Progresses on velocity dispersion and wave attenuation measurements at seismic frequency

摘要

A low frequency measurement system has been designed and built at UH rock physics lab. From measured Young's modulus, Poisson ratio, and phase difference, the velocities and attenuation in rock samples can be obtained. Tests'with the system demonstrate it can successfully detect the fluid flow related velocity dispersion and wave attenuation. The random error and system error are evaluated to be within reasonable level. Limited by the strain gage techniques, the absolute values on modulus or velocity obtained from the current system may not be very accurate, in soft rock samples like heavy oil sand. But the attenuation and relative dispersion trend are still trustable.