1. PUGA GEOTHERMAL REGION, JAMMU AND KASHMIR
The Puga area in eastern Ladakh, Jammu and Kashmir, is known to be the most promising geothermal field in India, as pointed out by geo-scientific studies in the area. However, lack of deep subsurface information put constraints to the geothermal resource evaluation in Puga. The recent magnetotelluric study in Puga revealed anomalous conductive (~5 Ohm.m) structure at a depth of 2 km in the area of geothermal manifestation. Analysis of temperature logs indicated a high temperature (~260°C) associated with the anomalous conductive structure and signifies potential geothermal resource in the area. We discuss the results in the context of geothermal resource utilization for power generation in the area.
2. TATAPANI HOT SPRING ZONE, SURGUJA DISTRICT, MADHYA PRADESH
Identification of hot geothermal reservoir at great depths (1-5 Km.) is an important task in decision making to establish and use the heat source for power generation etc. as sustainable source for a long time is a necessary requirement. Telluric and magnetotelluric studies were carried out in and around Tatapani hot spring zone. From these studies, the presence of a deep crustal conductor related to geothermal reservoir system at a depth of about 2 km extending in E-W direction is detected. (Ref: NGRI Report No: NGRI-2000-EXP-282)
3. KONKAN GEOTHERMAL PROVINCE, MAHARASHTRA
As in the case of previous study, the northern part of the Konkan geothermal province was investigated jointly by using both telluric and magnetotelluric techniques and identified a deep reservoir (2-3 km) below the volcanic rocks. It is interpreted that meteoric water from the western ghats percolated through deep fractures through normal gravitational force and has emerged as hot springs due to differences in hydrostatic pressures. (Ref: Harinarayana, Ph.D Thesis, 1988, Harinarayana and Sarma, 1999)