130 Well seismic surveying and acoustic logging Figure 5.9 is a synthesis of the methods developed to detect karstic bodies and to quantify flows. It gathers data from acoustic logging, ambient seismic noise, VSP data, OPTV and PLT flow metering. Figure 5.9 Flow detection at well M20. Top: Full waveform acoustic data (left) and VSP data (right). Bottom: comparison between OPTV, Noise/signal detector (acoustic data), VSP flow index and PLT log.
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