Abstract

Traditionally, for low dip stratigraphic setup, extent of subsurface coverage obtained from Offset VSP surveys, so far conducted world wide are governed by the drilled depth (DD) of borehole. In an offset VSP survey, normally to avoid generation and recording of refracted (or mode converted) seismic waves, the energy source is deployed upto of DD, accordingly subsurface coverage available from offset VSP survey is limited to the order of of DD. A new and innovative technique christened as