Otros datos relevantes
PREMIOS, HONORES Y TÍTULOS
Vitrinite Reflectance ( Ro% )
Figure 8. Plot of time-depth index of some reservoirs of the Brazilian continental margin against vitrinite reflectance in the associated shales.
Figure 9. Plot of porosity (average and maximum) against time-depth index for Type I reservoirs.
Broken lines enclose average porosity values. AL = Alagoas Basin; ES = Espírito Santo/Cumuruxatiba basins; F = feldspar; L = lithic fragments; Q = quartz.
TYPE I
Table 2. Exponential Regressions of Porosity (%) on Time-Depth Index (km ×Ma) for Reservoir Types I, II, and III.*
Reservoir Type b a n r2(%)
I 3.07 –4.79E–3 8 84.7
II 3.34 –3.08E–3 21 82.2
III 3.46 –1.92E–3 8 82.9
*Porosity (%) = exp (b + a TDI); n = number of points in data set.
variables listed above and influential on the rheologi-cal behavior. For instance, Type II or Type III reser-voirs have a higher quartz content, and subsequently a low content of lithic (ductile) rock fragments. As a result, the compaction trend shows less porosity reduction. This compositional control dominates because the thermal regimes and burial histories are very similar.
CONCLUSIONS
Burial history plays a very important role in the evo-lution of sandstone porosity along the Brazilian conti-nental margin, in addition to detrital composition and texture. Reservoirs that have resided at maximum burial longer tend to be less porous than the ones that achieved maximum burial late in their burial history, indicating time is a factor in porosity destruction. The more miner-alogically and texturally mature sandstones lose poros-ity at a slower rate than the immature ones during progressive burial. The decay in porosity is poorly related to the present-day depth of the sandstone reser-voirs, but it is closely related to the evolution of depth during burial. Good relationships were obtained between porosity and TDI, a parameter that reflects the evolution of reservoir depth over geologic time.
Porosity prediction of a sandstone reservoir along the Brazilian continental margin is possible with informa-tion about its mineralogy, texture, and burial history.
Exceptions observed were sandstones that contained early chlorite coatings, which preserved porosity. The ranges of detrital composition, texture, age, depth, tem-perature, and burial history of these sandstones should be considered when making porosity predictions.
ACKNOWLEDGMENTS
We thank AAPG reviewers M. Emery and J.
Schmoker. We thank J. Gluyas, S. Bloch, and Carlos H.
L. Bruhn for suggestions and discussions. We also thank Sylvia Anjos, Luis F. De Ros, and Roge´rio Schiffer de Souza for exchanging ideas. We thank PETROBRÁS for granting permission to publish this paper.
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