Go to:

  next
  story

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.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 1. The VSP tool shown above consists of 12 individual sondes linked by an electronic cable and terminated with a logging cable head. The distance between each sonde can be 10, 15 or 20 m. Each sonde contains three orthogonal geophones (two horizontal and one vertical) and a single hydrophone. A hydraulically powered locking arm (shown retracted) ensures that the geophone package is secured against the borehole wall (Courtesy of CGG).