Geological condition analysis of shale gas and coalbed methane of Leping Formation in Well Quye1 of Pingle Depression
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    Abstract:

    To investigate the geological conditions and resources potential of shale gas and coalbed methane(CBM)of Upper Permian Leping Formation in Qujiang syncline in Pingle Depression,relevant data of Well Quye1 including drilling,logging,organic geochemistry,petrology,and reservoir characteristics were analyzed,and the CBM and shale gas of Leping Formation were studied by in-situ desorption. The results show that the accumulated thickness of shale and coal in Laoshan member of Leping Formation are 183 m and 7 m,respectively,and the gas logging reveals that the gas-bearing strata is 356 m,the average total organic carbon content of black shale in Leping Formation is 2.98%,and the average reflectance of vitrinite is 1.88%. The shale is in high-overmature thermal evolution stage in which dry gas generates dominantly and the measured desorbed gas content is 2.1 m3/t. The coal seam in Leping Formation of Well Quye1 is medium-rank coal with high quality,large thickness of single stratum and high gas content.It is found that the gas bearing capacity of shale reservoirs of Leping Formation in Pingle Depression increases with the buried depth,which shows the typical characteristics of shallow shale gas.

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CHEN Zhe, WANG Zhongpeng, LI Shangru. Geological condition analysis of shale gas and coalbed methane of Leping Formation in Well Quye1 of Pingle Depression[J]. Petroleum Geology and Recovery Efficiency,2019,26(4):50~55

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  • Online: September 24,2019
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