Numerical investigations on mapping permeability heterogeneity in coal seam gas reservoirs using seismo-electric methods

Gross, L. and Shaw, S. (2016) Numerical investigations on mapping permeability heterogeneity in coal seam gas reservoirs using seismo-electric methods. Journal of Geophysics and Engineering, 13 2: S50-S58. doi:10.1088/1742-2132/13/2/S50


Author Gross, L.
Shaw, S.
Title Numerical investigations on mapping permeability heterogeneity in coal seam gas reservoirs using seismo-electric methods
Journal name Journal of Geophysics and Engineering   Check publisher's open access policy
ISSN 1742-2140
1742-2132
Publication date 2016-03-30
Year available 2016
Sub-type Article (original research)
DOI 10.1088/1742-2132/13/2/S50
Open Access Status Not Open Access
Volume 13
Issue 2
Start page S50
End page S58
Total pages 9
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Collection year 2017
Language eng
Abstract Mapping the horizontal distribution of permeability is a key problem for the coal seam gas industry. Poststack seismic data with anisotropy attributes provide estimates for fracture density and orientation which are then interpreted in terms of permeability. This approach delivers an indirect measure of permeability and can fail if other sources of anisotropy (for instance stress) come into play. Seismo-electric methods, based on recording the electric signal from pore fluid movements stimulated through a seismic wave, measure permeability directly. In this paper we use numerical simulations to demonstrate that the seismo-electric method is potentially suitable to map the horizontal distribution of permeability changes across coal seams. We propose the use of an amplitude to offset (AVO) analysis of the electrical signal in combination with poststack seismic data collected during the exploration phase. Recording of electrical signals from a simple seismic source can be closer to production planning and operations. The numerical model is based on a sonic wave propagation model under the low frequency, saturated media assumption and uses a coupled high order spectral element and low order finite element solver. We investigate the impact of seam thickness, coal seam layering, layering in the overburden and horizontal heterogeneity of permeability.
Keyword Coal seam gas reservoirs
Porous media
Seismo-electric conversion
Wave propagation
Permeability
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Earth Sciences Papers
 
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