Seismic reservoir monitoring and production optimization (4D seismic workflows)

We are happy to announce our first event of 2024🎉. 

Are you ready to join us for an exciting evening on 1st February, at Spor 5 venue?

Agenda

18:30-19:00 Doors open and welcoming 

19:00-19:30 Tech talk "Seismic reservoir monitoring and production optimization, 4D seismic workflows" by Victor Aarre Madsen 

19:30-21:00 Networking

The bar at the venue will be open to purchase drinks!

Key speaker bio Victor Aarre Madsen has worked for nearly 30 years in various Research & Engineering positions at SLB, mainly within the seismic discipline. He is well renowned for his contributions to the Petrel E&P software platform and he holds 14 granted US patents for some of the science inside it. In the early days, Victor focused on shear-wave anisotropic velocity model building and imaging, before he moved on to reservoir characterization and time-lapse seismic monitoring. Seismic attributes are a speciality. In 2023 Victor left SLB and now works as a consultant. 

Talk abstract Hydrocarbon reservoir pressure and saturation changes during production or injection induce stress and strain alterations in and around the reservoir. These changes have been shown to also cause anisotropic velocity variations. Vertical time-shifts, indicating seismic wave travel-time changes, can be accurately quantified between seismic vintages. Yet, recent observations reveal significant lateral shifts in producing reservoirs, alongside vertical shifts, influenced by various mechanisms. Aarre (2008) demonstrated that 4D velocity changes explain the magnitude and direction of the lateral shifts. Notably, 3D warping based on the estimated shift vector corrects for 4D velocity/stress changes in monitor seismic migration. The key implication is that estimating 4D time-shifts along the surface tangent, accounting for structural dip, yields a less noisy and more accurate field. This precision is crucial for calculating time-strain, as structural dips can leak into the time-shift vector. Using the South Arne chalk field as a case study, we present observations of lateral and vertical shifts, convert 3D shift vectors to tangential time-shifts, compare them to conventional vertical time-shifts, and demonstrate the improved mapping's significance for reservoir understanding.

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Sincerely,

EAGE Local Chapter Stavanger.

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