Seismoelectric Coupling Equations of Oil-Wetted Porous Medium Containing Oil and Water

For porous medium containing multiphase fluid, such as oil-wetted with oil–water dual phase its fluid interface will also produce electric double layer (EDL), which play a role in the seismoelectric effects. At this time, principle of effects is more complex. The existing theory for Pride used water-saturated formation, cannot meet actual needs theoretical research exploration formation fluid. Carbonate formations are often oil-wetted; therefore, it necessary to study electrokinetic In paper, we treated mixture an effective and solved elastic parameters extended Biot equations case We calculated electromagnetic derived macroscopic coupling electroseismic effects, proposed new coefficients deduced functions magnetic fields relative solid displacement homogeneous medium, studied polarization characteristics field. use simulate logging while drilling model under excitation multipole sources. influence drill collar wave on acoustic field different sources was investigated, has certain guiding selection tools.