Characterization of Upper Jurassic Organic-Rich Caprock Shales in the Norwegian Continental Shelf

Characterizing the top seal integrity of organic-rich caprock shale is critical in hydrocarbon exploration and fluid storage sites assessment because acts as a barrier to low-density upward migrating fluids. This study investigated geomechanical properties Upper Jurassic shales various basins from Norwegian Continental Shelf. Usually, paleo-deposition diagenesis vary basin basin, which influences shale; hence, integrity. Fourteen (14) wells four (4) different within Shelf were analyzed evaluate effects processes acting on properties. Comparative mineralogy-based also investigated. We include thorough review distribution organic inorganic components utilizing SEM 3D microtomography they relate development propagation microfractures. Five (5) three (3) contain measured shear sonic logs. These used for petrophysics rock physics analysis. Three elastic properties-based brittleness indices estimated compared. The percentage mineral fractions studied varied significantly between basins, reflected mineralogical evaluation. Irrespective relative changes have been observed. Young’s Modulus–Poisson’s ratio-based empirical equation underestimated compared with mineralogy- acoustic estimation. A better match has observed indices. However, both methods limitations, an integrated approach recommended Brittleness are qualitative seal; further investigation required quantify sealing