A Complete Model Rebuilt for a Brown Field by Maturing Channel Depo-Environment for CO2 Storage Characterization and Containment Analysis

Fluvial deposits are considered as potential for CO2 storage sites; however, it usually presents heterogeneous fluvial architectures which are resulting in both significant and poor storage efficiency. Moreover, the injectivity of CO2 depends on heterogeneity scales and obviously flow barriers strongly impact migration of the CO2 plume. In this paper, a highly depleted gas field, clastic with multiple stacked sands is described as a CO2 storage site ( Figure 1 ). Constraint on seismic quality due to large shallow gas cloud is always the main challenge for reservoir characterization and modelling of the field, even though it is almost the end of field life. Therefore, the key uncertainty of this field is related to the distribution of the fluvial facies, which has a significant impact on containment and storage analysis.

The paper is aimed to present a complete rebuild full model from seabed, including shallow overburden, under burden and depleted reservoirs in a brown field from old reservoir model built in 2005, by maturing its sedimentology model and integrating all geoscience and dynamic data. The model then is history matched and used for injection forecast, thermal simulation and coupled with 3D geomechanical model for CO2 containment integrity study.