Abstract
As a new green energy source, geothermal resource’s exploration, development, and utilization are an important direction in geophysical exploration at present. In this study, the actual land surface temperature was inferred based on the thermal infrared band of Landsat8 remote-sensing images, and the information about the surface anomalies and their spatial distribution was obtained through a multifactor analysis. In addition, three magnetotelluric sounding profiles were deployed in the study area, and the geo-electric sections in the study area were obtained through inversion of the measured data. Then, based on the inverse geo-electric information and the land surface temperature anomaly information, we analyzed and verified the geothermal resource genesis of the thermal anomaly area and inferred the favorable geothermal resource area in the study area. The results show that these two methods can be used to compare and analyze the possible distribution of the geothermal resources in the study area in two dimensions: the spatial distribution on the surface and the vertical distribution in the subsurface. Moreover, the results of the geothermal anomalies inferred from the thermal infrared remote sensing and the geo-electric results inferred from the magnetotelluric data are in good agreement. This study demonstrates that the integrated application of thermal infrared remote sensing and magnetotelluric technology is a promising tool for geothermal exploration.
Highlights
Since geothermal energy is an important green energy resource, its development and utilization have received increasingly widespread attention
Geothermal-resource exploration methods are mainly based on traditional geophysical prospecting methods, and many studies have been conducted on underground temperature anomaly exploration
Thermal infrared remote sensing has the advantages of a large area of continuous observation and low costs, and it does not destroy the thermodynamic state of the surface, making it the current advanced method of geothermal resource surveying
Summary
Since geothermal energy is an important green energy resource, its development and utilization have received increasingly widespread attention. Thermal infrared remote sensing can monitor the spatial-distribution characteristics of the land surface temperature (LST) and is an important means of obtaining information about LST anomalies. Thermal infrared remote sensing has the advantages of a large area of continuous observation and low costs, and it does not destroy the thermodynamic state of the surface, making it the current advanced method of geothermal resource surveying. By studying the Chili geothermal field, the intersection between various surface manifestations of geothermal reservoirs and how remote sensing indicators can contribute to exploration were illustrated. Few studies have been conducted on the direct use of thermal infrared remote sensing to obtain LST anomaly information and to synergistically analyze the geothermal resource prospects by using field survey data. Favorable geothermal areas were identified to provide effective suggestions for subsequent development of these geothermal resources
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