High precision acoustic logging processing for compressional and shear slowness
AssigneeHalliburton Energy Services, Inc.
InventorsRuijia Wang, Chung Chang, Kristoffer Thomas Walker, Baichun Sun
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Abstract
Disclosed are systems and methods for high precision acoustic logging processing for compressional and shear slowness. The method comprises measuring, by a sonic logging tool, sonic data associated with a formation within a borehole, attempting a detection of a first arrival within the sonic data determining whether the attempted detection of the first arrival is accurate, and in response to an accurate detection of the first arrival determining a travel time of the first arrival, generating a coherence map including the first arrival, and determining, based on the coherence map, a characteristic of the formation.
Claims20
A method, comprising:
- measuring, by a sonic logging tool, sonic data associated with a first formation within a borehole;
- attempting to locate a first arrival of a P-wave within the sonic data;
- in response to not locating the first arrival of the P-wave, determining an arrival time of the P-wave in the first formation by integrating a slowness over a travel distance through the first formation between a transmitter and a receiver within the sonic logging tool;
- applying a borehole compensation based on the integrated slowness to determine a final computed travel time of the first arrival of the P-wave in the formation;
- generating a coherence map based on the final computed travel time;
- tracking one or more peaks along a travel time axis of the coherence map;
- and
- determining, based on the one or more peaks, a characteristic of the first formation.
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 associated with a first formation within a borehole;
- attempt to locate a first arrival of a P-wave within the sonic data;
- in response to not locating the first arrival of the P-wave, determine an arrival time of the P-wave in the first formation by integrating a slowness over a travel distance through the first formation between a transmitter and a receiver within the sonic logging tool;
- apply a borehole compensation based on the integrated slowness to determine a final computed travel time of the first arrival of the P-wave in the formation;
- generate a coherence map based on the final computed travel time;
- tracking one or more peaks along a travel time axis of the coherence map;
- and
- determine, based on the one or more peaks, a characteristic of the first formation.
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 associated with a first formation within a borehole;
- attempt to locate a first arrival of a P-wave within the sonic data;
- in response to not locating the first arrival of the P-wave, determine an arrival time of the P-wave in the first formation by integrating a slowness over a travel distance through the first formation between a transmitter and a receiver within the sonic logging tool;
- apply a borehole compensation based on the integrated slowness to determine a final computed travel time of the first arrival of the P-wave in the formation;
- generate a coherence map based on the final computed travel time;
- track one or more peaks along a travel time axis of the coherence map;
- and
- determine, based on the one or more peaks, a characteristic of the first formation.
Dependencies are inferred from the claim text.