Elucidating Downhole Gas Compositional and Isotopic Variation through 3D Basin-scale CO2 Model

This paper describes a 3D basin modelling study conducted offshore Sarawak Basin, aiming at predicting basin-wide CO2 distribution. Two set of models were constructed: regional basin-scale and block-scale. The regional basin-scale model was able to explain the CO2 concentration and carbon isotopic changes observed in Well-X. The block-scale model, however, failed to replicate the observed CO2 variations. This study underscores the importance of having regional basin-scale models.