New stratigraphic and genetic model for the dolomitic Cretaceous Pinda reservoirs in Angola: Part II - Compelling arguments against early dolomitization and early leaching
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Data
2019-01-01
Autores
Granier, Bruno [UNESP]
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Resumo
This is the second contribution to the stratigraphic and genetic model of the Pinda Group. The mid-Cretaceous Pinda Group of the Congo basin in the northern Angolan offshore is a transgressi-ve supersequence. Its lower part is made of Bufalo and Pacassa facies that correspond respectively to mixed and calcareous-dolomitic grain-dominated fabrics. Both facies were strongly diagenetically alte-red, mostly by dolomitic replacement and leaching. Contrary to opinions expressed by other authors that both styles of alteration are early diagenetic phenomena, there is substantial evidence for a burial origin with dolomitic replacement and leaching of calcite having started at depths not less than 150 m and 400 m, respectively.
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Albian, Angola, Cementation, Cenomanian, Chemical compaction, Dolomite, Leaching, Mechanical compaction, Pinda, Replacement, Reservoirs
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Carnets de Geologie, v. 19, n. 4, p. 47-70, 2019.