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Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (11): 1603-1614.doi: 10.11764/j.issn.1672-1926.2020.05.005

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Characteristics on pore structures on full scale of lignite and main controlling factors in Hailar Basin

Qing YANG1(),Jian LI1,Wen-guang TIAN1,Bin SUN1,Jie ZHU2,Yu-hang YANG2   

  1. 1.PetroChina Research Institute of Petroleum Exploration & Development，Beijing 100083，China
    2.China University of Mining & Technology（Beijing），Beijing 100083，China
  • Received:2020-03-03 Revised:2020-04-28 Online:2020-11-10 Published:2020-11-24

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Abstract:

Pore structure characteristics of coal are one of the key factors for gas storage judgement of coal reservoir. The fine characterization of pore structure is of great significance for the identification of high-quality reservoir in thick coal seams. However，it is difficult for lignite reservoir to fully characterize the reservoir space characteristics by a single means. On the basis of scanning electron microscope （SEM）， the full pore size structure of lignite samples of the Lower Cretaceous Yimin Formation in Hailaer Basin was characterized by using the complementary analysis of low-temperature liquid nitrogen adsorption experiment and high-pressure mercury injection experiment in pore size detection range and accuracy， and the influencing factors of pore structure of lignite were discussed. The results show： （1） The total pore volume and total pore area of coal samples in the study area are significantly different with the pore size distribution. The contribution of pore volume of coal samples from Yimin Formation is mainly from macropores； and adsorption area is mainly provided by micropores and transition pores. The main contribution of the pore volume of Yakeshi coal samples comes from the micropores and transition pores which contribute 99.73% of the total pore area. （2） The increasing increase of huminite is beneficial to the development of micropores and transit-pores. The increasing increase of inertinite content contributes to the development of mesopore and macropores. （3） The tissue preservation index and vegetation index of coal samples have a positive correlation with the total pore volume， and a negative correlation with the total pore area； the total pore volume decreases with the increase of gelification indices， and the change rule of the total surface area is opposite； the relationship between the groundwater influence and the total pore volume and the total pore area is not obvious. （4） The coal forming environment is dry forest swamp with an oxidation environment， forming a pore structure with abundant plant tissue pores， medium pores and macropores， and the pore morphology is mainly trough pores or slit pores. The coal forming environment with wide scales and deep of overlying water is characterized by high degree of gelatinization and decreasing primary tissue pores of coal seams. Mesopores and macropores are preferentially filled with minerals， contributing to the specific pore structure with lower pore volume and higher specific surface area.

Key words: Lignite coal, Pore characteristics, Pore volume, Specific surface area, Coal facie, Coal-forming environmentFoundation items： The National Science and Technology Major Project （Grant No. 2016ZX05041-004）, The Major science and technology projects of Petrochina Co.Ltd.“Research and application of key technologies for coalbed methane exploration and development”（Grant No. 2017E?14）

CLC Number: 

  • TE121.1+3
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