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Effects of caprock sealing capacities on coalbed methane preservation: Experimental investigation and case study
Alternative TitleEffects of caprock sealing capacities on coalbed methane preservation: Experimental investigation and case study
Tian Fuchao1; Liang Yuntao1; Wang Deming2; Jin Kan1
2019
Source PublicationJOURNAL OF CENTRAL SOUTH UNIVERSITY
ISSN2095-2899
Volume26Issue:4Pages:925-937
AbstractCaprocks play an important role in the trapping of coalbed methane (CBM) reservoirs. To study the sealing capacities of caprocks, five samples with different lithologies of Neogene clayrock, Paleogene redbeds, Permian sandstone, Permian mudstone and Permian siltstone were collected and tested using experimental methods of microstructure observation, pore structure measurement and diffusion properties determination. Results indicate that with denser structures, lower porosities, much more developed micropores/transition pores and higher pore/throat ratios, mudstone and siltstone have the more ideal sealing capacities for CBM preservation when comparing to other kinds of caprocks; the methane diffusion coefficients of mudstone/siltstone are about 6 times higher than sandstone and almost 90 times higher than clayrock/redbeds. To further estimate the CBM escape through caprocks, a one-dimensional CBM diffusion model is derived. Modeling calculation result demonstrates that under the same thickness, the CBM sealing abilities of mudstone/siltstone are almost 100 times higher than those of clayrock/redbeds, and nearly 17 times higher than sandstone, which indicates that the coal seam below caprocks like clayrock, redbeds or sandstone may suffer stronger CBM diffusion effect than that below mudstone or siltstone. Such conclusion is verified by the case study from III3 District, Xutuan Colliery, where the coal seam capped by Paleogene redbeds has a much lower CBM content than that capped by the Permian strata like mudstone, siltstone and sandstone.
Other AbstractCaprocks play an important role in the trapping of coalbed methane (CBM) reservoirs. To study the sealing capacities of caprocks, five samples with different lithologies of Neogene clayrock, Paleogene redbeds, Permian sandstone, Permian mudstone and Permian siltstone were collected and tested using experimental methods of microstructure observation, pore structure measurement and diffusion properties determination. Results indicate that with denser structures, lower porosities, much more developed micropores/transition pores and higher pore/throat ratios, mudstone and siltstone have the more ideal sealing capacities for CBM preservation when comparing to other kinds of caprocks; the methane diffusion coefficients of mudstone/siltstone are about 6 times higher than sandstone and almost 90 times higher than clayrock/redbeds. To further estimate the CBM escape through caprocks, a one-dimensional CBM diffusion model is derived. Modeling calculation result demonstrates that under the same thickness, the CBM sealing abilities of mudstone/siltstone are almost 100 times higher than those of clayrock/redbeds, and nearly 17 times higher than sandstone, which indicates that the coal seam below caprocks like clayrock, redbeds or sandstone may suffer stronger CBM diffusion effect than that below mudstone or siltstone. Such conclusion is verified by the case study from III3 District, Xutuan Colliery, where the coal seam capped by Paleogene redbeds has a much lower CBM content than that capped by the Permian strata like mudstone, siltstone and sandstone.
KeywordORDOS BASIN COALFIELD GAS DIFFUSION SYSTEM AREA caprock sealing capacity coalbed methane preservation
Indexed ByCSCD
Language英语
Funding Project[National Key Research and Development Plan, China] ; [National Natural Science Foundation of China]
CSCD IDCSCD:6574326
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/151900
Collection中国科学院金属研究所
Affiliation1.China University Min & Technol, Sch Safety Engn, Xuzhou 221116, Jiangsu, Peoples R China
2.中国科学院金属研究所
Recommended Citation
GB/T 7714
Tian Fuchao,Liang Yuntao,Wang Deming,et al. Effects of caprock sealing capacities on coalbed methane preservation: Experimental investigation and case study[J]. JOURNAL OF CENTRAL SOUTH UNIVERSITY,2019,26(4):925-937.
APA Tian Fuchao,Liang Yuntao,Wang Deming,&Jin Kan.(2019).Effects of caprock sealing capacities on coalbed methane preservation: Experimental investigation and case study.JOURNAL OF CENTRAL SOUTH UNIVERSITY,26(4),925-937.
MLA Tian Fuchao,et al."Effects of caprock sealing capacities on coalbed methane preservation: Experimental investigation and case study".JOURNAL OF CENTRAL SOUTH UNIVERSITY 26.4(2019):925-937.
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