In Russ.).

4. Kurysheva N. K. Forecasting and mapping of oil and gas deposits in the upper part of the Pre-Jurassic complex based on seismogeological data in the Shaimsky oil and gas region and adjacent areas. Tyumen; 2005. (In Russ.).

5. Krinochkin V. G., Fedorov Yu. N., Ivanov K. S., Kutovaya I. V., Lebe-dev A. I., Lazar' E. L. Geological structure and oil and gas potential of the pre-Jurassic complex of the Symoryakh site (Shaimsky NGR), Gornye Vedomosti. 2008;11(54):6–18. (In Russ.).

6. Yakovleva, N. P., Myasnikova G. P., Chernova G. A. Material composition and prospects of oil and gas potential of Triassic and Permian-Triassic deposits in the west of the Khanty-Mansiysk Autonomous Okrug — Yugra. Oil and Gas Studies. 2017;(4):42–50. (In Russ.).