India’s Hydrocarbon Outlook 2024 44 A Report on Exploration & Production Activities 4. SAURASHTRA BASIN Saurashtra is a Category II basin, implying that the basin has sub-commercial discovered inplace, potential to be commercially produced. The basin is geologically contiguous with Kutch basin and separated by the Saurashtra Arch in the offshore part, which trends N/NW- S/SE direction.The basin has presence of prospective plays of Middle Jurassic to Early Cretaceous with significant potential of sub-basalt Mesozoic plays. There has been a gas discovery in Early Cretaceous reservoirs at 4,500m depth, below 2,500m thick weathered basalts. The northerly located proven Tertiary Plays of Kutch basin is extended into this basin. Major part of Saurashtra mainland is covered with Deccan Trap basalts with thin veneer of Miocene and younger sediments, exposed along Porbandar coast. The Cenozoic sediments Source: DGH Internal Source: DGH Internal Onland sub-basin partially overlaps with the state(s) of Daman & Diu and Gujarat. have been encountered in the wells drilled in the offshore Saurashtra basin. In offshore, the basin lies north of Mumbai Offshore Basin, while the onland part borders with Cambay Basin on its eastern flanks. The deeper offshore Saurashtra borders with the Indus fan. Two wells have been drilled in the onland part of the basin viz., Lodhika-1 and Dhandhuka-1. The granitic basement has been encountered in well Dhanduka-1 near to the western margin fault. Also, basalt/dolerite dykes and sills are frequently present in the sandstone beds of Wadhwan and Dhrangadhra Formation in these two wells. The basin was built with Pre-Cambrian basement overlain by Mesozoic sediments followed by Deccan traps. A thin cover of Neogene and Quaternary sediments occurs at the top. The drainage of Saurashtra shows a radial pattern from the central highland. The source rocks maturity of Cretaceous is poor and it remains immature in onland.
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