SEGJ Technical Conference

Overview and technical problems on PS logging (Part 5): Utilization of seismic cone for high-precision S-wave VSP and correlation with high-resolution S-wave seismic reflection profile.

Abstract Direct-push type seismic cone can provide high-precision VSP data of the near surfaces because the cone is self-coupled with surrounding layer during penetration and its orientation is easy to be directed. Naturally, we can extract upgoing waves and reconstruct 1D seismic profiles. The authors conducted seismic cone penetration testing (SCPT) in 1999 at a site where a concealed active fault had been interpreted. It took only 40 minutes to obtain 30-depth bi-directional horizontal hitting data at 50 cm intervals. High-resolution S-wave seismic reflection survey was also carried out at the site. Seismic correlation of them were quite useful to interpret near surface deformation structure around a concealed fault at the site.