Shear wave attenuation measurements from converted-wave VSP data

Michelle C. Montano, Don C. Lawton, and Gary F. Margrave

ABSTRACT

Q S values were estimated from converted-wave VSP data using the spectral-matching method. These values were computed from a walk-away VSP. Then, we conveyed these results into a single value at zero-offset by using the QVO method. For this study, Q S values determined range from 20 to 50, suggesting a strong attenuation for the shear waves. Moreover, we were able to compare Q S /Q P ratios versus V P /V S ratios to understand the rock properties of the study area.

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