Molecular Simulation of Adsorption in Deep Marine Shale Gas Reservoirs

Cheng Chang, Jian Zhang, Haoran Hu, Deliang Zhang and Yulong Zhao
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Cheng Chang: PetroChina Southwest Oil & Gas Field Company, Chengdu 610000, China
Jian Zhang: PetroChina Southwest Oil & Gas Field Company, Chengdu 610000, China
Haoran Hu: PetroChina Southwest Oil & Gas Field Company, Chengdu 610000, China
Deliang Zhang: PetroChina Southwest Oil & Gas Field Company, Chengdu 610000, China
Yulong Zhao: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610000, China

Energies, 2022, vol. 15, issue 3, 1-13

Abstract: Deep marine shale gas reservoirs are extremely rich in the Sichuan basin in China. However, due to the in situ conditions with high temperature and high pressure (HTHP), in particular reservoir pressure being usually much higher than the test pressure, it is difficult to accurately clarify the adsorption behavior, as seepage theory plays an important role in shale gas reserves evaluation. Therefore, three kinds of sorbent, including illite, quartz and kerogen, and two simulation methods, containing the grand canonical ensemble Monte Carlo method and molecular dynamics method, are synthetically used to determine the methane adsorption behavior under HTHP. The results show that both absolute adsorption and excess adsorption decrease with the increase of temperature. When the pressure increases, the absolute adsorption increases quickly and then slowly, and the excess adsorption first increases and then decreases. The superposition of wall potential energy is strongest in a circular hole, second in a square hole, and weakest in a narrow slit. The effect of pore size increases with the decrease of the pore diameter. Under HTHP, multi-layer adsorption can occur in shale, but the timing and number of layers are related to the sorbent type.

Keywords: shale gas reservoir; deep marine; adsorption; high temperature and high pressure; effect of pore size; molecular simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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