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

Abstract

A methodology for CO2 quantification has been developed and tested. Initial investigations were performed as part of a feasibility study of geophysical monitoring at the CO2FieldLab site (Svelvik, Norway). Subsequent tests were carried out using a simplified synthetic model representing a CO2 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.