First EAGE Conference on Seismic Inversion
26-29 October 2020 | Online Event
Lunch and Learn Session:
Non-Linearity in Acoustical Imaging
Hosted by: Dries Gisolf (Delft Inversion)
Tuesday 27 October 2020 at 12:00 noon CET (UTC+1)
Introduction
Talking about non-linearity in acoustical imaging, we first have to define what is non-linear with what. In acoustical imaging we are dealing with sources, wave-fields and media properties. Together they define the acoustic, or elastic, wave-equation that governs all acoustical imaging applications. We think here of ultra-sonic medical imaging and non-destructive testing and seismic imaging. The first is based on acoustics, whereas the latter two are full elastic.
However, in this presentation we will use the term acoustical imaging to cover all these applications. We will discuss two types of non-linearity encountered in acoustical imaging. First we see that in some types of imaging, particularly in medical acoustical imaging, the wave-field can be non-linear in the sources. We call this non-linear propagation. The other type of non-linearity is the non-linear relationship between the wave-field and the media properties. Both these types of non-linearity can lead to resolution improvement in the images, but in very different ways. In this talk the above subjects are presented and examples are given.
Agenda
- Definition of the different types of non-linearity discussed in this presentation
- Non-linear propagation (wave-fields non-linear in sources)
- Non-linearity between wave-fields and properties
- Short treatise on non-linear propagation, with examples
- From medical imaging
- From seismic imaging
- Observable physical phenomena caused by non-linear propagation
- Higher harmonics
- Local heating
- Observable physical phenomena caused by non-linearty between wave-fields and properties (internal multiple scattering and transmission effects)
- In terms of the wave-equation
- In terms of the reflectivity method (Zoeppritz, Kennett)
- Resolution improvement
- Temporal, from non-linear propagation (higher harmonics)
- Spatial, from non-linear relationship between wave-fields and properties
- Examples
- Discussion
Meet the Instructor
Dries Gisolf graduated from the Technical University Delft in 1971. In 1975 he obtained a PhD in the Faculty of Mathematics and Natural Sciences of the University of Utrecht. In 1976 he joined Shell International Research in Rijswijk, The Netherlands. Between 1980 and 2000 he held various positions for Shell in Oman, The Netherlands, Australia, Malaysia and Nigeria. In September 2000 he was appointed Professor of Acoustical Imaging and Sound Control at the Faculty of Applied Sciences of Delft University. After his retirement from Delft University he developed a wave-equation-based AVO algorithm, as part of the Delphi Consortium. In 2013 he co-founded Delft Inversion
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