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Berkhout, A.J. (author), Blacquiere, G. (author)
Because of the strong sea surface reflectivity, a marine source generates both a direct wavefield and a ghost wavefield. This corresponds to a blended source array, the blending process being natural. Consequently, deghosting becomes deblending ('echo-deblending'). We discuss source deghosting by an iterative deblending algorithm that properly...
conference paper 2015
document
Blacquiere, G. (author), Berkhout, A.J. (author)
In marine acquisition both a direct wavefield and a ghost wavefield are produced as well as recorded. Hence, the seismic data can be considered to be a natural blend of four wavefields related to the real sources, ghost sources, real detectors and ghost detectors respectively. We consider deghosting to be deblending ('echo-deblending'), leading...
conference paper 2015
document
Berkhout, A.J. (author), Blacquiere, G. (author)
If we bring sources closer together, they start to `sense' the nearness of each other and their physical behaviour will change. If the separation becomes smaller than half a wavelength, they start to act as one source with new properties (temporal bandwidth, directivity). This fusion process is very complex and nonlinear. To find out whether...
conference paper 2015
document
Berkhout, A.J. (author)
Until today, seismic imaging is applied to primary reflections. This means that prior to imaging, the multiples need be removed from the measurements (‘data linearization’). However, multiples contain valuable information that should not be removed but should be utilized. The message of this presentation is that we should not adapt the measured...
conference paper 2015
document
Berkhout, A.J. (author), Blacquière, G. (author)
We show that deblended shot records have a better background-related S/N than shot records in unblended surveys. This improvement increases with increasing blending fold and decreasing survey time. An interesting consequence of this property is that blended surveys can be carried out under more severe noise conditions than unblended surveys. It...
journal article 2013
document
Berkhout, A.J. (author)
The next generation seismic processing system will comprise a chain of unified algorithms, from preprocessing to reservoir characterization. All these algorithms are formulated in terms of a closed-loop estimation problem, showing a great similarity with each other. A critical module in each algorithm is forward modeling, allowing feedback...
journal article 2013
document
Berkhout, A.J. (author), Blacquière, G. (author)
If simultaneous shooting is carried out by incoherent source arrays, being the condition of blended acquisition, the deblending process generates shot records with a very low residual interference (blending noise). We found, theoretically and numerically, that deblended shot records had a better background-related signal-to-noise ratio than shot...
journal article 2013
document
Bakker, M.C.M. (author), Rem, P.C. (author), Berkhout, S.P.M. (author)
The invention relates to a method of and a device for separating scrap comprising scrap items of a first type and of a second type, at least one of said types of scrap comprising metal. According to the invention, the method comprises the steps of passing a spot of light over the surface of a scrap item, and performing a plurality of successive...
patent 2013
document
Blacquière, G. (author), Berkhout, A.J. (author)
The amount of sources and detectors in the seismic method follows "Moore’s Law of seismic data acquisition", i.e., it increases approximately by a factor of 10 every 10 years. Therefore automation is unavoidable, leading to robotization of seismic data acquisition. Recently, we introduced a new source concept that replaces today’s complex, local...
journal article 2013
document
Berkhout, A.J. (author)
The concept of blending and deblending is reviewed, making use of traditional and dispersed source arrays. The network concept of distributed blended acquisition is introduced. A million-trace robot system is proposed, illustrating that decentralization may bring about a revolution in the way we acquire seismic data in the future.
journal article 2013
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Berkhout, A.J. (author), Verschuur, D.J. (author)
The next generation migration technology considers multiple scattering as vital information, allowing the industry to generate significantly better images of the subsurface. The proposed full wavefield algorithm (FWM) makes use of two-way wave theory that is formulated in terms of one-way wavefields. We show that the current migration algorithms...
conference paper 2012
document
Rem, P.C. (author), Bakker, M.C.M. (author), Berkhout, S.P.M. (author), Rahman, M.A. (author)
Eddy current separation apparatus (1) for separating particles (20) from a particle stream (w), wherein the apparatus (1) comprises a separator drum (4) adapted to create a first particle fraction (21) and a second particle fraction (23), a feeding device (2) upstream of the separator drum (4) for supplying particles (20) to said separator drum ...
patent 2012
document
Berkhout, J. (author), Bruggeman, F.J. (author), Teusink, B. (author)
One of the challenging tasks in systems biology is to understand how molecular networks give rise to emergent functionality and whether universal design principles apply to molecular networks. To achieve this, the biophysical, evolutionary and physiological constraints that act on those networks need to be identified in addition to the...
journal article 2012
document
Berkhout, A.J. (author)
Blended source arrays are historically configured with equal source units, such as broadband vibrators (land) and broadband air-gun arrays (marine). I refer to this concept as homogeneous blending. I have proposed to extend the blending concept to inhomogeneous blending, meaning that a blended source array consists of different source units....
journal article 2012
document
Berkhout, A.J. (author), Blacquiere, G. (author)
Until now, blended source arrays are configured with closely spaced source units, such as broadband airgun arrays (marine) and broadband vibrator arrays (land). In the latter case the source units are equal. We refer to this concept as homogeneous blending. In this paper the blending concept is extended to inhomogeneous blending, meaning that a...
conference paper 2012
document
Berkhout, A.J. (author)
The next generation seismic migration and inversion technology considers multiple scattering as vital information, allowing the industry to derive significantly better reservoir models — with more detail and less uncertainty — while requiring a minimum of user intervention. Three new insights have been uncovered with respect to this fundamental...
journal article 2012
document
Berkhout, A.J. (author), Blacquiere, G. (author), Verschuur, D.J. (author)
In traditional seismic surveys, the firing time between shots is such that the shot records do not interfere in time. However, in the concept of blended acquisition, the records do overlap, allowing denser source sampling and wider azimuths in an economic way. A denser shot sampling and wider azimuths make that each subsurface gridpoint is...
journal article 2012
document
Rem, P.C. (author), Berkhout, S.P.M. (author)
A method and apparatus for separating solid particles of different densities, using a magnetic process fluid. The solid particles are thoroughly mixed in a small partial flow of the process fluid. The small turbulent partial flow is added to a large laminar partial flow of the process fluid, after which the obtained mixture of the respective...
patent 2011
document
Rem, P.C. (author), Berkhout, S.P.M. (author)
Method for separating a non-ferrous metal-comprising fraction from ferrous scrap, wherein the ferrous scrap is conveyed to a processing device for separating the non-ferrous metal-comprising fraction from the remainder of the ferrous scrap. The processing device supplies a beam of water, and the ferrous scrap is conveyed and released into the...
patent 2010
document
Rem, P.C. (author), Berkhout, S.P.M. (author)
Using of an apparatus for separating magnetic pieces of scrap-material of a first group from magnetic pieces of scrap- material of a second group, wherein a mixture of pieces of scrap-material from the first group and from the second group is collectively transported with a conveyor to a separating zone, in which separating zone the pieces or...
patent 2010
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