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Journal of Porous Media
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ISSN Imprimer: 1091-028X
ISSN En ligne: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.2018021142
pages 929-951

INVESTIGATION OF FRACTAL CHARACTERISTICS OF TAIYUAN FORMATION COAL-SHALE FROM SOUTHERN QINSHUI BASIN, CHINA, BY NITROGEN ADSORPTION AND DESORPTION ANALYSIS

Kunjie Li
Department of Earth Science and Engineering, Taiyuan University of Technology, Taiyuan, China; Shanxi Provincial Guoxin Energy Development Group Company Limited, Taiyuan, China
Fangui Zeng
Department of Earth Science and Engineering, Taiyuan University of Technology, Taiyuan, China; Shanxi Key Laboratory of Coal and Coal Measures Gas Geology, Taiyuan, China
Guanglong Sheng
State Energy Center for Shale Oil Research and Development, Beijing, 100083, China; School of Petroleum Engineering, China University of Petroleum (East China), Shandong, 266580, China; Bureau of Economic Geology, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, 78713, USA
Gang Chen
Shanxi Provincial Guoxin Energy Development Group Company Limited, Taiyuan, China
Peng Xia
Department of Earth Science and Engineering, Taiyuan University of Technology, Taiyuan, China; Shanxi Key Laboratory of Coal and Coal Measures Gas Geology, Taiyuan, China

RÉSUMÉ

Located in the southeastern Shanxi province of China, the Taiyuan formation shale in the Qinshui basin is the transitional facies coal-shale gas resource. For the purpose of understanding its nanometer-scaled pore structure system in terms of fractal theory, 13 samples from the Well QS-1 were characterized by total organic carbon (TOC) tests, vitrinite reflectance (R0) tests, permeability tests, X-ray diffraction (XRD), nitrogen adsorption, and methane adsorption experiments. Two fractal dimensions D1 and D2 (at relative pressure of 0-0.45 and 0.45-1, respectively) were obtained from the low-pressure nitrogen adsorption data using the Frenkel–Halsey–Hill (FHH) model. D1 represents the pore surface fractal feature from 2.2740 to 2.6010, while D2 represents the pore structure fractal feature from 2.5718 to 2.7871. Both D1 and D2 have a positive correlation with TOC, indicating that TOC is an essential factor for fractal dimensions. The brittle minerals have a positive influence on fractal dimensions, whereas clay minerals have a negative impact. The fractal dimensions were influenced by the pore structure parameters, such as the specific surface area, Barret–Joyner–Halenda (BJH) pore volume, and average pore size. The fractal dimensions can also be used to evaluate the gas adsorption capacity and gas flow capacity. Coal-shale with higher D1 could provide more surface sites and have higher adsorption force for gas adsorption, while coal-shale with higher D2 has more complex pore structure, which leads to lower permeability against the gas flow in shale.


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