The epigenetic karstic systems in carbonate rocks are the result of the dissolution caused by meteoric waters during the geological time. The topic investigated in this study are the structural and sedimentary discontinuities that control the formation of vuggy porosity by epigenic fluids in carbonate units. These discontinuities include vertical fractures, horizontal and vertical stylolites and sedimentary discontinuities, such as cross stratifications. In this work, we studied these karst features in the Cretaceous carbonates of the Jandaíra Formation, Potiguar Basin, Brazil. In order to describe these discontinuities, we performed four stratigraphic columns and collected Schimdt hammer data and horizontal and vertical plugs to analyse porosity and permeability in each layer and at the boundary between layers. We also investigated diagenetic features at the thin section and electronic microscopy scales. The findings indicate that vertical fractures and vertical stylolites were dissolved together by meteoric water percolation and cross cut all the layers, which allowed the horizontal fluid flow along sedimentary discontinuities. We conclude that structural and sedimentary discontinuities control fluid flow during diagenesis and influence the development of vuggy porosity.


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  1. Carozzi, A. V., Bergen, D. Von
    , 1987. Stylolitic porosity in carbonates: a critical factor for deep hydrocarbon production.J. Pet. Geol.10, 267–282. https://doi.org/10.1111/j.1747-5457.1987.tb00946.x
    [Google Scholar]
  2. Cazarin, C.L., Bezerra, F.H.R., Borghi, L., Santos, R. V., Favoreto, J., Brod, J.A., Auler, A.S., Srivastava, N.K.
    , 2019. The conduit-seal system of hypogene karst in Neoproterozoic carbonates in northeastern Brazil.Mar. Pet. Geol.101, 90–107. https://doi.org/10.1016/j.marpetgeo.2018.11.046
    [Google Scholar]
  3. Choquette, P.W., Pray, L.C.
    , 1970. Geologic Nomenclature and Classification of Porosity in Sedimentary Carbonates, AAPG Bulletin.American Association of Petroleum Geologists.
    [Google Scholar]
  4. Dunham, R.J.
    , 1962. Classification of Carbonate Rocks According to Depositional Textures, in: Classification of Carbonate Rocks According to Depositional Textures. AAPG Special Volumes, pp. 108–121.
    [Google Scholar]
  5. La Bruna, V., Agosta, F., Lamarche, J., Viseur, S., Prosser, G.
    , 2018. Fault growth mechanisms and scaling properties in foreland basin system: The case study of Monte Alpi, Southern Apennines, Italy.J. Struct. Geol.116, 94–113. https://doi.org/10.1016/J.JSG.2018.08.009
    [Google Scholar]
  6. Heald, M.T.
    , 1959. Significance of Stylolites in Permeable Sandstones.SEPM J. Sediment. Res. Vol. 29, 251–253. https://doi.org/10.1306/74D708F3-2B21-11D7-8648000102C1865D
    [Google Scholar]
  7. Lucia, F.J.
    , 2007. Carbonate reservoir characterization: An integrated approach, 2nd ed. SpringerVerlag Berlin Heidelberg. https://doi.org/10.1007/978-3-540-72742-2
    [Google Scholar]
  8. Matos, R.M.D.
    , 1992. The Northeast Brazilian Rift System.Tectonics11, 766–791. https://doi.org/10.1029/91TC03092
    [Google Scholar]

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