Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (5): 59-69.doi: 10.12108/yxyqc.20250506

• PETROLEUM EXPLORATION • Previous Articles    

Characteristics and reservoir control of Cenozoic tectonic evolution of Nanpu Sag，Bohai Bay Basin

ZHAO Baoyin1, YANG Xiaoli1, XU Yingxin2, MENG Lingjian1, CUI Zixuan3, WANG Fanglu1, LIU Jianlun2, YU Fusheng3   

  1. 1. Exploration and Development Research Institute, Jidong Oilfield Company, CNPC, Tangshan 063004, Hebei, China;
    2. Jidong Branch of Geological Research Institute of Geology, GRI, BGP lnc., CNPC, Zhuozhou 072751, Hebei, China;
    3. Department of Earth Sciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2024-12-02 Revised:2025-01-17 Published:2025-09-06

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Abstract: Based on the analysis of the latest 3D seismic data，combined with the evidence of regional geological background，unconformity surface and paleontological fossils，sedimentary period（fault depression stage）tectonic episodes of Paleogene Shahejie Formation in Nanpu Sag were redivided from two aspects：the development characteristics of synsedimentary faults and migration rule of sedimentary centers，and its control effects on reservoir was studied. The results show that：（1）The fourth member of Paleogene Shahejie Formation（Es4）in Nanpu Sag mainly distribute in the eastern part of the sag. Es3 is angular unconformity contact with underlying Es4 and overlying Es2，and Es1 is integrated contact with Es2.（2）In the study area，Cenozoic experienced six stages of tectonic evolution，such as three episodes of fault depression（Paleogene Es4，Es3，Es1-Es2），faultdepression conversion（Paleogene Ed），thermal depression（Neogene Ng），and depression fault（Neogene Nm）. The tectonic stress field rotated clockwise from NW-SE to near SN，and the superimposion of extension and strike-slip structures formed a tensional-torsional deformation zone. The sedimentary center controlled by the synsedimentary fault exhibits the migration law of SE-NW-SEE.（3）Cenozoic tectonic evolution of the study area controls the development of source rocks，reservoirs and traps. Four sets of main source rocks，such as Es4， Es3，Es1 and Ed3 are developed，and development models of sand body can clasified as three types：“conversion slope”“conversion nose-bulge”and“fault trough-slope break”. Faults and traps are across developed，and three sets of accumulation combinations are developed vertically，which constitute a multi-layer superimposed composite oil and gas accumulation zone dominated by layered oil and gas reservoirs. Laoyemiao fan body，Gaoliu fault downthrown wall and Nanpu No. 1 fault，Nanpu No. 2 fault and Nanpu No. 4 slope break belt faulted anticline，fault nose structural trap are prioritized as the next-phase exploration targets.

Key words: tectonic evolution, episodic tectonic movement, synsedimentary fault, faulted anticline, fault nose structure, Cenozoic, Nanpu Sag, Bohai Bay Basin

CLC Number: 

  • TE121.1+1
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