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Speaker: Brian Russell, CGG GeoSoftware
Geophysicists are trained to conceptualize geophysical problems in detail. However, machine learning algorithms are more difficult to understand and are often thought of as simply “black boxes”. In this talk, I will start with a numerical example to illustrate the difference between geophysical and machine learning inversion. I will show that, like inverse geophysical solutions, machine learning algorithms have a definite mathematical structure that can be written down and understood. The example used in this study is the extraction of the reflection coefficients from a synthetic created by convolving a dipole reflectivity with a symmetric wavelet, and discusses the topics of deconvolution, recursive inversion, linear regression and nonlinear regression using three different types of neural networks. I will then extend these methods to two real data examples, first performing post-stack seismic inversion and then predicting density from multiple seismic attributes. The results suggest that we need to use a judicious combination of both machine learning and geophysics-based inversion methods.
Speaker Biography: Brian Russell, CGG GeoSoftware
Brian Russell holds a B.Sc. (Hons.) from the University of Saskatchewan (1975), a M.Sc. from Durham University (1978), and a Ph.D. from the University of Calgary (2004), all in geophysics. He joined Chevron in Calgary as an exploration geophysicist in 1975 and subsequently worked for Teknica Resources and Veritas Seismic before co-founding Hampson-Russell Software with Dan Hampson in 1987. HampsonRussell is now a fully owned subsidiary of CGG, where Brian is Vice President, GeoSoftware.
Brian is involved in the research of new AVO, rock physics, inversion and machine learning techniques as well as giving presentations on seismic theory and software throughout the world, currently via on-line platforms! He is a Past-President of both the SEG and CSEG and has received Honorary Membership from both societies, as well as the Cecil Green Enterprise Award from SEG (jointly with Dan Hampson) and the 1999 CSEG Medal.
Brian is an Adjunct Professor in the Department of Geoscience at the University of Calgary and is registered as a Professional Geophysicist (P.Geoph.) in Alberta. He is also currently on the board of the M.Sc. in Integrated Petroleum Geosciences (IPG) at the University of Alberta.
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