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Dickite in shallow oil reservoirs from Recôncavo Basin, Brazil: diagenetic implications for basin evolution

Published online by Cambridge University Press:  09 July 2018

J. De Bona ,
N. Dani ,
J. M. Ketzer  and
L. F. De Ros
J. De Bona
Affiliation:
Institute of Geosciences, Federal University of Rio Grande do Sul, UFRGS, Porto Alegre, RS, Brazil
N. Dani
Affiliation:
Institute of Geosciences, Federal University of Rio Grande do Sul, UFRGS, Porto Alegre, RS, Brazil
J. M. Ketzer
Affiliation:
Pontifical Catholic University of Rio Grande do Sul, PUC-RS, Porto Alegre, RS, Brazil
L. F. De Ros*
Affiliation:
Institute of Geosciences, Federal University of Rio Grande do Sul, UFRGS, Porto Alegre, RS, Brazil
*
*E-mail: lfderos@inf.ufrgs.br
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Abstract

Fluvial and aeolian sandstones of the Sergi Formation are the most important reservoirs of the Recôncavo Basin, Brazil. Optical and scanning electron microscopy, X-ray diffraction and infrared spectroscopy revealed the occurrence of dickite, a clay mineral indicative of deep burial conditions (T >100ºC), in the shallow Buracica (630–870 m) and Água Grande (1300–1530 m) oilfields. Vermicular dickite replaces K-feldspar and plagioclase grains, and fills intra- and inter-granular pores. Its vermicular habit is a product of pseudomorphic kaolinite transformation during burial. The presence of dickite is in accordance with the intensity of compaction, post-compactional quartz cementation and δ18O values of calcite cements (T up to 109ºC). These petrological features of deep burial, as well as apatite fission-track analyses, indicate that uplift and erosion of at least 1 km, and probably >1500 m, affected the central part of the Recôncavo Basin and possibly the entire region. This uplift has not been detected previously by conventional structural and stratigraphic models.

Keywords

diagenesissandstonesreservoirsdickiteupliftRecôncavo BasinBrazil
Type
Research Article
Information
Clay Minerals , Volume 43 , Issue 2 , June 2008 , pp. 213 - 233
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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