Nuclear magnetic resonance (NMR) has been applied widely and successfully in
conventional and unconventional reservoirs, and can be used to investigate petrophysical …

In this review we focus on the technology associated with low-field NMR. We present the
current state-of-the-art in low-field NMR hardware and experiments, considering general …

Eleven coal samples of different metamorphism are studied with regard to their pore
structures. Both low-pressure nitrogen gas adsorption (LP-N 2 GA) and scanning electron …

The pores/fractures are places for gas migration and storage in coal. Their structure
complexity will directly influence the pore structure parameters and gas seepage properties …

There has been a long history of using X-rays to visualize coal and its transitions during
various treatments. Advances and improved availability has allowed the application of X-ray …

Freezing and thawing cycles occur with cyclic liquid nitrogen (LN2) injection in coal. The
freeze–thaw treatment damages the pore structure of coal and thus increases its …

Exploitation of coalbed methane (CBM) has dual advantages of not only providing
alternative clean-energy but also effectively reducing the proneness for gas outbursts. CBM …

Shale reservoir is characterized by complex pore networks, within which there are various
pore fluids including unrecoverable fluid, capillary bound fluid and movable fluid. Although …

Investigation of coal microstructure based on 3D reconstruction is of great significance to the
development of coalbed methane and the spatial migration of fluids in coal. In this paper …

Pore size distribution of the coal is an important parameter for reliable prediction of coalbed
methane production which controls both diffusion (desorption time) and seepage (relative …