doi:10.16186/j.cnki.1673-9787.2019110017

Received:2019/11/05

Revised:2020/01/13

Published:2021/03/15

Study on the characteristics of high-rank coal pore and fracture based onmercury injection and image processing technology

WEI Jiang1, PAN Jienan1, LIU Fayi2, WANG Kai1, ZHAI Yingquan1, WANG Xianglong1

1.Institute of Resources and Environment， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China;2.The Hudi Coal Industry， Shanxi Jincheng Anthracite Mining Group ， Jincheng  048000 ， Shanxi， China

Abstract:In order to study the pore and fracture characteristics of the coal reservoirs in the southern Qinshui basin， the mercury injection experiment， hand specimen description and scanning electron microscopy were comprehensively used to analyze the pore and fracture of coal samples in the southern Qinshui basin. The results showed that the micropores were relatively developed in the coal seam in the southern Qinshui basin， and the mesopores and macropores were not developed， It could be seen that in the southern Qinshui basin， the micropore and small pore volume of the coal sample were most developed， accounting for 63 %~75%of the total pore volume， followed by the large pore volume， accounting for 19% ~ 28% of the total pore volume， and the middle pore volume was the least developed， indicating that the coal reservoirs were favorable to the occurrence of coalbed methane in this area， but coal reservoir permeability was poor. The area was mainly developed with endogenous fracture， and the exogenous fracture was not developed. The permeability of the coal reservoirs was evaluated by using the fracture aperture parameters in the four mining areas. It was found that the permeability from small to large was Gaohe mine， Chengzhuang mine， Changping mine and Zhaozhuang mine， respectively. The research results had certain significance for the exploration and development of coalbed methane.

Key words:southern Qinshui basin;high-rank coal;pore and fracture;permeability;mercury injection experiment

 基于压汞及图像处理技术的高阶煤孔裂隙特征研究_魏江.pdf