Abstract

Venturing into seismically virgin area where neither seismic nor well data is available is always a challenge and full of exploration risks. The recent developments in seismic software technology and powerful interactive workstations allow us to pre-plan any seismic data acquisition scheme in such areas with greater confidence. This paper deals with such a seismic campaign in Jalalpur area of Cachar district in Assam, which is part of a tectonically very complex Cachar Fold Belt system of Assam. The available subsurface geological model was utilized for ray trace modeling studies utilizing GX2 software prior to fixation of seismic acquisition parameters. The results from the model studies and follow- up field experimentation work have helped in refinement of a suitable survey design. The initial results from processing of the data acquired in the field has brought out the subsurface picture with greater clarity in comparison to the old data in the southern part of the study area while providing very useful data linkage to the virgin area in the northern most part of the study area. The objective for which the data was collected was to delineate/ confirm the northern limb of an anticlinal feature in the subthrust Bhuban and Renji Formations and the material presented in this paper suggests that the same has been achieved with reasonably good success