GAS TARGETS OF THE VENDIAN AND CAMBRIAN PETROLEUM PLAYS IN THE TASEEVSKY BLOCK OF THE CIS-SAYAN-YENISEI SYNECLISE IN THE SIBERIAN PLATFORM

N. V. Melnikov 1, A. S. Efimov 1, Yu. A. Filiptsov 2, E. V. Smirnov 1, V. N. Bespechny 1, L. V. Medyukhina 1, E. G. Naumova 1

1 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia; 2 Department of Subsoil Use for the Central-Siberian Region, Krasnoyarsk, Russia

The cross-section of the Taseevsky block of the Cis-Sayan-Yenisei syneclise was analysed based on drilling data. The analysis has shown the potential for searching for gas in the Vendian and Cambrian deposits and, probably, the fractured rocks in the upper Riphean strata. The authors estimated the potential of individual formations of the Taseevskaya Series. They examined local areas with gas traps in the sandstones of the Vendian Redkolesnaya Formation and in the carbonates of the Cambrian Nizhnebelskaya Subformation. It was revealed that structural traps in brachyanti clines and domes prevail in the Vendian, and traps constrained by salt diapirs are common in the Cambrian. The article gives the structure of traps, their size, area, heights, conditional gas-water contacts on maps and in geological sections. The article contains the appraisal of localised resources of gas as a prevailing hydrocarbon at the block. The sandstones of the Redkolesnaya Formation in the Vendian petroleum play contain 570 bln m3 of gas in six traps with the total area of 760 km2, and the carbonates of the Nezhnebelskaya Subformation in in the Cambrian petroleum play contain 190 bln m3 of gas in six traps with the total area of 510 km2. Based on this appraisal, the authors suggest commencing a new exploration cycle at the block, taking into account that the required infrastructure is available there.

Key words: Cis-Sayan-Yenisei syneclise, Taseevsky block, potential gas content, Vendian petroleum play, Cambrian petroleum play, localised gas resources.

DOI 10.20403/2078-0575-2017-1-12-29

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