Presentation: The double porosity of the chalk and its influence on solute and heat transport

Event: 6th International Geologica Belgica Meeting 2018
Presentation by Richard Hoffmann, Pascal Goderniaux, Pierre Jamin, Alain Dassargues


Fractured rock aquifers like the Belgium chalk can act as important drinking water suppliers and for protection an advanced imaging of double porosity effects is important for transport predictions with reduced uncertainty. Between two adjacent 50 m-deep 7.55 m distant boreholes a with flowmeter tests and optical imagining figured out open main fracture is for multiple tracer tests isolated using an inflatable double packer system. Injecting in a dipole configuration continuously 50 °C hot water for 70 h jointly with two pulse fluorescent dye tracer (uranine) shows a 12.5 hours arrival delay of the heat compared to the solute. Stopping heat injection shows a strong direct temperature decrease followed by slow temperature rebound over several days. Stored heat around the injection well is pulled and the matrix reacts slowly by contribute stored heat to the colder water drawn from the surroundings.


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