Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 36-48.doi: 10.12108/yxyqc.20230104

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Caprock evaluation and its reservoir control of different accumulation systems in central depression zone of Yinggehai Basin

FAN Caiwei1, JIA Ru2, LIU Bo2, FU Xiaofei2, HOU Jingxian1, JIN Yejun2   

  1. 1. Zhanjiang Branch of CNOOC (China) Co., Ltd., Zhanjiang 524057, Guangdong, China;
    2. Institute of Unconventional Oil & Gas, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
  • Received:2021-11-25 Revised:2022-03-20 Online:2023-01-01 Published:2023-01-06

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Abstract: Yinggehai Basin is an important natural gas exploration area in the South China Sea. Based on detailed analysis of typical gas reservoirs and gas-bearing structures of different accumulation systems in the central depression of Yinggehai Basin，the effectiveness and controlling factors of caprocks were evaluated，and the controlling effects of caprocks on natural gas accumulation were analyzed. The results show that: (1) In the ultra-shallow and shallow accumulation systems in the central depression zone of Yinggehai Basin，the sealing of caprocks is controlled by the caprocks，the diapir structure and the faults associated with the activity of the diapir structure. In the middle-deep accumulation system，under the background of abnormally high fluid pressure and the absence of faults，hydraulic sealing of caprocks is the key factor controlling differential enrichment of oil and gas. (2) The critical juxtaposition thickness of the brittle caprocks to maintain the sealing effectiveness is 86-98 m in the ultrashallow and shallow accumulation systems. The effectiveness of the caprocks in the middle-deep accumulation system can be evaluated by the hydraulic fracturing pressure coefficient. When the value is greater than 1，it means that the caprocks have ruptured or have a strong risk of hydraulic fracturing. (3) From the overall view of the central depression，hydraulic fracturing induced by overpressure is the fundamental cause of sealing failure in mid-deep caprocks. Deep natural gas migrates to shallow layer through hydraulic fracturing channel and finally to the ultra-shallow reservoir through the faults. Therefore，under the condition of sufficient gas source，ultra-shallow and shallow gas reservoirs are mainly distributed at the top of the diapir，while middle-deep gas reservoirs are mainly concentrated in the diapir wing and slope areas.

Key words: caprock, overpressure, breakthrough pressure, fault, hydraulic fracturing, reservoir control, central depression zone, Yinggehai Basin

CLC Number: 

  • TE122.2
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