Compressional-wave velocity variation in the upper Macaé formation: A well-log regression analysis study

In this contribution, we propose an alternative way to calibrate and estimate S-wave velocities using a regression analysis methodology. Prediction of S-wave velocities is critical in locations where sonic logs only have P-wave velocities available or for some reason only in discrete intervals, generally in slow formations. The proposed method applies two robust quadratic models for estimating S-wave velocities, assuming V p , clay volume and, fractional effective porosity as parameters affecting V s . Considering S-wave velocities varying according to quadratic models, the estimation process confirms previous results showing V p as the most important dependence parameter in the regressions. The preliminary results corroborate the idea that the use of the proposed quadratic model by regression analysis can represent a suitable procedure for predicting shear wave velocities in slow siliciclastic rocks.

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Compressional-wave velocity variation in the upper Macaé formation: A well-log regression analysis study

Cited by 2 publications

References 12 publications

Variation of seismic amplitudes in the upper Macaé formation

Variation of seismic amplitudes in the upper Macaé formation

Shear Wave Velocity Estimation in slow siliciclastic formations using empirical models

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