...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...

...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...

... 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...

..., 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...

...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...

... 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...

...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...

...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...

...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...

...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...

...-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 To compute the data of the vertical component of the particle motion...

...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...

...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...

... components is known as wavefield separation , or deghosting (Sønneland et al., 1986; Posthumus, 1993). Figure 2. The low-frequency signal level reduction as a result of shallow tow. In this plot, the decrease in the low-frequency signal strength is plotted relative to the signal strength...

...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...

... 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...

.... 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...