Multi-Scale Characterization of an Heterogeneous Aquifer Through the Integration of Geological, Geophysical and Flow Data: a Case Study

Abstract : This paper presents the integrated modelling study of an experimental hydrogeological site recently developed near Poitiers city. The objective assigned to this site is the design of reliable methodologies to simulate flow and transport in highly-heterogeneous reservoirs. Around 30 wells have been drilled on this low-depth captive aquifer, according to a square and centred pattern, with an average well spacing of 70 meters. All the observations and measurements acquired on this Site lead to a characterization of the spatial distribution of the aquifer heterogeneities, and to the recognition of their probable origin. Firstly, pumping tests and production logs revealed the heterogeneous flow behaviour at the Site scale. A static characterization of the reservoir was then undertaken from geophysical surveys and especially from the joint geological analysis of cores and logs, while taking into account flow measurements. Most information were found to be consistent with a paleo-karstic origin of this aquifer, an assumption that was recently corroborated by wellbore images. The first step of this project ends up with the construction of a geostatistical model that illustrates the spatial organization of the main drains and their link with the background facies. This model, once enriched by recent data, will constitute the support model for simulating and interpreting the pumping and interference tests. This second step, i.e. the dynamic simulation of the Site, will be indispensable to constrain the location and size of the drains that ensure the productivity of each well and their hydraulic connections.
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B. Bourbiaux, Jean-Paul Callot, B. Doligez, M. Fleury, F. Gaumet, et al.. Multi-Scale Characterization of an Heterogeneous Aquifer Through the Integration of Geological, Geophysical and Flow Data: a Case Study. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2007, 62 (3), pp.347-373. ⟨10.2516/ogst:2007029⟩. ⟨hal-02005657⟩

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