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3D Simultaneous Elastic Inversion from BroadSeis® Data - A Case Study from AngolaGold Open Access

Authors: L. Goncalves-Ferreira, Y. Arroub, F. Piriac, D. Pandolfi, J.-L. Formento, X. Carriere, J.-P. Coulon and T. Al-Romani
Event name: First EAGE/ASGA Petroleum Exploration Workshop
Session: Seismic Processing I
Publication date: 02 October 2017
DOI: 10.3997/2214-4609.201702347
Organisations: EAGE
Language: English
Info: Abstract, PDF ( 391.49Kb )

Summary:
Broadband acquisition and dedicated processing can be regarded as one of the most recent innovations in Geophysics. The benefits of a new dataset acquired using broadband technology, BroadSeis®, and the 3D elastic inversion results are used to determine robust high-resolution estimates for P-impedance and Poisson’s Ratio volumes leading to a more reliable reservoir characterization. In this study we show the impact of broadband in key stages of the reservoir characterisation workflow (inversion and pseudo-Vclay estimation), for a more quantitative reservoir interpretation. The main challenges of the area, located deep offshore Angola in the Miocene interval, are the structural complexity associated to salt proximity and steep dips at the flanks of the structure. Key steps of this elastic inversion were the multi-well-driven deterministic wavelet extraction and the accurate velocity model derived from FWI that allowed enhancing the a-priori model building. This method enables better delineation of the sand bodies’ architecture, resulting in an updated geomodel structural grid and reliable litho-seismic attributes for future development well targeting. We conclude that pseudo-Vclay on BroadSeis® shows more lateral discontinuity (heterogeneity) than on conventional data, as confirmed by recent well analysis. The pseudo-Vclay on BroadSeis® has also confirmed sand quality, as proved by wells results.

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