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Sedimentary mode and reservoir properties of mud shale series of strata in Xiangzhong-Xiangdongnan depression,Hunan,China

XU Fang-hao;QIAN Jin;YUAN Hai-feng;XU Guo-sheng;LIANG Jia-ju;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology;  
In the Middle Yangtze region,there mainly develop four set of mud shale series of strata in Devonian-Permian System of the Xiangzhong-Xiangdongnan depression.Among them,the mud shale of the Devonian Shetianqiao Formation and Qiziqiao Formation mainly develops in the marine basin and that of the Permian Longtan Formation as well as the Carboniferous Ceshui Formation mainly develops in the littoral-swamp facies of the sea and land interaction environments.This paper comprehensively analyzes and studies the reservoir properties of the shale series of strata in the middle of Hunan and the southeast of Hunan using X-ray diffraction technique,scanning electron microscopes technology and adsorption isotherm technique,and considering the sedimentary background.The study result shows that in the shale series of strata in the middle of Hunan and the southeast ofHunan,the contents of quartz,carbonate minerals and clay minerals are 29.4%,21.2%and 44.6%,respectively.The pore types include well-connected hack pore,organic matter pole,biological cavity pole,and poor-connected corrosion poles.The total pore throat relationship is good.The adsorption capacity Langmuir volume in the middle of Hunan is 1.72cm3/g on an average and that in the southeast of Hunan is 1.775 cm3/g on an average.Compared with the Barnett shale reservoir properties,this paper indicates that the mud shale series of strata in the middle and the southeast of Hunan have a good gas-bearing property and reservoir properties and great exploration and development potentials.
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