Abstract

Integration of land and marine gravity-magnetic data from the Kutch offshore and onland has been used to study prospectivity of Pre-Oligocene and Mesozoic sediments, likely distribution and thickness of traps and subtrappean sediments and also to understand the structure and tectonics of the area. A broad gravity low characterizing the sedimentary basin have been observed over the inner shelf platform area of Kutch offshore which has its extension in Kutch and Saurashtra onshore areas. Gravity modeling has been attempted along selected profiles connecting drilled wells to bring out density model for the basin, constraining the model from borehole information and observed gravity anomalies. The same density model of the basin was extended inside the gravity low depicting the Mesozoic basin. The modeling study reveals presence of thick porous sedimentary layer of about 2.0 to 3.0 Km thick below trap in the area of gravity low. Thus the gravity modeling study has confirmed that the Mesozoic basin with large areal extent exists in Kutch offshore, which has got its extension in Kutch and Saurashtra coastal areas. This prospective Mesozoic basin has been identified by a broad gravity low exhibiting mass deficient zone employing lowering of density. The