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Abstract

AAPG Bulletin, V. 104, No. 5 (May 2020), P. 1075-1090.

Copyright ©2020. The American Association of Petroleum Geologists. All rights reserved.

DOI: 10.1306/10161918065

An approach to reduce exploration risk using spectral Previous HitdecompositionNext Hit, prestack inversion, and seismic facies classification

Carlos Jesus,1 Wagner Moreira Lupinacci,2 Patricia Takayama,3 Joana Almeida,4 and Danilo Jotta Ariza Ferreira5

1Grupo de Interpretação Exploratória e Caracterização de Reservatórios (GIECAR), Department of Geology and Geophysics, Universidade Federal Fluminense (UFF), Niterói, Rio de Janeiro, Brazil; Petrogal Brasil, Rio De Janeiro, Brazil; [email protected]
2GIECAR, Department of Geology and Geophysics, Niterói, Rio de Janeiro, UFF; Biomass and Water Management Research, UFF, Niterói, Rio de Janeiro, Brazil; [email protected]
3Petrogal Brasil, Rio De Janeiro, Brazil; [email protected]
4Galp Energia, Lisbon, Portugal; [email protected]
5GIECAR, Department of Geology and Geophysics, UFF, Niterói, Rio de Janeiro, Brazil; Schlumberger, Rio de Janeiro, Brazil;[email protected]

ABSTRACT

Petroleum companies have invested heavily in the exploration of frontier offshore basins in Brazil. Uncertainties associated with geologic complexity, lithostratigraphy, fluid content, and seismic resolution in these basins are the most common challenges. Many methods have been used to circumvent these issues, such as assessing seismic attributes, seismic inversion, spectral Previous HitdecompositionNext Hit, and the integration of these methodologies to accomplish an optimal approach. Because of the complex geology of these areas, it is very difficult to identify potential reservoirs within one specific geologic formation. Hence, applying spectral Previous HitdecompositionNext Hit to frontier basins of high geologic complexity can help overcome the challenges because in the frequency domain, it is possible to better define variability and lateral discontinuities. The correct choice of the spectral Previous HitdecompositionNext Hit optimization approach is critical for accurate target zone representation as well as selection of the appropriate transform. Prestack inversion, spectral Previous HitdecompositionTop, and attribute seismic facies classification were applied to evaluate the extent of a reservoir and analyze whether an appraisal well has been sited at a good location. The results showed that the new appraisal well was planned at a good location but that its facies were not as good as those of the first discovery well, as confirmed after drilling.

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