The existence of numerous hot springs in Mongolia’s Hangai province is indicative for large geothermal energy resources, which are remnants of the region’s volcanic geological history. Previous studies have shown that a combined, geothermal heat and power plant could provide cheap and clean energy for the province center Tsetserleg. With this project we will introduce the missing geophysical component of the so far conducted geothermal exploration program in the Hangai. We will establish scientific methods to image the geothermal reservoir near Tsetserleg, which feeds the hot springs in Tsenkher and Shivert. The result will be of great importance for promoting the construction of geothermal power plant.
This project is a collaboration between ETH Zurich and the Mongolian Academy of Sciences. It is funded by the Swiss Programme for Research on Global Issues for Development (r4d programme) – a joint funding initiative by the Swiss Agency for Development and Cooperation (SDC) and the Swiss National Science Foundation (SNSF).
Hot rock in the subsurface, a remnant from
Hangai’s volcanic history, heats fluids in the underground. Some of the fluids migrate upwards along permeable geological faults, where they result in hot springs as observed in Tsenkher. This hot spring has a flow rate of more than 10l/s and a temperature that exceeds 80°C.
With this project we conduct magnetotelluric (MT) measurements during two field campaigns in 2019 and 2020. Based on the MT data it is possible to construct a 3-D geothermal reservoir model of the region in order to evaluate the potential for heating and energy production. We will use our new MT geophysical soundings for a consistent interpretation together with previously conducted geochemical and geological studies.
The measurements are conducted in the hot spring area south of Tsetserleg during field surveys in May-June 2019 and 2020. During the first fieldwork phase we conducted magnetotelluric (MT) measurements at 184 sites in the hot spring area south of Tsetserleg on an array with 2 km site spacing. In the 2020 survey we will refine our measurement array in areas were the preliminary 3-D model based on the 2019 measurements indicates promising features that need to be resolved with a higher resolution.
The capacity of a geothermal CHP plant in Tsetserleg could reach 1.9 MWe power and 16.7 MWt heat production as shown in a study by Purevsurem Dorj from the National Renewable Energy Center in Ulaanbaatar (Dorj, 2005 and 2015). Such a plant would even exceed the current power and heat consumption in Tsetserleg. Geothermal energy could be a great benefit to all inhabitants. It would result in massively reduced greenhouse gas emissions and lead to improved live and working conditions.
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Ganbat, E., and O. Demberel (2010), Geologic background of the Hangay geothermal system, West-Central
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Käufl, J. S., et al. “Magnetotelluric multiscale 3-D inversion reveals crustal and upper mantle structure beneath the Hangai and Gobi-Altai region in Mongolia.” Geophysical Journal International (2020).
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