Full Wavefield Technology

Our industry is in demand of imaging results beyond today’s resolution limits in order to progress in the next decades. We believe that exploiting all complex propagation effects in the seismic data is an important way to achieve this ambitious goal. This means the end of ‘linear’ imaging methods, based on primaries only, and that multiple reflections, transmission effects and wave conversion are the key components of retrieving detailed, reliable information on both complex subsurface structures and the reservoir area.

Currently, Full Waveform Inversion (FWI) concepts – based on directly solving the two-way wave equation – is very promising methodology, however also a highly nonlinear method, prone to local minima. Furthermore, the output of FWI – being the velocity model – is often used in traditional migration procedures, losing all the benefits of exploiting the full wavefield.

Therefore, in addition to such solutions, within Delphi we propose the Full Wavefield Migration (FWM) approach, which combines the best of imaging and inversion methods and exploits all higher-order scattering effects in one integrated framework.
Extending this concept, Joint Migration Inversion (JMI) also includes the estimation of the background velocity model. Because our inversion parameters – being propagation velocity and reflectivity – connect more directly to the observed data (being arrival time and amplitude), we aim at reducing the non-linearity of the inversion problem.

Furthermore, FWM and JMI are very much suited for application in a time-lapse fashion, where all vintages of seismic data are inverted simultaneously in order to obtain detailed, dynamic properties of the reservoir, taking into account geologic scenario information.
Finally, the FWM and JMI framework allows to provide high-resolution input to reservoir characterization and beyond, as all information on the elastic reflection properties are fully maintained.

Joining the Consortium

Today, the Delphi consortium is financially supported by approximately 30 companies, distributed over three projects. We meet twice a year, once in Europe (The Hague) and once in the US (Houston). In addition, we communicate with our sponsors via our protected FTP. New solutions are transferred to the sponsors by means of software releases.

We invite geo-energy companies - who have not yet joined our consortium - to become a member of the Delphi family. The consortium does not only develop new solutions for urgent industry problems, it also gives the sponsors an exposure to a large group of talented students. Today, Delphi graduates are working in the offices of the Delphi sponsors worldwide.

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