Method and apparatus for quantitatively determining a degree of recirculalion flow in a vessel of a fluid by altering the electrical conductivity of the fluid, sensing the difference in electromagnetic field after the fluid is altered, and integrating the sensed difference over a period of time including any time of potential recirculation of any altered conductivity fluid. The comparative evaluation enables individuals to select one or more funding alternatives appropriate to their particular set of circumstances. Bed boundaries of the formation are first identified.