湖北省秭归盆地北缘牛蹄塘组页岩气储层特征及保存条件

Characteristics and Preservation Conditions of Shale Gas Reservoir in Zigui Basin of Hubei Province

秭归盆地牛蹄塘组页岩厚度较大,地表出露较好。根据牛蹄塘组页岩样品的测试结果,分析其有机化学特性、储层特征,从而探讨其生气、储气的保存条件和影响因素,为该区页岩气资源勘查提供新依据。研究表明:牛蹄塘组页岩厚度大,具西厚东薄的特点,有机碳含量高,生气条件较好;无机孔隙发育、有机质孔隙不发育,脆性矿物含量高,储气条件一般,但利于后期压裂改造。区内断裂发育,褶皱变形强烈,构造保存条件较差。

In the Zigui basin,the shale thickness is large and the surface is better. In this paper,according to the Niutitang formation shale test results of sample analysis,the organic chemical characteristics and reservoir characteristics are analyzed,thus the preservation conditions and influencing factors of gas generating and gas storage are discussed,and a new basis for the exploration of shale gas resources in this area is provided. The results showed that the thickness of shale in the group was large,with the characteristics of the thickness of the west thickness and the high content of organic carbon. The inorganic pore development,the organic matter pore does not develop,the brittle mineral content is high,the gas storage condition is general,facilitate the later fracturing reconstruction. The tectonic development in the region,the fold deformation is strong,the tectonic preservation condition is poor.