1887

Abstract

Summary

Barremian lacustrine carbonates, essentially coquinas, are the reservoir rocks of the large pre-salt petroleum findings in deep to ultra--deep waters of Santos, Campos and Espirito Santo basins. The complicated geological setting of those discoveries, with the massive overburden of salt bodies, makes the seismic imaging of the carbonate reservoirs an expensive and challenging matter. In this setting, accurate facies models are a demand for the predictability of the carbonate reservoir intervals.

This work shows an analogue high-resolution coquinas facies model based on an interpretation of a pseudo--3--D Ground Penetrating Radar (GPR) survey. We rely not only on the trace amplitude analysis but mainly on trace attributes to diminish the ambiguity of the interpretation due to potential visual biases. We have used the dip and texture attributes to help us better understand the subsurface and to focus on the main stratigraphic features of the reservoir analogue. Then we have produced a joint interpretation, based on three trace attributes: i.e., amplitude, dip and texture to highlight the main radar facies. That resulted in a facies model in which three SW-NE striking coquina bars (reservoir facies), correlated with transgressive systems tract (TST) interbedded with shales (nonreservoir facies) of highstand systems tract (HST), are identified.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201600696
2016-05-30
2024-03-29
Loading full text...

Full text loading...

References

  1. Azambuja Filho, N.C., L.M.Arienti, and M.R.Mello
    [1998] Sedimentological and Geo- chemical evidence of high frequency climatic cycles controlling the deposition of source and reservoir rocks in a Lower Cretaceous rift lake, Sergipe-Alagoas Basin, Brazil. 1998 AAPG Annual Convention and Exhibition.
    [Google Scholar]
  2. Kinoshita, E.M.
    [2010] Modelagem sismica-geometrica de facies dos carbonatos lacustres da Formacao Morro dos Chaves, Bacia de Sergie-Alagoas. Boletim Geociencias Petrobas, 18.
    [Google Scholar]
  3. Menezes Travassos, J. and P.T.Luiz Menezes
    [2004] GPR exploration for groundwater in a crystalline rock terrain. Journal of applied geophysics, 55, 239–248.
    [Google Scholar]
  4. Nascimento, T.M., P.T.L.Menezes, and I.L.Braga
    [2014] High-resolution acoustic impedance inversion to characterize turbidites at Marlim Field, Campos Basin, Brazil. Interpretation, 2, T143–T153.
    [Google Scholar]
  5. Qayyum, F. and P.de Groot
    [2012] Seismic dips help unlock reservoirs. American Oil & Gas Reporter, 75–79.
    [Google Scholar]
  6. Takayama, P., P.T.L.Menezes, and J.M.Travassos
    [2009] 3D GPR modeling of carbonates reservoir analogues applying geometric attributes: Coqueiro Seco Formation, Sergipe- Alagoas Basin–Brazil. 11th International Congress of the Brazilian Geophysical Society.
    [Google Scholar]
  7. Thompson, D.L., J.D.Stilwell, and M.Hall
    [2015] Lacustrine carbonate reservoirs from Early Cretaceous rift lakes of Western Gondwana: Pre-Salt coquinas of Brazil and West Africa.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201600696
Loading
/content/papers/10.3997/2214-4609.201600696
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error