Amplified Geochemical Imaging AGI to Monitor CO2 At Krechba Field-Algeria

In order to minimize the greenhouse gas emissions (GHG) over the world, the process of CO2 capture and storage started in Salah Gas project (ISG). Here, the CO2 is sequestered in an onshore saline aquifer as a long-term process and storage to eliminate vent to atmosphere and ensure a safe storage for hundreds of years. This paper describes the amplified geochemical imaging AGI technique as a new technology among others for CO2 monitoring presented in the 79th EAGE Paris Conference and Exhibition in 2017. The AGI technique aims to monitor the tracer gases injected in 2007 at Krechba field to detect possible CO2 leakage to the surface. To garantee the underground sequestration, the Amplified geochemical imaging AGI survey was used for the first time as a surface geochemical imaging to detect and quantify organic compounds from C1 to C20 (pythane). The AGI is a new technique based on the chemical analysis and sophisticated statistical geochemical methods to differentiate between the accumulated reservoir hydrocarbons originated from the mother source or migrated oil. The main objective of the present study is to present in details the AGI technique from the implementation and design to the inetrpretaion of the sample signatures.