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A discussion on analytical and numerical modelling of the land subsidence induced by coal seam gas extraction

  • Guojun Wu
  • Shanpo JiaEmail author
  • Bailin Wu
  • Diansen Yang
Original Article

Abstract

Coal seam gas (CSG) is an increasingly important source of natural gas all over the world. Although the influence of conventional oil and gas extraction on surface subsidence has been widely recognized and studied, few studies are carried out on the surface subsidence in coal seam gas fields and its impact on surface infrastructure and the environment. This paper discusses modelling of the surface subsidence associated with coal seam gas production by applying both analytical and numerical methods. By comparison of results from the numerical model and two analytical models, i.e. the disc-shaped reservoir model and the uniaxial compaction model, the analytical solutions cannot describe the complex process of water and gas extraction and have the limitations to predict the surface subsidence, while the numerical model can be better used in prediction of subsidence. After applying the numerical model in numerical analysis, the deformation characteristics of coupled fluid flow, and the effects of permeability change of coal seam, associated overlying and underlying layers, and depressurization rates on surface subsidence are investigated. The results demonstrate that the proposed model can simulate the production of water and gas from coal seams and the associated surface subsidence.

Keywords

Subsidence Coal seam gas production Depressurization Coal matrix shrinkage COMSOL 

Notes

Acknowledgements

The authors gratefully acknowledge the support of the National Natural Science Foundation of China (Grant no. 51379007), the support of the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering (Grant no. Z013007), the Oil and Gas Reservoir Geology and Exploitation (Grant no. PLN1507) and the support of the Youth Innovation Promotion Association, CAS.

Compliance with ethical standards

Conflict of interest

No conflict of interest exists regarding the publication of this paper.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Guojun Wu
    • 1
  • Shanpo Jia
    • 2
    Email author
  • Bailin Wu
    • 3
  • Diansen Yang
    • 1
  1. 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhanChina
  2. 2.Research Center of Geomechanics and Geotechnical EngineeringYangtze UniversityJingzhouChina
  3. 3.CSIRO EnergyMelbourneAustralia

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