CPC G01V 1/284 (2013.01) [G01V 1/288 (2013.01); G01V 1/303 (2013.01); G01V 1/50 (2013.01)] | 23 Claims |
1. An apparatus comprising:
a mechanical wave source;
a set of mechanical wave sensors placed in a borehole drilled into a formation, wherein the set of mechanical wave sensors provide subsurface wave measurements based on formation waves generated by the mechanical wave source;
a processor; and
a machine-readable medium having program code executable by the processor to cause the apparatus to:
acquire the subsurface wave measurements;
select a first set of tool wave measurements based on a common offset from the mechanical wave source;
generate a set of filtered subsurface wave measurements by filtering the subsurface wave measurements based on the first set of tool wave measurements;
generate a time-domain semblance map based on the set of filtered subsurface wave measurements, wherein the time-domain semblance map comprises an initial set of compression wave peaks;
determine a selected qualified compression wave peak based on a semblance value in the time-domain semblance map;
determine a compression wave slowness based on the selected qualified compression wave peak; and
perform a drilling operation based, at least in part, on the compression wave slowness.
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