The key measurement is the p-wave velocity
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The equivalent measurement is travel time:
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Table 1. Typical values of wave velocities.
Media | P-wave velocity | S-wave velocity | |||||||
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| Rocks | 4,500 | 2,300 | |||||||
| Casing | 5,850 | 7,800 | |||||||
| Weight cement | 4,000 | 2,400 | |||||||
| Conventional cement | 2,800 | 1,900 | |||||||
| Low-density cement | 1,950 | 1,200 | |||||||
| Ultra-low-density cement | 1,600 | 1,100 | |||||||
| Water | 1,500 | 1,000 |
References
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Dvorkin, TIME-AVERAGE EQUATION REVISITED, 2001.pdf Dr. Paul Glover, Petrophysics MSc Course Notes, Sonic Log, Chapter 16.PDF |