Pore Structure Multifractal Characteristics of Coal Reservoirs in the Central and Eastern Qinshui Basin and Influencing Factors

The heterogeneity of the pore structure coal reservoirs affects desorption and diffusion characteristics coalbed methane, determining its distribution law is conducive to improving theory methane development. central eastern parts Qinshui Basin are rich in resources, but not clear. NMR has advantages being fast, non-destructive full-scale, multifractal can describe self-similarity T2 curve at different scales so as analyze complexity distribution. Based on this, 15 samples with ranks were collected from (Ro,max between 1.54 2.78%), quantitative characterization experiments such low-field nuclear magnetic resonance (LF-NMR) low-temperature liquid nitrogen adsorption (LTN2A) conducted. theory, was quantitatively evaluated, influencing factors elucidated. results showed that BJH volume study area ranged 0.0005–0.0028 cm3/g, an average 0.0014 BET specific surface 0.07–2.52 m2/g, 0.41 m2/g. spectrum peaked 0.1–1, 10–100 100–1000 ms, mostly bimodal or trimodal, indicating pores sizes developed. There great differences ranks; high-rank dominated by micropores, proportion mesopores macropores medium-rank higher. obvious characteristics, fractal sparse region (low-value information) more significant; they had a stronger influence space. Pore closely related degree coalification, increase it lithotype quality, high mineral inertinite contents lead enhancement reservoirs, while Ro,max, Mad vitrinite group have opposite effects. research provide theoretical guidance for subsequent exploration development region.