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Open AccessReview

Review of Formation and Gas Characteristics in Shale Gas Reservoirs

1
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
2
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(20), 5427; https://doi.org/10.3390/en13205427
Received: 3 June 2020 / Revised: 15 July 2020 / Accepted: 14 October 2020 / Published: 17 October 2020
(This article belongs to the Special Issue Development of Unconventional Reservoirs 2020)
An accurate understanding of formation and gas properties is crucial to the efficient development of shale gas resources. As one kind of unconventional energy, shale gas shows significant differences from conventional energy ones in terms of gas accumulation processes, pore structure characteristics, gas storage forms, physical parameters, and reservoir production modes. Traditional experimental techniques could not satisfy the need to capture the microscopic characteristics of pores and throats in shale plays. In this review, the uniqueness of shale gas reservoirs is elaborated from the perspective of: (1) geological and pore structural characteristics, (2) adsorption/desorption laws, and (3) differences in properties between the adsorbed gas and free gas. As to the first aspect, the mineral composition and organic geochemical characteristics of shale samples from the Longmaxi Formation, Sichuan Basin, China were measured and analyzed based on the experimental results. Principles of different methods to test pore size distribution in shale formations are introduced, after which the results of pore size distribution of samples from the Longmaxi shale are given. Based on the geological understanding of shale formations, three different types of shale gas and respective modeling methods are reviewed. Afterwards, the conventional adsorption models, Gibbs excess adsorption behaviors, and supercritical adsorption characteristics, as well as their applicability to engineering problems, are introduced. Finally, six methods of calculating virtual saturated vapor pressure, seven methods of giving adsorbed gas density, and 12 methods of calculating gas viscosity in different pressure and temperature conditions are collected and compared, with the recommended methods given after a comparison. View Full-Text
Keywords: shale gas reservoir; geology; Gibbs excess adsorption; supercritical adsorption; gas viscosity shale gas reservoir; geology; Gibbs excess adsorption; supercritical adsorption; gas viscosity
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Zhang, B.; Shan, B.; Zhao, Y.; Zhang, L. Review of Formation and Gas Characteristics in Shale Gas Reservoirs. Energies 2020, 13, 5427.

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