Acoustic signal processing using model-based adaptive filtering
AssigneeHalliburton Energy Services, Inc.
InventorBatakrishna Mandal
Life of this patent
Estimating the term…
Abstract
A method of processing acoustic waveform data is disclosed. An acoustic logging tool acquires acoustic waveform data. An adaptive frequency filter is determined. The acoustic waveform data is filtered using the adaptive frequency filter. A formation slowness is determined from the filtered acoustic waveform data. The lower bound of the adaptive frequency filter may be determined using a polynomial function of a minimum excitement frequency parameter, a slowness parameter, and a third parameter. The upper bound of the adaptive frequency filter may be determined using a polynomial function of a peak excitement frequency parameter, the slowness parameter, and the third parameter.
Claims20
A method of processing acoustic waveform data comprising:
- acquiring acoustic waveform data from an acoustic logging tool;
- determining an adaptive frequency filter;
- filtering the acoustic waveform data using the adaptive frequency filter;
- and
- determining a formation slowness from the filtered acoustic waveform data.
A method of processing acoustic waveform data comprising:
- acquiring acoustic waveform data from a log file;
- determining an adaptive frequency filter;
- filtering the acoustic waveform data using the adaptive frequency filter;
- and
- determining a formation slowness from the filtered acoustic waveform data.
A method of processing acoustic waveform data comprising:
- acquiring acoustic waveform data from an acoustic logging tool;
- determining an adaptive frequency filter;
- filtering the acoustic waveform data using the adaptive frequency filter;
- determining a formation slowness from the filtered acoustic waveform data;
- selecting a frequency band for exciting a formation based in part upon the adaptive frequency filter;
- and
- exciting the formation using a wavelet within the selected frequency band by an acoustic source of the acoustic logging tool.
Dependencies are inferred from the claim text.