China Petroleum Exploration ›› 2020, Vol. 25 ›› Issue (1): 126-136.DOI: 10.3969/j.issn.1672-7703.2020.01.012

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Exploration practices of normal-pressure shale gas in the marginal transition zone of the southeast Sichuan Basin

He Xipeng1, Wang Yunhai2, Wang Yanqi2, Zhang Longsheng3, Wang Kaiming1, Gao Yuqiao1, Liu Ming1   

  1. 1 Research Institute of Exploration and Development, Sinopec East China Oil & Gas Company;
    2 Sinopec East China Oil & Gas Company;
    3 Research Institute of Petroleum Engineering Technology, Sinopec East China Oil & Gas Company
  • Received:2019-06-20 Revised:2019-11-14 Online:2020-01-15 Published:2019-12-31
  • Supported by:
     

Abstract: The Wufeng and Longmaxi Formations in the southeast part and the marginal transition zone of the Sichuan Basin are rich in shale gas resources at normal pressure, but face geological difficulties such as poor shale quality, low formation pressure coefficients, and large differences between maximum and the minimum horizontal principal stress. In order to achieve high and stable production, and efficient development, exploration has been carried out on normal pressure shale gas in the Nanchuan- Wulong area. Basic geological research methods, low-cost engineering technology and production management, etc. have been applied, with the result that understanding and practice based on ‘five optimizations’ has been established. The five optimizations are: optimized well locations; optimized trajectory in targets; optimized fractures; optimized cost control, and optimized well management. This program has proved that research on preservation conditions, sedimentary microfacies and tectonic stress is the essential base for selecting and optimizing sweet spot intervals and improving fracturing design, as well as developing innovative low-cost, fast, drilling and completion techniques. Effective fracturing engineering technology is also important for efficient development, and innovative ‘2+3’ management and operation is the guarantee for improving production quality and efficiency.

 

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