Some of the sedimentary basins in India have been found to have moderately high temperatures at significant depth, where several wells may be non-flowing and/or abandoned. The Geothermal potential from such wells can be harnessed by traditional two well systems or a single well system. In order to assess the Geothermal potential, design and develop a Geothermal plant, based on the dynamic modelling, OEC has identified areas in Gandhar oil field and in Pakahjan oil field in Gujarat.

Different petro-physical parameters have been calculated with thermal conductivity as final result taking input from well logging data. Based on seismic profiles, stratigraphy from wells and contour maps, a geological structural model has been built for the selected area. Regional temperature model (3D) was created depicting an overview of steady state temperature of the reservoir.

Dynamic modeling results of Gandhar and Pakahjan oil field indicated the radius of influence to be less than 1 km around injection well, and the reservoir has the capacity to sustain a long time heat production for 30 years. As drilling of wells is the most significant component of a Geothermal project cost, in order to reduce the initial development cost, OEC has identified some of the non-flowing/abandoned oil that can be re-used for geothermal application in Gandhar area of Cambay Basin.

ONGC will develop India’s first Geothermal Field Development Project in Ladakh. On 6 February 2021, ONGC Energy Center (OEC) signed a Memorandum of Understanding (MoU) with the Union Territory of Ladakh and Ladakh Autonomous Hill Development Council Leh to implement this. The MoU is the first step towards creating a Carbon Neutral Ladakh and the project will put India on the Geothermal Power map of the World.