AN IMPROVED STONELEY WAVE SLOWNESS AND DISPERSION CURVE LOGGING METHOD

摘要

A method to measure borehole Stoneley wave slowness and its associated tool-corrected dispersion curve. The method for measuring borehole Stoneley wave slowness may comprise gathering waveforms, conditioning waveforms, identifying slowness constraints, computing a time-slowness mask, computing a coherence map from differential phase time semblance, processing a two-dimensional time-slowness map, determining slownesses from a one-dimensional variable density log, and tracking time pick from a two-dimensional map. The method may further comprise identifying one or more of coherence, power, instantaneous frequency, signal-to-noise ratio, or error bars from the two-dimensional time-slowness map. The method may further computing a spline interpolation locally around the pick from the one-dimensional variable density log to produce a final data product.