Vp/Vs Crossplots identify reservoir fluids

Field examples from the Western Desert of Egypt show the effectiveness of compressional-wave velocity (Vp) and shear-wave velocity (Vs) crossplots for identifying the type of fluid contained in a formation.Vp/Vs crossplots can distinguish between water, oil, and gas-saturated zones and therefore provide an additional tool for identifying fluids, especially in formations with little history.The industry uses sonic travel time of a compressional wave as a tool for determining formation porosity, while the shear-wave travel time helps determine the mechanical rock properties.A compressional wave also is sensitive to the type of fluid saturating the pore space. But the fact that compressional...

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