Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (3): 29-38.doi: 10.12108/yxyqc.20220303

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Main controlling factors and prediction of fractures in deep metamorphic buried hill reservoirs in Bohai Sea

ZHENG Hua, KANG Kai, LIU Weilin, GONG Min, CHEN Shanbin   

  1. Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2021-08-12 Revised:2021-12-03 Online:2022-05-01 Published:2022-05-12

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Abstract: Bozhong 13-2 area is the first deep metamorphic buried hill reservoir with 100 million-ton reserves discovered in Bohai Sea. Based on the data of drilled cores，thin sections, test and logging, the buried hill reservoir space，main controlling factors and distribution of fractures in the study area were expounded from the aspects of structural evolution，diagenesis and paleogeomorphic characteristics，which lays a foundation for the efficient development of the study area. The results show that： （1）Multi-stage tectonic movements are the main controlling factors of fracture formation，weathering， leaching and fracture filling are the main reasons for the vertical difference of reservoirs.（2）The coupling properties of structure tensor field and diffraction wave can effectively guide the prediction of reservoir on the plane in the study area， and the maximum likelihood attributes can be used to effectively predict the fracture trend in buried hills.（3）The fractures are well developed near the large faults on the plane， and the fractures developed in the weathered zone are better than those in the inner zone in the vertical direction. The reservoirs in the weathered zone of Bozhong 13-2 area can be divided into four types. The type Ⅰ reservoirs are the best and mainly located in the high parts of the structure，type Ⅱ reservoirs are mainly located at the waist of the structure，type Ⅲ reservoirs are mainly located in the structural wings near the faults, and type Ⅳreservoirs are the poorest and mainly located far away from the large faults.

Key words: weathering and leaching, structural tensor field, diffraction wave, deep layer, fracture, metamorphic buried hill, Bozhong 13-2 area, Bohai Sea

CLC Number: 

  • TE122.2
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