This proposal is directly in response to the thematic area "New knowledge that facilitates large-scale CO2 storage in the North Sea". The overall objectives are also targeted towards addressing some important topics under the themes of i) increasing knowledge about storage capacity, injectivity and the long-term effects of stored CO2, ii) gaining a better understanding of the mechanism that prevent leakage of CO2, and iii) increasing knowledge of how pressure build in a CO2 storage can be handled. The seal rock integrity and the overburden rocks will be analysed for proposed CO2 storage sites Smeaheia (east of the Troll Field) in the North Sea in order to identify critically stressed faults to predict slip on potential active faults as a function of pore pressure change or buildup, evaluate risk for fracturing, and risk of vertical and lateral CO2 migration. The project will be carried out as a collaborative effort between the University of Oslo, Norwegian Geotechnical Institute, Norwegian Computing Center, Colorado School of Mines and Curtin University with Statoil & TOTAL. OASIS will generate site specific seismic data derived 3D geomechanical models focusing on the overburden and seal rocks for the potential CO2 storage reservoirs. All the other necessary information (e.g. available cores, cuttings, wireline logs, laboratory test data, and pressure data from the wells) can be subsequently used to calibrate and iterate the models. In addition to the innovative procedure for the integrated computational 3D geomechanical modeling of the CO2 storage seal and overburden, caprock leakage potential, and the overburden pore pressure and pore fluid distributions from seismic inversion, the project will produce much needed high-quality hydro-mechanical data on overburden and cap rocks from advanced laboratory testing. This makes the project directly applicable and of benefit to existing and future large-scale CO2 storage projects in the Norwegian Continental Shelf (NCS).
Project leader: Nazmul Haque Mondol
Institution: Institutt for geofag