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Re-Imaging of 2D Acquisition in Brazil’s Equatorial Margin via Pseudo-3D Model Building
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 86th EAGE Annual Conference & Exhibition, Jun 2025, Volume 2025, p.1 - 5
Abstract
Summary
Recent major discoveries in the deep-water areas of the Guyana and Tano basins have raised the interest in their neighbour the Brazilian Equatorial Margin (BEM). The BEM is a region that encompasses five distinct basins with a wide range of geological characteristics. To understand the geological features of the area, only regional 2D seismic data is available. 2D acquisitions have limited seismic illumination usually acquired on sparse grid, typified by being processed in a line-by-line basis. This work merged 312 2D lines to create a single uniform pseudo 3D Earth model reducing mis-ties between intersecting lines. Additionally, the long wavelength Earth model was better resolved by building and updating the model simultaneously using all lines. The use of a pseudo-3D model also helped to understand the geology on a larger scale, highlighting areas of high impedance contrast like carbonate layers, gas packets, and volcanic intrusions present in the area. This abstract shows a BEM case history outlining the details of obtaining this pseudo-3D model building via iterative updates through pseudo-3D tomography loops and full-waveform inversion. The final model reduces drilling uncertainty by showing improved well ties, improved intersecting line ties, and greater fidelity and resolution across all four 2D surveys.
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