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  Evaluating 3D models from potential fields data across oil producing blocks in pre-salt campos basin, Brazil

La Terra, E., Fontes, S. L., Meju, M. A., Alberti, R. A., Bueno, G. V., Pereira, J. A., Tupinamba, M. A., Hashim, A. A. (2023): Evaluating 3D models from potential fields data across oil producing blocks in pre-salt campos basin, Brazil, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1211

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017380 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017380_2
Genre: Conference Paper

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La Terra, Emanuele1, Author
Fontes, Sergio L.1, Author
Meju, Maxi A.1, Author
Alberti, Rodrigo A.1, Author
Bueno, Gilmar V.1, Author
Pereira, José A.1, Author
Tupinamba, Miguel A.1, Author
Hashim, Ali A.1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Three-dimensional potential fields models are being tested in the Brazilian pre-salt region of the Campos Basin, where a noticeable magnetic anomaly with oval outline was identified. The study area is relevant for tests, as 3 abandoned pioneer wells with depths varying between 5500 and 7100m were re-drilled and marked the presence of oil, one of which is a commercial producer. These wells cut through several sedimentary formations of the basin, including shales with intercalations of carbonates and sandstones. Thick layers of salt were crossed, and intercalations of volcanic and carbonates are present below the salt. Oil samples were identified at the top of a volcanic sheet at 7100m depth. Some 3D inversion models of both the magnetic susceptibility distribution and density contrast fit the observed data. To reduce the non-uniqueness of potential field models, inversions were constrained by well logs, geological and other existing geophysical data. Several parameters were considered during the inversion procedure including cell dimensions, data quantity, reference models, assigned uncertainties, depth weighting, wavelet compression of sensitivity matrix, choice of regularization parameter. A Multiphysics approach was found to facilitate the selection of the best models. The results evidenced anomalies of density and magnetic susceptibility associated with the volcanic rocks that display variations laterally and in depth and satisfactorily explains the oval magnetic anomaly.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1211
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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