126 Well seismic surveying and acoustic logging conversion of P-waves into Stoneley waves. Figure 5.5 (top left) shows the ambient noise and its associated ambient noise factor. The attribute, named VSP flow index, defined as the product of the ambient noise factor by the body wave to Stoneley wave conversion factor (Figure 5.5, bottom right) was used to detect both karstic bodies and flow. Figure 5.6 Flow detection using both ambient noise measurement and VSP data at well M13. Top left: Ambient noise and ambient noise factor. Top right: VSP data showing a high level of Stoneley waves. Bottom left: Up-going Stoneley waves and P-wave to Stoneley wave conversion factor. Bottom right: Detection of flow at 87 m deep and comparison of VSP flow with PLT flow.
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