Analysis of reservoir conditions of shale gas in Middle Permian Wenbishan Formation in Fujian Province

This study is performed on the geological conditions of shale gas in Middle Permian Wenbishan Formation in Fujian Province. It is based on organic geochemistry, rock minerals and reservoir physical property after geology survey and drilling. The results indicate that kerogen is Ⅲ-type, organic carbon is usually between 1% to 2%, R_ran is between 3.76% to 4.91% in the shale of Wenbishan Formation, and the shale is in the mature stage. The content of brittle minerals is generally low. The shale has medium porosity and extremely low permeability, the micro and meso-pores constitute the major space for gas adsorption. In comparison with other typical studies, Wenbishan Formation in Fujian Province has material basis and buried condition for forming shale gas. It is preliminarily believed that Longyan in the central part of Fujian Province can be used as a key region for further work. In the next study, the effect of organic matter maturity and micro-pore structure on gas storage performance, and adsorption capacity, pore morphology as well as development characteristics of the shale should be enhanced, all of them could direct the exploration and development of shale gas in Fujian Province.