Heat flow in Godavari Gondwana Basin and its implication in the assessment of geothermal resources

Autor: Prajapati, Sandeep Kumar, Ray, Labani, Sakhare, Vishal Vasantrao, Chopra, Nishu, Biswal, Bishnu Prasad, Sidagam, Eswara Rao
Jazyk: angličtina
Rok vydání: 2023
Zdroj: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Popis: The Godavari is one of the largest Gondwana basins in India and developed by the extensional tectonic activity of the intra-cratonic continental rift of Paleoproterozoic age. It is situated between the Dharwar and Bastar cratons. In the present study, temperature measurementswere carried out in the southeastern part of the basin from two deep boreholes (up to 1000 m) and the maximum temperature observed is 81 oC. Thermal conductivity of 60 core samples representative of major lithologies penetrated by the boreholes was measured under steady-state conditions. The average thermal conductivity is lowest for shale and siltstone, intermediate for sandstone, and highest for quartzite. The estimated heat flow values range between 70 and 95 mWm-2. Considering the previous studies, heat flow in the southeastern and southern part of the basin (64-104 mWm-2 with a mean of 86 mWm-2, N=5) is comparatively higher than western part (52-84 mWm-2 with a mean of 63 mWm-2, N=5). Geophysical studies (magneto-telluric and gravity) along with the thermal data indicate that the high heat flow in the southeastern and southern parts of the basin could be due to the existence of geothermal reservoir in the basement and water circulations in the sedimentary formations along the fault/fracture systems. Hot springs with a maximum water temperature of ~81 o C in the region also supports the observed high heat flow. The present data will be used to construct a subsurface thermal model of the basin which will further be utilized in assessing the geothermal reservoir of the region.
The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
Databáze: OpenAIRE
Externí odkaz: