Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (5): 539-547.doi: 10.11743/ogg20090503

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Sequence styles and hydrocarbon accumulation effects of carbonate rock platform in the Changxing-Feixianguan formations in the northeastern Sichuan Basin

Chen Hongde, Zhong Yijiang, Hou Mingcai, Lin Liangbiao, Dong Guiyu, Liu Jiahong   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China
  • Received:2008-06-14 Online:2009-10-25 Published:2012-01-16

Abstract:

The Changxing and Feixianguan formations in northeastern Sichuan Basin can both be divided into two type-Ⅱ sequences:PSQ1,PSQ2,TSQ1 and TSQ2.The TSQ2 sequence can be subdivided into TST,EHST and LHST,and the rest can be divided into TST and HST.Controlled by fossil fractures,during Changxing-Feixianguan period,unique sedimentary pattern of platform alternating with basin and shoal alternating with topographic low occurred in the carbonate rock platform in northeastern Sichuan Basin.The fossil fractures and relative sea-level changes influenced the productivity and type of carbonate by controlling sedimentary pattern and water energy change,and further influenced the sequence structures of carbonate rocks.Hydrocarbon pooling elements developed in the sequence structure constitute the integrated source-reservoir-caprock assemblages of reef and shoal gas reservoirs in northeastern Sichuan Basin.

Key words: sequence style, hydrocarbon accumulation effect, Changxing Formation, Feixianguan Formation, northeastern Sichuan Basin

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