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Multicomponent Versus Classical Geothermometry: Applicability of Both Geothermometers in a Medium-Enthalpy Geothermal System in India

  • Sitangshu ChatterjeeEmail author
  • U. K. Sinha
  • B. P. Biswal
  • Ajay Jaryal
  • Suraj Patbhaje
  • Ashutosh Dash
Original Article
  • 19 Downloads

Abstract

The Manuguru geothermal area, located in the Khammam district of Telangana state, India, is one of the least explored medium-enthalpy geothermal systems in India. In this study, subsurface reservoir temperature was estimated by applying various methodologies such as chemical geothermometry, multicomponent geothermometry and mixing models. Chemical geothermometers provided wide range in temperature estimation, and most of them (Na–K, Na–K–Ca, Mg-corrected Na–K–Ca) were found to be unsuitable for predicting reservoir temperature due to the absence of attainment of equilibrium between suitable mineral pairs. The temperature range estimated from the quartz geothermometers varied from 72 to 120 °C which matched closely with values obtained from K–Mg geothermometers. To overcome this problem and to better constrain the reservoir temperature, multicomponent solute geothermometry modelling was carried out by applying the GeoT computer code. Fluid reconstruction was done after taking into account both the degassing and mixing phenomena. GeoT modelling of the reconstructed fluid provided excellent clustering of the minerals. From the GeoT modelling study, it was found that minerals like quartz, chalcedony, calcite, etc., attained simultaneous equilibrium with thermal waters in the temperature range of 130 ± 10 °C, which can be taken as the most probable reservoir temperature. The subsurface temperature (137 °C) obtained from the mixing model further validated the results obtained from multicomponent geothermometry. This integrated multicomponent method and the simulation program used in this study take into account various processes (i.e. mixing, degassing, non-attainment of equilibrium, etc.) which affect the composition of the thermal fluids during its ascent to the surface. The statistical approach of ‘best clustering minerals’ used in this model helps to overcome the problems encountered in applying cation or single-component geothermometers in the medium-enthalpy geothermal systems.

Keywords

India Thermal waters Chemical geothermometers Multicomponent geothermometry Mixing model 

Notes

Acknowledgements

The authors (SC, AJ and UKS) wish to acknowledge Dr. P.K. Pujari, AD, RC&IG, for his support and contribution during the study. The tritium measurements carried out by Shri H.V. Mohokar and Smt. Diksha Pant are also gratefully acknowledged. The authors would like to thank all the officers of GSI associated with this project for their active cooperation in this study.

Supplementary material

10498_2019_9355_MOESM1_ESM.docx (316 kb)
Supplementary material 1 (DOCX 315 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Isotope and Radiation Application DivisionBhabha Atomic Research CentreMumbaiIndia
  2. 2.Homi Bhabha National InstituteMumbaiIndia
  3. 3.Geological Survey of India, Central RegionNagpurIndia
  4. 4.Radiopharmaceuticals DivisionBhabha Atomic Research CentreMumbaiIndia

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