CO2 sequestration monitoring and verification technologies applied at Krechba, Algeria

The CO2 sequestration monitoring and verification technologies applied at Krechba, Algeria has been reported. CO2 is being injected into the aquifer leg of the gas producing Krechba Field in central Algeria for longterm storage as a greenhouse-gas reduction initiative as part of the overall In Salah Gas (ISG) development project. The CO2 is injected into the aquifer leg of a 20-m thick, fractured Carboniferous sandstone reservoir from which the Krechba Field produces CO2-rich gas. A preinjection risk register was prepared as part of the initial assessment of the injection site, which was used to design the original monitoring program. The suite of technologies to be deployed at any CO2 storage site for monitoring and verification purposes is readily available and uses mainly standard oil field techniques and practices.