Evolution of Faulted Lacustr ine Basin and Hydrocarbon Accumulation in Huimin Sag

Abstract

Abstract: Shahejie formation of Paleogene is the most important source rock in Huimin sag which is divided into sub-sags of Linnan, Zizheng, Yangxin, Lizezheng. The differences of these sags' depositions lead to their different environments and potentials for hydrocarbon generation. Linnan sub-sag is in big thickness of deposition, which is favorable for source rock evolution such as Sha-3 and Sha-4 sections, belonging to stable subsiding or deep buried type, around which there exist large scale hydrocarbon accumulations; while Xinyang, Zizheng and Lizezheng are in relatively shallow buried depth due to late slowing subsiding of pelitic rock deposits in certain depth of Sha-3 and Sha-4 sections, belonging to gradually rising and mid-shallow buried type, and their slower hydrocarbon-generation evolutions allow scattered low mature or immature hydrocarbons to be found around them. It is the episodic and multi-cycle features of sedimentation and evolution in Linnan sub-sag that form multi-set source rocks with rich organic matters. The correlation among the oil sources shows that producing crude oil just comes from Sha-3 source rock. The upper section of Sha-4 source rock is in deep buried depth and high maturity, but related oil-gas reservoirs are not found up to now. Hence, the upper section of Sha-4 source rock should be as an important target for petroleum exploration in future here.

Key words: Huimin sag, evolution, hydrocarbon generation, source rock

CLC Number:

TE112.11

ZHU Guang-you, JIN Qiang, ZHANG Shui-chang, ZHANG Lin-ye, LI Jian. Evolution of Faulted Lacustr ine Basin and Hydrocarbon Accumulation in Huimin Sag[J]. Xinjiang Petroleum Geology, 2006, 27(1): 27-30.

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