Editor's note: Vladimir Grechka performed this research while with the Center for Wave Phenomena at Colorado School of Mines. Jan Ove Hansen was previously with Schlumberger Stavanger Research.

The technology of ocean-bottom surveys has put mode-converted waves at the forefront of seismic exploration and reservoir characterization. For example, PS-waves proved effective in imaging offshore reservoirs screened by gas clouds that cause high attenuation/scattering of compressional energy (e.g., Thomsen, 1999). Also, information about shear-wave velocities contained in converted modes can be used to separate the effects of saturation and pressure and reduce uncertainty in predicting lithology and fluid saturation. The...

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