The assessment of hydrocarbon resources have taken off w.e.f October 01, 2015 at seven work centers of ONGC (KDMIPE, GEOPIC, Mumbai, Chennai, Kolkata, Baroda and CEC-OG) with identified basins. The basins, under study, are Mumbai Offshore, Satpura-South Rewa, Kerala-Konkan, Krishna-Godavari, Mahanadi, Cambay, Rajasthan and Vindhyan. G&G, geochemical, petro-physical data collection, their review & QC check, loading in workstation and preparation of basin map in Petrel in progress.