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Abstract

Summary

For geothermal exploration, the ability to detect temperature gradients and heat sources underground is crucial. The pulsed EM technology is capable of detecting differences in rock types and the presence of fluids, which are important indicators of potential geothermal resources. In the context of finding geothermal heat, the pulsed EM technology has been trained to measure heat directly. It can aid in identifying key geological structures associated with geothermal activity, such as volcanic rocks or fault zones that might channel hot fluids. This information can be useful for inferring areas with potential geothermal activity. The technique shows great potential as a digital predrilling method for complementing direct geothermal exploration methods such as temperature gradient drilling or geothermal well logging.

In this article we present a noninvasive method for the remote monitoring of subsurface temperature using low frequency EM pulses. Conventional ground penetrating EM [ ] has limited applications for subsurface measurements in oil fields due to electromagnetic losses, which are rather high in the commonly used frequency range of 50 to 1000MHz, resulting in a rather shallow exploration depth.

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2024-11-04
2026-03-10

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References

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Monitoring Subsurface Temperature Gradients Using Pulsed Electromagnetic Waves and Machine Learning
Conference Proceedings 2024, 1 (2024); https://doi.org/10.3997/2214-4609.202421017
/content/papers/10.3997/2214-4609.202421017
/content/papers/10.3997/2214-4609.202421017
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