The Use of Surface Waves for Near Surface Velocity Model Building
|Dr Laura Valentina Socco (Politecnico di Torino, Italy)|
|Near Surface – Non-Seismic Methods|
|5 CPD points|
2D 3D ALGORITHM DISPERSION INVERSION PASSIVE SAMPLING SHEAR WAVE SPECTRAL ANALYSIS WAVE PROPAGATION
The use of surface wave analysis for near-surface characterization has dramatically increased in the last decade thanks to the possibility offered by this technique for shear wave velocity estimation. New tools and approaches have been developed for surface wave data acquisition and analysis to make the method robust and suitable to complex systems. The course will supply an overview of the method starting from surface wave propagation and dealing with acquisition, processing and inversion of surface wave data. Advantages and weaknesses of different approaches as well as requirements for data acquisition and analysis will be discussed. Recent developments will be presented with example of results and applications to different near-surface problems.
The course will provide the participants with a wide overview of the main steps of the surface wave method: acquisition, processing and inversion. Different approaches with their potentialities and limitations will be discussed through many practical examples to enable the participants to acquire knowledge about the requirements and design of data acquisition, processing methods and inversion algorithms for different applications from small-scale engineering problems towards large-scale exploration.
- Surface wave propagation in homogeneous and layered media;
- Geometrical dispersion, modal curves and their properties;
- The use of surface wave for near surface characterisation: the method outline;
- Data acquisition: on purpose acquired active data, other active data, passive data;
- Processing: from raw data to dispersion curves;
- Inversion: stochastic methods, linearized methods (1D, pseudo-2d/3D), higher modes
- The final results: resolution and uncertainties
- The requirements for acquisition, processing and inversion.
Near-surface geophysicists and exploration geophysicists interested in near-surface velocity models.
Participants should have basic knowledge of sampling principles, spectral analysis and inversion of seismic data.
About the instructor
Laura Valentina Socco (1966), is presently Assistant Professor in Applied Geophysics at the Politecnico di Torino (Technical University of Turin), where she took her PhD. Her research work is focused on near surface problems with particular attention to surface wave methods. She is author of about 60 scientific publications in the field of Applied Geophysics in international and national journals and in the proceedings of national and international scientific conferences. She is member of EAGE Research Committee and Educational Committee and is Associate Editor of “Geophysics” and “Near Surface Geophysics”. She is vice-director of the Doctorate School of the Politecnico di Torino.
She teaches Applied Geophysics for Petroleum Engineering at Politecnico di Torino and Geophysical Prospecting at University of Turin. She has been member of the High Quality Laboratory DIPLAB (Disaster Planning Laboratory), of Politecnico di Torino since 2002. She is principal investigator for many research projects financed by national and international institutions and by private and public companies.
Convenor of the workshop on “Surface Wave Methods for near surface characterisation”, EAGE (Stavanger 2003), she has been designated Guest Editor of a special issue of “Near Surface Geophysics” which was published in 2004.
Explore other courses under this discipline:
Instructor: Dr Asbjørn Nørlund Christensen (Nordic Geoscience)
In the past fifteen years airborne gravity gradiometry (AGG) has gained acceptance as a cost effective exploration tool in a variety of minerals and petroleum exploration programs. This one-day course is intended for all explorers considering using AGG in their exploration efforts.
Instructor: Dr Yaoguo Li (Colorado School of Mines)
Gravity and magnetic data are among the oldest geophysical data acquired for the purpose of resource exploration and exploitation. They currently also have the widest areal coverage on the Earth, span a great range of scales, and play important roles in mineral, energy, and groundwater arenas. This course will focus on the methodology, numerical computation, solution strategy, and applications of 3D physical property inversions of gravity and magnetic data sets. The course is designed to have two tracks in order to meet the different needs of EAGE community in mineral exploration and in oil & gas exploration and production. We achieve this by dividing the course into two parts, and cover the methodologies common in potential-field methods in Part-I and discuss tools and applications specific to mineral exploration or oil & gas reservoir monitoring in Part-II.
Instructor: Dr Bruce Hobbs (Petroleum Geo-Services)
Following a brief summary of electromagnetic methods for exploration, the theoretical basis of the new MTEM method is presented together with practical methods of data acquisition and processing. Modelling and inversion for this new method are described and land and marine case studies are presented.
Instructor: Dr Alessandro Ferretti (Tele-Rilevamento Europa (TRE))
Satellite radar data for surface deformation monitoring are gaining increasing attention, and not only within the oil and gas community. They provide a powerful tool for remotely measuring extremely small surface displacements over large areas and long periods of time, without requiring the installation of in-situ equipment. However, apart from remote sensing and radar specialists, only a relatively small number of geoscientists and engineers understand how a radar sensor orbiting the Earth at about 7 km/s from 700km above the Earth's surface can actually measure ground displacements of a fraction of a centimetre. This course provides a step-by-step introduction to satellite radar sensors, SAR imagery, SAR interferometry and advanced InSAR techniques. Rather than a tutorial for remote sensing specialists, the course starts from very basic concepts and explain in plain language the most important ideas related to SAR data processing and why geoscientists and engineers should take a vested interest in this new information source.
Instructor: Dr Laura Valentina Socco (Politecnico di Torino)
The use of surface wave analysis for near surface characterisation has dramatically increased in the last decade thanks to the possibility offered by this technique for shear wave velocity estimation. New tools and approaches have been developed for surface wave data acquisition and analysis to make the method robust and suitable to complex systems.