Description of the site
The experimental test site consists of two adjacent wells Pz1 and Pz2, which have been drilled to a depth of 50 m in a porous/fractured chalk system. The two wells are located around 5.5 km WNW from Mons city in South-West Belgium. They are 7.55 m distant and are mainly hydraulically connected by sub-horizontal fractures. The uppermost 12 m-section of the two wells are lined with a metallic casing, while the rest meters are unlined, allowing experiments with inflatable double packer systems (Goderniaux et al., 2018; Hoffmann et al., 2020).
The investigated chalk aquifer (Cretaceous) is part of the Mons Basin geological entity. In the around the two wells, the aquifer is considered as unconfined. The porous matrix of the chalk has a high estimated total porosity while the porosity related to the fractures is estimated to be of a few percentages only. The aquifer under investigation can be considered as a typical dual porosity, dual permeability reservoir. A global equivalent hydraulic conductivity was estimated to be 5.18×10-5 m s-1 based on pumping test data, over the whole well section (Goderniaux et al., 2018).
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References
- P. Goderniaux, A. Beyek, A. Tchotchom, A. Poulian, M.-L Wattier, and S. Vandycke. Study of the heterogeneity of hydraulic properties in a chalk aquifer unit, using sequential pumping and tracing experiments with packer systems, In Engineering in Chalk, pages 675–680. Imperial College, London, 2018. [ DOI ]
- R. Hoffmann, P. Goderniaux, P. Jamin, E. Chatton, J. de la Bernardie, T. Labasque, T. Le Borgne, and A. Dassargues. Continuous dissolved gas tracing of fracture-matrix exchanges. Geophysical Research Letters, 47(17):e2020GL088944, 2020. [ DOI ]
Data availability
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