Determination of an Optimal Processing Flow for the Suppression of Free-Surface Multiples in Real 2d Marine Data

Gomes, Ellen de Nazaré Souza

doi:10.22564/rbgf.v31i1.252

Cited by 1 publication

(3 citation statements)

References 17 publications

(11 reference statements)

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“…That is very problematic as weak reflections which are masked by the multiple as it is often the case in shallow water archaeological prospection are also eliminated from data and signal of interest is lost. In e.g., [41,46] non of the applied methods or combination of methods including Predictive Deconvolution and SRME produced satisfactory results for the shallow water area investigated in these studies.…”

Section: Limitations Of the Traditional Methodsmentioning

confidence: 80%

“…Predictive Deconvolution is the oldest way of suppressing multiples, as these are events that have a strong periodic character [11]. It makes use of the assumption, that multiple reflections appear in a repetitive pattern, while primary reflections do not; therefore, the two can be separated based on statistics [40,41]. In order for this method to work properly, primaries are needed.…”

Section: Traditional Methods Applied For Comparison 231 Basic Methods 1: Predictive Deconvolutionmentioning

confidence: 99%

“…The most severe disadvantage of Predictive Deconvolution is that also primary events with a similar periodicity as the water-layer multiple are attenuated [46]. This was also shown by [41] where additionally artifacts are introduced by Predictive Deconvolution. With the water bottom not being perfectly flat, small variations in the reverberation period are introduced, effecting the attenuation result [42].…”

Section: Limitations Of the Traditional Methodsmentioning

confidence: 99%

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Attenuation of Seismic Multiples in Very Shallow Water: An Application in Archaeological Prospection Using Data Driven Approaches

2021

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Water-layer multiples pose a major problem in shallow water seismic investigations as they interfere with primaries reflected from layer boundaries or archaeology buried only a few meters below the water bottom. In the present study we evaluate two model-driven approaches (“Prediction and Subtraction” and “RTM-Deco”) to attenuate water-layer multiple reflections in very shallow water using synthetic and field data. The tests comprise both multi- and constant-offset data. We compare the multiple removal efficiency of the evaluated methods with two traditional methods (Predictive Deconvolution and SRME). Both model-driven approaches yield satisfactory results concerning the enhancement of primary energy and the attenuation of multiple energy. For the synthetic test cases, the multiple energy is reduced by at least 80% for the Prediction and Subtraction approach, and by more than 60% for the RTM-Deco approach. The application to two field data sets shows a significant amplification of primaries formerly hidden by the first water-layer multiple, with a reduction of multiple energy of up to 50%. The waveforms obtained from FD modeling match the true waveforms of the field data well and small deviations in time and amplitude can be removed by a time shift of the traces as well as an amplitude adaption to the field data. The field data examples should be emphasized, where the tested Prediction and Subtraction approach works significantly better than the traditional methods: the multiples are effectively predicted and attenuated while primary signals are highlighted. In conclusion, this shows that this method is particularly suitable in shallow water applications. Both evaluated multiple attenuation approaches could be successfully transferred to two other 3D systems used in shallow water near surface investigations. Especially the Prediction and Subtraction approach is able to enhance the primaries for both tested 3D systems with the multiple energy being reduced by more than 50%.

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Section: Limitations Of the Traditional Methodsmentioning

confidence: 80%

Section: Traditional Methods Applied For Comparison 231 Basic Methods 1: Predictive Deconvolutionmentioning

confidence: 99%

Section: Limitations Of the Traditional Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Attenuation of Seismic Multiples in Very Shallow Water: An Application in Archaeological Prospection Using Data Driven Approaches

2021

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Determination of an Optimal Processing Flow for the Suppression of Free-Surface Multiples in Real 2d Marine Data

Cited by 1 publication

References 17 publications

Attenuation of Seismic Multiples in Very Shallow Water: An Application in Archaeological Prospection Using Data Driven Approaches

Attenuation of Seismic Multiples in Very Shallow Water: An Application in Archaeological Prospection Using Data Driven Approaches

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