Semblance processing for an acoustic measurement-while-drilling

Details Semblance processing for an acoustic measurement-while-drilling Semblance processing for an acoustic measurement-while-drilling

1998-07-08

2000-02-08

Oda, Christine

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 76, 175 45, G01V 140

Patent

active

060234431

ABSTRACT:
The present invention provides a system for drilling boreholes having a downhole subassembly which contains an acoustic measurement-while-drilling system. It uses the acoustic velocity through the formations surrounding the borehole and an acoustic transmitter and a set of receivers for determining the bed boundaries surrounding the borehole formation. Semblance of the data is determined in a slowness/intercept-time domain. Coherence and semblance filtering methods are used to differentiate between reflection signals and noise. The position and orientation of the bed boundary relative to the tool are determined. A further processing step uses the relative position and orientation determined for a number of tool positions to further discriminate against noise and obtain an absolute position and depth of the bed boundaries.

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