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Improved Model for Characterization of Fractal Features of the Pore Structure in a High-Rank Coalbed Methane Formation

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Chemistry and Technology of Fuels and Oils Aims and scope

In this paper, we propose a theoretically derived improved model for characterizing the fractal features of coalbed methane reservoirs, and we compare with previously published models for conventional reservoirs. The model was verified by mercury intrusion porosimetry. The results have shown that there is no linear relationship between the normalized wetting phase saturation, wetting phase saturation, or mercury saturation vs. the capillary pressure on a log-log plot. Therefore existing models are inapplicable for a high-rank CBM formation, which is characterized by low permeability and porosity. The improved model lets us calculate the multi-interval fractal features characterizing the physical properties of the formation. We show that higher fractal dimensions mean poorer physical properties of the formation.

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This study was financially supported by the National Foundation for Science and Technology Special Projects of China: Research Projects in Technology, Geological Survey Equipment, and Coalbed Methane Production (2016ZX-5042-004).

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Authors and Affiliations

  1. College of Oil and Natural Gas Engineering, Southwest Petroleum University, Chengdu, China

    Jianxun Jiang, Jingguo Du & Yongqing Wang

  2. College of Mining Engineering, North China University of Science and Technology, Chengdu, China

    Jingguo Du & Chunpeng Leng

  3. China United Coalbed Methane Corporation, Ltd, Beijing, China

    Fenglin Wang & Kun Feng

Authors
  1. Jianxun Jiang
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  2. Jingguo Du
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  3. Yongqing Wang
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  4. Fenglin Wang
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  5. Kun Feng
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  6. Chunpeng Leng
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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 3, pp. 70 — 75, May — June, 2019.

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Jiang, J., Du, J., Wang, Y. et al. Improved Model for Characterization of Fractal Features of the Pore Structure in a High-Rank Coalbed Methane Formation. Chem Technol Fuels Oils 55, 319–330 (2019). https://doi.org/10.1007/s10553-019-01035-3

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  • DOI: https://doi.org/10.1007/s10553-019-01035-3

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