Simultaneous Source Encoding and Source Separation As A Practical Solution For Full Wavefield Inversion
First Claim
1. A computer-implemented method for simultaneous inversion of measured geophysical data from multiple encoded sources to determine a physical properties model for a subsurface region, the measured geophysical data resulting from a survey for which the fixed-receiver assumption of simultaneous encoded-source inversion may not be valid, said method comprising using a computer to perform simultaneous-source separation to lessen any effect of the measured geophysical data'"'"'s not satisfying the fixed-receiver assumption, wherein a data processing step coming after a simultaneous source separation acts to conform model-simulated data to the measured geophysical data for source and receiver combinations that are missing in the measured geophysical data.
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Abstract
Method for simultaneous full-wavefield inversion of gathers of source (or receiver) encoded geophysical data to determine a physical properties model (118) for a subsurface region, especially suitable for surveys where fixed receiver geometry conditions were not satisfied in the data acquisition. Simultaneous source separation (104) is performed to lessen any effect of the measured geophysical data'"'"'s not satisfying the fixed-receiver assumption. A data processing step (106) coming after the simultaneous source separation acts to conform model-simulated data (105) to the measured geophysical data (108) for source and receiver combinations that are missing in the measured geophysical data.
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Citations
23 Claims
- 1. A computer-implemented method for simultaneous inversion of measured geophysical data from multiple encoded sources to determine a physical properties model for a subsurface region, the measured geophysical data resulting from a survey for which the fixed-receiver assumption of simultaneous encoded-source inversion may not be valid, said method comprising using a computer to perform simultaneous-source separation to lessen any effect of the measured geophysical data'"'"'s not satisfying the fixed-receiver assumption, wherein a data processing step coming after a simultaneous source separation acts to conform model-simulated data to the measured geophysical data for source and receiver combinations that are missing in the measured geophysical data.
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20. A computer program product, comprising a non-transitory computer usable medium having a computer readable program code embodied therein, said computer readable program code adapted to be executed to implement a method for full-wavefield inversion of measured geophysical data to determine a physical properties model for a subsurface region, said method comprising:
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constructing or inputting an initial physical properties model and using it to simulate synthetic data corresponding to the measured geophysical data, wherein sources and/or receivers in the simulation are encoded and simulated simultaneously, thereby generating simulated encoded data; separating the simulated encoded data according to source, resulting in simulated sequential-source data; computing differences, called data residuals, between the simulated sequential source data and the corresponding measured geophysical data; encoding the data residuals according to source using the same encoding as was used in generating the simulated encoded data; using the encoded data residuals to compute an update to the initial physical properties model; and combining the update with the initial model to form an updated physical properties model.
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21. A computer program product, comprising a non-transitory computer usable medium having a computer readable program code embodied therein, said computer readable program code adapted to be executed to implement a method for full-wavefield inversion of measured geophysical data to determine a physical properties model for a subsurface region, said method comprising:
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Constructing or inputting an initial physical properties model and using it to simulate synthetic data corresponding to the measured geophysical data, wherein sources and/or receivers in the simulation are encoded using selected encoding functions and simulated simultaneously, thereby generating simulated encoded data; separating the simulated encoded data according to source and/or receiver using a source or receiver separation algorithm, resulting in simulated sequential source and/or receiver data; processing the simulated sequential source and/or receiver data to mute those data, referred to as the missing data, corresponding to source and receiver combinations that are missing in the measured geophysical data; encoding the missing data, using encoding functions that are the same or different than said selected encoding functions; encoding the measured geophysical data, using encoding functions that are the same as used in the encoding the missing data, and subtracting them, according to source and receiver position, from the simulated encoded data, thereby generating encoded data residuals; subtracting the encoded missing data from the encoded data residuals to generate corrected encoded data residuals; using the corrected encoded data residuals to compute an update to the initial physical properties model; and combining the update with the initial model to form an updated physical properties model.
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22. A computer program product, comprising a non-transitory computer usable medium having a computer readable program code embodied therein, said computer readable program code adapted to be executed to implement a method for full-wavefield inversion of measured geophysical data to determine a physical properties model for a subsurface region, said method comprising:
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Constructing or inputting an initial physical properties model and using it to simulate synthetic data corresponding to the measured geophysical data, wherein sources and/or receivers in the simulation are encoded, using selected encoding functions, and simulated simultaneously, thereby generating simulated encoded data; using said selected encoding functions to encode the measured geophysical data and subtracting them, according to source and receiver position, from the simulated encoded data, thereby generating encoded data residuals; separating the encoded data residuals according to source and/or receiver using a source or receiver separation algorithm, resulting in sequential residual data; processing the sequential residual data to estimate simulated data, referred to as missing data, corresponding to source and receiver combinations that are missing in the measured geophysical data; encoding the missing data, using said selected encoding functions; subtracting the encoded missing data from the encoded data residuals to generate corrected encoded data residuals; using the corrected encoded data residuals to compute an update to the initial physical properties model; and combining the update with the initial model to form an updated physical properties model.
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Specification