Compressional- and shear-wave studies of distributed acoustic sensing acquired vertical seismic profile data

• DOI: 10.1190/tle36120987.1
• Publication Date: 2017-11-28T17:46:06Z
• Authors: Xiang Wu; Mark E. Willis; William Palacios; Andreas Ellmauthaler; Oscar Barrios; Simon Shaw; Dan Quinn
• Keywords: Slowness; Geophone; Vertical seismic profile; Microseism; Shear waves

Understanding the strengths and limitations of rapidly advancing distributed acoustic sensing (DAS) technology used for recording vertical seismic profile (VSP) data is achieved by comparing DAS geophone sets using both compressional-wave (P-wave) shear-wave (S-wave) VSP their corresponding geophysical answer products. We validate kinematics (time) dynamics (amplitude) examining extracted slowness values, response-to-incident angles, corridor stacks, common-depth-point (CDP) transforms. For validation, values computed from P- S-wave components agree with values. we confirm cos 2 θ response fiber to incident angle wavefield P-waves sin 2θ S-waves. The amplitudes P-wave stacks are comparable; similar shallow events differ later due limited S-waves at near-vertical angles incidence. High-quality CDP transform images obtained These analyses indicate that properly acquired reliable kinetics Once fiber-optic cable installed in well, acquisition costs greatly reduced because may be no additional well intervention. extensive spatial coverage cables, ease acquiring time-lapse (4D) data, reliability resulting making an extremely important tool.