Insights into Controlling Factors of Pore Structure and Hydraulic Properties of Broken Rock Mass in a Geothermal Reservoir

Abstract The filled broken rock mass in a geothermal reservoir under high-pressure work fluid and overburden stress is of great significance to the efficient operation system. pore structure hydraulic properties were quantitatively investigated by nuclear magnetic resonance (NMR) technology non-Darcy models. at lower compressive levels shows stronger compressibility, gangue with more small particles sensitivity. seepage pores can be characterized fractal theory, dimension ranges from 2.749 2.861, which positively correlated stress. increase Dp attributed shrinkage macropores affected increasing flow high pressure gradient significant nonlinearity verified Forchheimer equation Barree-Conway equation. We proposed logistic regression model characterize effects GSD on permeability characteristic parameter nonlinear mass, provides potential method for evaluating performance system based mass.