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More information about formation properties than is commonly utilized is available in the acoustic signal. The objective of full-wave acoustic logging is to use more of this information to determine formation properties.
Full-wave acoustic tools generally have transmitter-to-receiver spacings greater than about eight feet. This provides deeper penetration and facilitates signal analysis. Full-wave acoustic signals are briefly discussed.
Shear wave slowness, or Δts, is one of the most important new acoustic logging measurements. Used with Δtp, Δts provides basic log quantities for lithology identification, gas zone identification, estimation of lithology and porosity with acoustic logs only, and improved formation elastic property estimation.
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