Seal Integrity of the Rousse Depleted Gas Field Impacted by CO2 Injection (Lacq Industrial CCS Reference Project France)

Abstract

The depleted Rousse field (Lacq, France) has proven its integrity while holding a gas accumulation at a pressure of 480 bar, and has now been converted to a pilot for CO 2 injection. The objective of the studies presented is to describe the characteristics of the seal, qualify the relevant properties for its integrity, and assess its geomechanical integrity through modelling. A conservative recommendation is made of not exceeding the initial caprock entry pressure for the theroretical maximum CO 2 storage pressure, which will remain much above the expected final effective storage pressure anyway.