A major part of the estimated global reserves of hydrocarbons occurs in sediments overlain by thick basaltic sequences which makes imaging structures in the basalt-covered older sediments a key exploration challenge in many frontier areas—e.g., in the west African continental margins, the Atlantic margin of northwest Europe, and a number of Indian basins, both offshore and on land. Saurashtra Peninsula in the western part of India (Figure 1), with thick Mesozoic sediments overlain by thick basalt of the Deccan Trap extruded during Late Cretaceous-Early Paleocene, is one such Indian prospect. However, it is virtually unexplored because of the limitations of conventional P-wave seismic in imaging the structures in the sub-basalt sedimentary sequences and the intrabasalt features.

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