Interference Slow Wave in Poro-Acoustic Biot Layer and Its Potential for the Detection of Subtle Traps

This work proves the existence of an Interference Slow Wave (ISW) in Biot porous acoustic media. The presence of ISW is theoretically established by solving the Biot equation considering a model of one horizontal layer surrounded by two elastic half spaces. The low attenuation of ISW on lower seismic frequencies and its polarizibility in the direction of the layer makes this wave potentially useful for detecting reservoirs consisting of a saturated sandstone layer inside shale in cross-hole surveys.