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Workshop description

Due to its complexity and heterogeneity, the Earth’s near-surface zone (upper 10’s – 100’s of m) has a significant impact on seismic data recorded on the land surface or the seabed. This includes signal distortions caused by irregular time delays, scattering and absorption in the near-surface zone (and consequent loss of high frequency information), generation of coherent surface-related noise (e.g., ground roll, guided waves), and signal amplitude and phase changes due to rapid lateral near-surface variations. Furthermore, near-surface properties and their effects on exploration-scale seismic data vary significantly between different areas of the world (e.g., karstified rocks, desert areas, thick glacial sediments, permafrost, seabed). Being able to remove or correct for the distortions caused by the near- surface zone is clearly a goal of the highest priority to the exploration-seismic industry. Yet, the near-surface zone is often only poorly characterized and understood.
The goal of this workshop is to review recent advances in techniques to characterize the near-surface zone, to build near-surface models, and to use near-surface models to correct for distortions or to, for example, detect shallow hazards. Thereby, the potential benefits, applications and limitations of seismic methods (e.g., surface-wave inversion, full-waveform inversion, interferometry) as well as non-seismic methods (e.g., electromagnetic techniques, geoelectrics, gravity, satellite imagery, airborne geophysics) will be addressed. The workshop seeks to bridge the gap between the oil and gas (O&G) and the near-surface geophysics (NSG) community through an exchange of ideas, approaches and experiences in the different fields.
 

Workshop format

Invited keynote speakers will cover the recent advances of techniques both in the field of NSG and O&G exploration. Additionally, oral and poster presentations of technical developments, case studies, and applications in different fields are welcome. Ample time for discussion will be given to allow for the exchange of knowledge and experiences.
 

Who should attend?

The workshop will be of interest to geophysicists, geologists and engineers working with seismic and other geophysical methods for near surface and deep exploration. 
 

Programme

Session Introduction, Acquisition-related Issues & Full Waveform Inversion
09:30 Introduction - The Near-surface Zone & Related Imaging Challenges
09:40

WS11-A01 The Sensitivity of a Seismic Sweep to the Near Surface

W. Kimman* (Meridian Seismic Science)

10:05

WS11-A02 Early-arrival FWI - Potential for the Near-surface

F. Bleibinhaus* (Mining University Leoben)

10:30

WS11-A03 Reliable Statics Solutions in Complex Near-Surface Areas

F. Rost* (DMT Petrologic GmbH)

10:55 Discussion session
11:10 Coffee break
Session Surface Waves and Ambient Noise - Signal and Noise
11:40

WS11-B01 Noise-based Seismic Tomography at the Valhall Oil Field with Using Scholte and Love Waves

G. Tomar* (Institut de Physique du Globe de Paris), N.M. Shapiro (Institut de Physique du Globe de Paris), A. Mordret (MIT), S. Singh (Institut de Physique du Globe de Paris) & J.P. Montagner (Institut de Physique du Globe de Paris)

12:05

WS11-B02 A Cascaded Approach to Surface Wave Noise Attenuation

P.J. Bilsby* (Schlumberger)

12:30 Discussion session
12:45 Lunch break
Session Near-Surface Characterization - Multi-Method Studies and Joint Inversion
14:00

WS11-C01 Understanding the Impact of Karst on Seismic Wave Propagation - A Multi-method Geophysical Study

C. Schmelzbach* (ETH Zurich), C. Jordi (ETH Zurich), D. Sollberger (ETH Zurich), J. Doetsch (ETH Zurich), M. Kaufmann (ETH Zurich), W.Y. Meijer (ETH Zurich), E. Manukyan (ETH Zurich), J. Robertsson (ETH Zurich), H. Maurer (ETH Zurich), S. Greenhalgh (ETH Zurich) & H. Horstmeyer (ETH Zurich)

14:25

WS11-C02 Quantitative Integration of Measurements in Near Surface Characterization

M. Mantovani* (Schlumberger)

14:50 Discussion session
15:05 Coffee break
15:30 Open Discussion - State-of-the-art, Challenges and Future Directions
16:45 Wrap-up and closing