Xinjiang Petroleum Geology

Xinjiang Petroleum Geology ›› 2010, Vol. 31 ›› Issue (2): 216-218.

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Hydrocarbon Accumulation Conditions of the Sub-Salt Strata in North-Northwestern Pre-Caspian Basin

ZHOU Sheng-you1,2, MA Yan1, TANG Yong-kun3, LI Chang-zheng2, GUI Ju2   

  1. 1. State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Beijing 100083, China;
    2. Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China;
    3. Wireline Logging Division, Greatwall Drilling Engineering Company Ltd., CNPC, Beijing 100101, China
  • Received:2009-10-10 Revised:2009-12-07 Published:2020-09-17

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Abstract: The sub-salt series of strata in north-northwestern step-fault zone of Pre-Caspian basin is a major target area for petroleum exploration and 35 oil-gas fields have been discovered. In this area, there are 4 sets of premium hydrocarbon source rocks with high abundance of organic matter, which provide premium reservoir conditions for hydrocarbon accumulation. The regional salt rocks of the Early Permian play better sealing role to the sub-salt reservoirs mainly formed in Paleozoic and dominated by organic buildup reef and anticline as types of reservoir traps. It is thought that the most favorable structural units are the zone beaded barrier reef of Permian and adjacent areas to Karachaganak oil-gas condensate field characterized by Carboniferous-Devonian reef carbonate rocks.

Key words: Pre-Caspian basin, sub-salt strata, hydrocarbon accumulation, favorable prospecting target

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