Surface multiple attenuation in seabeach‐shallow water, case study on data from the Bohai Sea

Hung, Barry; Yang, Kunlun; Zhou, Joe; Guo, Yujin; Xia, Qing Long

doi:10.1190/1.3513561

Cited by 18 publications

(12 citation statements)

References 10 publications

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“…The most challenging task in processing this data set was how to attenuate the multiples without damaging both primaries and receiver ghosts. Tests show Shallow Water De-multiple (SWD, Hung et. al, 2010) plus Taup-Decon is the most effective sequence.…”

Section: Final Pstm Imagesmentioning

confidence: 99%

Challenges in processing variable‐depth streamer data

Lin

Sablon

Gao

et al. 2011

SEG Technical Program Expanded Abstracts 2011

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Variable-depth streamer acquisition is emerging as a key technique for providing wide bandwidth seismic data. With several data sets acquired across the world, it has consistently produced high quality images in terms of seismic resolution, layer stratigraphy and low-frequency penetration. By varying receiver depth, variable-depth streamer acquisition introduces receiver ghost diversity over different offsets. Such diversity enables a joint deconvolution method to fully remove the receiver ghost. Variable-depth streamer data also tends to be less noisy due to the deep tow of cables. These two factors allow variabledepth streamer data to have a spectrum from 2.5 Hz up to the source notch. Challenges in processing include: how to maintain the full bandwidth in the data, how to effectively remove multiples, and how to robustly build a velocity model. This paper will discuss each of these challenges and their solutions.

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Section: Final Pstm Imagesmentioning

confidence: 99%

Challenges in processing variable‐depth streamer data

Lin

Sablon

Gao

et al. 2011

SEG Technical Program Expanded Abstracts 2011

View full text Add to dashboard Cite

show abstract

“…Data from the 'missing' streamers can be interpolated reasonably effectively using well-established methods in either the f-x domain (Spitz, 1991) or t-x domain (Claerbout, 1992), as long as the cross-line dip is reasonably benign. However, in cases where the sampling is inadequate even after interpolation, the multiple prediction and hence the reliability of the subtraction in 3d SRME is compromised (Baumstein et al, 2009) Van Borselen et al (2005), McHugo et al (2009) and Hung et al (2010) compare the effectiveness of 2D and 3D SRME on seismic data with significant seabed structure. However, in cases where the sampling is inadequate even after interpolation, the multiple prediction and hence the reliability of the subtraction in 3d SRME is compromised (Baumstein et al, 2009) Van Borselen et al (2005), McHugo et al (2009) and Hung et al (2010) compare the effectiveness of 2D and 3D SRME on seismic data with significant seabed structure.…”

Section: Srme: 2d Vs 3d Applicationmentioning

confidence: 99%

Multiples, Diffractions and Diffracted Multiples in the South China Sea: How Dense Does Our Acquisition Geometry Need to Be?

Quinn

Comeaux

2011

All Days

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U.S.A., Multiples, diffractions and their multiples are a common feature of marine seismic data. In some areas of the South China Sea, the residual multiples are a significant problem as they are coincident with the reservoir section. In such cases, we need to devote additional resources to further attenuate the multiples, particularly the diffracted multiples. The challenge is to assess how much effort is sufficient and whether that effort is required during data acquisition, data processing, or both?The work presented in this paper is the result of a real problem that we faced a couple of years ago when planning a seismic survey in the South China Sea. In the absence of 3D seismic data from nearby, the challenge was to demonstrate that 2D SRME would be inadequate in this area and that denser data acquisition would be required to attenuate multiples sufficiently to allow the 3D seismic data to be used for development drilling.The requirement for 3D SRME in areas with rugose seabeds or other multiple generating interfaces is well-documented (van Borselen et al 2005, McHugo et al 2009 and Hung et al 2010 for example).That is one aspect of the challenge faced in the area of this case study: the seabed is locally steeply-dipping and there are shallow diffractors that generate structurally complicated multiples. Both of these factors indicate that 3D SRME would be more effective at attenuating multiples on data from this area than 2D SRME; this requirement was successfully argued using analogue data examples.It is well understood that aliased multiples cannot be effectively attenuated during data processing. We used 2D lines where the seabed multiple was well-attenuated and only the diffracted multiples were troublesome to conduct a decimation test. Ambient noise was attenuated then traces were dropped without an anti-alias filter from 6.25m to give a trace spacing of 12.5m, 18.75m and 25m in the shot domain. This simulates the cross-line trace interval that would be achieved with 50m, 75m and 100m streamer spacing and dual source flip-flop acquisition geometry. Using this technique we were able to demonstrate that the minimum acceptable streamer spacing would be 75m, assuming that one pass of trace interpolation could be used prior to demultiple processing.

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“…In shallow water, short-period multiples have been usually attenuated by using predictive deconvolution in the x-t or tau-p domains (i.e., [5,6]). However, this approach attenuates all events with the period close to the water layer, including the primaries and interbed multiples.…”

Section: Introductionmentioning

confidence: 99%

Wave Equation Datuming Applied to Seismic Data in Shallow Water Environment and Post-Critical Water Bottom Reflection

2017

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Abstract:Coastal areas are generally characterized by human manufacturing; thus, seismic data analysis is necessary to characterize the properties of the subsoil, the main purpose of which is to clarify risk situations. In the case of very shallow water environments, seismic multiple attenuation becomes a challenge when the reflection of the seafloor is post-critical, so it is not recorded because of the acquisition parameters. We propose an approach to attenuate the multiples by using wave equation datuming that does not require the detection of seafloor reflection and avoids the seafloor reflection prediction and related approximations in the post-critical conditions. Moreover, this approach allows for the enhancement of higher frequencies, and, consequently, an increase in resolution, demonstrating that it is a powerful tool to attenuate multiples and reverberations, especially where other approaches are found to be inefficient. An example of the application of seismic data acquired in the continental shelf of South Chile is reported.

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Surface multiple attenuation in seabeach‐shallow water, case study on data from the Bohai Sea

Cited by 18 publications

References 10 publications

Challenges in processing variable‐depth streamer data

Challenges in processing variable‐depth streamer data

Multiples, Diffractions and Diffracted Multiples in the South China Sea: How Dense Does Our Acquisition Geometry Need to Be?

Wave Equation Datuming Applied to Seismic Data in Shallow Water Environment and Post-Critical Water Bottom Reflection

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