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Open AccessArticle

Estimations of Fracture Surface Area Using Tracer and Temperature Data in Geothermal Fields

1
Institute of Fluid Science, Tohoku University; 2-2-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
2
Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University; 6-6-11-709 Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(10), 425; https://doi.org/10.3390/geosciences9100425
Received: 7 June 2019 / Revised: 23 August 2019 / Accepted: 3 September 2019 / Published: 1 October 2019
(This article belongs to the Special Issue Subsurface Thermography and the Use of Temperature in Geosciences)
Reinjection is crucial for sustainable geothermal developments. In order to predict thermal performances due to cold-water injection, a method was developed to estimate effective fracture surface areas (i.e., heat transfer areas). Tracer response curves at production wells are analyzed to determine flow rates and pore volumes, and the fracture surface areas are optimized by short-term thermal response curves. Because the method erases fracture apertures from the equation by combining mass and heat transfer equations, the fracture surfaces can be analyzed without assuming that the fracture shape is a parallel plate. The estimation method was applied to two geothermal field datasets: One involved an artificially created reservoir, and the other involved a naturally occurring reservoir. The estimated heat transfer areas are reasonable in the field geometries. Once the fracture surface area is estimated, the future temperature change and power generation can be predicted. This can provide a simple and quick method to design reinjection strategies. View Full-Text
Keywords: geothermal; injection; tracer; field data; flow paths; optimization geothermal; injection; tracer; field data; flow paths; optimization
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MDPI and ACS Style

Suzuki, A.; Ikhwanda, F.; Yamaguchi, A.; Hashida, T. Estimations of Fracture Surface Area Using Tracer and Temperature Data in Geothermal Fields. Geosciences 2019, 9, 425.

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