Oil & Gas Geology ›› 2013, Vol. 34 ›› Issue (6): 781-789.doi: 10.11743/ogg20130610

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

Li Minggang1, Wu Jingfu1, Wu Keqiang1, Liu Pengbo2, Yang Haifeng2   

  1. 1. Research Institute of CNOOC, Beijing 100027, China;
    2. Exploration and Development Research Institute of Bohai Oilfield, Tianjin Branch of CNOOC Ltd, Tianjin 300452, China
  • Received:2013-02-08 Revised:2013-06-25 Online:2013-12-08 Published:2014-01-04

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

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