«Proceedings of Gubkin University»

Orenburg radial-concentric structure as center of hydrocarbons accumulation

UDC: 551.243.6(470.56)
DOI: 10.33285/2073-9028-2023-1(310)-65-74

Authors:

¹ Bulashevich Institute of Geophysics of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russian Federation
² Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russian Federation

Keywords: Orenburg radial-concentric structure, foundation, sedimentary cover, temporary seismic sections, “flower” structure, faults, oil and gas deposits, hydrocarbon migration routes, hydrocarbon generation centers

Annotation:

The Orenburg radial-concentric structure (ORCS) was identified in 2021 using the author's method based on seismotectonic data. The purpose of the presented work was to study its deep structure and identify the main ways of HC migration that led to the formation of oil and gas accumulations in the sedimentary cover. For this purpose, an updated interpretation of temporary regional seismic profiles was carried out, as well as a comprehensive analysis of the results of seismic exploration, remote work and monitoring data of current geotectonic processes. As a result of the study, the hierarchical structure of tectonic disturbances of the ORCS was discovered. Deep faults of the 1st rank are traced from the basement rocks into the sedimentary cover, including over-salt rocks. The feathering disturbances of the 2nd rank confined to them mainly break through the layers of the sedimentary cover. The ORCS is a large "flower" structure. The oil and gas fields associated with it are located in the development zones of smaller "flowers". It was concluded that the hierarchical structure of the ORCS faults can provide a transport system for the formation of hydrocarbon deposits, their redistribution and, possibly, recharge. The main possible ways of HC migration was identified within the ORCS.

Bibliography:

1. O vlijanii neotektonicheskih dvizhenij na osobennosti lokalizacii mestorozhdenij nefti i gaza Volgo-Ural’skoj anteklizy/A.O. Agibalov, V.A. Zajcev, E.A. Manuilova, I.V. Moshkin, A.A. Sencov// Jelektronnyj nauchno-obrazovatel’nyj zhurnal “Dinamicheskaja geologija”. – M.: MGU, 2020. – № 2. – S. 125–137.
2. Vzryvnye kol’cevye struktury shhitov i platform/V.I. Vaganov, P.F. Ivankin, P.N. Kropotkin [i dr.]. – M.: Nedra, 1985. – 200 s.
3. Kosmicheskaja informacija v geologii/ G.I. Volchkova, N.V. Lukina, V.I. Makarov [i dr.]. – M.: Nauka, 1983. – 534 s.
4. Danilova E.A. Prisdvigovye cvetkovye struktury jugo-zapada Orenburgskoj oblasti//Regional’naja geologija i metallogenija. – 2020. – T. 82. – S. 60–68.
5. Danilova E.A. Soljanye struktury osadochnogo chehla Russkoj platformy kak otrazhenie vozmozhnyh geodinamicheski aktivnyh ochagov generacii uglevodorodov v fundamente (na primere Orenburgskoj oblasti)//Geologija i geofizika juga Rossii. – 2021. – T 11, № 3. – S. 33–44.
6. Danilova E.A. Radial’no-koncentricheskie struktury v fundamente drevnej platformy i uslovija vozniknovenija ochagov generacii uglevodorodov: rekonstrukcija po sejsmotektonicheskim dannym// Geotektonika. – 2022. – № 3. – S. 36–49.
7. Drjagin V.V., Danilova E.A. Issledovanie akusticheskoj jemissionnoj aktivnosti porod pod dejstviem fljuidodinamicheskih nagruzok, modelirovanie genezisa “cvetkovyh” struktur//Trudy Rossijskogo gosudarstvennogo universiteta nefti i gaza imeni I.M. Gubkina. – 2022. – № 3 (308). – C. 32–41.
8. Luk’janov V.F. Radial’no-koncentricheskie struktury v vostochnoj chasti Voronezhskogo kristallicheskogo massiva (VKM)//Vestnik Voronezhskogo gosudarstvennogo universiteta. Serija: Geologija. – 2000. – Vyp. 9. – S. 31–37.
9. Murav’ev V.V. Geodinamika i neftegazonosnost’ sistem koncentricheskih dislokacij litosfery. V kn.: Uslovija obrazovanija i zakonomernosti razmeshhenija zalezhej nefti i gaza. – Kiev: Naukova Dumka, 1983. – S. 121–127.
10. Nesterenko M.Ju., Nesterenko Ju.M., Sokolov A.G. Geodinamicheskie processy v razrabatyvaemyh mestorozhdenijah uglevodorodov (na primere Juzhnogo Predural’ja). – Ekaterinburg: UrO RAN, 2015. – 186 s.
11. Geodinamicheski aktivnye ochagi generacii uglevodorodov kak vozmozhnye istochniki vospolnenija zalezhej Orenburgskogo neftegazokondensatnogo mestorozhdenija/S.K. Samarcev, E.A. Danilova, A.A. Dragunov, V.A. Dragunov//Burenie i neft’. – 2021. – № 4. – S. 10–13.
12. Smirnova M.N. Neftegazonosnye kol’cevye struktury i nauchno-metodicheskie aspekty ih izuchenija//Geologija nefti i gaza. – 1997. – № 9. – S. 1–6.
13. Harchenko V.M. Priroda struktur central’nogo tipa i zakonomernosti rasprostranenija zalezhej uglevodorodov, lokal’nyh i regional’nyh ochagov zemletrjasenij//Vestnik Severo-Kavkazskogo tehn. un-ta. – 2006. – T. 6, № 2. – S. 48–53.