SHAGAL (FR7.8)

This shallow experimental site along the Mediterranean shore was developped over the past 15 years by CNRS and the University of Montpellier. It has been used to test a series of new downhole monitoring instrument in the context of gas injection. The geological, petrophysical, geophysical and hydrological properties of the clastic formations penetrated down to 60 m depth have been fully studied, outlining the presence of silt and clay barriers and the presence of a few permeable layers, especially at 8 and 12 m depth.

Over the past ten years, small gas volumes (nitrogen, carbon dioxide) have been injected in shallow and sandy permeable layers to study the response of different surface and downhole hydrogeophysical monitoring strategies. At present, the site is equiped with an injection hole and several monitoring holes including either a set of hydrochemical sampling instruments or downhole electrical flutes. Other holes equiped with PVC tubing are available for time-lapse logging operations or cross-hole experiments.

Not applicable. The site might be used anytime, providing that early booking is organized.

SHAGAL provides is fully described and flexible environnement for shallow testing of new monitoring instruments and strategies.