Pore fractal characteristics and significance of high-rank coal in Southern Qinshui Basin
Abstract：In order to investigate coal reservoir pore structure characteristics which is in favor of coalbed methane exploration and development,the Late Paleozoic high rank coal of Sihe and Zhaozhuang mine in Southern Qinshui Basin is used as research object.The relationship between the total fractal dimension and the fractal characteristics of pore,vitrinite reflectance,Langmuir volume and Langmuir pressure was studied based on cryogenic nitrogen adsorption results.The results show that the pore distribution determined by nitrogen adsorption has obvious fractal characteristic in different aperture.Fractal dimension of pore test by low temperature nitrogen adsorption experiment is 2.47～2.97.There is a positive correlation between fractal dimension and vitrinite reflectance,pore roughness increases with the increase of vitrinite reflectivity.The fractal dimension increases with the increase of the specific surface area,pore volume,micropore and transition pore proportion.Meanwhile,fractal dimension decreases with the increase of the mesopore.The total fractal dimension play an important role in the development of coalbed methane of high rank coal,that is to say the higher the total fractal dimension of high rank coal,the more beneficial to coalbed methane development.
Keywords：Qinshui Basinlow-temperature nitrogen adsorptionpore propertyfractal dimensionLangmuir volume
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 7-15 )