This cooperative project between Oryx and Sandia investigates the effects of rock properties, in situ stresses, and change in effective stress on the deformation and permeability of stress-sensitive, naturally fractured reservoirs. The initial focus is the Austin Chalk, but the study may also include the Bakken shale and other reservoirs of interest. The project has an integrated geomechanics approach involving field work, laboratory studies, and the development of experimental test techniques and analytical models.