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US 11,112,519 B2Granted
Automatic slowness-frequency range determination for advanced borehole sonic data processing
AssigneeHalliburton Energy Services, Inc.
InventorsRuijia Wang, Chung Chang, John Philip Granville, Baichun Sun
Life of this patent
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Abstract
Disclosed are systems and methods for selecting modes and frequencies of interest in a slowness-frequency map of sonic logging information. These include measuring, by a sonic logging tool, sonic data within a borehole, determining a frequency range for a selected mode of the sonic data, determining a slowness range for the selected mode of the sonic data, applying the frequency range and the slowness range to the sonic data to select a subset of data from the sonic data, processing the selected subset of data.
Claims20
A method comprising:
- measuring, by a sonic logging tool, sonic data within a borehole;
- determining a frequency range for a selected mode of the sonic data, wherein the determining of the frequency range comprises:
- executing a forward model to obtain a dispersion response from the selected mode, the forward model being executed based on a compressional slowness value obtained from the sonic data;
- and
- selecting a minimum frequency and a maximum frequency based on the dispersion response, the dispersion response being based on flexural waves of a type of formation;
- adjusting the maximum frequency of the frequency range to an updated maximum frequency to provide an updated frequency range, the updated maximum frequency being a center frequency of the frequency range;
- determining a slowness range for the selected mode of the sonic data;
- applying the updated frequency range and the slowness range to the sonic data to select an updated subset of data from the sonic data;
- and
- adjusting the dispersion response based on the updated subset of data from the sonic data relating to the updated frequency range.
7 more elements
A system comprising:
- a sonic logging tool having a receiver array configured to receive a plurality of waveforms;
- one or more processors in communication with the sonic logging tool;
- and
- at least one computer-readable storage medium having stored therein instructions which, when executed by the one or more processors, cause the one or more processors to:
- measure, by the sonic logging tool, sonic data within a borehole;
- determine a frequency range for a selected mode of the sonic data, wherein the determination of the frequency range comprises:
- executing a forward model to obtain a dispersion response from the selected mode, the forward model being executed based on a compressional slowness value obtained from the sonic data;
- and
- selecting a minimum frequency and a maximum frequency based on the dispersion response, the dispersion response being based on flexural waves of a type of formation;
- adjust the maximum frequency of the frequency range to an updated maximum frequency to provide an updated frequency range, the updated maximum frequency being a center frequency of the frequency range;
- determine a slowness range for the selected mode of the sonic data;
- apply the updated frequency range and the slowness range to the sonic data to select an updated subset of data from the sonic data;
- and
- adjust the dispersion response based on the updated subset of data from the sonic data relating to the updated frequency range.
11 more elements
A non-transitory computer-readable storage medium comprising:
- instructions stored on the non-transitory computer-readable storage medium, the instructions, when executed by at least one processor, cause the at least one processor to:
- measure, by a sonic logging tool having a receiver array, sonic data within a borehole;
- determine a frequency range for a selected mode of the sonic data, wherein the determination of the frequency range comprises:
- executing a forward model to obtain a dispersion response from the selected mode, the forward model being executed based on a compressional slowness value obtained from the sonic data;
- and
- selecting a minimum frequency and a maximum frequency based on the dispersion response, the dispersion response being based on flexural waves of a type of formation;
- adjust the maximum frequency of the frequency range to an updated maximum frequency to provide an updated frequency range, the updated maximum frequency being a center frequency of the frequency range;
- determine a slowness range for the selected mode of the sonic data;
- apply the updated frequency range and the slowness range to the sonic data to select an updated subset of data from the sonic data;
- and
- adjust the dispersion response based on the updated subset of data from the sonic data relating to the updated frequency range.
8 more elements
Dependencies are inferred from the claim text.