Abstract: The nonuniform and anisotropy had notable effects on fluid flow and well productivity in the oil reservoirs. It′s supposed that the formation is divided by the discontinuity surface into different areas with different permeability values. The analytic solution of the flow in nonuniform anisotropic reservoir was obtained by the coordinate transformation and the mirror image theory. The flow characters and reservoir engineering analyses were given out. Generally in anisotropic formations, any well and its image were not symmetrical relative to the discontinuity surface. The equal pressure lines were elliptic in the inner areas but erratic near the discontinuity surface. Under the condition that the permeability ratio of the neighboring area and the well area was less than one, the bigger the angle between the discontinuity surface and the maximum principal permeability direction, or the stronger the anisotropy, the smaller the wellcontrolled area and the well production rate, vice versa. When the angle between the discontinuity surface and the maximum principal permeability direction was big, the well should be located far from the discontinuity surface so that its control area and production rates can be increased. When the angle between the discontinuity surface and the maximum principal permeability direction was small, the well should be located close to the discontinuity surface so that the producing reserves near the discontinuity surface and the ultimate oil recovery can be improved.

Key words: discontinuity surface, permeability, coordinate transformation, mirror image theory, reservoir flow analysis, petroleum reservoir engineering