Effects of natural micro-fracture morphology, temperature and pressure on fluid flow in coals through fractal theory combined with lattice Boltzmann method

The fluid flow behaviors during the production of coalbed methane (CBM) are generally restricted by the pre-existing natural fractures in coal seams. To better understand the effect of natural micro-fracture morphology on the flow capability, nine coals collected from Ordos Basin were subjected to optical microscope observations to obtain micro-fractures morphology. And then, the box-counting method (BCM) was used to quantify the complexity of...