CO2 Storage Modelling and Capacity Estimation for the Trøndelag Platform, Offshore Norway - using a Basin Modelling Approach

AbstractThere are several approaches to estimate possible storage capacities for aquifers and traps in sedimentary basins, ranging from static theoretical capacities estimates to more detailed methods involving dynamic modelling. In this paper, we used a modified version of the basin modelling software SEMI [1,2] which applies a ray tracing technique to migrate CO2 within a carrier bed below a sealing cap-rock. We present a modelling strategy for a systematic modelling of maximum trap storage capacities and a mapping of possible “safe” injection localities for a storage unit. Two end-member models regarding the influence of faults were tested. The basin modelling results are compared and validated with results obtained from an reservoir simulation software.Simulations were carried out for the Trøndelag Platform, offshore Norway covering an area of ca. 15,000 km2. The slightly north-westwards dipping Middle Jurassic Garn Formation (Fm.) is considered as a good candidate for CO2 storage. It is widely deposited at the Trøndelag Platform, with a thickness around 120 m and shallow buried (