Resolving Structural Uncertainty using DAS VSP Survey in Central Australia

Summary

Borehole seismic technology provides an efficient way to image the subsurface in high-resolution, through 3D, Walkaway or Offset VSPs. Whilst acquisition time of the conventional VSP survey is less than surface seismic, such VSP surveys can take hours or even days to acquire. With the proliferation of the fibre-optic, Distributed Acoustic Sensing technology, the acquisition time can be slashed to just a few minutes.

The Bauer field in central South Australia is the site of the major borehole seismic survey, comprising Walkaway and Offset VSPs in multiple wells, aimed at reducing structural uncertainty. The Offset VSP data presented in this paper were acquired using Schlumberger’s hDVS service. The processing results show that even at large offsets, DAS technology can be successfully applied to image the subsurface.

• Offset VSP
• DAS
• hDVS
• Imaging