Study of gas adsorption/desorption properties in coals of Sabinas Basin on Mexico

Autor: Enciso-Cárdenas, J.J., Rodrígues, C., Martínez, L., Camacho-Ortegón, L.F., Lemos-De Sousa, M.
Přispěvatelé: CAMACHO-ORTEGON LF
Jazyk: Spanish; Castilian
Rok vydání: 2023
Předmět:
DOI: 10.5281/zenodo.8045426
Popis: The main objective of this research was to study the gas adsorption/desorption properties in Coal Bed Methane reservoirs located in the North-eastern Mexico, and to understand the behavior of unconventional reservoirs. The Servicio Geológico Mexicano (SGM) performed a sampling campaign. For the characterization, the SGM providing us 7 bituminous coal samples from the Sabinas Basin. The general characterization included: (1) immediate or primary moisture and ash analysis (2) elemental analysis for (C, H, O, N, and S) quantification, (3) petrographic analysis for organic matter type determination, (4) Rock-Eval®6 Pyrolysis, for oil potential generation determination. After results evaluation, 7 samples were selected, in order to develop adsorption/desorption CH4 tests by “Langmuir Isotherms” and to understand of parameters affecting the adsorption process. Using thermo-volumetric technique could be observed storage capacities of methane gas between 202.11 scf/ton (7.07m3/ton) and 364.76 scf/ton (10.47 m3/ton). The adsorption/desorption tests results, let us to identify the physical and chemical characteristics of the samples influencing the gas storage capacity in the coal. A general conclusion is given; the gas adsorption increases with the rank/maturity. Also, the influence of the maceral composition in the process of sorption is recognized, and the capacity of gas storage is closely related to the vitrinite content. According to Chalmers y Bustin (2008), and Zhang et al. (2012), the capacity of adsorption as TOC, increases in the next order: type I < type II < type III. This is attributed to high adsorption capacity of vitrinite, compared with other macerals types.
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