Shear-Wave Dynamic Behavior using Two Different Orientations

Abstract

For laterally complex media, it may be more suitable to take a different orientation of thedisplacement vector of Shear-waves. This may change the sign of several imaginary reflections andconversion coefficients to be used in reservoir characterization and AVO (Amplitude Versus Offset)analysis or modeling. In this new convention the positive direction of the displacement vector ofreflected Shear-waves is chosen to the left of ray tangent (in the direction of wave propagation).Therefore, the definition of the displacement vector of shear-waves can be used properly even forvery complicated media. Finally the shear-wave dynamic behavior of a reservoir zone can beillustrated for laterally varying structures in terms of the amplitude variation and phase behavior usingthis new orientation.