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Bjørn Ursin - Annual report 2009
BJORN URSIN: VISTA report 2008-2009
Research
The research has mainly been focused on seismic methods, and with one PhD student working on marine controlled source electro-magnetic (mCSEM) modeling and inversion.
A new 3D Kirchhoff based approach to seismic modeling has been developed from the tip-wave superposition method. Effective transmission and reflection coefficients for curved interfaces in isotropic or transversely isotropic media provide accurate modeling results including diffractions and head waves.
Improved seismic data processing methods have been developed for non-hyperbolic velocity analysis, geometrical spreading correction for long-offset seismic data and a fast and stable parabolic Radon transform for multiple attenuation and data interpolation. These methods have been applied to data from the Gulf of Mexico.
Seismic migration and imaging has been a main activity. New results have been published on imaging of doubly reflected waves reflected off steeply dipping formations like salt flanks, a stabilized least-squares imaging condition, adaptive focusing windows for seismic angle migration, and methods for wide-angle, one-way wave-equation propagation and imaging of non-converted and converted waves in transversely isotropic media. These methods are useful for imaging with dual-sensor streamer data and data recorded at the seafloor. 2D and 3D versions of the new algorithm have been applied to data from the North Sea. A new approach to seismic imaging using curvelets is being developed in cooperation with professor M. V. de Hoop at Purdue University.
Stereotomography is a slope tomographic method which gives good results for background velocity model estimation in isotropic media. We have developed an extension to 3D anisotropic media for PP and PS reflections, but without taking into account the issue of shear wave degeneracy. Testing on field data is in progress.
We have developed a stochastic simulation approach to the estimation of PP and PS reflection coefficients and elastic parameters from seismic amplitudes. Application has been to data from the Sleipner field. An alternative approach which we have considered is non-linear amplitude-versus-angle inversion and depth imaging in stratified media.
Marine mCSEM data have been modeled and inverted with a contrast source formulation of Maxwell´s equations assuming a transversely isotropic medium. Results with data from the Troll fields indicate that a transversely isotropic medium formulation gives better results than assuming an isotropic medium.
Honors
Biography included in Marquis Who's Who in the World, 1989-90, 1991-92, 1993-94, 2009.
Professional activity
Member of the Editorial Advisory Board of Trends in Geophysical Research, 2003 - .
Member of the Editorial Board of Journal of Geophysics and Engineering, 2004 - .
Member of the Organizing Committee of the Workshop on Seismic Reflection Imaging, Seeheim, 2005.
Member of the Steering Committee of the EAGE/SEG Research Workshop; ‘Multicomponent seismic - past, present and future’, Pau, 2005.
Member of the Steering Committee of the Lofoten seminar, 2008 - .
Co-convenor of the workshop: Seismic imaging – in tribute to Sergey Goldin. The 11th International Congress of the Brazilian Geophysical Society, Salvador, August 25, 2009.
Co-convenor of the EAGE/SEG Research Workshop: “Frequency attenuation and resolution of seismic data”, Barcelona, Spain, September 14-15, 2009.
Graduated PhD´s
Milana Ayzenberg: Three-dimensional seismic diffraction modeling. Doctoral theses at NTNU, 2008:304.
Tor Erik Rabben: Non-linear Bayesian inversion of seismic reflection amplitudes. Doctoral theses at NTNU, 2009:146.
PhD students
Steinar Nag, Stereotomography.
Orjan Pedersen, Wide-angle seismic migration.
Brahim Abbad, Velocity analysis and Radon transform.
Torgeir Wiik, Modeling and inversion of mCSEM data.
Erlend Aune, Estimation of wavelet and elastic parameters.
Publications
Alerini, M., and Ursin, B., 2009, Adaptive focusing window for seismic angle migration. Geophysics, 74, no. 1, S1-S10.
Abbad, B., Ursin, B., and Rappin, D., 2009, Automatic nonhyperbolic velocity analysis. Geophysics, 74, no. 2, U1-U12.
Malcolm, A.E., Ursin, B., and de Hoop, M.V., 2009, Seismic imaging and illumination with internal multiples. Geophysical Journal International, 176, 847-864.
Ayzenberg, M.A., Aizenberg, A.M., and Ursin, B., 2009, Tip-wave superposition method with effective reflection and transmission coefficients: a new 3D Kirchhoff-based approach to synthetic seismic modeling. The Leading Edge, 582-588.
Vivas, F.A., Pestana, R.C., and Ursin, B., 2009, A new stabilized least-squares imaging condition. Journal of Geophysics and Engineering, 6, 264-268.
Ursin, B., Tygel, M., and Iversen, E., 2009, SS traveltime parameters from PP and PS reflections. Geophysics, 74, no.4, R35-R47.
Stovas, A., and Ursin, B., 2009, Improved geometrical spreading approximation in layered transversely isotropic media. Geophysics, 74, no. 5., D85-D95.
Ayzenberg, M., Tsvankin, I., Aizenberg, A., and Ursin, B., 2009, Effective reflection coefficients for curved interfaces in transversely istotropic media. Geophysics, 74, no. 5, W33-W53.
Deplante, C., and Ursin, B., 2009, Frequency attenuation and resolution of seismic data receive the full treatment at research workshop. First Break, 27, no. 11, 9-12.
Expanded abstracts
Wiik, T., Ursin, B., and Hokstad, K., 2009, 2.5D frequency domain EM modeling in conductive TIV media. 71st EAGE Conference, Amsterdam, Extended abstracts, P076.
Ayzenberg, M., Aizenberg, A., Helle, H.B., Klem-Musatov, K.D., Paichel, J., and Ursin, B., 2009, Our experience of 3D synthetic seismic modeling with tip-wave superposition method and effective coefficients. 71st EAGE Conference, Amsterdam. Extended abstracts, P137.
Amundsen, L., Arntsen, B., Reitan, A., and Ursin, B., 2009, Wave-equation depth migration in elastic media – new results. 71st EAGE conference, Amsterdam. Extended abstracts, U001.
Malcolm, A., Ursin, B., and de Hoop, M.V., 2009, Imaging with multiply scattered waves. Waves 2009, Pau. Proceedings, 420-421.
Ursin, B., Abbad, B., Porsani, M.J., 2009, Multiple attenuation with a modified parabolic Radon transform. 11th International Congress of the Brazilian Geophysical Society, Salvador.
Ursin, B., Tygel, M., and Iversen, E., 2009, SS-traveltime parameters from PP- and PS-reflections. 11th International Congress of the Brazilian Geophysical Society, Salvador.
Porsani, M.J., Silva, M.G., and Ursin, B., 2009, Filtragem do groundroll utilizando SVD. 11th International Congress of the Brazilian Geophysical Society, Salvador.
Ursin, B., Stovas, A., and Toverud, T., 2009, Seismic attenuation and dispersion models – theory and VSP data analysis, EAGE-SEG Research workshop, Barcelona, Extended abstracts.
Tyapkin, Y., Ursin, B., Silinska, O., and Tiapkina, O., 2009, Zero- and first-order approximations for least-squares estimation of seismic signal contaminated by coherent and random noise of complex structure. 79th SEG Meeting, Houston, Expanded abstracts, 3274-3278.
Wang, S., de Hoop, M.V., and Ursin, B., 2009, Illumination analysis of wave-equation imaging with “curvelets”. 79th SEG Meeting, Houston, Expanded abstracts, 2362-2367.
Porsani, M.J., Silva, M.G., Melo, P.E.M., and Ursin, B., 2009, Ground-roll attenuation based on SVD filtering. 75th SEG Meeting, Houston, Expanded abstracts, 3381-3385.
Papers submitted
Pedersen, Ø., Brandsberg-Dahl, S., and Ursin, B., 2009, Seismic imaging using lateral adaptive windows. Geophysics, accepted for publication.
Abbad, B., Ursin, B., and Porsani, M.J., 2009, A fast modified parabolic Radon transform. Geophysics, submitted.
Wang, S., de Hoop, M.V., and Ursin, B., 2009, Illumination analysis of wave-equation imaging with curvelets. Inverse Problems, submitted.
Wiik, T., Ursin, B., and Hokstad, K., 2009, 2.5D EM modeling in TIV conductive media. Geophysics, submitted.
Nag, S., Alerini, M., and Ursin, B., 2008, PP/PS anisotropic stereotomography. Geophysical Journal International, accepted for publication.
Tyapkin, Y., Ursin, B., Perroud, H., Silinska, O., and Tiapkina, O., 2009, Zero- and first-order approximations for least-squares estimation of seismic signal with coherent and random noise. Journal of Geophysics and Engineering, accepted for publication.
Pedersen, Ø., Ursin, B., and Helgesen, H.-K., 2009, One-way wave-equation migration of compressional and converted waves in a VTI medium. Geophysics, submitted.
Research
The research has mainly been focused on seismic methods, and with one PhD student working on marine controlled source electro-magnetic (mCSEM) modeling and inversion.
A new 3D Kirchhoff based approach to seismic modeling has been developed from the tip-wave superposition method. Effective transmission and reflection coefficients for curved interfaces in isotropic or transversely isotropic media provide accurate modeling results including diffractions and head waves.
Improved seismic data processing methods have been developed for non-hyperbolic velocity analysis, geometrical spreading correction for long-offset seismic data and a fast and stable parabolic Radon transform for multiple attenuation and data interpolation. These methods have been applied to data from the Gulf of Mexico.
Seismic migration and imaging has been a main activity. New results have been published on imaging of doubly reflected waves reflected off steeply dipping formations like salt flanks, a stabilized least-squares imaging condition, adaptive focusing windows for seismic angle migration, and methods for wide-angle, one-way wave-equation propagation and imaging of non-converted and converted waves in transversely isotropic media. These methods are useful for imaging with dual-sensor streamer data and data recorded at the seafloor. 2D and 3D versions of the new algorithm have been applied to data from the North Sea. A new approach to seismic imaging using curvelets is being developed in cooperation with professor M. V. de Hoop at Purdue University.
Stereotomography is a slope tomographic method which gives good results for background velocity model estimation in isotropic media. We have developed an extension to 3D anisotropic media for PP and PS reflections, but without taking into account the issue of shear wave degeneracy. Testing on field data is in progress.
We have developed a stochastic simulation approach to the estimation of PP and PS reflection coefficients and elastic parameters from seismic amplitudes. Application has been to data from the Sleipner field. An alternative approach which we have considered is non-linear amplitude-versus-angle inversion and depth imaging in stratified media.
Marine mCSEM data have been modeled and inverted with a contrast source formulation of Maxwell´s equations assuming a transversely isotropic medium. Results with data from the Troll fields indicate that a transversely isotropic medium formulation gives better results than assuming an isotropic medium.
Honors
Biography included in Marquis Who's Who in the World, 1989-90, 1991-92, 1993-94, 2009.
Professional activity
Member of the Editorial Advisory Board of Trends in Geophysical Research, 2003 - .
Member of the Editorial Board of Journal of Geophysics and Engineering, 2004 - .
Member of the Organizing Committee of the Workshop on Seismic Reflection Imaging, Seeheim, 2005.
Member of the Steering Committee of the EAGE/SEG Research Workshop; ‘Multicomponent seismic - past, present and future’, Pau, 2005.
Member of the Steering Committee of the Lofoten seminar, 2008 - .
Co-convenor of the workshop: Seismic imaging – in tribute to Sergey Goldin. The 11th International Congress of the Brazilian Geophysical Society, Salvador, August 25, 2009.
Co-convenor of the EAGE/SEG Research Workshop: “Frequency attenuation and resolution of seismic data”, Barcelona, Spain, September 14-15, 2009.
Graduated PhD´s
Milana Ayzenberg: Three-dimensional seismic diffraction modeling. Doctoral theses at NTNU, 2008:304.
Tor Erik Rabben: Non-linear Bayesian inversion of seismic reflection amplitudes. Doctoral theses at NTNU, 2009:146.
PhD students
Steinar Nag, Stereotomography.
Orjan Pedersen, Wide-angle seismic migration.
Brahim Abbad, Velocity analysis and Radon transform.
Torgeir Wiik, Modeling and inversion of mCSEM data.
Erlend Aune, Estimation of wavelet and elastic parameters.
Publications
Alerini, M., and Ursin, B., 2009, Adaptive focusing window for seismic angle migration. Geophysics, 74, no. 1, S1-S10.
Abbad, B., Ursin, B., and Rappin, D., 2009, Automatic nonhyperbolic velocity analysis. Geophysics, 74, no. 2, U1-U12.
Malcolm, A.E., Ursin, B., and de Hoop, M.V., 2009, Seismic imaging and illumination with internal multiples. Geophysical Journal International, 176, 847-864.
Ayzenberg, M.A., Aizenberg, A.M., and Ursin, B., 2009, Tip-wave superposition method with effective reflection and transmission coefficients: a new 3D Kirchhoff-based approach to synthetic seismic modeling. The Leading Edge, 582-588.
Vivas, F.A., Pestana, R.C., and Ursin, B., 2009, A new stabilized least-squares imaging condition. Journal of Geophysics and Engineering, 6, 264-268.
Ursin, B., Tygel, M., and Iversen, E., 2009, SS traveltime parameters from PP and PS reflections. Geophysics, 74, no.4, R35-R47.
Stovas, A., and Ursin, B., 2009, Improved geometrical spreading approximation in layered transversely isotropic media. Geophysics, 74, no. 5., D85-D95.
Ayzenberg, M., Tsvankin, I., Aizenberg, A., and Ursin, B., 2009, Effective reflection coefficients for curved interfaces in transversely istotropic media. Geophysics, 74, no. 5, W33-W53.
Deplante, C., and Ursin, B., 2009, Frequency attenuation and resolution of seismic data receive the full treatment at research workshop. First Break, 27, no. 11, 9-12.
Expanded abstracts
Wiik, T., Ursin, B., and Hokstad, K., 2009, 2.5D frequency domain EM modeling in conductive TIV media. 71st EAGE Conference, Amsterdam, Extended abstracts, P076.
Ayzenberg, M., Aizenberg, A., Helle, H.B., Klem-Musatov, K.D., Paichel, J., and Ursin, B., 2009, Our experience of 3D synthetic seismic modeling with tip-wave superposition method and effective coefficients. 71st EAGE Conference, Amsterdam. Extended abstracts, P137.
Amundsen, L., Arntsen, B., Reitan, A., and Ursin, B., 2009, Wave-equation depth migration in elastic media – new results. 71st EAGE conference, Amsterdam. Extended abstracts, U001.
Malcolm, A., Ursin, B., and de Hoop, M.V., 2009, Imaging with multiply scattered waves. Waves 2009, Pau. Proceedings, 420-421.
Ursin, B., Abbad, B., Porsani, M.J., 2009, Multiple attenuation with a modified parabolic Radon transform. 11th International Congress of the Brazilian Geophysical Society, Salvador.
Ursin, B., Tygel, M., and Iversen, E., 2009, SS-traveltime parameters from PP- and PS-reflections. 11th International Congress of the Brazilian Geophysical Society, Salvador.
Porsani, M.J., Silva, M.G., and Ursin, B., 2009, Filtragem do groundroll utilizando SVD. 11th International Congress of the Brazilian Geophysical Society, Salvador.
Ursin, B., Stovas, A., and Toverud, T., 2009, Seismic attenuation and dispersion models – theory and VSP data analysis, EAGE-SEG Research workshop, Barcelona, Extended abstracts.
Tyapkin, Y., Ursin, B., Silinska, O., and Tiapkina, O., 2009, Zero- and first-order approximations for least-squares estimation of seismic signal contaminated by coherent and random noise of complex structure. 79th SEG Meeting, Houston, Expanded abstracts, 3274-3278.
Wang, S., de Hoop, M.V., and Ursin, B., 2009, Illumination analysis of wave-equation imaging with “curvelets”. 79th SEG Meeting, Houston, Expanded abstracts, 2362-2367.
Porsani, M.J., Silva, M.G., Melo, P.E.M., and Ursin, B., 2009, Ground-roll attenuation based on SVD filtering. 75th SEG Meeting, Houston, Expanded abstracts, 3381-3385.
Papers submitted
Pedersen, Ø., Brandsberg-Dahl, S., and Ursin, B., 2009, Seismic imaging using lateral adaptive windows. Geophysics, accepted for publication.
Abbad, B., Ursin, B., and Porsani, M.J., 2009, A fast modified parabolic Radon transform. Geophysics, submitted.
Wang, S., de Hoop, M.V., and Ursin, B., 2009, Illumination analysis of wave-equation imaging with curvelets. Inverse Problems, submitted.
Wiik, T., Ursin, B., and Hokstad, K., 2009, 2.5D EM modeling in TIV conductive media. Geophysics, submitted.
Nag, S., Alerini, M., and Ursin, B., 2008, PP/PS anisotropic stereotomography. Geophysical Journal International, accepted for publication.
Tyapkin, Y., Ursin, B., Perroud, H., Silinska, O., and Tiapkina, O., 2009, Zero- and first-order approximations for least-squares estimation of seismic signal with coherent and random noise. Journal of Geophysics and Engineering, accepted for publication.
Pedersen, Ø., Ursin, B., and Helgesen, H.-K., 2009, One-way wave-equation migration of compressional and converted waves in a VTI medium. Geophysics, submitted.
Program for the VISTA Day 2009
VISTA Scholars' Day 2010