Seismic processing workflow for supressing coherent noise while retaining low-frequency signal

Patricia E. Gavotti and Don C. Lawton

ABSTRACT

Two different processing workflows were applied to the same dataset to evaluate the effect of noise attenuation methods while attempting to preserve low-frequency signal with the purpose of obtaining broadband seismic data to benefit inversion studies. The approach was based on a previously conditioned dataset with a conventional processing sequence versus applying a specialized processing sequence focused on attaining coherent noise. The conventional sequence used surface wave noise attenuation and spiking deconvolution processes, while the specialized sequence used radial filter and gabor deconvolution processes. The specialized processing flow resulted in better attenuation of low-frequency noise while succeeded in retaining the low frequency signal. In comparison with the previous processed stacked, current result showed higher low-frequency content around the target zone (~ 5-9 Hz) than the previous processing (~ 9-14 Hz), but showed a structural depression in the middle part of the section possibly related with a shallow channel caused by an old meander of the North Saskatchewan River. However, no velocity or statics anomalies were observed during the processing of this dataset.

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