Abstract
The enriched characters of methane content in the main coal seam of Yunnan’s Laochang coal mine was analyzed through combined with the geologic conditions of the research area: structure type, hydrogeology condition, coal reservoir’s macerals, ash, water content, and so on. The geology factors of controlling gas in Laochang coal mine were illustrated; and the different geology models of controlling gas of geologic condition coupling were posed. Research shows that, in the region, the methane contents of the main coal seams decrease gradually from middle to all around it; the northeast and southeast is higher than the west. In the local area, the methane content of anticline axis is higher, and the gas content is reduced to both wings and plunging crown. On macroscopic view, the distribution of methane content in coal-beds was controlled by structural type. On microscopic view, the methane content in coal-beds is mainly involved in coal reservoir’s macerals, ash content, and water content. The enriched characters of CBM in the research area are mainly the result of structure-hydrogeology-petrophysics coupling controls of CBM. On the basis of above analysis, according to the distribution character of methane content in coalbeds, the research area was divided into low gas area, middle gas area, and high gas area.
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Supported by the National Major Special Projects of Science and Technology of China (2011ZX05034); the National Basic Research Program of China (2009CB219605); the National Natural Science Foundation of China (41272178)
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Wu, Cf., Chen, Zy., Wang, C. et al. The enrichment characteristics and geological controlling factors of coalbed methane occurrence in Laochang area, Yunnan Province. J Coal Sci Eng China 18, 355–361 (2012). https://doi.org/10.1007/s12404-012-0404-5
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DOI: https://doi.org/10.1007/s12404-012-0404-5