Adaptive subtraction is a key element in predictive multiple-suppression methods. It minimizes misalignments and amplitude differences between modeled and actual multiples, and thus reduces multiple contamination in the dataset after subtraction. Due to the high crosscorrelation between their waveform, the main challenge resides in attenuating multiples without distorting primaries. As they overlap on a wide frequency range, we split this wide-band problem into a set of more tractable narrow-band filter designs, using a 1D complex wavelet frame. This decomposition enables a single-pass adaptive subtraction via complex, single-sample (unary) Wiener filters, consistently estimated on overlapping windows in a complex wavelet transformed domain. Each unary filter compensates amplitude differences within its frequency support, and can correct small and large misalignment errors through phase and integer delay corrections. This approach greatly simplifies the matching filter estimation and, despite its simplicity, narrows the gap between 1D and standard adaptive 2D methods on field data * .
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AbstractThe cost and lurnaround of the seismic acquIsitIOn offshore h,lVC been drastically rcdueed in the last decade. One may argue thaI the industry has reached a stage where no more gains can hI.' made in terms or cost or turnaround. However, timc sharing and inrill acquisition still represent a heavy burden lln the e\plllratilln budgets. In this respec!' we present in this paper a technique that aims at populating gaps in the Cll\erage. When these gaps arc small. the lechnique replaces the widely uscd Ik\ hinning. When these gaps arc large. the Icchniquc aims al rcducing the inhlJ acquisition. In this paper \\'e test Ihc tcchnlquc on a swath rrom a survey that required a heavy infill. Thc L'(lillparison between the output of the proposed tcchniquc applied to the primary acquisition only and Ihe lotal aL'Ljuisili(ln (primary and infill) data set shows that this recllnstructilln scheme fills correctly the gaps in the coverage. The technique can thererore be considered as a processing approach 10 Ihe reduction of (hI.' infill in marine 3-D acquisition.
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