Nonlinear interaction of seismic waves in the lab: A potential tool for characterizing pore structure and fluids

摘要: As more and resources are extracted from unconventional reservoirs, an understanding of the microstructure reservoir rocks is increasing importance. Many conventional techniques struggle to sense variations in micro-structure pore-fluids rock samples. The nonlinear coupling two elastic waves known be sensitive these parameters, however, so a natural candidate improve our structures. Here, we develop experimental technique interaction propagating waves: strong S-wave pump that changes (minutely) properties sample weaker P-wave probe senses those changes. By measuring delay traveltime induced by pump, show this signal significant Berea sandstone absent Aluminum Plexiglass polarization (particle motion aligned or perpendicular probe) has large impact on measured response; evidence measure rock. We method fluids imaging specific caused introduction fluid into sample.