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
by Yongkai Qiu; Dameng Liu; Derek Elsworth; Yanbin Yao; Yidong Cai; Junqian Li
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 8, No. 4, 2014

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. [Received: January 21, 2014; Accepted: July 27, 2014]

Online publication date: Tue, 23-Dec-2014

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Oil, Gas and Coal Technology (IJOGCT):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com