Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (6): 98-109.doi: 10.12108/yxyqc.20240610

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Main controlling factors for the high yield of tight oil in the Jurassic Da’anzhai Section in the western area of Gongshanmiao, Sichuan Basin

YAN Xueying1, SANG Qin1, JIANG Yuqiang1,2, FANG Rui1, ZHOU Yadong1, LIU Xue3, LI Shun4, YUAN Yongliang1   

  1. 1. School of Earth Science and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. CNPC Reservoir Evaluation Laboratory, Chengdu 610500, China;
    3. Furisheng(Chengdu)Technology Co., Ltd., Chengdu 610056;
    4. Chuanzhong Oil and Gas Mine of CNPC Southwest Oil and Gas Field Company, Suining 629000, Sichuan, China
  • Received:2023-11-29 Revised:2024-03-12 Online:2024-11-01 Published:2024-11-04

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Abstract: On the basis of the understanding of the characteristics of tight limestone reservoirs in the Da’anzhai Formation in the western area of Gongshanmiao of Sichuan Basin，the development scale of the fracture system was identified and graded by using the methods of thin section identification，logging response，and SMI And the main controlling factors of tight oil and high yield in the Da’anzhai Member were studied. The results show that：（1）The limestone of the Da’anzhai section is divided into two types of reservoirs：thick-bedded limestone and thin-bedded limestone. The limestone reservoir has an average porosity of 1.2% and an average permeability of 0.05×10-3 μm2，which is a very low porosity and low permeability reservoir，and dissolution is an important factor in the formation of reservoir properties，and the reservoir space is mainly secondary dissolved pores and micro-fractures.（2）According to the size of the fault，the fault layer and the fault distance on the plane，the fault is divided into primary，secondary and tertiary. Among them，the Da’anzhai section is mainly affected by the primary and secondary faults，the fractures associated with faults can effectively improve the physical proper ties of the reservoir.（3）It is concluded that favorable facis development and t relationship of fault-reservoir con figuration are the control factor to determine the high yield of the reservoir. There are two high-yield models： “thin limestone first-level fracture”and“thick limestone first-level/second-level fracture”.

Key words: fracture system, shell limestone, structural fracture, diagenesis fracture, favorable facies, relation ship of fault-reservoir configuration, Da’anzhai Section, Jurassic, western area of Gongshanmiao, Sichuan basin

CLC Number: 

  • TE122
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