Schlumberger

Technical Paper: Elastic Full-Waveform Inversion Using 4C Data Acquisition

Society: SEG
Paper Number: 2012-482
Presentation Date: 2012
 

Abstract

In the last four years there have been several attempts to execute full-waveform inversion (FWI) on 3D data sets. As field data or part of the data component is dominated with P waves, one feasible approach is to use acoustic approximation. This approach of FWI determines parameters related to the acoustic wave equation but mainly updates the velocities by minimizing the misfit between the observed data and the model data. The approach has shown tremendous potential especially in 3D wide-offset acquisitions using the pressure component of the collected data. This includes wide-azimuth streamer, ocean-bottom surveys and land types of geometries where the advantage of FWI has convinced the oil industry to pay close attention to the technology. The question still remains of how far can we properly describe the field data with the acoustic approximation, and at what point do we need to switch over to the much more expensive elastic wave equation implementation. If we acquire multi-component (4C) data, then we may be able to take advantage of the extra measured wavefields using elastic FWI. We previously demonstrated the application through synthetic data of which an example is an overthrust model and have also shown the uplift in a real data from the Gulf of Mexico (GOM).

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