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Presented By: Alexander Mihai Popovici, CEO, Z-Terra Inc.
The Z-Terra implementation of wide azimuth Beam Tomography is based on the Fast Beam Migration (FBM) algorithm. The Beam Tomography uses FBM to directly output a set of image points (x,y,z) with velocity update values, which bypasses the time consuming steps required for traditional tomography, including preparing the gathers for semblance analysis, semblance picking and back-projection picks QC. A 2000 sq km velocity model can be updated using 400 CPUs in less than 5 minutes. The Beam Tomography output contains image point azimuth information and this allows the tomographic update to go beyond the current limitation of limited wide azimuth velocity updates.
Beam Tomography allows for faster turnaround time for large 3-D seismic projects and at the same time increases the accuracy of the velocity model by using wide azimuth information that is typically unavailable in traditional tomography. Beam Tomography can be combined with Full Waveform Inversion (FWI) to speed up the convergence and obtain high resolution velocity models 10 to 100 times faster than the standard practice. While FWI is typically implemented in data space, FWI can also be implemented in image space, without the long offset and low frequency constraints of FWI in data space.
Figure 1. (Left) Gaussian Beam Migration depth slice. (Right) Beam Tomography velocity model corresponding to the stack on the left. Notice the resolution of the velocity model in the channels.
Figure 2. (Left) Beam Tomography velocity update. (Right) Beam Tomography on top of migrated stack. Notice the velocity update conforms to the geology structure.
1. Short Review of Migration Velocity Analysis and Tomography and historical overview of development:
- Single parameter update, multiple parameter update, Extended Gathers, Beam Tomography, FWI.
- Horizon, grid based, hybrid.
- Latest features implemented, stability and graphic interface.
2. Short Review of Beam Forming and Beam Migration:
- Data Decomposition via Beam Forming.
- Migration and Image Reconstruction.
- Fast Beam Migration implementation and examples.
- Gaussian Beam Migration implementation and examples.
3. Beam Tomography (BT) Implementation.
- BT as FWI in image domain vs. FWI in data domain.
- Latest features implemented and graphic interface.
- Case histories around the world.
Presenter Biography: Alexander Mihai Popovici, CEO Z-Terra Inc.
Alexander Mihai Popovici is Chief Executive Officer and Chairman at Z-Terra Inc., a provider of state-of-the-art geophysical and geological technology, services and software for the upstream oil and gas industry. He holds Ph.D. (1995) and M.Sc. (1991) degrees in geophysics from Stanford University, and an equivalent B.S. (1986) in geophysical and geological engineering from University of Bucharest, Romania. He escaped from Romania in 1986 and spent a year in a refugee camp in Austria. Dr. Popovici was co-founder and CEO of 3DGeo Inc. He is the Honorary Consul of Romania in Houston.
He has ten patents in the field, more than 100 publications in conference proceedings, books, trade journals, and research reports and has given numerous invited talks at conferences, geophysical associations, and geophysical workshops. He has been a member of the SEG Research Committee, served as Associate Editor (Seismic Migration) for Geophysics, and is past Chairman and founding board member of Geoscientists Without Borders, an SEG Foundation program that funds humanitarian applications of geophysics around the world. He was the 2017 SEG Houston Technical Program Chairman and served on the SEG Board as Vice President from 2017 to 2019.
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