Abstract: A methodology for spatially identifying conductive regions using pressure transience for characterizing conductive fractures and subsurface regions is provided. Hydraulic fracturing is utilized to create fractures within a reservoir, thereby increasing fluid permeability of the reservoir and permitting hydrocarbon fluids to flow into a wellbore and subsequently to be produced from the hydrocarbon reservoirs. The geometry, dimensions, and extent of the fractures may significantly impact the production characteristics of the well. However, given that fractures are thousands of feet below the surface, measuring the properties of the fractures can be difficult. In order to characterize the fractures, including determining locations of conductive fractures in the subsurface, sensors are positioned in monitoring wells. Pressure changes are then induced in a well, with the sensors measuring the effect of the pressure changes.