Geochemical monitoring at the CO2CRC Otway Project: Tracer injection and reservoir fluid acquisition

Abstract

The Otway Project in Victoria, Australia, run by the Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC) began injecting gas (80% CO 2 : 20% CH 4 ) in a supercritical state in April, 2008. It has been labeled with tracers (SF 6 , Kr and CD 4 ) added via a purpose built slip-stream injector to unequivocally allow verification of the presence of the injected CO 2 at various monitoring sites. A bottom-hole assembly installed in the Naylor-1 monitoring well enables multi-level sampling of fluids at reservoir pressure to allow the determination of hydrological and geochemical processes that control plume movement and water-rock- CO 2 interactions in the subsurface.