Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (2): 346-355.doi: 10.13278/j.cnki.jjuese.20170277

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Difference of Hydrocarbon Accumulation Between Hanging and Foot Wall of Half Graben Boundary Fault and Exploration Practice: A Case Study of X Sag in Huizhou Depression, Pearl River Mouth Basin, Northern South China Sea

Jiang Dapeng, He Min, Zhang Xiangtao, Peng Guangrong, Niu Shengli, Li Zhensheng   

  1. Shenzhen Branch of CNOOC Ltd., Shenzhen 518054, Guangdong, China
  • Received:2017-12-09 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by National Science and Technology Major Project of China During the "13th Five-Year" Plan Period(2016ZX05024-003)

Abstract: Half graben is a common sag pattern in the continental margin basins in East China, and its steep slope zone is one of the favorable oil and gas accumulating areas. Boundary faults play an important role in controlling the accumulation of oil and gas in steep slope zones. The internal structure of fault zone leads to different oil and gas accumulation models in footwall from those of hanging wall. Taking the X sag boundary fault in Huizhou depression of PRMB as an example, which is a long-term active fault developed with complete binary structure of fracture zone and fault core, we analyzed the control difference of the fault on oil and gas accumulation in the footwall and hanging wall. By means of qualitative and quantitative methods, we considered that the X fault developed continuous compact fault rocks with good lateral sealing in the main target layers; the vertical sealing of faults resulted in the difference of reservoir formation between the two pans; the migration of oil and gas into the reservoir of X fault footwall was also different from that of the hanging wall; because of the shielding of fault core, oil and gas were not directly charge in traps, but migrated to the footwall through connected sand bodies at the end of the fault or the transition zone in a manner similar to spiral staircase. In a word, the fault controlled structure in the X fault footwall has exploration potential, and which has been proved by drilling.

Key words: Huizhou depression, half graben, boundary fault, hanging and foot wall, fault zone internal structure, transfer zone migrate

CLC Number: 

  • P618.13
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