Condition of Hydrocarbon Accumulation in Tuonamu Area in Qiangtang Basin, Nor thern Tibet

Abstract

Abstract: Tuonamu area adjacent to Qiangbei depression and the central uplift belt is a relatively stable structure area in Qiangtang basin, where develops Suowa formation and Xueshan formation of Upper Jurassic. The oil and gas shows are fractured bitumen vein, oilimmersed limestone and shale, indicating that there exists process of large-scale hydrocarbon generation, migration and accumulation as basic geologic conditions for forming oil-gas field or reservoir. The characteristics of reservoir rock and cap rock in this area indicate that they belong to medium-quality reservoir rock and medium-advantageous cap rock. The source-reservoir-cap rocks could be classified into three Class-II assemblages of IV₁, IV₂ and IV₃, of which IV2 is the most favorable for exploration, IV₁ is the better and IV₃ is relatively poor. It is concluded that Tuonamu area is of good conditions for hydrocarbon accumulation such as advantageous source rock, medium maturity, multi-type reservoirs, good reservoir quality and developed cap rock.

Key words: Qiangtang basin, oil-gas show, source-reservoir-cap rock assemblage, exploration

CLC Number:

TE112.41

JIN Wei, WANG Cheng-shan, WU Xin-he, LI Ya-lin. Condition of Hydrocarbon Accumulation in Tuonamu Area in Qiangtang Basin, Nor thern Tibet[J]. Xinjiang Petroleum Geology, 2006, 27(5): 530-534.

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