The analytical solution of the wellbore pressure in a reservoir which is located near a slanted fault were derived using the method of images and by applying the principle of superposition to the Kelvin's point source solution. The solutions show that the inclination of the flow barrier causes additional pressure drop beyond what is usually considered in the concept of a single mirror image well. The extra pressure drop causes gradual changes on the slope of semi-log plots of pressure versus time. In many cases the behavior resembles that of wells in completely bounded systems. Using the general solution presented in graphical forms, one may estimate the distance to the fault.

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