TITLE: Inversion and Forward Modeling Approaches for Large Scale Geophysical 
       Electromagnetic Measurements  


SPEAKER:   Tarek Habashy


AFFILIATION:  Schlumberger Research


In this presentation we review a number of inversion and forward modeling approaches 
for large-scale geophysical electromagnetic applications arising in oil exploration, 
such as single-well logging measurements, surface-to-borehole, cross-well and surface EM. 
Much of the challenges associated with these types of applications are related to the 
large computational cost of the forward modeling and the inversion non-uniqueness inherent
 in the measurements. We will review efficient forward modeling algorithms specifically 
targeted to our applications and cover some of the regularization approaches that can 
help in narrowing down the class of solutions that have physical and practical usefulness. 
If time allows, we will also cover joint physics inversion for the integration of 
electromagnetic with seismic or pressure measurements.