Characteristics of High Rank Coalbed Methane Reservoir from the Xiangning Mining Area, Eastern Ordos Basin, China

To identify the methanogenic pathways present in a deep coal bed methane (CBM) reservoir associated with Eastern Ordos Basin in China, a series of geochemical and microbiological studies was performed using gas and water samples produced from the Liulin CBM reservoir. The composition and stable isotopic ratios of CBM implied a mixed biogenic and thermogenic origin of the methane. Archaeal 16S rRNA gene analysis revealed the dominance of the methylotrophic methanogen Methanolobus in the water produced. The high potential of methane production by methylotrophic methanogens was found in the enrichments using the water samples amended with methanol and incubated at 25 and 35°C. Methylotrophic methanogens were the dominant archaea in both enrichments as shown by polymerase chain reaction (PCR)-denaturing gradient gel electrophoresis (DGGE). Bacterial 16S rRNA gene analysis revealed that fermentative, sulfate-reducing, and nitrate-reducing bacteria inhabiting the water produced were a factor in coal biodegradation to fuel methanogens. These results suggested that past and ongoing biodegradation of coal by methylotrophic methanogens and syntrophic bacteria, as well as thermogenic CBM production, contributed to the Liulin CBM reserves associated with the Eastern Ordos Basin.

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“…1 Location of the Liulin District in China. The map is modified from Ding et al (2011) Eastern Ordos Basin (Fig. 1).…”

Section: Study Site and Sample Collectionmentioning

confidence: 99%

Methylotrophic methanogenesis governs the biogenic coal bed methane formation in Eastern Ordos Basin, China

Guo

Liu

et al. 2012

Appl Microbiol Biotechnol

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“…The characteristics of pore structures in coal are related to many factors, including the coal's degree of metamorphism (Bustin and Clarkson 1998;Prinz et al 2004;Prinz and Littke 2005;Tang et al 2008;Zhou and Wu 2012;Ding et al 2011;Gürdal and Yalçın 2001), degree of deformation Ogawa 2001, 2003;Jiang et al 2011;Xue et al 2012;Qu and Wang 2010), macerals (Zhou and Wu 2012;Gürdal and Yalçın 2001;Cai et al 2011;Mastalerz et al 2008), and minerals (Zhou and Wu 2012). Many scholars have conducted a tremendous amount of research in this aspect.…”

Section: Introductionmentioning

confidence: 99%

“…Many scholars have conducted a tremendous amount of research in this aspect. Among them, most are about the effects of metamorphism on the pore system of coal (Bustin and Clarkson 1998;Prinz et al 2004;Prinz and Littke 2005;Tang et al 2008;Zhou and Wu 2012;Ding et al 2011;Gürdal and Yalçın 2001). CO 2 isothermal adsorption experiments conducted by Bustin and Clarkson (1998) showed that as coal rank increased, the volume and surface area of micropores (<2 nm) in coal samples decreased initially and then increased and reached the minimum at the bituminous coal stage.…”

Section: Introductionmentioning

confidence: 99%

“…Many scholars have used mercury intrusion porosimetry, liquid nitrogen and small-angle neutron scattering to study coal pore structures and its influence factors, and they have also carried out significant discussions on the impact on CH 4 adsorption capacity (Bustin and Clarkson 1998;Prinz et al 2004;Prinz and Littke 2005;Tang et al 2008;Zhou and Wu 2012;Ding et al 2011;Gürdal and Yalçın 2001;Ogawa 2001, 2003;Jiang et al 2011;Xue et al 2012;Qu and Wang 2010;Cai et al 2011;Mastalerz et al 2008;Pan et al 2012;Sakurovs et al 2012;Feng et al 2013;Cai et al 2013;Zhang et al 2012). However, we find that the studies on tectonically deformed coal are not fully addressed, particularly in nanoscale pore level.…”

Section: Introductionmentioning

confidence: 99%

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Nanoscale Pores in Coal Related to Coal Rank and Deformation Structures

et al. 2015

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Experimental results show that nanoscale pores in coal are affected by coal rank and deformation structures. In terms of pore volume, the transitional pores occupy the largest proportion, and in terms of specific surface area, the sub-micropores take up the largest proportion. For weak brittle deformed coal (including normal structured coal), when the coal rank increases, the volume and specific surface area of pores in different sizes firstly decrease and then increase. The volume and specific surface area of transitional pores and micropores in coal reach the minimum at about R O,ran = 2.0 %. After that, a slow increasing trend is observed. The volume of sub-micropores reaches the minimum at about R O,ran = 1.5 % and then shows a trend of rapid growth as coal rank increases. As the degree of coal deformation increases, both pore volume and specific surface area have a significant increase. Under strong tectonic deformation, both the volume and total specific surface area of the nanoscale pores and of sub-micropores increase significantly; the volume of transitional pores increases moderately, and their specific surface area shows a decreasing trend; the volume and specific surface area increments of micropores decline rapidly as the degree of metamorphism increases.

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“…Coal-bed methane (CBM) can be thought as an important potential resource after changing from hazard to resource (Flores, 1998) and has been studied for many years since the late 20 th century (Bustin and Clarkson, 1998;Ding et al, 2011). To assess the gas content and mining safety, the factors of controlling gas distribution has been Coal seams in the researched region are mainly characterized with middle ash and sulfur, but some deeper buried coals, such as Nos.…”

Section: Introductionmentioning

confidence: 99%

Vertical Diversity of Coalbed Methane Content and its Geological Controls in the Qingshan Syncline, Western Guizhou Province, China

Qin

Gao

et al. 2012

Energy Exploration & Exploitation

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The distribution of methane content in the coalbed is complex in the Qinshan Syncline of western Guizhou Province. Analyses of factors controlling on the distribution of gas content are made in this paper. Coal ranks and geo-structure in the region showed strong controls on the gas distribution. Coals with higher degree of metamorphism or located in syncline most likely have higher gas content. With the concept of coalbed methane content unite thickness (CBMCUT), those factors such as coal seam buried depth and coal structure present positive relations with gas content. Results indicated that the variation of CBMCUT is not fixed in different research areas or in different coal structures. Namely, the variation follows "v-shaped" correlation with the increasing coal buried depth in the region of Qinshan Syncline. However, the trend is smooth for the coals in the Panzhuang mining area. Usually, the critical value for primary-texture coal and mylonitized is different based on the analysis of the relationship between coal structure and CBMCUT in those two areas described above. The value is commonly higher in mylonitized coal and lower in those mainly primary-texture and fragmented coals.

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Characteristics of High Rank Coalbed Methane Reservoir from the Xiangning Mining Area, Eastern Ordos Basin, China

Cited by 15 publications

References 28 publications

Methylotrophic methanogenesis governs the biogenic coal bed methane formation in Eastern Ordos Basin, China

Methylotrophic methanogenesis governs the biogenic coal bed methane formation in Eastern Ordos Basin, China

Nanoscale Pores in Coal Related to Coal Rank and Deformation Structures

Vertical Diversity of Coalbed Methane Content and its Geological Controls in the Qingshan Syncline, Western Guizhou Province, China

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