Stratigraphic Controls on the Distribution of Diagenetic Processes, Quality and Heterogeneity of Fluvial-Aeolian Reservoirs from the Recôncavo Basin, Brazil

  1. Sadoon Morad,
  2. J. Marcelo Ketzer and
  3. Luiz F. De Ros
  1. Luiz Fernando De Ros and
  2. Claiton M.S. Scherer

Published Online: 22 MAY 2013

DOI: 10.1002/9781118485347.ch5

Linking Diagenesis to Sequence Stratigraphy

Linking Diagenesis to Sequence Stratigraphy

How to Cite

De Ros, L. F. and Scherer, C. M.S. (2013) Stratigraphic Controls on the Distribution of Diagenetic Processes, Quality and Heterogeneity of Fluvial-Aeolian Reservoirs from the Recôncavo Basin, Brazil, in Linking Diagenesis to Sequence Stratigraphy (eds S. Morad, J. M. Ketzer and L. F. De Ros), John Wiley & Sons, Inc., West Sussex, UK. doi: 10.1002/9781118485347.ch5

Author Information

  1. Institute of Geosciences, Federal University of Rio Grande do Sul - UFRGS, Av. Bento Gonçalves, 9500, Agronomia, CEP 91501-970, Porto Alegre, RS, Brazil (E-mail: lfderos@inf.ufrgs.br)

Publication History

  1. Published Online: 22 MAY 2013
  2. Published Print: 11 JAN 2013

ISBN Information

Print ISBN: 9781118485392

Online ISBN: 9781118485347

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Keywords:

  • Brazil;
  • diagenetic processes;
  • fluvial-aeolian reservoirs;
  • petrology;
  • Recôncavo rift basin;
  • Sergi Formation;
  • stratigraphic sequences

Summary

An integrated petrologic-stratigraphic study was performed on the Sergi Formation, main reservoir of Recôncavo rift basin, north-eastern Brazil. Three third-order stratigraphic sequences, limited by regional unconformities, were defined: the basal Sequence I, characterized by intercalation of lacustrine and floodplain mudrocks with fluvial and aeolian sandstones; Sequence II, characterized by coarse sandstones deposited in a braided fluvial system; Sequence III, thin and dominantly aeolian. The sandstones are dominantly subarkoses with provenance from uplifted basement blocks of Precambrian plutonic and high-grade metamorphic terrains. The porosity and permeability of the Sergi reservoirs are strongly influenced by diagenetic processes, mostly by compaction,mechanical infiltration of clays and cementation by calcite, quartz and chlorite. The characterization of the patterns of distribution of the diagenetic processes and products as a function of stratigraphy, geography and depth of the Sergi sandstones is important for increasing oil recovery and production efficiency from these complex reservoirs.