Influence of moisture content and temperature on methane adsorption isotherm analysis for coals from a low-rank, biogenically-sourced gas reservoir

Crosdale, Peter J., Moore, Tim A. and Mares, Tennille E. (2008) Influence of moisture content and temperature on methane adsorption isotherm analysis for coals from a low-rank, biogenically-sourced gas reservoir. International Journal of Coal Geology, 76 1-2: 166-174. doi:10.1016/j.coal.2008.04.004


Author Crosdale, Peter J.
Moore, Tim A.
Mares, Tennille E.
Title Influence of moisture content and temperature on methane adsorption isotherm analysis for coals from a low-rank, biogenically-sourced gas reservoir
Journal name International Journal of Coal Geology   Check publisher's open access policy
ISSN 0166-5162
1872-7840
Publication date 2008-10-02
Sub-type Article (original research)
DOI 10.1016/j.coal.2008.04.004
Volume 76
Issue 1-2
Start page 166
End page 174
Total pages 9
Editor Romeo M. Flores
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
Samples of subbituminous coal from the Huntly Coalfield, New Zealand, were analyzed for methane adsorption at a variety of moisture contents and temperatures. Density and moisture determinations as part of the procedure were used to experimentally confirm that the packing density of water adsorbed to the coal's surface is equivalent to that of normal liquid water. Moisture content was found to be critical in evaluating the storage capacity of these coals. Low moisture was associated with elevated adsorption isotherms. The relationship between moisture content and gas adsorption is non-linear. Temperature over the range we tested was found to play only a small role in storage capacity for this coal. A series of algorithms were developed to correct for moisture and temperature variations between samples. Testing of the algorithms by using an additional sample indicated that they are close to predicting experimental data but that the constants still require further refinement. These algorithms only apply to this coalfield and are not intended to be widely applied. In addition, it was found that methane adsorption isotherms determined on samples collected after desorption were elevated in comparison to those determined on samples which were collected immediately after drilling.
Keyword Coalbed methane
Biogenic gas
Isotherm
Moisture
Temperature
Holding capacity
Bowen Basin
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Special Issue: "Microbes, Methanogenesis, and Microbial Gas in Coal": This issue is the "Selected Proceedings of the Coal Geology Division session on 'Microbial Origin of Hydrocarbon Gases and Sedimentary Basins', Annual Meeting of the Geological Society of America, 28-31 October 2007, Denver, Colorado, U.S.A.". This paper was not presented at that conference: "Eight additional papers ...were included to broaden the scope of the Special Issue".

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth Sciences Publications
 
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