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1-20 OF 543 RESULTS FOR
deghosting
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Journal Article
Free-surface multiple attenuation and seismic deghosting for blended data using convolutional neural networks
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 09 April 2024
Geophysics (2024) 89 (3): V281–V290.
... parameters (e.g., for ocean-bottom node acquisition and time-lapse monitoring studies). We illustrate the efficacy of our free-surface multiple attenuation and seismic deghosting method by presenting synthetic and field data applications. The numerical experiments demonstrate that our CNN-based approach...
Journal Article
Seismic deghosting using convolutional neural networks
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 29 March 2023
Geophysics (2023) 88 (3): V113–V125.
... to remove source-side ghosts because of the sparse source sampling. Satisfactory receiver-side deghosting solutions are facilitated by complementary measurements (e.g., particle motion data) for wavefield separation and also can be achieved using pressure data acquired at a single recording level only. We...
Journal Article
Source deghosting of coarsely sampled common-receiver data using a convolutional neural network
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 11 March 2021
Geophysics (2021) 86 (3): V185–V196.
...Jan-Willem Vrolijk; Gerrit Blacquière ABSTRACT It is well known that source deghosting can best be applied to common-receiver gathers, whereas receiver deghosting can best be applied to common-shot records. The source-ghost wavefield observed in the common-shot domain contains the imprint...
Journal Article
Removal of all time-varying sea-surface effects by source deghosting and demultiple
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 16 October 2019
Geophysics (2019) 84 (6): T347–T362.
...Elsa Cecconello; Endrias G. Asgedom; Walter Söllner ABSTRACT Seismic source deghosting and sea-surface-related demultiple have been long-standing problems in marine seismic data processing. Although the receiver ghost problem may be considered as solved by using collocated measurement of pressure...
Journal Article
Source deghosting by depth apparition
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 25 September 2017
Geophysics (2017) 82 (6): P89–P107.
... that is related to the recently introduced concept of signal apparition. As opposed to the temporal/spatial source signature modulation functions used in the original signal apparition theory, our source deghosting method relies on using sources at different depths but not at the same lateral positions. The new...
Journal Article
Broadband seismic over/under sources and their designature-deghosting
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 10 July 2017
Geophysics (2017) 82 (5): P61–P73.
..., in which sources are towed at two depths. We have developed a mathematical ghost model for over/under point sources fired in sequential and simultaneous modes, and we have found an inverse model, which on common receiver gathers can jointly perform designature and deghosting of the over/under source...
Journal Article
A low-frequency deghosting method: Analysis and numerical tests
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 27 June 2017
Geophysics (2017) 82 (5): V285–V296.
...Ying Wang; Adriana Citlali Ramirez; Are Osen ABSTRACT The low-frequency component of seismic data can be beneficial for several reasons: improved signal penetration into the earth, enhanced resolution, and better constrained inversion results. We have developed a detailed analysis of a deghosting...
Journal Article
Integrated receiver deghosting and closed-loop surface-multiple elimination
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 12 April 2017
Geophysics (2017) 82 (4): T133–T141.
... removal as a closed-loop process is that certain preprocessing steps can be included, which can lead to an improved multiple removal. In principle, the surface-related multiple elimination process requires deghosted data as input; thus, the source and receiver ghost must be removed. We have focused...
Journal Article
On seismic deghosting using Green’s theorem
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 31 May 2016
Geophysics (2016) 81 (4): V317–V325.
...Lasse Amundsen; Arne Reitan; Arthur B. Weglein; Bjørn Ursin ABSTRACT We have examined theoretically how receiver-side deghosting of pressure measurements can be derived from the Green’s theorem method. We split the Green’s function that obeys Dirichlet boundary conditions on the sea surface...
Journal Article
Wave equation processing using finite-difference propagators, Part 2: Deghosting of marine hydrophone seismic data
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 08 October 2014
Geophysics (2014) 79 (6): T301–T312.
...Johan O. A. Robertsson; Lasse Amundsen ABSTRACT We have developed a new and simple method for deghosting of conventional hydrophone streamer data towed at arbitrary variable depths. The method uses a time-space domain finite-difference (FD) solution to the wave equation with pressure field boundary...
Journal Article
On seismic deghosting by spatial deconvolution
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 25 October 2013
Geophysics (2013) 78 (6): V267–V271.
...Lasse Amundsen; Hongbo Zhou; Arne Reitan; Arthur B. Weglein ABSTRACT Receiver-side deghosting can be derived and implemented in the frequency domain as spatial deterministic deconvolution of marine pressure recordings. The deghosting/deconvolution operator is found analytically as the inverse...
Journal Article
On seismic deghosting using integral representation for the wave equation: Use of Green’s functions with Neumann or Dirichlet boundary conditions
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 04 June 2013
Geophysics (2013) 78 (4): T89–T98.
...Lasse Amundsen; Arthur B. Weglein; Arne Reitan ABSTRACT The recent interest in broadband seismic technology has spurred research into new and improved seismic deghosting solutions. One starting point for deriving deghosting methods is the representation theorem, which is an integral representation...
Journal Article
L1 pseudo- V z estimation and deghosting of single-component marine towed-streamer data
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 21 March 2013
Geophysics (2013) 78 (2): WA21–WA26.
...-component pressure data, while not fully reaching the quality of the optimally deghosted data from the over/sparse-under survey. 2013 Society of Exploration Geophysicists deconvolution marine signal processing wavelet For deghosting, we propose computation of the pseudo- V z...
Journal Article
Low-frequency seismic deghosting
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 20 March 2013
Geophysics (2013) 78 (2): WA15–WA20.
...Lasse Amundsen; Hongbo Zhou ABSTRACT We evaluated a solution to seismic deghosting that deghosts the low-frequency components of the seismic pressure data. In an approximation that neglected the dependence on wavenumbers, the low-frequency deghosted pressure field was computed trace-by-trace...
Journal Article
First application of Green’s theorem-derived source and receiver deghosting on deep-water Gulf of Mexico synthetic (SEAM) and field data
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 20 March 2013
Geophysics (2013) 78 (2): WA77–WA89.
...James D. Mayhan; Arthur B. Weglein ABSTRACT Deghosting benefits traditional seismic processing and is a prerequisite to all inverse-scattering-series based processing. The freedom of choosing a convenient reference medium (and associated Green’s function) means Green’s theorem offers a flexible...
Journal Article
Optimized deghosting of over/under towed-streamer data in the presence of noise
Journal: The Leading Edge
Publisher: Society of Exploration Geophysicists
Published: 01 February 2008
The Leading Edge (2008) 27 (2): 190–199.
... in data processing to provide the ghost-free data, known as the upgoing wavefield. This process of decomposing the recorded wavefield into up- and downgoing components is known as wavefield separation , or deghosting (Sønneland et al., 1986; Posthumus, 1993). Corresponding author: aozdemir...
Journal Article
Rough-sea deghosting of streamer seismic data using pressure gradient approximations
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 14 January 2005
Geophysics (2005) 70 (1): V1–V9.
...Lasse Amundsen; Tage R⊘sten; Johan O. A. Robertsson; Ed Kragh Abstract A new method is presented for seismic deghosting of towed streamer data acquired in rough seas. The deghosting scheme combines pressure recordings along one or several cables with an estimate of the vertical pressure gradient...
Journal Article
Rough-sea deghosting using a single streamer and a pressure gradient approximation
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 January 2002
Geophysics (2002) 67 (6): 2005–2011.
... elevation measurements of the wave height directly above the hydrophones are required—a measurement which is currently unavailable. The new deghosting method is fundamentally limited to frequencies below the first ghost notch. The lowest-order implementation requires that the streamer is towed no deeper...
Journal Article
Using even terms of the scattering series for deghosting and multiple attenuation of ocean-bottom cable data
Journal: Geophysics
Publisher: Society of Exploration Geophysicists
Published: 01 April 1999
Geophysics (1999) 64 (2): 579–592.
.... This method differs from the present dual-field deghosting method used in OBC data processing in that it does not assume a horizontally flat sea floor; nor does it require the knowledge of the acoustic impedance below the sea floor. Furthermore, it attenuates all free-surface multiples, including receiver...
Image
Comparison of shot record, frequency spectrum, and stacked sections to show...
in Deep reflection seismic data for improved imaging of crust structure: 2D case study of the southwest subbasin in the South China Sea
> Interpretation
Published: 25 March 2024
Figure 5. Comparison of shot record, frequency spectrum, and stacked sections to show results of conventional process, cable, and gun deghosting. (a) A shot gather before deghosting, (b) after cable deghosting, (c) after cable and source deghosting, (d) frequency spectrum before deghosting
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