The Gas Content of Continental Yanchang Shale and Its Main ControllingFactors:A Case Study of Liuping-171 Well in Ordos Basin
Received date: 2013-03-27
Revised date: 2013-05-31
Online published: 2014-02-10
The direct desorption method and indirect method were used for calculating the free gas content,adsorbed gas content and total gas content of Chang 7 Shale,Chang 8 Shale and Chang 9 Shale in Liuping-171 Well respectively.By analyzing the mineralogy,geochemical characteristics,pore structure and pore volume of Yanchang shale,the main controlling factors of gas content had been confirmed,which had been analyzed qualitatively or semi-quantitatively.The results show that,the gas content of Yanchang shale is dominated by adsorbed gas content.In particular,the gas content of Chang 7 shale is 3.71-6.26m3/t of which the free gas content is 22.53%-35.29%,with an average of 29.22%.The gas content of Chang 8 shale is 3.68-5.19m3/t of which the free gas content is 24.43%.The gas content of Chang 9 shale is 5.57-7.80 m3/t of which the free gas content is 31.64%.With the increase of organic carbon content,the specific surface area available for gas adsorption increases accordingly,therefore,the adsorbed gas content increases.The organic carbon content shows positive correlation with the total pore volume,moreover,high maturity promoted the development of organic nanopores which caused the increase of shale gas reservoir space.Hence,TOC and vitrinite reflectance show positive correlation with the gas content respectively.Different from marine shale,the source of quartz in continental Yanchang shale is the detrital material of terrigenous origin,therefore,the quartz content is negatively correlated with gas content.The clay content has weak positive correlation with the gas content,which mainly manifested as the adsorption capacity of illite smectite mixed layer clay and illite for shale gas.The correlation between gas content and micropore volume is not obvious.While the motion state of methane molecules changed because of which the thermodynamic state changed,the macropore and mesopore with a greater pore size and pore throat are easier to be filled by methane molecules,therefore,the macropore and mesopore volume show positive correlation with the gas content.
ZENG Wei-te，ZHANG Jin-chuan，DING Wen-long，WANG Xiang-zeng，ZHU Ding-wei，LIU Zhu-jiang . The Gas Content of Continental Yanchang Shale and Its Main ControllingFactors:A Case Study of Liuping-171 Well in Ordos Basin[J]. Natural Gas Geoscience, 2014 , 25(2) : 291 -301 . DOI: 10.11764/j.issn.1672-1926.2014.02.291
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