Hybrid method for full waveform inversion using simultaneous and sequential source method
First Claim
1. A computer-implemented method for full-wavefield inversion of measured geophysical data to determine a physical properties model for a subsurface region, comprising:
- using a computer to invert a selected shallow time window of arrivals from the measured geophysical data by simultaneous encoded sources and/or receivers inversion to obtain a first physical properties model for the subsurface region;
using a computer to invert the measured geophysical data, or a selected deep time window of arrivals from the measured geophysical data, by iterative sequential source inversion to obtain a second physical properties model for the subsurface region, wherein the first physical properties model is used as a starting model and a set of source locations is used to update the second physical properties model in the iterative sequential source inversion; and
outputting, displaying, or saving to data storage the second physical properties model of the subsurface region.
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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 for a subsurface region, especially suitable for surveys where fixed receiver geometry conditions were not satisfied in the data acquisition. First, a shallow time window of the data (202) where the fixed receiver condition is satisfied is inverted by simultaneous encoded (203) source inversion (205). Then, the deeper time window of the data (208) is inverted by sparse sequential source inversion (209), using the physical properties model from the shallow time window (206) as a starting model (207). Alternatively, the shallow time window model is used to simulate missing far offset data (211) producing a data set satisfying the stationary receiver assumption, after which this data set is source encoded (212) and inverted by simultaneous source inversion (214).
193 Citations
22 Claims
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1. A computer-implemented method for full-wavefield inversion of measured geophysical data to determine a physical properties model for a subsurface region, comprising:
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using a computer to invert a selected shallow time window of arrivals from the measured geophysical data by simultaneous encoded sources and/or receivers inversion to obtain a first physical properties model for the subsurface region; using a computer to invert the measured geophysical data, or a selected deep time window of arrivals from the measured geophysical data, by iterative sequential source inversion to obtain a second physical properties model for the subsurface region, wherein the first physical properties model is used as a starting model and a set of source locations is used to update the second physical properties model in the iterative sequential source inversion; and outputting, displaying, or saving to data storage the second physical properties model of the subsurface region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20)
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17. A computer-implemented method for full-wavefield inversion of measured geophysical data to determine a physical properties model for a subsurface region, comprising:
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using a computer to invert a selected shallow time window of arrivals from the measured geophysical data by simultaneous encoded sources and/or receivers inversion to obtain a first physical properties model for the subsurface region; using the first physical properties model to simulate, using a computer, synthetic data for longer offsets corresponding to arrivals from deeper than said shallow time window; using a computer to invert the measured geophysical data, wherein the data with longer offsets are augmented, said inversion being simultaneous encoded sources and/or encoded receivers inversion, to obtain a second physical properties model of the subsurface region, wherein said augmented data with longer offsets are sum of the synthetic data for longer offsets and the measured data at the longer offsets; and outputting, displaying, or saving to data storage the second physical properties model of the subsurface region. - View Dependent Claims (18, 19)
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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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inverting a selected shallow time window of arrivals from the measured geophysical data by simultaneous encoded sources and/or receivers inversion to obtain a first physical properties model for the subsurface region; inverting the measured geophysical data, or a selected deep time window of arrivals from the measured geophysical data, by iterative sequential source inversion to obtain a second physical properties model for the subsurface region, wherein the first physical properties model is used as a starting model and a set of source locations is used to update the second physical properties model in the iterative sequential source inversion; and outputting, displaying, or saving to data storage the second physical properties model of the subsurface region.
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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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inverting a selected shallow time window of arrivals from the measured geophysical data by simultaneous encoded sources and/or receivers inversion to obtain a first physical properties model for the subsurface region; using the first physical properties model to simulate synthetic data for longer offsets corresponding to arrivals from deeper than said shallow time window; inverting the measured geophysical data, wherein the data with longer offsets are augmented, said inversion being simultaneous encoded sources and/or encoded receivers inversion, to obtain a second physical properties model of the subsurface region, wherein said augmented data with longer offsets are sum of the synthetic data for longer offsets and the measured data at the longer offsets; and outputting, displaying, or saving to data storage the second physical properties model of the subsurface region.
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Specification