Formation conditions and structural features of the Lower Devonian carbonate reservoirs in the north-east of the Timan-Pechora petroleum basin
UDC: 550.8.052+552.54
DOI: 10.33285/2413-5011-2022-2(362)-5-13
Authors:
MASLOVA ELIZAVETA E.1
1 LLC "Special Geophysical Data Systems", Moscow, Russia
Keywords: Lower Devonian, carbonate deposits, Gamburtsev swell, Khoreyver depression, facies features, reservoir, deposit
Annotation:
The analysis of the Lower Devonian hydrocarbon deposits composition and the research of their lithofacies characteristics allowed characterizing the main factors that determine these deposits distribution within the eastern edge of the Khoreyver depression and the Gamburtsev swell of the Varandey-Adzva structural zone. The productivity of the fields under research is mainly associated with carbonate reservoirs with high degree of heterogeneity due to both sedimentation conditions and post-sedimentation transformations – dolomitization, leaching, fracturing. The Lower Devonian deposits configuration and distribution was significantly influenced by their erosion, which led to the thickness decrease of the productive Lower Devonian intervals and the Sotchemkyrta horizon’s seals.
The productivity of the deposits within the research area is associated with facies of carbonate shoals with bioclastic and frame sedimentation, as well as sublittoral facies with bacterial-algal sedimentation, but only in that part of the section where limestones were subjected to intense dolomitization and leaching. The reservoirs effective porosity is provided by the polygenic pore space, which includes inter-crystalline, cavernous and fracture pores. The argillaceous-dolomite unit of the Sotchemkyrta horizon contains low-capacity reservoirs and smaller deposits which is caused by the limited unit’s deposits distribution and facies features.
Bibliography:
1. Dushin A.S. Usloviya formirovaniya i prognoz kollektorov verkhnesiluriyskikh i nizhnedevonskikh karbonatnykh otlozheniy severnoy chasti Sadayaginskoy stupeni: dis. ... kand. geol.-miner. nauk. – Ufa, 2019. – 151 s.
2. Zhemchugova V.A. Prirodnyye rezervuary v karbonatnykh formatsiyakh Pechorskogo neftegazonosnogo basseyna. – M.: Izd-vo Mosk. gos. gornogo un-ta, 2002. – 243 s.
3. Zhemchugova V.A., Mel’nikov S.V., Danilov V.N. Nizhniy paleozoy Pechorskogo basseyna. – M.: Izd-vo Akad. gor. nauk, 2001. – 109 s.
4. Izucheniye i analiz resursnoy bazy uglevodorodnogo syr’ya na territorii Timano-Pechorskoy neftegazonosnoy provintsii. – Syktyvkar: Komi nauchnyy tsentr, 2005. – 138 s.
5. Maydl’ T.V. Litologiya i kollektory produktivnykh karbonatnykh otlozheniy nizhnego devona vala Gamburtseva // Geologiya i resursy goryuchikh iskopayemykh evropeyskogo Severa SSSR. – Syktyvkar, 1989. – S. 34–46.
6. Patrunov D.K. Sedimentatsionnyye tipy porod, obstanovki osadkonakopleniya i tsiklichnost’ litoral’nogo kompleksa karbonatnykh i karbonatno-glinistykh otlozheniy silura i nizhnego devona // Siluriyskiye i nizhnedevonskiye otlozheniya ostrova Dolgogo. – Sverdlovsk: UNTs AN SSSR, 1980. – S. 27–67.
7. Podschet zapasov i TEO KIN Nyadeyyuskogo, Cherpayuskogo i Khasyreyskogo mestorozhdeniy vala Gamburtseva / A.V. Zaynulin [i dr.]. – Ufa, 2007.
8. Podschet zapasov nefti i gaza mestorozhdeniya im. A. Titova. Nenetskiy avtonomnyy okrug / O.V. Efimova [i dr.]. – Ufa, 2015.
9. Podschet zapasov nefti i TEO KIN Kolvinskogo neftyanogo mestorozhdeniya / V.N. Titarenko [i dr.]. – Ukhta, 2012.
10. Yur’yeva Z.P., Shamsutdinova L.L. K istorii formirovaniya lokhkovskikh otlozheniy severo-vostoka Timano-Severoural’skogo regiona // Neftegazovaya geologiya. Teoriya i praktika. – 2016. – T. 11. – № 4.
Back to issue