Prediction of shale gas preservation conditions by pre-stack geophysical technology: A case study of the shale gas reservoirs in the Jiaoshiba Block of the Sichuan Basin

被引：0
|
作者：
Zhang D. [1 ]
Sun W. [1 ]
Li S. [1 ]
Hao Y. [1 ]
Liu L. [1 ]
机构：
[1] Sinopec Petroleum Exploration and Production Research Institute, Beijing
来源：
Natural Gas Industry | 2020年 / 40卷 / 06期
关键词：
Evaluation method; Formation pressure prediction; Fracture prediction; Fuling Shale Gas Field; Preservation conditions; Preservation indicator; Shale gas; Sichuan Basin;
D O I：
10.3787/j.issn.1000-0976.2020.06.004
中图分类号：
学科分类号：
摘要：
In recent years, the immense exploration potential of shale gas in the Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation in the eastern Sichuan Basin has been further confirmed especially when great breakthroughs were realized in the Fuling Shale Gas Field of the Sichuan Basin. However, how to apply geophysical technologies to evaluate shale gas preservation conditions more accurately and effectively is a burning problem in shale gas exploration and development in this area. From the perspective of fracture development degree and formation pressure, this paper first applied the fracture prediction technology based on pre-stack azimuthal anisotropy to predict high-angle fractures on the basis of pre-stack seismic data. Then, the pressure prediction technology based on pre-stack P-wave impedance inversion was used to describe the spatial distribution characteristics of formation pressure. Finally, both of them were combined to establish a new parameter for evaluating shale gas preservation conditions, i.e., preservation indicator. In this way, a set of new method that can be used to effectively predict shale gas preservation conditions was developed. This new method was used to evaluate the shale gas preservation conditions in the Wufeng-Longmaxi Fms in the Jiaoshiba Block of Fuling Shale Gas Field, and the prediction results of preservation indicator were compared with the production data of gas wells, which demonstrated that the preservation indicator agreed well with the AOF of a shale gas well, making up the previous mismatch between a low-productivity well and its AOF. In conclusion, the predicted preservation indicator is in line with the production data of gas wells, indicating that this new method is valid and reliable in evaluating shale gas preservation conditions. © 2020, Natural Gas Industry Journal Agency. All right reserved.
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页码：42 / 49
页数：7
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