Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (3): 106-116.doi: 10.12108/yxyqc.20240310

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Spatial-temporal differential evolution model and reservoir control effect of Cenozoic extensional and strike-slip superimposed faults in Bodong Sag

DONG Rou1,2, LI Kun2, YIN Jihang2, XUE Yuheng2, JIANG Tao3, XU Guosheng2   

  1. 1. No. 11 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang 745000, Gansu, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    3. Tianjin Branch of China National Offshore Oil Corporation, Tianjin 300452, China
  • Received:2022-12-17 Revised:2023-03-14 Online:2024-05-01 Published:2024-04-30

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Abstract: Based on 3D seismic interpretation, the spatial-temporal differential evolution characteristics and reservoir control effect of Cenozoic extensional and strike-slip superimposed faults in Bodong Sag were systematically analyzed through structural profile restoration. The results show that:（1）Extensional and strike-slip superimposed faults with NNE trending as the main stem, NE trending as the derivative, and NW trending as the superposition, were widely developed in Cenozoic in Bodong Sag, and these faults can be divided into two types: strong extensional and weak strike-slip faults, strong strike-slip and weak extensional faults. The superimposed fault system has obvious characteristics of deep and shallow stratification and north-south segmentation. Vertically, the Paleogene mainly developed strong extensional and weak strike-slip faults, which are large and sparse, and the Neogene-Quaternary mainly developed strong strike slip and weak extensional faults, which are small and dense. On the plane, there are differences in the structural combination styles of the same fault in different segments.（2）The evolution of the Cenozoic extensional and strike-slip superimposed faults in the study area are manifested as early strong and late weak activity of the northern faults, inherited and continuous development of the central faults, and early weak and late strong activity of the southern faults. The evolution model can be divided into three stages:initial fault depression stage（Kongdian Formation-Sha 4 sedimentary period）, strong fault depression stage （Sha 3 member-Dongying Formation sedimentary period） and strike-slip depression stage （Guantao Formation-Pingyuan Formation sedimentary period）. In the initial fault depression stage, NNE-NE trending strong extensional and weak strike-slip faults superimposed, dominated by NE trending strong extensional and weak strike-slip faults, with NW trending pre-existing fault activation, dividing the depression. In the strong fault depression stage, NNE-NE trending strong extensional and weak strike-slip faults superimposed, dominated by NNE trending strong extensional and weak strike-slip faults, with NW trending fault activity weakened or stopped. In the strike-slip depression stage, NNE trending strong strike-slip and weak extensional faults superimposed, and the faults did not control the sedimentation, but has adjustment on stratigraphic distribution.（3）The development and evolution of the extensional and strike-slip superimposed faults in the study area are closely related to hydrocarbon accumulation, with the overall characteristics of early extensional faults control source, late strikeslip faults control migration, and multi-stage superimposed faults control traps. The eastern slope zone is a favorable area for hydrocarbon migration and accumulation.

Key words: extensional and strike-slip superimposed fault, fault evolution, hydrocarbon migration and accumulation, fault control reservoir, Shahejie Formation, Dongying Formation, Cenozoic, Bodong Sag

CLC Number: 

  • P618.13
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