Seal Integrity and Mechanical Stratigraphy of Caprock in KX Field SW Luconia Province

Mechanical rock properties and elastic properties are important when assessing caprocks units for geological carbon storage. There are challenges in determining mechanical properties as they cannot be measured directly from the borehole, and the recovered samples are often limited to some specific depths. This study evaluates the sealing performance of two stratigraphic sealing intervals using log-derived geomechanical and elastic approach to evaluate and build models for CO2 storage site characterization. The area of study is KX Field in Southwest Luconia Province, where the reservoir is of carbonate type. Five wells were utilized in this study, and the logs were used to predict the pore pressure profiles and estimate elastic and strengths of caprock such as the Young’s modulus, UCS, and Poisson’s ratio. The results reveal a significant variation in strength and stiffness between the two seals, with strong harmonization between mechanical properties with the lithological facies and petrophysical properties. Pore pressure increases vertically, and their distribution varies in the two seals. The findings from this study provide insight into how mechanical properties influence caprock performance in the KX Field. It can be used for future geomechanical simulation and fault reactivation studies.