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

Volumen 21, Edición 10, 2018, pp. 929-951
DOI: 10.1615/JPorMedia.2018021142
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SINOPSIS

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.

CITADO POR
  1. Chen Ming‐yi, Yang Ya‐pu, Gao Cai‐hong, Cheng Yuan‐ping, Wang Jing‐chun, Wang Ning, Investigation of the fractal characteristics of adsorption‐pores and their impact on the methane adsorption capacity of various rank coals via N 2 and H 2 O adsorption methods , Energy Science & Engineering, 8, 9, 2020. Crossref

  2. Xia Peng, Li Hongnan, Fu Yong, Qiao Wenlang, Guo Chuan, Yang Zhen, Huang Jinqiang, Mou Yuliang, Effect of lithofacies on pore structure of the Cambrian organic‐rich shale in northern Guizhou, China, Geological Journal, 56, 2, 2021. Crossref

  3. Xie Weidong, Wang Meng, Duan Hongyue, Adsorption Characteristics and Controlling Factors of CH4 on Coal-Measure Shale, Hedong Coalfield, Minerals, 11, 1, 2021. Crossref

  4. Memon Asadullah, Memon Bilal Shams, Muther Temoor, Qureshi Abdul Sami, Uqaili Umaid Ali, Jeswani Sunder Sham, Zardari Zaheer Hussain, Quantitative models and controlling factors of Langmuir volume and pressure for the measurement of shale gas adsorption: An Analytical study based review, Arabian Journal of Geosciences, 15, 8, 2022. Crossref

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