Geological factors on gas entrapment mechanism and prediction of coalbed methane of the no. 6 coal seam in the Jungar coalfield, northeast ordos Basin, China

Yongkai Qiu, Dameng Liu, Derek Elsworth, Yanbin Yao, Yidong Cai, Junqian Li

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Low rank coal reservoirs of the no. 6 coal seam in the Jungar coalfield are characterised by low gas content but favourable porosity and permeability for recovery. The accumulation and enrichment of CBM is favoured by the presence of multiple (five seams) and thick (12.7-40.4 m) seams, adequate permeability (3.6-26 mD) and significant abundance of coal resource (5.44 × 1010 tonnes), but hindered by low observed gas content (0.01-1.5 m3/t), which is shown to result from both shallow burial depth and high permeability of the seams. However, the sheer magnitude of the no. 6 coal resource offsets this shortcoming of low gas content and makes this a good prospect for exploration and exploitation. Conditions are most favourable in the southwest coalfield where a monoclinal structure and favourable hydrodynamic conditions have prevented gas escape. Areas of the no. 6 coal seam buried under the CH4 weathering line (> 860 m), with larger coal thickness (> 10 m), and higher gas content (> 1.2 m3/t) have the greatest potential for CBM enrichment.

Original languageEnglish (US)
Pages (from-to)449-467
Number of pages19
JournalInternational Journal of Oil, Gas and Coal Technology
Volume8
Issue number4
DOIs
StatePublished - 2014

All Science Journal Classification (ASJC) codes

  • Energy(all)

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