Geometry and Rock Properties Modelling of the Callovo-Oxfordian Claystone from a 3D High Resolution Seismic Cube

In the context of a deep geological repository of high-level radioactive wastes, the French National Radioactive Waste Management Agency (Andra) has conducted, over the past 20 years, an extensive characterization of the Callovo-Oxfordian argillaceous rock in the Eastern Paris Basin. This research has served to demonstrate the feasibility and safety of deep disposal of high-level wastes and intermediate-level long-lived wastes. Today, this research is helping prepare for industrial disposal centre's construction and operation Therefore, the geometry and physical rock properties of the Callovo-Oxfordian claystone formation (COx formation) are required to position the repository, design its shape and numerically simulate its behaviour. This article details the sedimentological background and the results of the geological modelling of the COx formation in the contemplated repository area.