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Patricia Takayama, Halliburton/ LandMark; FGEL/ UERJ (Brazil)
Paulo Menezes, T. L. , FGEL/ UERJ; PETROBRAS (Brazil)
Jandyr Travassos, M., MCT-Observatório Nacional (Brazil)
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Carbonate reservoirs account for 50% of the world's petroleum production. A major problem related to carbonates reservoirs is the heterogeneity of porosity and permeability systems. Heterogeneities that affect hydrocarbon production can occur at scales that are both sub-seismic and less than the typical development well spacing. Reservoir analogues studies can provide valuable definitions of geometric and petrophysical heterogeneities at these inter-well scales. Integration of ground-penetrating radar (GPR) surveys with sedimentological and stratigraphic data can provide information on the internal heterogeneities of sedimentary sequences. In the present work we present the interpretation of a 3D GPR dataset collected at a carbonate outcrop of the Coqueiro Seco Fm. (Sergipe Alagoas Basin) that are analogue to Campos Basin carbonates reservoirs (Lagoa Feia Fm.). The studied dataset was collected at 4 different stratigraphic levels. GPR data were interpreted through various geometric attributes such as coherence, azimute and dip. The use of the GPR attribute volumes allowed us to highlight key aspects of the sedimentary facies and observe features that were not evident in the standard images (amplitude volume). As main result we were able to identify three main stratigraphic facies: shale-carbonate intercalation, coquines and carbonates mounds.
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