Conditions of formation of carbonate deposits of preobrazhenskiy and erbogachenskiy horizons within licensed areas of Rosneft Oil Company OJSC in the Irkutsk region

Authors: S.K. Kvachko, A.N. Bibik (RN-KrasnoyarskNIPIneft, RF, Krasnoyarsk)

Key words: Nepsko- Botuobinskaya anticlise, facial analysis, carbonate rocks, preobrazhenskiy horizon, erbogachenskiy horizon.

The compound structure of carbonate reservoirs in Eastern Siberia prevents the forecast of zone of improved reservoir and complicates the exploration of new areas. The industrial-productive complexes of Vendian-lower- Cambrian age in a section of the Nepsko- Botuobinskaya anticlise (NBA) attract more and more researchers. In this work erbogachenskiy and preobrazhenskiy horizons confine to the oil and gas complex of the Vendian are covered. Sections of 10 wells licensed areas of Rosneft in the Irkutsk region are studied. A detailed lithofacies characteristic of deposits was carried out, the influence epi-and diagenetic processes on reservoir properties of rocks was leaded. On the base of complex research of physical composition of reservoir it was attempted to bind the features of the void volume of reservoir to conditions of their formation.

References
1. Zhemchugova V.A., Prirodnye rezervuary v karbonatnykh formatsiyakh
Pechorskogo neftegazonosnogo basseyna (Natural reservoirs in carbonate
formations of Pechora oil and gas Basin), Part 2, Moscow: Publ. of MSU,
2002, 243 p.
2. Wilson J.L., Carbonate facies in geologic history, Springer-Verlag, Berlin,
1975, 463 p.
3. Shemin G.G., Geologiya i perspektivy neftegazonosnosti venda i nizhnego
kembriya tsentral'nykh rayonov Sibirskoy platformy (Nepsko-Botuobinskaya,
Baykitskaya anteklizy i Katangskaya sedlovina) (Geology and oil and gas potential of the Vendian and Lower Cambrian of central regions of the Siberian platform (Nepa-Botuobinskaya, Baikit anteclise and Katanga saddle)), Novosibirsk: Publ. of SB RAS, 2007, 467 p. 

Key words: Nepsko- Botuobinskaya anticlise, facial analysis, carbonate rocks, preobrazhenskiy horizon, erbogachenskiy horizon.

The compound structure of carbonate reservoirs in Eastern Siberia prevents the forecast of zone of improved reservoir and complicates the exploration of new areas. The industrial-productive complexes of Vendian-lower- Cambrian age in a section of the Nepsko- Botuobinskaya anticlise (NBA) attract more and more researchers. In this work erbogachenskiy and preobrazhenskiy horizons confine to the oil and gas complex of the Vendian are covered. Sections of 10 wells licensed areas of Rosneft in the Irkutsk region are studied. A detailed lithofacies characteristic of deposits was carried out, the influence epi-and diagenetic processes on reservoir properties of rocks was leaded. On the base of complex research of physical composition of reservoir it was attempted to bind the features of the void volume of reservoir to conditions of their formation.

References
1. Zhemchugova V.A., Prirodnye rezervuary v karbonatnykh formatsiyakh
Pechorskogo neftegazonosnogo basseyna (Natural reservoirs in carbonate
formations of Pechora oil and gas Basin), Part 2, Moscow: Publ. of MSU,
2002, 243 p.
2. Wilson J.L., Carbonate facies in geologic history, Springer-Verlag, Berlin,
1975, 463 p.
3. Shemin G.G., Geologiya i perspektivy neftegazonosnosti venda i nizhnego
kembriya tsentral'nykh rayonov Sibirskoy platformy (Nepsko-Botuobinskaya,
Baykitskaya anteklizy i Katangskaya sedlovina) (Geology and oil and gas potential of the Vendian and Lower Cambrian of central regions of the Siberian platform (Nepa-Botuobinskaya, Baikit anteclise and Katanga saddle)), Novosibirsk: Publ. of SB RAS, 2007, 467 p. 


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