Assessment of micro-pore structure fractal model evaluation of low-rank coal reservoirs
Received date: 2017-10-25
Revised date: 2017-11-30
Online published: 2018-02-10
This article takes low-rank coal reservoirs in the southern margin of Junggar Basin as a research object.Based on the mercury intrusion method,a comparative and quantitative study of heterogeneity of pore structure in low-rank coal reservoirs is carried out by using three fractal models.Fractal dimension Dhas no obvious correlation between Dmand Ds,and less correlation between pore connectivity of coal and rock reservoirs.But with the increase of fractal dimension Dm,Ds has a tendency to increase,and with the increase of Dm and Ds,the connectivity of micro-pores in coal reservoirs is also obviously better than that of medium and large pores.The fractal dimensions of different fractal models have different geological significance for low-rank coal reservoirs,the fractal dimension (D) of the fractal porous model mainly indicates the effect of large-scale pore on pore volume change,but it does not reveal the change rule between fractal dimension and physical properties of coal reservoir.The fractal dimension (Dm) of classical geometry model is mainly characterized by pore space variation,and pore volume decreases with the increase of Dm.Fractal dimensions of fractal model of the thermal (Ds) indicates pore surface roughness,surface tension of pore increases along with Ds,and pore surface has the greater roughness.Low porosity and permeability of low-rank coal reservoir,and micro-pores with relatively good connectivity increase the volume of the connected pores.According to the geological significance of the fractal dimension of different fractal models,the variation law of low-rank coal reservoir permeability can be characterized by different fractal models according to different permeability ranges,which provides a geological basis for the extraction of coalbed methane and the prediction of effective permeability for low-rank coal.
Wang Xiao-yao,Zeng Lian-bo,Zhou San-dong,Shi Jin-xiong,Tian He . Assessment of micro-pore structure fractal model evaluation of low-rank coal reservoirs[J]. Natural Gas Geoscience, 2018 , 29(2) : 277 -288 . DOI: 10.11764/j.issn.1672-1926.2017.12.004
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