A three-dimensional poroelastic model is developed to investigate the poroelastic effect of fluid injection into a geothermal reservoir. In the model, the fluid flow in the fracture is assumed to be lubrication flow and modeled by the finite element method. The three-dimensional pore fluid diffusion in the reservoir and the induced stresses are modeled by the boundary integral equation method. The numerical results have been verified through comparing to the analytical solutions given in Nygren and Ghassemi (2006) for an infinite radial fracture problem. Thereafter, the numerical model is used to study the pore pressure and stress fields in the rock matrix resulting from injection/extraction in a circular fracture.

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