Investigation on coal seam gas formation of multi-coalbed reservoir in Bide-Santang Basin Southwest China

Yang, Zhaobiao, Qin, Yong, Wang, Geoff X. and An, Hui (2014) Investigation on coal seam gas formation of multi-coalbed reservoir in Bide-Santang Basin Southwest China. Arabian Journal of Geosciences, 8 8: 5439-5448. doi:10.1007/s12517-014-1640-3

Author Yang, Zhaobiao
Qin, Yong
Wang, Geoff X.
An, Hui
Title Investigation on coal seam gas formation of multi-coalbed reservoir in Bide-Santang Basin Southwest China
Journal name Arabian Journal of Geosciences   Check publisher's open access policy
ISSN 1866-7538
Publication date 2014-09-30
Year available 2014
Sub-type Article (original research)
DOI 10.1007/s12517-014-1640-3
Volume 8
Issue 8
Start page 5439
End page 5448
Total pages 10
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Abstract This paper presents a comprehensive study on the geological characteristics of a multi-coalbed reservoir using coal cores collected from well drilling tests in Bide-Santang Basin, China. The study focuses on the investigation of the coalbed methane (CBM)-bearing property, porosity and permeability, sealability of capping rocks, and groundwater characteristics in coal seams, providing the experimental information on the control function of sequence strata for the coalbed methane. This reservoir is comprised of a large number of coalbeds and exhibits many distinctive geological characteristics of a CBM reservoir, such as high CBM content, complex vertical volatility of CBM content, vertical discontinuous distribution of porosity and permeability, strong sealing capping property and many vertical water-bearing systems, etc. The investigation shows that the unattached multiple superposed CBM-bearing system (UMSCS), which formed the unique multi-coalbed CBM reservoir, can be identified in the study area. Depending on the development scale of vertically unattached CBM-bearing coal seams, the CBM reservoir in the study area can be classified as simple UMSCS and complex UMSCS. The former, typically appearing in Zhuzang syncline and Agong syncline, exhibits the continuity of geological reservoir-forming characteristics in terms of less coal seams, much weaker sealability of capping rocks, higher CBM content, and many vertical water-bearing systems. The latter, typically represented by Shuigonghe syncline and Santang syncline, shows the continuity of geological reservoir-forming characteristics with a large number of coal seams, strong sealing capping property, and reasonably high CBM content. For simple UMSCS reservoirs, a sublevel exploitation method should be adopted for CBM exploitation in order to minimize the effect caused by larger variation of the reservoir energy in different systems. For complex UMSCS reservoirs, one effective way for CBM exploitation is to fracture virtual reservoir (mainly key sandstone member) to depressurize it uniformly and thus achieve large-scale discharging and mining in several adjacent CBM-bearing subsystems.
Keyword Coal
Coal seam group
Coalbed methane (CBM)
Coal reservoir
Reservoir characterization
Reservoir formation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
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Created: Tue, 21 Oct 2014, 10:24:57 EST by System User on behalf of School of Chemical Engineering