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A methodology for using borehole temperature-depth profiles under ambient, single and cross-borehole pumping conditions to estimate fracture hydraulic properties

Maria Klepikova 1 Tanguy Le Borgne 1 Olivier Bour 1 Philippe Davy 2
1 Transferts d'eau et de matière dans les milieux hétérogènes complexes
GR - Géosciences Rennes : GR9
2 GR - Géosciences Rennes
Abstract : Temperature profiles in the subsurface are known to be sensitive to groundwater flow. Here we show that they are also strongly related to vertical flow in the boreholes themselves. Based on a numerical model of flow and heat transfer at the borehole scale, we propose a method to invert temperature measurements to derive borehole flow velocities. This method is applied to an experimental site in fractured crystalline rocks. Vertical flow velocities deduced from the inversion of temperature measurements are compared with direct heat-pulse flowmeter measurements showing a good agreement over two orders of magnitudes. Applying this methodology under ambient, single and cross-borehole pumping conditions allows us to estimate fracture hydraulic head and local transmissivity, as well as inter-borehole fracture connectivity. Thus, these results provide new insights on how to include temperature profiles in inverse problems for estimating hydraulic fracture properties.
Keywords : Temperature Vertical flow Fracture Borehole velocity Flowmeter
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Submitted on : Friday, October 28, 2011 - 2:48:09 PM
Last modification on : Tuesday, October 19, 2021 - 10:52:51 PM

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Maria Klepikova, Tanguy Le Borgne, Olivier Bour, Philippe Davy. A methodology for using borehole temperature-depth profiles under ambient, single and cross-borehole pumping conditions to estimate fracture hydraulic properties. Journal of Hydrology, Elsevier, 2011, 407 (1-4), pp.145-152. ⟨10.1016/j.jhydrol.2011.07.018|⟩. ⟨insu-00636856⟩

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