Interval Q estimation and a quality indicator -- QQI

Chuandong (Richard) Xu and Robert R. Stewart

ABSTRACT

We use the spectral ratio method with zero-offset VSP data to develop a new approach to calculate the continuous interval QP value in Ross Lake area. A Q estimation Quality Indicator (QQI) for getting a stable Q has been established. This QQI curve also explains why sometimes we cannot get good results. Due to the much narrower frequency bandwidth of S-wave, Q S estimation is not as good as Q P .

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