Teréga's natural gas storage at Lussagnet and Izaute is located roughly 500 m below ground, in an aquifer (water-impregnated porous rock stratum), known as a "reservoir", overlaid by impermeable rock strata, known as the "overburden".
Teréga continuously monitors the effects of its underground gas storage operations
In particular, the company monitors:
- the pressure in the reservoir (in the area occupied by the gas) and the overlying strata:
- the pressure in the aquifer (around the area where the gas is present);
- the water and gas quality.
Full understanding of the implications of these readings is gained from monitoring, assessment (particularly in partnership with the geological and mining research bureau, BRGM), modelling and research (in particular with the University of Pau and the Pays de l’Adour, UPPA).