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Coal-bed methane geology of the No. 2 coal seam in Fengfeng Coalfield, North China

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Abstract

The Fengfeng Coalfield is an important coal production base in the Hebei Province of North China. It has been reported that higher coal-bed methane (CBM) contents exist in this area showing good prospects for the exploration of CBM. However, there are few studies on CBM investigation in Fengfeng Coalfield. In order to better understand the geological controls on CBM in the Fengfeng Coalfield, geological surveys and laboratory experiments were conducted that included coal petrology analysis, proximate analysis, mercury intrusion, low-temperature liquid nitrogen adsorption, coal permeability analysis, and methane adsorption/desorption. The results show that the organic compositions are dominated by vitrinites, followed by inertinites, and minor liptinites. The CBM contents are range between 0.83 and 11.52 m3/t, with an average of 4.72 m3/t. The moisture contents are range from 0.76 to 2.54%, with an average of 1.21%, and the ash yields are range from 11.46 to 24.5%, with an average of 17.07%. Low-temperature nitrogen gas adsorption indicates the micropores provide most of the pore specific surface and the pore volume is mainly determined by small pores and mesopores. The geologic structures, coal-bearing strata, and the coal depositional environments were studied through field geological research and laboratory tests. The coals were deposited in a river-dominated shallow delta environment to form the mudstones or siltstones of the coal roof and floor that were used to seal the CBM. The CBM were mainly generated during stages of the Hercynian–Indosinian and the Early-Middle Yanshanian orogeny. Underground water flowed to the Dashucun Mine and its adjacent mines in the northeast of the Gushan Anticline to form a semi-closed hydrodynamic system that created the CBM emission and preservation. The coal rank increases from the southern to the northern areas. Then, it can be speculated that the CBM formation and preservation conditions in the north are better than in the south. The best prospective targets for CBM are in the northern areas. The results of this study may be useful for CBM exploration in North China.

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Funding

This work was financially supported by the National Key R&D Plan of China (Grant No. 2017YFC0601405), the National Natural Science Foundation of China (41772096), Shandong Province key research and development plan(2019GGX103021), SDUST Research Fund (No.2018TDJH101), and the Approval File of the open fund research in the State Key Laboratory Breeding Base for Mining Disaster Prevention and Control (No. MDPC201712).

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Authors and Affiliations

  1. Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, College of Earth Sciences and Engineering, Shandong University of Science and Technology, Qingdao, China

    Dawei Lv & Changyong Lu

  2. Department of Earth and Planetary Sciences, University of California – Santa Cruz, Santa Cruz, CA, 95064, USA

    Dawei Lv

  3. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, Shandong, China

    Dawei Lv & Zhijie Wen

  4. Shandong Provincial Research Institute of Coal Geology Planning and Exploration, Jinan, 250104, China

    Changyong Lu

  5. Geological Prospecting Institute, First exploration Bureau of China National Administration of Coal Geology, Handan, 056004, Hebei, China

    Hongzhu Song

  6. School of Earth Science and Engineering, Xi’an Shiyou University, Xi’an, 710065, China

    Shuai Yin

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  1. Dawei Lv
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Correspondence to Dawei Lv, Zhijie Wen or Hongzhu Song.

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Lv, D., Lu, C., Wen, Z. et al. Coal-bed methane geology of the No. 2 coal seam in Fengfeng Coalfield, North China. Arab J Geosci 12, 529 (2019). https://doi.org/10.1007/s12517-019-4703-7

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