Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (2): 59-67.doi: 10.12108/yxyqc.20230206

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Fluid pressure field building process and its petroleum geological significance of Paleogene Shahejie Formatiom in Bonan sag, Jiyang Depression

ZHENG Bin1, DONG Ao1, ZHANG Yuanzhi2, ZHANG Yi1, SU Shan3, ZHANG Shichao1, FAN Jinjin1, LUO Yinshan2   

  1. 1. No. 2 Gas Production Plant, PetroChina Qinghai Oilfield Company, Dunhuang 736200, Gansu, China;
    2. POLY-GCL Petroleum Group Holdings Limited, Beijing 100017, China;
    3. No. 1 Oil Production Plant, PetroChina Qinghai Oilfield Company, Dunhuang 736200, Gansu, China
  • Received:2022-05-22 Revised:2022-06-16 Online:2023-03-01 Published:2023-03-07

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Abstract: The fluid inclusions in shale and tight sandstone of Paleogene Shahejie Formation in Bonan sag of Jiyang Depression were tested for Paleopressure, the fluid pressure evolution process was restored, and its petroleum geological significance was discussed. The results show that:(1) The third member of Shahejie Formation(Es3) in Bonan sag experienced four pressure field reconstruction processes in Guantao Formation and subsequent sedimentary periods. The duration of each pressure field reconstruction is 3-4 Ma, showing the characteristics of low sequence episodic pattern.(2) Different from the low sequence episodic pressure field building process of Es3, the Es4 has a high threshold for pressure field reconstruction under the sealing of overlying gypsum rocks. Two pressure field reconstruction processes occurred during the sedimentary period of Dongying Formation and the end of Guantao Formation, showing the characteristics of high sequence episodic pressure field.(3) The low sequence episodic pressure field building process of Es3 i ndicates an open fluid environment and strong acid dissolution. The physical properties of Es3 r eservoir with low sequence episodic pressure field are higher than those of the upper Es4 r eservoir with high sequence episodic pressure field. The hydrocarbon source rocks of Es3 n ot only discharge a large number of hydrocarbons, but also contains hydrocarbons in its own reservoir space, so as to form enrichment areas of conventional oil and shale oil.

Key words: low sequence episodic pattern, high sequence episodic pattern, fluid pressure field building, the third member of Shahejie Formation, the upper fourth member of Shahejie Formation, Paleogene, Bonan sag, Jiyang Depression

CLC Number: 

  • TE122.1
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