Читать книгу Geophysical Monitoring for Geologic Carbon Storage - Группа авторов - Страница 70

A series of laboratory supercritical carbon dioxide (scCO₂) injection experiments (pore water drainage experiments) on small sandstone cores investigating the effects of a single discrete fracture is presented. The orientation and aperture of the fracture are varied across the series of tests. The dynamic Young's modulus and shear modulus along the axis of cylindrical core samples and their related attenuation are determined within a sonic frequency band of ~1 kHz to ~2 kHz, using a resonant bar technique. Concurrently, the distribution of scCO₂ injected into the cores is examined using X‐ray CT. The orientation of the fracture with respect to the scCO₂ migration and the wave propagation direction is shown to have a large impact on how the seismic wave velocities (or moduli) and attenuations change as a function of scCO₂ saturation of porous, fractured rock.