Schlumberger

Seismic Interference Noise Elimination (SINE)

Workflow attenuates seismic interference noise in marine seismic data

The seismic interference noise elimination workflow involves the design of a multidomain 3D spatial filter in the tau-p space to attenuate seismic interference (SI).The filter scans for SI noise on consecutive shots along the line, based on amplitude and frequency. SI noise amplitudes are identified and scaled to zero.

SI noise is extracted from the data by subtracting the SI-free tau-p record from the input tau-p record. This SI noise model is then transformed back to the x-t domain and subtracted from the original dataset.

Robust technique handles variability in input parameters

The 3D spatial filter width, length, and window length may vary according to the spread of noise within the shot and across shots. The filter is generally designed once per survey and applied to all acquired shots in the survey.

The technique is robust and accommodates data from all water depths, as well as different source directions and SI amplitudes. No prior knowledge of the SI noise source position and no manual intervention—such as preselecting SI-contaminated shots and areas—is required.

Filter enhances multivessel and multimeasurement streamer data

The SINE workflow attenuates SI noise generated by other seismic vessels acquiring seismic surveys in the vicinity at the same time as the data in question is being acquired.

It is also used to attenuate SI noise in data acquired with a multimeasurement streamer system such as IsoMetrix marine isometric seismic technology. SINE is used as part of the noise attenuation workflow applied to pressure and accelerometer data prior to wavefield reconstruction and deghosting.

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