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- W2893612380 abstract "Abstract In order to clarify the influence of laminae on the gas storage capacity of the delta−front shales, this study separates the bright laminae with the dark one in the six samples from the Lower Permian Shanxi Formation, Xiasiwan Area, Ordos Basin. Various analyses are subsequently implemented, including He−porosity test, XRD test, TOC test, N2 adsorption analysis, rock−eval pyrolysis analysis, free gas test and isothermal adsorption test. It is demonstrated that the dark laminae are muddy, while the bright ones are silty. Moreover, the total gas storage capacity reaches maximum when the bright laminae account for a proportion of about 46%. The free gas storage capacity increases with porosity, but decreases with water saturation, which is negatively correlated with TOC abundance and positively correlated with laminae thickness standard deviation. As for the absorbed gas storage capacity, it increases with TOC abundance. But in the muddy laminae, TOC abundance significantly varies. With the increasing proportion of silty laminae, the free gas storage capacity increases, and it is also controlled by water saturation influenced by the TOC abundance and the laminae thickness standard deviation. As the main factor controlling adsorbed gas storage capacity, TOC abundance tends to decrease with the increasing proportion of silty laminae. However, the decreasing trend of absorbed gas storage capacity with the increasing proportion of silty laminae is not that obvious due to the significantly varying TOC abundance per unit thickness of silty and muddy laminae." @default.
- W2893612380 created "2018-10-05" @default.
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- W2893612380 date "2018-12-01" @default.
- W2893612380 modified "2023-09-23" @default.
- W2893612380 title "Impact of laminae on gas storage capacity: A case study in Shanxi Formation, Xiasiwan Area, Ordos Basin, China" @default.
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- W2893612380 doi "https://doi.org/10.1016/j.jngse.2018.09.001" @default.
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