The problem on wave field excitation in a well, intersecting a finite size fracture, under action of external seismic field at VSP is considered in the report. The effective analytical model is developed for calculation of the slow fracture mode and for body and tube waves in a well. The direct comparison of wave fields in a well and in a crack calculated by the developed approach and by the finite-difference code shows their good coincidence. The fulfilled calculations showed that the secondary tube waves, generated due to interaction of the external seismic wave with fracture edge, have the same order of amplitudes as for body waves registered in a well at VSP. It allows us to use the secondary tube waves for estimation of hydrofracture size.
A. Derov, G. Maximov, D. Alexandrov
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