Abstract

The Ganga Basin is a poly-history sedimentary basin in northern India, with four main phases of geological evolution. Basement tectonics played an important role during the sedimentation and deformation of the basin. Search for hydrocarbons in Ganga Basin was started by ONGC as early as 1956. So far fifteen exploratory wells in the structures namely Mohand, Saharanpur, Tilhar, Sahajhanpur, Puranpur, Matera, Tisua, Banda and Ujhani, have been drilled to evaluate the hydrocarbon prospects of Tertiary and Pre-Tertiary sequences in Ganga Basin. For the first time, 45m thick effective source rock sequences (2715-40m and 2770-90m) have been identified in the Pre-Tertiary (Ujhani Formation) in Tisua-A and 35m thick potential source rock with very good source characteristics in Tertiary (Siwalik Formation) in Banda-A through geochemical evaluation.