Full Waveform Inversion: Where Are the Anisotropic Parameters Hiding?
|Instructor||Prof Tariq Alkhalifah, KAUST - Riyadh, Saudi Arabia|
|Book||Available in EAGE Bookshop|
The course starts by introducing the fundamentals of full waveform inversion (FWI) starting from it's basic definition. It soon focuses on the model update issues and provides analysis of it's probable success in converging to a plausible model. In the course we will discuss the many challenges we face in applying FWI on seismic data, and introduce modern day proposed solutions to these challenges. The focus of the course will be on FWI applied to anisotropic media. As a result, the course will also introduce anisotropy, its optimal parameterization and wavefield simulation in such media. Practical multi parameter inversion for anisotropic parameters requires an optimal FWI setup. We will discuss such a setup, which includes the proper parameterization of the medium and data access scheme necessary for a potential convergence to a plausible anisotropic model.
Upon completion of the course, participants will have a better understanding of:
- The scientific foundation behind Full waveform inversion
- The FWI challenges
- Wave propagation in Anisotropic media
- Anisotropy+Migration velocity analysis
I- Introduction to seismic inversion:
1. What is inversion?
2. What do we mean by full waveform inversion?
3. The Algorithm.
II- The elements of seismic waveform inversion:
1. Model and data.
2. The objective function.
3. The update.
4. The sensitivity kernel.
5. The nonlinear issue.
III- Seismic Anisotropy:
1. Definition and parameters.
2. The acoustic anisotropic wave equation.
3. Fundamental issues.
IV- FWI and anisotropy:
1. Multi-parameter inversion.
2. The right set of parameters.
3. The anisotropic sensitivity kernels.
4. Getting an initial model.
5. Anisotropy and MVA.
The course is designed for geophysicists, mathematicians and physicists working on problems related to seismic imaging of the Earth and building the necessary velocity models to do so.
Some knowledge on the physics of seismic wave propagation
About the instructor