Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (3): 127-136.doi: 10.12108/yxyqc.20240312

• PETROLEUM EXPLORATION • Previous Articles    

Tectonic evolution and hydrocarbon accumulation in northern Chenjia fault zone，Liaohe Depression

XI Zhibo1, LIAO Jianping1,2, GAO Rongjin3, ZHOU Xiaolong3, LEI Wenwen3   

  1. 1. School of Earth Sciences and Spatial Information Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China;
    2. Institute of Unconventional Oil and Gas Development, Chongqing University of Science and Technology, Chongqing 401331, China;
    3. PetroChina Liaohe Oilfield Company, Panjin 124010, Liaoning, China
  • Received:2023-08-07 Revised:2023-09-05 Published:2024-04-30

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Abstract: The Chenjia fault zone in Liaohe Depression is rich in oil and gas resources and is one of the important oil and gas bearing zones in the west sag of Liaohe Depression. Based on structural evolution, combined with sand-box physical simulation experiments, the deformation mechanism and evolution process of Chenjia fault zone in Liaohe Depression were analyzed, and its control effects on hydrocarbon accumulation were analyzed. The results show that:（1）The Chenjia fault zone in Liaohe Depression has the evolution characteristics of segmented development and gradually becoming late from north to south during the activity period. Under the influence of fault segmentation, Chenjia fault zone mainly develops compression-torsion back-thrust and strike-slip com‐pression-torsion structural styles.（2）The results of physical simulation experiments show that under the influence of compression-torsion, compression-torsion en echelon small faults were first formed at the hanging wall of Taian-Dawa fault. As the displacement increases, the small faults were gradually connected, and finally the through-strike-slip fault zone, namely the Chenjia fault zone, was formed.（3）Taian depression is a depression formed by the superposition of multi-stage tectonic deformation in Cenozoic, and the main hydrocarbon source rock series is developed in deep layers, which has the material basis for the development of large-scale oil and gas reservoirs. The analysis results of drilling cores at the edge of the depression show that the TOC value of the source rock is 4.79%, and the Ro value is 0.3%-0.4%, belonging to good source rocks. It is speculated that source rocks in the depression center have larger thickness and bettwe quality. The fault nose structure is developed at the footwall of the central and northern Chenjia fault zone, which has the characteristics of dual source hydrocarbon supply in Chenjia depression and Taian depression, and is a favorable zone for oil and gas accumulation.

Key words: tectonic evolution, structural physics simulation, hydrocarbon accumulation, strike-slip compressiontorsion, compression-torsion back-thrust, dual source hydrocarbon supply, fault nose structure, Paleogene, Chenjia fault zone, Liaohe Depression

CLC Number: 

  • TE121.2
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