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The Role of Organics on the Sorption Capacity of Paleozoic Shales From Upper Yangtze Region, China

Abstract

The role of organic matter on the sorption capacity of Cambrian, Silurian and Permian shales from Southern China were investigated in terms of soluble organic matter influence and the kerogen sorption. The results show that: 1) the sorption isotherms of Cambrian and Silurian overmatured kerogen are similar to that of Triassic coal, while the sorption isotherms of Permian matured kerogen display a similar sorption pattern as that of immature oil shale kerogen; 2) the methane sorption capacity of kerogen are in a broad range of variation as from 14.48 to 23.22 cm3/g at STP for Cambrian kerogen, from 15.50 to 36.06 cm3/g at STP for Silurian kerogen and from 10.71 to 11.15 cm3/g at STP for Permian kerogen; 3) the kerogen sorption is accounted for 36 ∼ 78% of the total sorption capacity of the shales and demonstrated that kerogen is the most primary sorption factor in shales, however, the significance of kerogen sorption display a decreasing trend along with the increase in the geological age of shales; 4) the removal of soluble organic matter could cause a maximum change from 34% increase to 23% decrease in the total sorption capacity of shales, which suggest that the soluble organic matter has significant but complicated impact on the sorption ability of shales of different geological age.

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