Rich and quality shale gas reservoirs have been found in the Lower Silurian Longmaxi strata in the Changning–Weiyuan area, southern Sichuan Basin, which was identified as the shale gas national demonstration zone in 2012. In order to provide useful experiences for shale gas E&P in China, we summarized the main technologies and achievements in every step of the E&P process in this demonstration project, hoping to lay a robust foundation for the further shale gas E&P in the Sichuan Basin. The following findings were obtained. (1) Over the past one decade, this project has gone through three stages of favorable layers & targets evaluation, pilot tests and project construction, and has come to a new stage of rapid development. (2) Designs, technologies and single-well productivity have been continuously improved because this project construction has undergone three rounds of optimization and adjustment: the first round of main technologies adopted for those production gas wells strictly according to the previous development plan design; the second overall optimal round of design and engineering schemes; and the third all-around promotion round of integrated geological & engineering technologies. (3) Up till now, this project has achieved a commercial gas flow with a shale gas productivity of 25×108 m3 per year and obtained effective development methods and measures for shale gas reservoirs less than 3 500 meters in depth. In conclusion, with this project successfully constructed, the shale gas resources has been evaluated and favorable targets have been clarified in the southern Sichuan Basin, where commercial shale gas production will soon be achieved.
谢军. 长宁—威远国家级页岩气示范区建设实践与成效[J]. 天然气工业, 2018, 38(2): 1-7.
Xie Jun. Practices and achievements of the Changning–Weiyuan shale gas national demonstration project construction. NATURAL GAS INDUSTRY, 2018, 38(2): 1-7.