Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (3): 120-128.doi: 10.12108/yxyqc.20250311

• PETROLEUM EXPLORATION • Previous Articles    

Characteristics and reservoir control of the strike-slip salt arch belt of Shahejie fourth Member Formation of Paleogene system in Laizhou Bay Depression，Bohai Bay Basin

CHEN Huaiyi, LI Long, BAI Bing, YUE Junpei, KANG Rong, ZHANG Xingqiang   

  1. Bohai Petroleum Research Institute, Tianjin Branch of CNOOC, Tianjin 300459, China
  • Received:2024-07-30 Revised:2024-09-05 Published:2025-05-10

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Abstract: Based on the interpretation results of new 3D seismic data in Kenli 17-1 tectonic area of Laizhou Bay Depression，the distribution，formation mechanism，evolution model and reservoir formation significance of strike-slip salt arch belt are studied. The results show that：（1）The salt sources of the fourth member of Shahejie Formation of Paleogene in Laizhou Bay Depression are mainly divided into two types：deep hydrothermal and terrigenous sources. The supervised KNN model multi-attribute recognition method is used to describe the shape boundary of the salt arch，and the salt structure is identified to be almost north-south distribution. By intercepting the seismic sections in the south，middle and north，the salt structure can be divided into three types：integrated contact non-puncturing type，hidden puncturing type and non-integrated contact puncturing type.（2）The strikeslip salt arch belt in the study area has a three-part genetic pattern of“strike-slip - inversion-salt arch”. Under the coupling and superposition of gravity sedimentary differential load and strike-slip extrusion，the salt arch structure forms a north-south shape difference，and the salt structure mainly goes through three main evolution stages：development stage，maturity stage and re-active stage（. 3）The strike-slip salt arch belt can accelerate the maturation of the overlying source rocks，reduce the hydrocarbon expulsion threshold，and have a good capping effect，and control the migration and accumulation of oil and gas. The formation of the third member and below of the Paleogene Shahejie formation in the south of the study area，Keli 17-1，mostly formed salt wall side sealing reservoirs. Lithologic updip pinch-out or tectono-lithologic reservoirs are mostly formed in the deep Dongying Formation，the first Member and the second Member of the Paleogene Shahejie formation in Kenli 11-2 area in the north of central China，and punctured graben-fault-block reservoirs are mostly formed in Guantao Formation and Minghuazhen Formation.

Key words: strike-slip salt arch, hydrothermal origin, origin of terrigenous input, promote source rock prematurity, reduce the hydrocarbon expulsion threshold, oil and gas capping action, reservoir control, fourth member of Shahejie Formation, Paleogene, Laizhou Bay Depression, Bohai Bay Basin

CLC Number: 

  • TE122
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