Near-surface CO2 leak detection monitoring from downhole electrical resistivity at the CO2 Field Laboratory, Svelvik Ridge (Norway)

Nataliya Denchik 1 P. Pezard 1 Denis Neyens 1 Johanna Lofi 1 Frédérick Gal 2 Jean-Francois Girard 2 Arnaud Levannier 3
1 Géosciences Montpellier
2 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
3 Schlumberger
Abstract : The objective of the CO 2 FieldLab project was to demonstrate that adequate monitoring methods can be deployed to document potential leaks of CO 2 from subsurface reservoirs. For this, a shallow injection experiment through permeable sediment was designed and conducted at Svelvik (Norway) in September 2011. The goal was to produce a CO 2 leak in order to assess the relative sensitivity of several geochemical and geophysical CO 2 monitoring tools. A total mass of 1.67tons of CO 2 was injected at a depth of 20m through a 45° inclined well over a 6 day period. Time-lapse induction logging and downhole resistivity monitoring from a permanent dipole–dipole array observatory prove to be very sensitive to the presence of CO 2 in the shallow subsurface after the start of injection. Electrical resistivity response correlates with progressive CO 2 dissolution in groundwater, with resistivity and pH values decreasing due to the increase of bicarbonate and dissolved species. The CO 2 plume is channelled by enhanced permeability layers, with updip migration of the gas plume to the North. Other processes responsible for resistivity changes were fresh/salt water mixing, tidal effects and rainfall.
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https://hal-brgm.archives-ouvertes.fr/hal-01314405
Contributeur : Frédérick Gal <>
Soumis le : mercredi 11 mai 2016 - 13:57:03
Dernière modification le : vendredi 5 avril 2019 - 20:14:53

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  • HAL Id : hal-01314405, version 1

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BRGM | CNRS | UNIV-AG | GM | AGROPOLIS | INSU | B3ESTE | UNIV-MONTPELLIER

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Nataliya Denchik, P. Pezard, Denis Neyens, Johanna Lofi, Frédérick Gal, et al.. Near-surface CO2 leak detection monitoring from downhole electrical resistivity at the CO2 Field Laboratory, Svelvik Ridge (Norway). International Journal of Greenhouse Gas Control, Elsevier, 2014, 28, pp.275-282. ⟨hal-01314405⟩

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