断陷盆地陡坡带构造样式与油气聚集—以渤海湾盆地辽河坳陷西部凹陷陡坡带为例

doi:10.11743/ogg20090514

Abstract

Abstract:

Study of structural evolution,subsidence history,and fault activity intensity of the eastern steep slope zone of the western sag in the Liaohe Depression of the Bohai Bay Basin reveals three structural styles:1)positive inverse structure,2)extensional fault structure,and 3)buried-hill drape structure.The evolution history of the study area can also be divided into two types:the positive inverse evolution and extensional structural evolution.Study of subsidence history indicates a gradual subsidence from north to south.Quantitative calculation of the fault growth index shows various fault activity intensities in different parts of Taian-Dawa area with the strongest intensity in Dawa.The Well Zhaogu-1 in Dawa tested high oil and gas flows from the Archeaozoic buried-hill.It is therefore suggested that a study of fault evolvement and a further analysis of fracture distribution are the key to oil and gas discoveries in deep of buried-hill and provide clues to the exploration of buried-hill reservoirs near hydrocarbon kitchen in steep slope zones.

Key words: structure evolution, steep slope zone, structure type, fault depression, Liaohe Depression, Bohai Bay Basin

CLC Number:

Mu Deliang, Meng Weigong, Li Cheng, Li Xiaoguang, Liu Jinyun, Wang Zhanzhong. Structural style and hydrocarbon accumulation in the steep slope zone of faulted basin—an example from the western sag of the Liaohe Depression,the Bohai Bay Basin[J]. Oil & Gas Geology, 2009, 30(5): 635-642.

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Structural style and hydrocarbon accumulation in the steep slope zone of faulted basin—an example from the western sag of the Liaohe Depression,the Bohai Bay Basin

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