GENETIC TYPES OF CARBONATE ROCKS OF THE OSA HORIZON, THE MAJOR OIL RESERVOIR OF THE LARGE TALAKAN DEPOSIT (Western Yakutia)
A.F. Safronov, M.D. Bulgakova*, and V.V. Gaiduk**
Institute of Oil and Gas Problems, Siberian Branch of the RAS, 1 ul. Oktyabr'skaya, Yakutsk, 677981, Russia
* Institute of Geology of Diamonds and Noble Metals, Siberian Branch of the RAS, 39 prosp. Lenina, Yakutsk, 677891, Russia
** Yakutskgeofizika Joint-Stock Company, 1 ul. Bilibina, Yakutsk, 677008, Russia
Keywords: Microfacies, mesofacies, reservoir rock, porosity, permeability
Pages: 130-136
Abstract
A system lithofacies analysis refined the role of primary sedimentogene factors in the formation of reservoir properties of carbonate rocks in the O-I producing bed of the Talakan petroleum deposit. The bed bears 11 microfacies and 3 mesofacies - algal-microbial organogenic buildings, accumulative bodies of peloid sediments, and small, periodically drying basins of elevated and high salinity made up of chemogenic carbonate-sulfate sediments. The best reservoir properties are observed for rocks of peloid microfacies.
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