Towards a workflow to evaluate geological layering uncertainty on <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si15.svg" display="inline" id="d1e935"><mml:msub><mml:mrow><mml:mi mathvariant="normal">CO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math> injection simulation

We propose a workflow for updating 3D geological meshed models to test different layering scenarios and assess their impact on the simulation of CO2 injection. This operates tetrahedral mesh that encodes rock unit information as well physical properties. The alternative meshes are built by modifying input inserting new horizon defined scalar field. Modifying consistently model while keeping its quality is challenge we tackle using advanced capabilities MMG, an open source remeshing library. injection then simulated with GEOSX, open-source, multiphysics, multilevel solver. demonstrate this stratigraphic uncertainty assessment simple synthetic layered reservoir flank salt diapir. Comparison results eased since modifications localized area around inserted horizon. consistent highlight role unconformities trap integrity. work opens promising path developing numerical unstructured combining coupled flow-geomechanical in domains affected structural uncertainties.