Block scale investigation on gas content of coalbed methane reservoirs in southern Qinshui basin with statistical model and visual map

Liu, Huihu, Sang, Shuxun, Wang, Geoff G. X., Li, Mengxi, Xu, Hongjie, Liu, Shiqi, Li, Junjun, Ren, Bo, Zhao, Zhigen and Xie, Yan (2014) Block scale investigation on gas content of coalbed methane reservoirs in southern Qinshui basin with statistical model and visual map. Journal of Petroleum Science and Engineering, 114 1-14. doi:10.1016/j.petrol.2013.08.039


Author Liu, Huihu
Sang, Shuxun
Wang, Geoff G. X.
Li, Mengxi
Xu, Hongjie
Liu, Shiqi
Li, Junjun
Ren, Bo
Zhao, Zhigen
Xie, Yan
Title Block scale investigation on gas content of coalbed methane reservoirs in southern Qinshui basin with statistical model and visual map
Journal name Journal of Petroleum Science and Engineering   Check publisher's open access policy
ISSN 0920-4105
1873-4715
Publication date 2014-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.petrol.2013.08.039
Volume 114
Start page 1
End page 14
Total pages 14
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2014
Language eng
Abstract This study performs a block scale investigation on gas content of a coal reservoir in Zhengzhuang Block of the southern Qinshui basin in China. The gas content of Coal Seam No. 3 in this coal reservoir was measured in field and laboratory in conjunction with tests on coal properties such as adsorption isotherm, maximum vitrinite reflectance, coal composition and maceral component etc. Total 36 coal cores collected from 3 adjacent coalmines in the southern Qinshui basin were investigated, including analysis of logging data from the drilling wells. The investigations provided experimental data for block scale modeling and visualization analyses on the correlation between gas content and the key factors such as coal properties and geological conditions of the coal reservoir. Data obtained by field and lab tests were analyzed by statistical models in order to correlate gas content and individual type of coal properties and geological variables. The statistical model was then used to map the gas content of the target coal seam in the studied area, resulting in a flood map of gas content at a 1:50000 scale. The flood map was further visualized with other variables in terms of the properties of coal and coal reservoir and its geological conditions. These visualized maps provide useful geological interpretation for block scale investigation of the comprehensive relationships between the gas content and the coal properties and regional structure in the given coal reservoir. The results show that gas content has little correlation with coal rank, maceral composition, coal thickness, cap and bottom lithology, while it is highly related to the structural properties such as burial depth and effective cover thickness. A stagnant hydrodynamic condition is favorable to the higher gas content on the whole but does not contribute to gas lateral and local variation. Canonical correlation and principal component analysis on the statistical model reveal the key factors that control the gas content are burial depth, effective thickness of overlying strata, groundwater level and moisture content in coal seam.
Keyword Coalbed methane
Gas content
Reservoir evaluation
Southern Qinshui basin
Statistical model
Visual map
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 2014 Collection
 
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