Journal
CHEMICAL ENGINEERING JOURNAL
Volume 402, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126238
Keywords
Gas shale; Water vapor adsorption; Oxygen-containing functional group; Pore structure; Organic matter
Categories
Funding
- National Science and Technology Major Project [2016ZX05061]
- National Natural Science Foundation of China [41902154, 51674209]
- China Postdoctoral Science Foundation [2017 M623062]
- China Scholarship Council [201808510191, 201908515138]
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To determine the effects of surface chemistry and the pore structure of shale on water vapor adsorption behavior, water vapor isothermal adsorption experiments were performed with untreated and 15 wt% H2O2 treated shale samples from Longmaxi Formation, Sichuan Basin, China. Additionally, low-pressure N-2 ad-/desorption, X-ray diffraction, and X-ray photoelectron spectra measurements were conducted to analyze the pore structure, mineral composition, and functional groups in shale pore surfaces, respectively. The results show that when relative humidity ranged from 0 to 1, water vapor adsorption occurred through primary adsorption sites (monolayer adsorption) and secondary adsorption sites (multi-layer adsorption and capillary condensation). Adsorption by the primary sites was directly related to the number and type of oxygen-containing functional groups and pore size. Furthermore, compared with C-C/C-H and C-O, the functional groups of COO- and C = O/O-C-O provided more adsorption sites. A smaller pore size resulted in more water vapor adsorbed at the primary adsorption sites. The adsorption at secondary sites is not affected by the surface chemical properties; rather, it is directly related to pore volume. Additionally, a larger pore volume results in increased water vapor adsorbed by the secondary adsorption sites. These findings contribute to a better understanding of the primary water distribution in the multiscale pore structure of shale and accurate evaluation of the amount of gas in place.
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