Model-based corrections to acoustic property values of annular material to mitigate ideal artifacts

One or more non-transitory machine-readable media comprising program code, the program code to:

• obtain acoustic measurements for a first depth in a cased borehole;
• generate feature vectors for azimuths represented in the acoustic measurements, wherein each feature vector comprises features of a respective azimuth based, at least in part, on casing inspection property features based on the acoustic measurements, fluid acoustic property feature based on the acoustic measurements, a tool based feature, and acoustic wave features;
• run a trained model for each of the feature vectors to obtain corrections for computed values of an acoustic property of an annular material of the cased borehole, wherein the computed values include artifacts of one or more assumptions incorporated into a mathematical model used to compute the values;
• and
• apply the corrections to the computed values to obtain corrected values of the acoustic property of the annular material.

An apparatus comprising:

• a processor;
• and
• a machine-readable medium having program code executable by the processor to cause the apparatus to,
• obtain acoustic measurements for a first depth in a cased borehole;
• generate feature vectors for azimuths represented in the acoustic measurements, wherein each feature vector comprises features of a respective azimuth based, at least in part, on casing inspection property features based on the acoustic measurements, fluid acoustic property feature based on the acoustic measurements, a tool based feature, and acoustic wave features;
• run a trained model for each of the feature vectors to obtain corrections for computed values of an acoustic property of an annular material of the cased borehole, wherein the computed values include artifacts of one or more assumptions incorporated into a mathematical model used to compute the values;
• and
• apply the corrections to the computed values to obtain corrected values of the acoustic property of the annular material.