Borehole seismic methods: full wave sonic (FWS) and vertical seismic profiling (VSP) are integral parts of a surface seismic survey. These datasets are used to control and inform the processing and interpretation of the complete 2D / 3D seismic dataset and are also used in the de-risking of a seismic survey. These methods are also useful standalone tools for understanding lithological contacts and other petro physical properties of the formation.
The FWS tool measures in-situ seismic velocities every 10cm. The probe operates in a fluid-filled hole and contains both the source and receiver. The VSP data will determine whether the mineralisation is reflecting the seismic energy and whether the reflections reach the surface. It has a single geophone down the hole and a vibroseis / weight drop source at the surface.