CPC G01V 1/50 (2013.01) [E21B 47/0025 (2020.05); E21B 47/095 (2020.05); E21B 49/00 (2013.01); G01V 1/001 (2013.01); G01V 1/306 (2013.01); G01V 2210/43 (2013.01); G01V 2210/624 (2013.01); G01V 2210/6244 (2013.01); G01V 2210/6246 (2013.01)] | 12 Claims |
1. A system for estimating a property of a region of interest, comprising:
an acoustic measurement device configured to be disposed in a region of interest in an earth formation, the acoustic measurement device including a transmitter configured to emit an acoustic signal having at least one selected frequency configured to penetrate a surface of a borehole and produce internal diffuse backscatter from earth formation material behind the surface and within the region of interest, and a receiver configured to detect return signals from the region of interest and generate return signal data; and
a processing device configured to receive the return signal data, the processing device configured to: process the return signal data to identify internal diffuse backscatter data indicative of the internal diffuse backscatter by gating a portion of the return signal data occurring after one or more initial pulses in the return signal data associated with surface reflections; calculate a probability distribution function of the gated portion of the return signal data, and estimate an entropy value based on the probability distribution function; and estimate the property of the region of interest based on the estimated entropy value.
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