Characterization of diabase core anisotropy: Integrating ultrasonic measurements and digital rock physics

Abstract

As intricate compositions of diverse materials, hard rock possesses complex mechanical and elastic properties influenced by various factors. In this study, a diabase core was drilled, characterized, measured, and analyzed to investigate the elastic properties of rocks. The research aims to evaluate these properties using dynamic and static methods, employing ultrasonic measurements and digital rock physics. The sample underwent mineralogical analysis through thin sections. Comparatively, micro-CT scanning was employed to explore potential layering and fractures that might impact the anisotropy of acoustic wave propagation, as observed in digital images. The digital image reveals the presence of high-density minerals, particularly Clinopyroxene, extending along the z-axis. The static and dynamic elastic moduli suggest that the sample exhibits isotropic characteristics. However, variations in anisotropy coefficient values for V_p and V_s are noted, likely stemming from high-density sheet-like minerals. While both static and dynamic methods produce elastic moduli and velocities within the typical range for diabase rock, notable differences are apparent, possibly due to disparities in the physical techniques utilized.