Automated methods to determine properties of laminated reservoir formations
AssigneeSchlumberger Technology Corporation
InventorsNicholas Norman Bennett, Ting Lei, Erik Wielemaker, Lin Liang, Romain Prioul, John Adam Donald, Olga Podgornova
Life of this patent
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Abstract
Aspects provide for methods that successfully evaluates multiple compressional and shear arrival events received by a sonic logging tool to evaluate the presence of structures, such as shoulder beds, in downhole environments. In particular, the methods described herein enable automated determination of properties of laminated reservoir formations by, for example, enabling the automated determination of arrival times and slownesses of multiple compressional and shear arrival events received by a sonic logging tool.
Claims20
A method to perform an automated time pick for determination of properties of a laminated reservoir formation, comprising:
- obtaining data related to a slowness log for at least one geological feature;
- obtaining at least one waveform recorded by an acoustic logging tool;
- performing a slowness time coherence analysis of the data related to the slowness log for the at least one geological feature and the at least one waveform;
- and
- performing an analysis to determine at least one of an arrival time and apparent slownesses of a plurality of compressional and shear arrival events, wherein performing the analysis comprises extracting a square curve that tracks peak contours of the slowness time coherence analysis to determine the at least one of the arrival time and apparent slowness of the plurality of compressional and shear arrival events.
A method to perform an automated time pick for determination of properties of a laminated reservoir formation, comprising:
- obtaining data related to a slowness log for at least one geological feature;
- obtaining at least one waveform recorded by an acoustic logging tool;
- performing a slowness time coherence analysis of the data related to the slowness log for the at least one geological feature and the at least one waveform, wherein performing the slowness time coherence analysis of the data related to the slowness log for the at least one geological feature and the at least one waveform uses a coherent energy estimator;
- and
- performing an analysis to determine at least one of an arrival time and apparent slownesses of a plurality of compressional and shear arrival events.
A method to perform an automated time pick for determination of properties of a laminated reservoir formation, comprising:
- obtaining data related to a slowness log for at least one geological feature;
- obtaining at least one waveform recorded by an acoustic logging tool;
- performing a slowness time coherence analysis of the data related to the slowness log for the at least one geological feature and the at least one waveform;
- and
- performing an analysis to determine at least one of an arrival time and apparent slownesses of a plurality of compressional and shear arrival events, wherein performing the analysis is performed by establishing a minimum separation distance between peak locations.
Dependencies are inferred from the claim text.