f Hybrid numerical method for seismic borehole problem (SBP) modelling

The SBP is a very up-to-date and important issue whose numerical modelling is rather complex because it involves several major difficulties an intermediary frequency range where neither finite differences nor ray methods seem best suited . - a large ratio between borehole diameter, casing thickness and distance between boreholes without it being possible to ignore their respective influences. - prevailing heterogeneous conditions: Huid, casing and soil formation.