Multi-Stage Noise Attenuation for Marine Seismic Survey Data
AssigneePGS Geophysical AS
InventorTruong Nguyen
Life of this patent
Estimating the term…
Abstract
Noise signals can be attenuated on a trace-by-trace basis from traces of marine seismic survey data to yield a signal component and a noise component. A signal-to-noise ratio (SNR) variance of a plurality of traces comprising the signal component can be less than an SNR variance of the plurality of traces comprising the marine seismic survey data. Signal leakage can be attenuated from the noise component to yield a signal leakage component. A seismic image of a subsurface location can be generated based on the signal component and the signal leakage component.
Claims22
A method of multi-stage noise attenuation for marine seismic survey data, comprising:
- attenuating noise signals on a trace-by-trace basis from a plurality of traces comprising the marine seismic survey data to yield a signal component and a noise component;
- wherein a signal-to-noise ratio (SNR) variance of a plurality of traces comprising the signal component is less than an SNR variance of the plurality of traces comprising the marine seismic survey data;
- attenuating signal leakage from the noise component to yield a signal leakage component;
- and
- generating a seismic image of a subsurface location based on the signal component and the signal leakage component.
A system for multi-stage noise attenuation for marine seismic survey data, comprising:
- a preprocessing engine configured to identify noisy traces in the marine seismic survey data;
- a trace-based noise attenuation engine configured to:
- transform the identified noisy traces into a time-frequency-offset cube;
- attenuate noise in a time-frequency (TF) atom of the time-frequency-offset cube based on information associated with neighboring TF atoms of the time-frequency-offset cube to denoise the time-frequency-offset cube;
- and
- transform the denoised time-frequency-offset cube back to a time-space (TX) domain to yield a signal component of the marine seismic survey data and a noise component of the marine seismic survey data;
- and
- a signal leakage attenuation engine configured to:
- decompose the signal component using a TF directional transform;
- estimate a signal leakage component from the decomposed signal component;
- and
- combine the estimated signal leakage component with the signal component to yield denoised marine seismic survey data.
A non-transitory machine-readable medium storing a set of instructions executable by a processing resource to:
- identify noisy traces and non-noisy traces of marine seismic survey data based on a threshold signal-to-noise ratio (SNR);
- transform the noisy traces to a TF cube by a complex wavelet packet transform;
- reduce broadband noise and spike noise from each TF atom of the noisy traces based on information of neighboring TF atoms in the TF cube;
- transform the denoised TF cube back to a time-space (TX) domain to yield a signal component and a noise component;
- transform the signal component into a directional filter bank (DFB) domain;
- estimate a signal leakage component from the transformed signal component by an adaptive thresholding using weighting masks in the DFB domain and a complex wavelet packet domain;
- and
- generate a seismic image based on the signal leakage component and the signal component.
A method to manufacture a geophysical data product, comprising:
- attenuating noise signals on a trace-by-trace basis from a plurality of traces comprising the marine seismic survey data to yield a signal component and a noise component;
- wherein a signal-to-noise ratio (SNR) variance of a plurality of traces comprising the signal component is less than an SNR variance of the plurality of traces comprising the marine seismic survey data;
- attenuating signal leakage from the noise component to yield a signal leakage component;
- and
- recording the signal component and the signal leakage component in a tangible machine-readable medium thereby completing the manufacture of the geophysical data product.
Dependencies are inferred from the claim text.