| 摘要 |
<p>A method of determining the sonic slowness of an underground formation from sonic measurements, includes the steps of: (i) obtaining sonic waveforms in the underground formation; (ii) determining, from the sonic waveforms, multiple values of at least one parameter related to the sonic slowness of the formation together with an estimate of the error in each value; and (iii) using the estimate of the error in each value to select a parameter value related to slowness as representative of the formation. The sonic waveforms are typically obtained by logging an interval of a borehole which runs through the formation with a tool which output sonic waveform measurements. The tool can be run on wireline or coiled tubing or the like, or alternatively can be a logging while drilling tool located in a drill string being used to drill the borehole.</p> |
