Abstract

Imaging below the Basalt which is highly heterogeneous and having rugose interface is difficult due to loss of seismic energy, attenuation, absorption, scattering and mode-conversion. Reprocessing of vintage 2D lines with improved processing techniques considerably improved the image quality. The stack section guided by interval velocity reversal successfully identified Deccan Trap and sub-trappean Mesozoic sediments below the trap. Well to seismic calibration was carried out for interpreting internal stratigraphy and geometry of structures accurately. This methodology may be helpful in mapping and modelling sub-basalt Mesozoic sequences in entire Western Offshore Basin. Thus interval velocity function can be used as one of the effective seismic tools to confirm imaging below Basalt.