Methods and devices performing adaptive quadratic Wasserstein full-waveform inversion
AssigneeCgg Services SAS
InventorsDiancheng Wang, Ping Wang
Life of this patent
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Abstract
Methods and devices for seismic exploration of an underground structure apply W2-based full-wave inversion to transformed synthetic and seismic data. Data transformation ensures that the synthetic and seismic data are positive definite and have the same mass using an adaptive normalization. This approach yields superior results particularly when the underground structure includes salt bodies.
Claims20
A method of seismic exploration of an underground structure using a Wasserstein metric-based full-wave inversion, FWI, the method comprising:
- obtaining seismic data acquired over the explored underground structure;
- generating synthetic data based on a velocity model;
- transforming the synthetic data and the seismic data by integrating a difference between the synthetic and the seismic data along each trace to generate transformed synthetic data and corresponding to null transformed seismic data;
- applying a linear normalization to traces of the transformed synthetic and the transformed seismic data using an adaptive normalization so that normalized corresponding traces to have same mass;
- updating the velocity model by applying the Wasserstein metric-based FWI to the normalized corresponding traces of the transformed synthetic and seismic data;
- and
- determining presence of natural resources in the explored underground structure based on the updated velocity model.
A seismic data processing apparatus configured to perform seismic exploration of an underground structure using a Wasserstein metric-based full-wave inversion, FWI, the apparatus comprising:
- an interface configured to obtain seismic data acquired over the explored underground structure;
- and
- a data processing unit connecting to the interface and configured
- to generate synthetic data based on a velocity model;
- to transform the synthetic data and the seismic data by integrating a difference between the synthetic and the seismic data along each trace to generate transformed synthetic data corresponding to null transformed seismic data;
- to apply a linear normalization to traces of the transformed synthetic data and the transformed seismic data using an adaptive normalization so that normalized corresponding traces to have same mass;
- to update the velocity model by applying the Wasserstein metric-based FWI using the normalized corresponding traces of the transformed synthetic and of the seismic data;
- and
- to determine presence of natural resources in the explored underground structure based on the updated velocity model.
A computer readable storage medium storing executable codes, which, when executed by a processor, make the processor perform a method of seismic exploration of an underground structure using a Wasserstein metric-based full-wave inversion, FWI, the method comprising:
- obtaining seismic data acquired over the explored underground structure;
- generating synthetic data based on a velocity model;
- transforming the synthetic data and the seismic data by integrating a difference between the synthetic and the seismic data along each trace to generate transformed synthetic data corresponding to null transformed seismic data;
- applying a linear normalization to traces of the transformed synthetic and the transformed seismic data using an adaptive normalization so that normalized corresponding traces to have same mass;
- updating the velocity model by applying the Wasserstein metric-based FWI to the normalized corresponding traces of the transformed synthetic and seismic data;
- and
- determining presence of natural resources in the explored underground structure based on the updated velocity model.
Dependencies are inferred from the claim text.