Pooling Conditions of non Marine Shale Gas in the Sichuan Basin and Its Exploration and Development Prospect
详细信息
- 责任者：Zhu Tong(Sinopec Exploration and Production Research Institute ; Beijing 100083 ; China) ; Bao Shujing
- 刊名：Natural Gas Industry
- 出版年：2012
- 卷期：32(9)
- 页码：p.16-21
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
In North America, shale gas plays are dominated by organic rich marine shales. In contrast, shale gas plays are predominated by organicrich shales of continental facies and transitional facies in the major petroliferous basins in China. Nonmarine shale gas plays will be new frontiers for exploration and development of unconventional gas in the future in China. In view of this, field outcrop observation, core observation and test data were integrated to study the pooling conditions of shale gas, gasbearing properties and producibility of the nonmarine shales in the Sichuan Basin. The nonmarine shales in the Upper Triassic Xujiahe and the Lower Jurassic Ziliujing formations in the Sichuan Basin are characterized by extensive distribution, great thickness, high organic abundance, good sealing conditions, and high content of brittle minerals, which are favorable for shale gas pooling and hydraulic fracture stimulation. Through old well review and exploratory drilling, significant gas shows have been obtained and industrial gas flows have been tested in the Ziliujing Formation shales in the Jiannan and Fuling areas in the eastern Sichuan Basin and the Yuanba area in the northeastern Sichuan Basin, as well as the Xinchang area in the Xujiahe Formation in the western Sichuan Basin. It is believed that the nonmarine shales in the Sichuan Basin have comparable conditions for gas pooling with the marine shales in North America, and even are better than the Lewis Shale of transitional facies in the San Juan Basin, thus their shale gas exploration potential is great. The following play fairways were preliminarily selected: the Langzhong Pingchang and Santai Guang’an areas in the Central Sichuan Basin and the Fuling Changshou area in the southeastern Sichuan Basin favorable for shale gas exploration in the Ziliujing Formation; the Xiaoquan Xinchang area in the western Sichuan Basin and the Santai Guang’an area in the Central Sichuan Basin favorable in the Xujiahe Formation.