A synthetic Sleipner study of CO2 quantification using Controlled Source Electro-Magnetics and Full Waveform Inversion☆

Abstract A methodology for CO 2 quantification has been developed and tested. Initial investigations were performed as part of a feasibility study of geophysical monitoring at the CO 2 FieldLab site (Svelvik, Norway). Subsequent tests were carried out using a simplified synthetic model representing a CO 2 plume at the Sleipner field (North Sea). The different quantification strategies were based on the use of CSEM inversion, with or without structural constraints based on high-resolution velocity images assumed to be obtained using FWI. The combination of high-resolution structural information (from FWI) and lower resolution conductivity images (from CSEM) clearly improved the accuracy of the quantification methodology.