Eiliv Skomedal
Statoil
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Publication
Featured researches published by Eiliv Skomedal.
Near Surface Geoscience 2014 - First Applied Shallow Marine Geophysics Conference | 2014
Joonsang Park; Maarten Vanneste; Laura Socco; Christian Madshus; Guillaume Sauvin; Eiliv Skomedal
We revisit a unique marine seismic data set collected with a densely populated ocean bottom cable (2.5 m effective channel spacing) and a prototype shear wave vibrator at the Gjoa field, offshore Norway. Whereas the survey was primarly designed for reservoir illumination, multi-modal surface waves stand out on the seismic data (both time-offset and frequency-wavenumber domains), in the frequency band between 3 and 35 Hz. As the source was operated in both in-line and cross-line direction, we identify multiple Scholte and Love waves that were subsequently used for a constrained inversion for obtaining a detailed shear wave velocity with depth, down to 50 m. In addition, a comparison of the velocities yields an estimate on shear wave anisotropy in the shallow sub-surface, with up to 15%. The data are further used to determine attenuation, a second critical parameter affecting wave propagation and dynamic response of seabed-founded structures, which can also be important for soil characterization. Tuned forward modelling of the fundamental surface wave mode yields shear wave damping of less than 1% for the deepwater soft soils. The attenuation coefficient increases linearly with frequency, and indicates that the damping is to a large degree viscous rather than due to hysteresis.
Spe Drilling & Completion | 2000
F.J. Santarelli; Eiliv Skomedal; Per Markestad; H.I. Berge; Håvard Nasvig
Geophysical Journal International | 2011
Maarten Vanneste; Christian Madshus; Valentina Socco; Margherita Maraschini; Per Sparrevik; Harald Westerdahl; Kenneth Duffaut; Eiliv Skomedal; Tore I. Bjørnarå
SPE Annual Technical Conference and Exhibition | 2006
Bikash K. Sinha; Badarinadh Vissapragada; Lasse Renlie; Eiliv Skomedal
Geophysical Journal International | 2011
Valentina Socco; Daniele Boiero; Margherita Maraschini; Maarten Vanneste; Christian Madshus; Harald Westerdahl; Kenneth Duffaut; Eiliv Skomedal
SPE Annual Technical Conference and Exhibition | 2007
Bikash K. Sinha; Badarinadh Vissapragada; Marit Kongslien; Anke Wendt; Hakan Eser; Lasse Renlie; Eiliv Skomedal; Erik Sandtorv Pedersen
Geophysical Journal International | 2011
Laura Socco; Daniele Boiero; Margherita Maraschini; Maarten Vanneste; Christian Madshus; Harald Westerdahl; Kenneth Duffaut; Eiliv Skomedal
SPE Annual Technical Conference and Exhibition | 2007
Anke Wendt; Marit Kongslien; Lasse Renlie; Erik Sandtorv Pedersen; Badarinadh Vissapragada; Eiliv Skomedal; Bikash K. Sinha
SPE Annual Technical Conference and Exhibition | 2007
Bikash K. Sinha; Badarinadh Vissapragada; Marit Kongslien; Anke Wendt; Hakan Eser; Lasse Renlie; Eiliv Skomedal; Erik Sandtorv Pedersen
SPE Annual Technical Conference and Exhibition | 2007
Anke Wendt; Marit Kongslien; Lasse Renlie; Erik Sandtorv Pedersen; Badarinadh Vissapragada; Eiliv Skomedal; Bikash K. Sinha