The extract and residue were acquired by CS 2 −NMP (1:1, v/v) ultrasonic extraction of Malan No. 8 coking coal. The chemical structure models were constructed based on elemental and structural analyses of 13 C NMR, Fourier transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) using 13 C chemical shift calculations.
For the purpose of investigating the fractal characteristics of pores in Taiyuan formation shale, a series of qualitative and quantitative experiments were conducted on 17 shale samples from well HD-1 in Hedong coal field of North China. The results of geochemical experiments show that Corresponding author. This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 4.0 (CC-BY) License. Further distribution of this work is permitted, provided the original work is properly cited.
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K. Li et al.Total organic carbon (TOC) varies from 0.67% to 5.32% and the organic matters are in the high mature or over mature stage. The shale samples consist mainly of clay minerals and quartz with minor pyrite and carbonates. The FE-SEM images indicate that three types of pores, organicrelated pores, inorganic-related pores and micro-fractures related pores, are developed well, and a certain number of intragranular pores are found inside quartz and carbonates formed by acid liquid corrosion. The pore size distributions (PSDs) broadly range from several to hundreds nanometers, but most pores are smaller than 10 nm. As the result of different adsorption features at relative pressure (0-0.5) and (0.5-1) on the N 2 adsorption isotherm, two fractal dimensions D 1 and D 2 were obtained with the Frenkel-Halsey-Hill (FHH) model. D 1 and D 2 vary from 2.4227 to 2.6219 and from 2.6049 to 2.7877, respectively. Both TOC and brittle minerals have positive effect on D 1 and D 2 , whereas clay minerals, have a negative influence on them. The fractal dimensions are also influenced by the pore structure parameters, such as the specific surface area, BJH pore volume, etc. Shale samples with higher D 1 could provide more adsorption sites leading to a greater methane adsorption capacity, whereas shale samples with higher D 2 have little influence on methane adsorption capacity.
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