Abstract
The adsorption capacities of the Lower Silurian Longamxi and Lower Cambrian Niutitang marine shales in the Yangtze Platform in China were investigated through methane adsorption experiments. The correlations between the adsorption capacities and major factors, e.g., total organic carbon (TOC) contents, thermal maturity, mineral composition, moisture content, pressure, and temperature, were discussed. The isosteric adsorption heat was calculated according to the temperature dependency of the methane adsorption isotherms. The results show that, under the temperature of 30 °C and pressure range of 0–12 MPa, the maximum adsorption capacity of the Longmaxi shales ranges between 0.47 and 3.08 m3/ton of rock and that of the Niutitang shales ranges between 1.59 and 7.43 m3/ton of rock. The Langmuir adsorption capacity varies from 0.54 to 3.84 m3/ton of rock for the Longmaxi shales and from 1.98 to 9.73 m3/ton of rock for the Niutitang shales. The TOC content shows a significantly positive correlation with the ads...
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