Oil & Gas Geology ›› 2013, Vol. 34 ›› Issue (2): 242-247.doi: 10.11743/ogg20130216

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Tectonic evolution and hydrocarbon accumulation in the east part of Shaleitian Sailent,western Bohai Sea

Shi Wenlong, Zhang Zhiqiang, Peng Wenxu, Wang Baoquan, Guo Tao   

  1. Tianjin Branch of CNOOC China Ltd., Tianjin 300452, China
  • Received:2012-03-20 Revised:2013-03-09 Online:2013-04-28 Published:2013-05-02

Abstract:

Shaleitian salient is an exposed paleo-buried hill underwent long-term weathering and erosion with several structural highs.It is separated into the east part and the west part by early strike-slip faults.Several hundred-million-tons of OOIP have been discovered in the east part of the salient.Under the control of the early tectonic strike stress in basement,four NE-trending strike-slip faults were developed in the east part of the salient,affected by which the ancient channels were formed on the basement surface.The Neogene was draped on the buried hill.Due to the impact of later dextral strike-slip faulting,a series of NNE-trending or nearly EW-trending faults were formed in the Neogene.These en echelon faults have significant control on the accumulation of hydrocarbon in the area.The paper establishes the hydrocarbon accumulation pattern of the Neogene and determines the hydrocarbon exploration potential by analyzing the structural evolution characte-ristics of the east part of the salient,providing theoretical support for the progressive exploration and reserve growth.

Key words: en echelon fault belt, tectonic evolution, hydrocarbon accumulation pattern, Neogene, Shaleitian Salient, western Bohai Sea

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