Abstract

The Deep resistivity sounding (DRS) studies in Saurashtra have brought out very important results with regard to broad general distribution of thickness of trap, sediment and basement topography. The sediments are characterized by resistivity of less than 60 ohm-m, traps of 100-600 ohm-m and basement of high resistivity above 1000 ohm-m. Presence of sedimentary basin is detected between Jamnagar and Mewasa having a maximum thickness of sediments aligned in NW-SE direction covering Vadali-Mulila area. This basin appears to be most promising area for future exploration. A thicker sedimentary sequence is also inferred in west and southwestern part of Lodhika well. The thickness of Mesozoic sediments is estimated to be about 1400 m between Dhrangadhra-Kamalapur region in the northern part of Saurashtra. It is observed that the trap thickness is more than 1000 m between Jamnagar and Mewasa and less than 600 m in the Dhrangadhra-Kamalapur area and ~2000 m in Lathi-Ansador region. Presence of a number of hidden volcanic plugs in the area of Porbandar-Navibandar, Kutiyana, Junagadh and Rajula region are observed. Some of these plugs are not exposed at the surface and could be an extension of famous Girnar, Barda and Alech hills at depth.