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Chemistry and Technology of Fuels and Oils

, Volume 55, Issue 3, pp 319–330 | Cite as

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

  • Jianxun Jiang
  • Jingguo Du
  • Yongqing Wang
  • Fenglin Wang
  • Kun Feng
  • Chunpeng Leng
Article
  • 16 Downloads

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.

Keywords

fractal dimensions model for parameter calculation porous structure high-rank coalbed methane formation improved model mercury intrusion porosimetry 

Notes

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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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Jianxun Jiang
    • 1
  • Jingguo Du
    • 1
    • 2
  • Yongqing Wang
    • 1
  • Fenglin Wang
    • 3
  • Kun Feng
    • 3
  • Chunpeng Leng
    • 2
  1. 1.College of Oil and Natural Gas EngineeringSouthwest Petroleum UniversityChengduChina
  2. 2.College of Mining EngineeringNorth China University of Science and TechnologyChengduChina
  3. 3.China United Coalbed Methane Corporation, LtdBeijingChina

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