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The Geophysical Corner is a regular column in the EXPLORER, produced cooperatively by the AAPG Geophysical Integration and SEG Interpretation committees, and edited by M. Ray Thomasson. This month's column is titled "VSP -- The Link Between Geology and Geophysics."

VSP Links Geology, Geophysics

By RONALD C. HINDS and RICHARD KUZMISKI

Editor's note: Hinds is a senior geophysicist for PanCanadian Resources, Calgary, Canada; Kuzmiski is responsible for VSP and acoustic log processing at Computalog, Calgary.

Click on the figure below to view greater detail.

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Figure 2. Example geometries of surface source and sondes (containing the geophone package). A survey should be planned with the travelpath of the seismic energy in mind. A far-offset VSP field setup such as a source at S2 and receiver at A would image the interface at the borehole if the position A was at the interface and up to half the offset distance along the interface if the geophone position A was at the surface (from Hinds et al., 1996).