Reservoir Studies at Tatapani Geothermal Field, Surguja District, India

Abstract

Tatapani geothermal prospect is a promising geothermal resource in Surguja district, Chhattisgarh State. Total 26 boreholes were drilled in this area, out of which five boreholes produce hot water. The five boreholes, drilled upto the depth of 350m, initially produced 1800 lpm of thermal water with maximum temperature of 112.5? C. At present, four boreholes have free flow discharge of 1159 to 1224 lpm. Thermal logging of the boreholes has indicated presence of thermal anomaly along ENE- WSW direction. The thermal gradient data and well testing data suggest that the reservoir may continue below 1000 m depth. The isotherms at 300m, 100m and 1500 m depths indicate that the aerial extent of the reservoir increases with depth. The thermal logging data suggest that the reservoir may have temperature of 150?C, at the depth of >1500m. The ENE extension of the reservoir and it's depth persistence needs to be verified by deeper exploration to augment the presently established resource potential of 300 Kwe upto the depth of 350m.