Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 1-8.doi: 10.12108/yxyqc.20210201

• PETROLEUM GEOLOGY •     Next Articles

Adsorption characteristics of typical coal reservoirs in Inner Mongolia

YAO Haipeng1,2,3,4,5, YU Dongfang1,2,5, LI Ling1,2,5, LIN Haitao1,2,5   

  1. 1. Coalfield Geological Bureau of Inner Mongolia Autonomous Region, Hohhot 010000, China;
    2. Research Center of Unconventional Natural Gas Engineering Technology in Inner Mongolia Autonomous Region, Hohhot 010000, China;
    3. Key Laboratory of Coalbed Methane Resources and Accumulation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;
    4. College of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;
    5. Inner Mongolia Coal Exploration Unconventional Energy Co., Ltd., Hohhot 010000, China
  • Received:2020-01-28 Revised:2020-09-28 Online:2021-04-01 Published:2021-03-31

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Abstract: In order to study the adsorption characteristics of typical coal reservoirs of different coal ranks in Inner Mongolia,coal samples from three representative areas including the northern areas in Ordos Basin,Baiyinhua coalfield in Erlian Basin group and Yakeshi-Wujiu coalfield in Hailar Basin group were conducted isothermal adsorption tests at different temperatures and pressures. The results show that:(1) Under the reservoir temperature, the adsorption capacity of long flame coal in Yakeshi-Wujiu coalfield is the strongest,followed by high-rank coal in northern Ordos Basin,and the adsorption capacity of lignite in Baiyinhua coalfield is the smallest.(2) The adsorbability of the three coal samples decreased with the increase of temperature,and it decreased rapidly within a certain temperature range called sensitive temperature. The sensitive temperature of coal reservoirs in northern Ordos Basin is the highest,followed by Yankeshi-Wujiu coalfield and Baiyinhua coalfield.(3) The variation of the number of hydroxyl and carboxyl functional groups and the stress compaction are the main factors affecting the adsorption capacity of coal reservoirs.(4) The difference of adsorptive sensitivity temperature of coal reservoir is closely related to coal metamorphism and pore structure. In northern Ordos Basin,the coal metamorphism reaches lean coal stage,and the coal reservoir is with poor connectivity and dominantly developed nano-sized pores,with high adsorption sensitivity temperature. In Yakeshi-Wujiu coalfield,the coal metamorphism reaches long flame coal stage,and the coal reservoir is with good connectivity and dominantly developed nano-sized pores,with medium adsorption sensitivity temperature. In Baiyinhua coalfield,the coal is not metamorphosed and is in lignite stage,and the coal reservoir is with good connectivity and well-developed nano-micron pores, with low adsorption sensitive temperature. The research results provide other possibilities for coal reservoir transformation, makes it no longer limited to fracturing technology.

Key words: coal reservoirs, adsorbability, isothermal adsorption, sensitive temperature, Ordos Basin, Erlian Basin, Hailar Basin

CLC Number: 

  • TE122
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