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dc.contributor.authorWu, Zedong
dc.contributor.authorAlkhalifah, Tariq Ali
dc.date.accessioned2015-08-04T07:23:06Z
dc.date.available2015-08-04T07:23:06Z
dc.date.issued2014
dc.identifier.isbn9781632666949
dc.identifier.doi10.3997/2214-4609.20140706
dc.identifier.urihttp://hdl.handle.net/10754/564852
dc.description.abstractFull waveform inversion (FWI) despite it's potential suffers from the ability to converge to the desired solution due to the high nonlinearity of the objective function at conventional seismic frequencies. Even if frequencies necessary for the convergence are available, the high number of iterations required to approach a solution renders FWI as very expensive (especially in 3D). A spectral implementation in which the wavefields are extrapolated and gradients are calculated in the wavenumber domain allows for a cleaner more efficient implementation (no finite difference dispersion errors). In addition, we use not only an up and down going wavefield decomposition of the gradient to access the smooth background update, but also a right and left propagation decomposition to allow us to do that for large dips. To insure that the extracted smooth component of the gradient has the right decent direction, we solve an optimization problem to search for the smoothest component that provides a negative (decent) gradient. Application to the Marmousi model shows that this approach works well with linear increasing initial velocity model and data with frequencies above 2Hz.
dc.publisherEAGE Publications
dc.titleFull waveform inversion based on the optimized gradient and its spectral implementation
dc.typeConference Paper
dc.contributor.departmentEarth Science and Engineering Program
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentSeismic Wave Analysis Group
dc.identifier.journalProceedings 76th EAGE Conference and Exhibition 2014
dc.conference.date16 June 2014 through 19 June 2014
dc.conference.name76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014
dc.conference.locationAmsterdam
kaust.personAlkhalifah, Tariq Ali
kaust.personWu, Zedong


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