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# 深层页岩气等温吸附数学模型研究Isothermal Adsorption Mathematical Model of Deep Shale Gas

DOI: 10.12677/jogt.2024.462017, PP. 135-140

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Abstract:

Deep shale gas reserves account for a large proportion in China. It is of great significance to clarify the adsorption law of deep shale gas for accurate evaluation of deep shale gas reserves. However, the high temperature and pressure of deep shale reservoirs far exceed the experimental test range, leading to the unclear adsorption law of deep shale gas. Therefore, a deep shale kerogen model was constructed by molecular simulation technology to simulate the adsorption behavior of methane in deep shale at high temperature and high pressure, and to reveal the in-situ adsorption law of deep shale gas reservoirs. On this basis, the isothermal adsorption mathematical model of deep shale gas was studied. The results show that with the increase of temperature, the adsorption amount of deep shale gas decreases, and with the increase of pressure, the adsorption amount of deep shale gas increases first fast and then slowly, and tends to be flat in the high pressure section. By using the Langmuir model, Freundlich model and Langmuir-Freundlich model to fit the simulated data, it is clear that the Langmuir-Freundlich model can better describe the adsorption law of deep shale gas.

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