2‐D deghosting using vertical receiver arrays

Sønneland, L.; Berg, Lurs E.; Eidsvig, Per; Haugen, Arild; Fotland, B.; Vestby, J.

doi:10.1190/1.1893019

Cited by 55 publications

(19 citation statements)

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“…The over-under deghosting method (e.g., Hill et al, 2006;Sonneland et al, 1986) deploys streamers at two different cable depths and at the (ideally) same lateral position, that is, as vertically aligned streamer pairs. Choosing the cable depths such that the ghost notches are complimentary to each other (i.e., where one streamer has a notch, the other has a peak) allows the notches to be filled by essentially using data from either cable where there is no notch.…”

Section: Single-streamer Deghosting Methodsmentioning

confidence: 99%

“…Although the over-under method was published in the 1980s (e.g., Sonneland et al, 1986), the method was not widely accepted due to the difficulty of controlling the streamers at the different depths due to crosscurrents. This was overcome two decades later with the advent of lateral streamer steering, and Hill et al (2006) and Moldoveanu et al (2007) gave examples of successful application to bandwidth extension.…”

Section: Single-streamer Deghosting Methodsmentioning

confidence: 99%

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Tools and Techniques: Marine Seismic Methods

Robertsson

Laws²,

Kragh³

2015

Treatise on Geophysics

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Section: Single-streamer Deghosting Methodsmentioning

confidence: 99%

Section: Single-streamer Deghosting Methodsmentioning

confidence: 99%

Tools and Techniques: Marine Seismic Methods

Robertsson

Laws²,

Kragh³

2015

Treatise on Geophysics

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“…In particular, Sonneland et al (1986) showed how two or more streamers towed at different depths can be used to eliminate the ghost notch at the receiver side, thus increasing the bandwidth of the received signal, while Singh, Hobbs and Snyder (1996) used the same idea and produced very good results. This includes developing new source arrays and acquisition configurations that would provide even more energy in the desired bandwidth.…”

Section: O N C L U S I O N Smentioning

confidence: 99%

The use of low frequencies for sub‐basalt imaging

Ziolkowski¹,

Hanssen²,

Gatliff³

et al. 2001

SEG Technical Program Expanded Abstracts 2001

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Many prospective passive ocean margins are covered by large areas of basalts. These basalts are often extremely heterogeneous and scatter the seismic energy of the conventional seismic reflection system so that it becomes difficult to obtain information on deeper reflectors. Since high frequencies are scattered more than low frequencies, we argue that the acquisition system for sub‐basalt targets should be modified to emphasize the low frequencies, using much larger airguns, and towing the source and receivers at about 20 m depth. In the summer of 2001 we obtained seismic reflection data over basalt in the northeast Atlantic using a system modified to enhance the low‐frequency energy. These new data show deep reflections that are not visible on lines shot in the same places with a conventional system.

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“…Thus, notch removal has received considerable attention. Borrowing ideas from wavefield separation methods (Sønneland and Berg, 1985;Sønneland et al, 1986;Posthumus, 1993), Moldoveanu (2000) and Egan et al (2007) took advantage of the over/under source to remove the ghost infl uence. However, this approach sacrifi ced shot density.…”

Section: Introductionmentioning

confidence: 99%

Modeling of multi-depth slanted airgun source for deghosting

et al. 2014

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To obtain high-resolution of the subsurface structure, we modeled multidepth slanted airgun sources to attenuate the source ghost. By fi ring the guns in sequence according to their relative depths, such a source can build constructive primaries and destructive ghosts. To evaluate the attenuation of ghosts, the normalized squared error of the spectrum of the actual vs the expected signature is computed. We used a typical 680 cu.in airgun string and found via simulations that a depth interval of 1 or 1.5 m between airguns is optimum when considering deghosting performance and operational feasibility. When more subarrays are combined, preliminary simulations are necessary to determine the optimum depth combination. The frequency notches introduced by the excess use of subarrays may negatively affect the deghosting performance. Two or three slanted subarrays can be combined to remove the ghost effect. The sequence combination may partly affect deghosting but this can be eliminated by matched filtering. Directivity comparison shows that a multi-depth slanted source can signifi cantly attenuate the notches and widen the energy transmission stability area.

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2‐D deghosting using vertical receiver arrays

Cited by 55 publications

References 0 publications

Tools and Techniques: Marine Seismic Methods

Tools and Techniques: Marine Seismic Methods

The use of low frequencies for sub‐basalt imaging

Modeling of multi-depth slanted airgun source for deghosting

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