渤海西部孔店组—沙河街组盆地构造特征及形成动力机制

doi:10.11743/ogg20130610

Abstract

Abstract: Based on the overall study and comparative analysis,the theory of oilfield structural analysis was used to understand the structure features and dynamic mechanism of basin formation during the deposition of the Kongdian and Shahejie formations in Western Bohai Sea,so as to reveal the distribution of source rocks in the Kongdian and Shahejie formations and guide play evaluation and exploration target selection.Basin architecture was controlled by basement structure,and tectonic deformation was different in the east and west due to the difference of crystalline basement types.In addition,the tectonic deformation was influenced by two pre-existing NE-NNE-trending and NW-NWW-trending conjugate basement faults,resulting in the E-W zonation and N-S segmentation in the west part while E-W segmentation and N-S zonation in the east part.Structure features in different deposition periods of Kongdian formation and Shahejie formation vary largely,showing an evolutionary sequence of downwarp-fault depression-fault depression and fault-downwarp depression(depression).And the structural deformation during despotism the Kongdian and Shahejie formations in western Bohai Sea was controlled by vertical extensional stress field induced by mantle diapir and uplift.Tectonic deformation in the east part was mainly controlled by the near SN extensional stress field,while that in the west part was controlled by the superimposed NW-SE and near SN extensional stress fields.

Key words: oilfield structural analysis, structure feature, dynamic mechanism, Kongdian Formation, Shahejie Formation, western Bohai Sea

CLC Number:

TE121.1

Li Minggang, Wu Jingfu, Wu Keqiang, Liu Pengbo, Yang Haifeng. Structure features and dynamic mechanism of basin formation in Kongdian-Shahejie periods in western Bohai Sea[J]. Oil & Gas Geology, 2013, 34(6): 781-789.

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Structure features and dynamic mechanism of basin formation in Kongdian-Shahejie periods in western Bohai Sea

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