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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/10161918065
An approach to reduce exploration risk using spectral decomposition, prestack inversion, and
seismic
facies classification
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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 decomposition, 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 decomposition 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 decomposition optimization approach is critical for accurate target zone representation as well as selection of the appropriate transform. Prestack inversion, spectral decomposition, 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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