The shallow water blocks are on the west coast while the 12 on-land blocks are spread across eight basins - Assam, Arakan, Cambay, Rajasthan, Kaveri, Ganga valley, Vindhya, Deccan and Krishna-Godavari.
Road shows to attract investors will be held in New Delhi on January 18, London (January 20-21), Dubai (January 24-25), Houston (January 31 and February 1) and Calgary (February 3-4).
Digital data rooms are being set up in New Delhi, Houston, London, Calgary and Dubai.