Numerical investigation of fracture channel waves

Weidong Yi, Seiji Nakagawa, Kurt T. Nihei, James W. Rector, Larry R. Myer, Neville G. W. Cook
1998 SEG Technical Program Expanded Abstracts 1998   unpublished
This paper examines the characteristics of channel wave propagation in a waveguide formed by two parallel fractures using two-dimensional elastic finite difference simulation and mode analysis. Velocity dispersion of the fracture channel waves computed from f-k analysis of the synthetic waveforms shows good agreement with the mode solution. The dispersion characteristics of the fracture channel waves are compared to those for classic Rayleigh channel waves in a low velocity layer with
more » ... selected so that the S-wave acoustic impedance of the layer matches that of the fracture waveguide at the central frequency of the source. Significantly different velocity-frequency behavior for the various modes was observed for the two types of waveguides. In addition, the fracture waveguide shows high-frequency thickness resonances in the vicinity of the source.
doi:10.1190/1.1820232 fatcat:esgokxjblzee5eybeg3evvnz6q