Fractal evolution under in situ pressure and sorption conditions for coal and shale.

ABSTRACT: Coalbed methane (CBM) and shale gas become two most important unconventional natural gas resources in US. The fractal dimension, known as the degree of self-similarity or irregularity, is an important parameter to quantitatively characterize gas storage capacity and gas transport properties in pores of rock matrix. In this study, two coal and two shale samples were evaluated to estimate fractal dimensions using combined small angle X-ray scattering (SAXS), small angle neutron scattering (SANS) and low-pressure N₂ adsorption techniques. The results show that surface fractal dimension D _s of inaccessible pores is greater than that for total pores based on SANS results for all four tested samples. D _s of accessible pores estimated by N₂ desorption i

SUBMITTER: Zhang R 

PROVIDER: S-EPMC5566402 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature