Typical shale gas reservoirs in USA and enlightenment to exploration and development

Through the comparative studies on the geological parameters of typical shale gas reservoirs, according to lithologic combination, reservoir pressure and shale mineral composition, the typical shale gas reservoirs in USA are divided into three categories: the layered ordinary-overpressure siliceous shale type (taking Barnett as the representative), the layered super-high pressure siliceous-calcium shale type (taking Haynesville as the representative) and the interbedded super-high pressure calcium shale type (taking Eagle Ford as the representative). Compared to those in USA, the shale gas reservoirs in the Sichuan Basin and the surrounding area are featured by multiple fields, layers and types. They are also divided into three categories: layered ordinary-low overpressure siliceous shale type on basin margin (taking Pengshui and Zhaotong Wufeng-Longmaxi Formation shale as the representative), layered super-high pressure siliceous shale type inside basin (taking Fuling, Changning and Fushun Wufeng-Longmaxi Formation shale as the representative), interbedded super-high pressure calcium-clay shale type inside basin (taking Fuling and Yuanba Da'anzhai segment as the representative). Learned from the successful exploration and development experience of similar shale gas reservoirs in USA, targeting to carry out development and engineering technology research and economic evaluation of different type shale gas reservoirs, this is the key to realize the effective development of multiple type shale gas reservoirs in China.