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Near-surface seismic full waveform inversion - novel tools for obtaining high-resolution subsurface images

English title Near-surface seismic full waveform inversion - novel tools for obtaining high-resolution subsurface images
Applicant Maurer Hansruedi
Number 169107
Funding scheme Project funding
Research institution Institut für Geophysik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Geophysics
Start/End 01.07.2017 - 31.12.2021
Approved amount 255'053.00
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All Disciplines (3)

Discipline
Geophysics
Mathematics
Other disciplines of Physics

Keywords (4)

Tomography ; Numerical modeling ; Inversion ; Seismics

Lay Summary (German)

Lead
Prof. Dr. Hansruedi Maurer, Institute of Geophysics, ETH Zürich
Lay summary

Detaillierte Kenntnisse des untiefen Untergrunds (die obersten 100 bis 200 m) spielen eine wichtige Rolle für viele Probleme, die von hoher gesellschaftlicher Bedeutung sind (z.B. Hanginstabilitäten, Grundwasserprobleme, Geothermie und Wasserkraft, grössere Untertagebauten und Lagerung radioaktiver Abfälle). Um hochauflösende Untergrundbilder zu erhalten, werden im Rahmen von diesem Projekt neue geophysikalische Methoden entwickelt. Volle Wellenforminversion (engl. “full waveform inversion“ (FWI)) von seismischen Daten hat zurzeit das grösste Potential, um dieses Ziel zu erreichen, aber es sind methodologische Verbesserungen nötig, damit diese Technik für die Charakterisierung des untiefen Untergrunds eingesetzt werden kann. Insbesondere wird eine neuartige Modellparametrisierung des Untergrunds entwickelt werden, die es erlaubt, dem räumlich variablen Auflösungsverfahren von FWI Rechnung zu tragen. Damit werden die Resultate nicht nur stabiler, sondern der Rechenaufwand kann auch deutlich erniedrigt werden. Ein weiterer wichtiger Aspekt der methodischen Entwicklungen betrifft das optimierte Experimentdesign. Hier wird versucht, mit einem Minimum an Messpunkten ein Maximum an Untergrundinformation zu gewinnen. Erste Untersuchungen haben gezeigt, dass diesbezüglich substantielle Einsparungen bei der Datenaufnahme, sowie auch der Datenauswertung möglich sind. Die kombinierte Anwendung von optimierter Modellparameterisierung und Experimentdesign werden die Anwendbarkeit von FWI für untiefe Strukturen massiv erhöhen. Zurzeit werden vorwiegend 2D Untersuchungen entlang einzelner Profile durchgeführt. Mit den Neuentwicklungen werden in Zukunft auch 3D Charakterisierungen mit einem vertretbaren Aufwand machbar werden.

Direct link to Lay Summary Last update: 28.09.2016

Responsible applicant and co-applicants

Employees

Collaboration

Group / person Country
Types of collaboration
Seismology Group ETH Zurich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Swiss Seismological Service Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Karlsruhe Institute of Technology, Geophysics Group Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
University of Grenobles Alpes, Institute de la Science de la Terre France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Geophysics Group California State University Fresno United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Research Center Jülich Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
University of Leoben, Geophysics Group Austria (Europe)
- in-depth/constructive exchanges on approaches, methods or results

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
AGU-SEG Workshop on Near-Surface Imaging with Full Waveform Inversion Talk given at a conference 3D Compact Full Waveform Inversion with Gradient-constraint 21.09.2021 Virtual workshop, United States of America Xu Linan; Maurer Hansruedi;
Near Surface Geoscience Conference & Exhibition 2019 Talk given at a conference Compact Full Waveform Inversion by Model Space Re-Parameterization 10.09.2019 Rotterdam, Netherlands Maurer Hansruedi; Xu Linan;
Near Surface FWI Workshop Talk given at a conference Adaptive first-arrival traveltime tomography in a compact wavelet domain via sensitivity analysis 16.11.2017 Leoben, Austria Xu Linan; Maurer Hansruedi;


Associated projects

Number Title Start Funding scheme
153089 New Developments of efficient geophysical tomography algortithms for exploring near-surface structures 01.05.2014 Project funding

Abstract

To address urgent needs related with characterization of shallow subsurface structures (e.g., for natural hazards assessments, groundwater problems, geothermal and hydropower applications and studies related with nuclear waste repositories), it is proposed to develop novel technologies in the field of seismic full waveform inversions (FWI). This geophysical method has currently the largest potential for improving substantially the quality of subsurface images, and it has been applied recently with remarkable success in hydrocarbon exploration. However, near-surface applications include additional challenges that have not yet been addressed adequately. Therefore, several activities are proposed that will fill this knowledge gap. More specifically, an adaptive model parameterization technique will be implemented. This will not only help reducing the overall number of model parameters, thereby making the corresponding FWI problem computationally better tractable, but it will also improve the reliability of the inversion results. Furthermore, optimized experimental design techniques will be applied to near-surface FWI problems. It is expected that this will not only result in a considerably improved benefit/cost ratio, but the amount of data to be inverted will be also drastically reduced. This will make realistically large applications of near-surface FWI feasible. It is also anticipated to combine the adaptive model parameterization with experimental design for performing target-oriented (focused) experiments. Another extension of the current state-of-the-art includes appropriate consideration of anelastic damping. All these methodological improvements will be implemented for 2D FWI. In contrast to hydrocarbon applications, where comprehensive 3D surveys have become a standard procedure, logistical and economic constraints will make near-surface 2D surveys to be a viable option in a foreseeable future. To account for possible 3D (off-plane) effects that could negatively affect 2D investigations, we will explore the possibility of so-called pseudo-3D surveys, where 2D survey layouts are augmented with a sparse 3D distribution of additional sources and receivers. All these developments will be tested with synthetic data, but they will be also validated with field data sets.
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