Abstract

Meso-Proterozoic Son Valley sector of Vindhyan Basin, with encouraging thermogenic gas flow from several wells, has revealed substantial exploration potential from rocks more than one billion year old and any production to be established would be among the oldest in the world. Drilling of recent wells has opened up a new and regionally extensive Rohtas Limestone play in the Lower Vindhyan sequence of the basin. Though the very tight limestone with low production rate prevented the discovery well Nohta-B as well as subsequent wells from being commercial, the vast unexplored regional extent of the limestone reservoir represents a new opportunity in the basin. The organic activity has been documented in the form of thin algal layers and the sedimentary sequence is thermally over mature. Significant volume of gas appears to have been generated and migrated into reservoirs within multiple petroleum systems and may be available for exploration