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Dive into the research topics where Eiliv Skomedal is active.

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Featured researches published by Eiliv Skomedal.


Near Surface Geoscience 2014 - First Applied Shallow Marine Geophysics Conference | 2014

Multi-modal Surface Waves for Site Characterization - Results from a Unique Marine Shear Wave Experiment

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

Sand Production on Water Injectors: How Bad Can It Get?

F.J. Santarelli; Eiliv Skomedal; Per Markestad; H.I. Berge; Håvard Nasvig


Geophysical Journal International | 2011

On the use of the Norwegian Geotechnical Institute's prototype seabed‐coupled shear wave vibrator for shallow soil characterization – I. Acquisition and processing of multimodal surface waves

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

Horizontal Stress Magnitude Estimation using the Three Shear Moduli - A Norwegian Sea Case Study

Bikash K. Sinha; Badarinadh Vissapragada; Lasse Renlie; Eiliv Skomedal


Geophysical Journal International | 2011

On the use of the Norwegian Geotechnical Institute's prototype seabed-coupled shear wave vibrator for shallow soil characterization - II. Joint inversion of multimodal Love and Scholte surface waves

Valentina Socco; Daniele Boiero; Margherita Maraschini; Maarten Vanneste; Christian Madshus; Harald Westerdahl; Kenneth Duffaut; Eiliv Skomedal


SPE Annual Technical Conference and Exhibition | 2007

Estimation of Formation Stresses Using Radial Variation of Three Shear Moduli—A Case Study From a High-Pressure and High-Temperature Reservoir in a Norwegian Continental Shelf

Bikash K. Sinha; Badarinadh Vissapragada; Marit Kongslien; Anke Wendt; Hakan Eser; Lasse Renlie; Eiliv Skomedal; Erik Sandtorv Pedersen


Geophysical Journal International | 2011

On the use of NGI’s prototype seabed‐coupled shear wave vibrator for 1 shallow soil characterization – Part II: Joint Inversion of multi‐modal Love and Scholte surface waves

Laura Socco; Daniele Boiero; Margherita Maraschini; Maarten Vanneste; Christian Madshus; Harald Westerdahl; Kenneth Duffaut; Eiliv Skomedal


SPE Annual Technical Conference and Exhibition | 2007

Advanced Mechanical Earth Modelling And Wellbore-Stability Calculation Using Advanced Sonic Measurements: A Case Study on an HP/HT Field in the Norwegian North Sea

Anke Wendt; Marit Kongslien; Lasse Renlie; Erik Sandtorv Pedersen; Badarinadh Vissapragada; Eiliv Skomedal; Bikash K. Sinha


SPE Annual Technical Conference and Exhibition | 2007

Estimation of Formation Stresses Using Radial Variation of the Three Shear Moduli in a Well--A Case Study From a High-Pressure and High-Temperature Field in the Norwegian Continental Shelf

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

Enhanced Mechanical Earth Modelling and Wellbore Stability Calculations Using Advanced Sonic Measurements—A Case Study of the HP/HT Kvitebjorn Field in the Norwegian North Sea

Anke Wendt; Marit Kongslien; Lasse Renlie; Erik Sandtorv Pedersen; Badarinadh Vissapragada; Eiliv Skomedal; Bikash K. Sinha

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Maarten Vanneste

Norwegian Geotechnical Institute

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Badarinadh Vissapragada

Schlumberger Oilfield Services

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