Patent ID: 6453240
Filing Date: 2002-09-17
Classification: G01V

Abstract:
A method to measure formation properties, comprising:(a) generating a first acoustic signal at a first depth in a borehole; (b) receiving said first acoustic signal at a first set of acoustic receivers proximate said first depth to generate a first series of received acoustic waveforms; (c) calculating from said first series of received acoustic waves a probability density function of slowness and time for said first acoustic signal; (d) generating a second acoustic signal at said first depth in said borehole; (e) receiving said second acoustic signal at a second set of acoustic receivers proximate said first depth to generate a second series of received acoustic waveforms, wherein said second set of acoustic receivers may be different from or the same as said first set of acoustic receivers; (f) calculating from said second series of received acoustic waves a probability density function of slowness and time for said second acoustic signal; (g) combining said probability density functions of at least said first and second series of acoustic waves to derive a most probably measured value formation characteristic for formation near said borehole at said first depth.