Tage Røsten's research while affiliated with Norwegian University of Science and Technology and other places
What is this page?
This page lists the scientific contributions of an author, who either does not have a ResearchGate profile, or has not yet added these contributions to their profile.
It was automatically created by ResearchGate to create a record of this author's body of work. We create such pages to advance our goal of creating and maintaining the most comprehensive scientific repository possible. In doing so, we process publicly available (personal) data relating to the author as a member of the scientific community.
If you're a ResearchGate member, you can follow this page to keep up with this author's work.
If you are this author, and you don't want us to display this page anymore, please let us know.
It was automatically created by ResearchGate to create a record of this author's body of work. We create such pages to advance our goal of creating and maintaining the most comprehensive scientific repository possible. In doing so, we process publicly available (personal) data relating to the author as a member of the scientific community.
If you're a ResearchGate member, you can follow this page to keep up with this author's work.
If you are this author, and you don't want us to display this page anymore, please let us know.
Publications (30)
We have tested the performance of 3D shot-profile depth migration using explicit migration operators on a real 3D marine data set. The data were acquired offshore Norway in an area with a complex subsurface containing large salt bodies. We compared shot-profile migration using explicit migration operators with conventional Kirchhoff migration, spli...
We present a transversely isotropic depth migration scheme for marine controlled-source electromagnetic (MCSEM) data, based on Claerbout's well-known 45 degree equation from seismic imaging. The proposed scheme is applicable to MCSEM data acquired with a 2-D geometry, and is numerically very efficient. We show examples from field data acquired offs...
The principle of the marine controlled-source electro-magnetic (CSEM) technique used for remote detection of hydrocarbons (HC), is described by Ellingsrud et al., (2002). A horizontal electrical dipole (HED) emits an ultra-low frequency (0.1–5 Hz) electromagnetic (EM) wavefield into the underlying seabed and downwards into the subsurface. EM energy...
The use of controlled source electromagnetics (CSEM) in the marine environment has grown rapidly in the past few years from a simple anomaly fluid-hunting technique used in geologically simple environments to a modeling and inversion based technique applied in structurally and lithologically complex environments (Carazzone et al., 2005). The tool s...
Trace headers are an integral part of seismic data. Uncompressed trace headers become a significant portion of the total volume of seismic data in case the associated trace data samples are compressed. We present an efficient lossless compression algorithm applicable for the trace headers of the SEG-Y standard. The proposed technique uses different...
Seismic data volumes, which require huge transmission capacities and massive storage media, continue to increase rapidly due to acquisition of 3D and 4D multiple streamer surveys, multicomponent data sets, reprocessing of prestack seismic data, calculation of post-stack seismic data attributes, etc. We consider lossy compression as an important too...
A multi-dimensional variable-length subband coder for prestack seismic data was presented. A 2-D and 3-D separable near perfect reconstruction filter bank was optimized to maximize the coding gain, assuming that the correlation properties of pre-stack seismic data can be modeled by directional dependent autoregressive processes. Identical quantizat...
We investigate the impact of lossy seismic data compression on the amplitudes of a North Sea 2-D seismic data set processed conventionally. Processing includes attenuation of waterbottom multiples, true amplitude recovery, predictive deconvolution, attenuation of peg-leg multiples, prestack time migration, and stacking. Two sequences of the lossy c...
In this paper we examine frequency-space filter techniques for optimal multiple attenuation of multicomponent ocean bottom seismic (OBS) data. Local frequency-space domain filters can be attractive when the seabed medium has lateral velocity variations or the data are irregularly sampled along the seafloor. We concentrate on pressure de-multiple by...
In this paper we present a subband decomposition approach to
seismic migration. It gives an interpretation of the seismic data in
terms of a multiscale representation. The proposed subband migration
consists of the usual extrapolation and imaging steps and provides a
scheme that in principle is efficient. The extrapolation and imaging
stages are pe...
A variable-length subband coder for seismic stack sections is
presented. A parallel FIR filter bank is optimized to maximize the
coding gain, while securing perfect reconstruction in the absence of
quantization, assuming that the correlation properties of stack sections
can be modelled by a separable autoregressive process. The entropy
coding schem...
The finite‐difference technique is used to model Scholte wave propagation excited by a P‐wave source in the water layer. The finite‐difference approach encompasses models in which the parameters are allowed to vary with position both vertically and laterally, and is well suited for studies of the acoustic field at and below the seafloor. The finite...
Current research and full-scale field surveys demonstrate that controlled source electromagnetic induction soundings (CSEMI) can be used for remote resistivity measurements in order to detect hydrocarbons prior to drilling wells in marine environments. The concept is based on the presence of high resistivity contrasts between saltwater-filled and h...
In this paper we examine frequency-space filter techniques for optimal multiple attenuation of multi-component ocean bottom seismic (OBS) data. Local frequency-space domain filters can be attractive when the seabed medium has lateral velocity variations or the data are irregularly sampled along the seafloor. We concentrate on pressure de-multiple b...
Citations
... The sea-surface profile may be measured or estimated at each channel location, for example, by methods discussed in Kragh et al 2004), Hardwick et al. (2015) and King and Poole (2015). We confirm that in our experience it is possible to use the f-x-y spectrum of selected events as a ghost-primary interferogram (Figure 2), and infer a sea surface profile from the frequency of ghost notches. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/272815429517318-1442055675439_Q64/Johan-Robertsson.jpg)
... An early survey is described by Ellingsrud et al. (2002). Further evaluations followed by Amundsen et al. (2004) and by Jurgen et al. (2009). The receivers contain all the signal recording equipment together with very accurate clocks. ...
... This method is particularly sensitive to highresistivity fluids like hydrocarbons and has therefore proven successful within petroleum exploration (Um and Alumbaugh, 2007;Constable, 2010). Initially, CSEM data were processed directly in the data domain using normalized magnitude and phase-versusoffset plots (Ellingsrud et al., 2002;Røsten et al., 2003). During the last 2 decades, and in parallel with the improvement in computing power, the processing of CSEM data has moved to the model domain through inversion. ...
... and c 0 55 is c 55 (Røsten et al., 1996). The values τ ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/272328131084324-1441939494753_Q64/Borge-Arntsen.jpg)
... The phase-shift-plus-interpolation (PSPI) method (Le Rousseau, 1997) is computationally intensive because many reference wavefields need to be formed for different reference velocities and anisotropy parameters. Conventional explicit methods (Zhang et al., 2001;Helgesen et al., 2003) are expensive in 3D, due to the large operator size required. The combination of the PSPI algorithm and explicit correction operator proposed recently (Baumstein and Andersonet, 2003), offers a partial solution to the cost problem by using a shorter explicit correction operator. ...
... The raw data that are continuously collected by the multi-component electromagnetic field receiver include the direct-source field transmitting directly through the seawater, reflections, and refractions, which are via the seawater-air interface (also known as airwaves), along the seabed, and through the subsurface layers. 12 When the MCSEM exploration is completed, the measured data recorded by the receiver need to be transformed and normalized. After data quality evaluation, correction, and noise suppression, a series of magnitude vs offset (MVO) curves and phase vs offset (PVO) curves can be obtained by combining the measured data and navigation data. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/661556362760194-1534738736821_Q64/Anwar-Bhuiyan.jpg)
... Thus, imaging the boundary of salt bodies is highly interesting problem. To solve this problem, various techniques using seismic data, such as migration (Arntsen et al., 2009;Leveille et al., 2011) and specialized attributes (Aqrawi et al., 2011;Berthelot et al., 2013), have been applied. However, the large seismic velocity contrast between the salt body and surrounding media and the complex shape of salt body essentially lower the quality of seismic data. ...
... Dans certains domaines d'application tels que : la parole, l'imagerie biomédicale, la géophysique, la cristallographie à rayon X,…etc., [Harasty88], [Raita94], [Rosten03], [Farsi06], [Willson94], [Djokic98], [Kurosu03]. ...
Reference: THESE Doctorat En Sciences MOUFFAK Adnane
... Moreover, because CSEM data are generally more sensitive to vertical resistivity, using an isotropic inversion scheme to an anisotropic earth biases the in version to w ards higher resisti vity v alues (Hoversten et al. 2006 ). We did not have access to vertical resistivity measurements for this project. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/278519302115333-1443415584196_Q64/G-Hoversten.jpg)
... Although other indicators that measure the impact of compression algorithms on standard seismic processing steps could be introduced and adopted (Rampa et al., 1999;Wu and Wang, Y., 1999;Røsten and Amundsen, 2001), for the sake of simplicity we do not discuss them here. ...
Reference: High-quality compression of MWD signals
