Meteoric-water diagenesis in late Cretaceous canyon-fill turbidite reservoirs from the Espírito Santo Basin, eastern Brazil

H. Mansurbeg, L. F. De Ros, S. Morad, J. M. Ketzer, M. A K El-Ghali, M. A. Caja, R. Othman

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Parameters controlling the diagenetic evolution of passive margin, marine turbidites, which are important targets of hydrocarbon exploration, are poorly constrained in the literature. This study aims to unravel the conditions of diagenesis and its impact on the reservoir quality evolution from late Cretaceous canyon-filling turbiditic sandstones of the onshore portion of Espírito Santo Basin, eastern Brazil. Kaolinization (δ 18O=+13.3‰ to +15.2‰; δ D=-96.6‰ to -79.6‰) and dissolution of framework silicate grains is attributed to meteoric water incursion during eodiagenesis in response to a considerable fall in relative sea-level. Eogenetic alterations also include cementation by siderite (average δ 18O=-7.2‰; δ 13C=+9.3‰) and pyrite. Progressive sediment burial (present depths=1530-2027m) resulted in the formation of poikilotopic calcite, ferroan dolomite-ankerite (average δ 18O=-7.9‰; δ 13C=+2.9‰), minor amounts of quartz overgrowths and in partial dickitization of kaolinite. Isotopic values of calcite and dolomite-ankerite follow two trends of co-variance of δ 13C with decreasing δ 18O and increasing temperature. From a composition closer to marine (≈0‰), one trend goes towards positive δ 13C values (up to +22.4‰ for calcite; +18.6‰ for dolomite-ankerite), indicating increasing input of carbonate from methanogenic fermentation. The other trend develops towards negative δ 13C values (down to -17.2‰ for calcite; 15‰ for dolomite-ankerite), suggesting increasing contribution from thermal decarboxylation with increasing temperature and depth. Despite the presence of various cement types, mechanical compaction was more important than cementation in reducing depositional porosity in the onshore Urucutuca sandstones.

Original languageEnglish
Pages (from-to)7-26
Number of pages20
JournalMarine and Petroleum Geology
Volume37
Issue number1
DOIs
Publication statusPublished - Nov 2012

Fingerprint

ankerite
canyons
Brazil
turbidite
calcite
meteoric water
canyon
diagenesis
dolomite
fill
Cretaceous
cementation
sandstones
trends
basin
water
tectosilicate
sandstone
siderites
decarboxylation

Keywords

  • Diagenesis
  • Reservoir-quality
  • Turbidites
  • Urucutuca

ASJC Scopus subject areas

  • Economic Geology
  • Geology
  • Geophysics
  • Stratigraphy
  • Oceanography

Cite this

Meteoric-water diagenesis in late Cretaceous canyon-fill turbidite reservoirs from the Espírito Santo Basin, eastern Brazil. / Mansurbeg, H.; De Ros, L. F.; Morad, S.; Ketzer, J. M.; El-Ghali, M. A K; Caja, M. A.; Othman, R.

In: Marine and Petroleum Geology, Vol. 37, No. 1, 11.2012, p. 7-26.

Research output: Contribution to journalArticle

Mansurbeg, H. ; De Ros, L. F. ; Morad, S. ; Ketzer, J. M. ; El-Ghali, M. A K ; Caja, M. A. ; Othman, R. / Meteoric-water diagenesis in late Cretaceous canyon-fill turbidite reservoirs from the Espírito Santo Basin, eastern Brazil. In: Marine and Petroleum Geology. 2012 ; Vol. 37, No. 1. pp. 7-26.
@article{3aabf858e904421b8bcc9c7101f78398,
title = "Meteoric-water diagenesis in late Cretaceous canyon-fill turbidite reservoirs from the Esp{\'i}rito Santo Basin, eastern Brazil",
abstract = "Parameters controlling the diagenetic evolution of passive margin, marine turbidites, which are important targets of hydrocarbon exploration, are poorly constrained in the literature. This study aims to unravel the conditions of diagenesis and its impact on the reservoir quality evolution from late Cretaceous canyon-filling turbiditic sandstones of the onshore portion of Esp{\'i}rito Santo Basin, eastern Brazil. Kaolinization (δ 18O=+13.3‰ to +15.2‰; δ D=-96.6‰ to -79.6‰) and dissolution of framework silicate grains is attributed to meteoric water incursion during eodiagenesis in response to a considerable fall in relative sea-level. Eogenetic alterations also include cementation by siderite (average δ 18O=-7.2‰; δ 13C=+9.3‰) and pyrite. Progressive sediment burial (present depths=1530-2027m) resulted in the formation of poikilotopic calcite, ferroan dolomite-ankerite (average δ 18O=-7.9‰; δ 13C=+2.9‰), minor amounts of quartz overgrowths and in partial dickitization of kaolinite. Isotopic values of calcite and dolomite-ankerite follow two trends of co-variance of δ 13C with decreasing δ 18O and increasing temperature. From a composition closer to marine (≈0‰), one trend goes towards positive δ 13C values (up to +22.4‰ for calcite; +18.6‰ for dolomite-ankerite), indicating increasing input of carbonate from methanogenic fermentation. The other trend develops towards negative δ 13C values (down to -17.2‰ for calcite; 15‰ for dolomite-ankerite), suggesting increasing contribution from thermal decarboxylation with increasing temperature and depth. Despite the presence of various cement types, mechanical compaction was more important than cementation in reducing depositional porosity in the onshore Urucutuca sandstones.",
keywords = "Diagenesis, Reservoir-quality, Turbidites, Urucutuca",
author = "H. Mansurbeg and {De Ros}, {L. F.} and S. Morad and Ketzer, {J. M.} and El-Ghali, {M. A K} and Caja, {M. A.} and R. Othman",
year = "2012",
month = "11",
doi = "10.1016/j.marpetgeo.2012.03.009",
language = "English",
volume = "37",
pages = "7--26",
journal = "Marine and Petroleum Geology",
issn = "0264-8172",
publisher = "Elsevier BV",
number = "1",

}

TY - JOUR

T1 - Meteoric-water diagenesis in late Cretaceous canyon-fill turbidite reservoirs from the Espírito Santo Basin, eastern Brazil

AU - Mansurbeg, H.

AU - De Ros, L. F.

AU - Morad, S.

AU - Ketzer, J. M.

AU - El-Ghali, M. A K

AU - Caja, M. A.

AU - Othman, R.

PY - 2012/11

Y1 - 2012/11

N2 - Parameters controlling the diagenetic evolution of passive margin, marine turbidites, which are important targets of hydrocarbon exploration, are poorly constrained in the literature. This study aims to unravel the conditions of diagenesis and its impact on the reservoir quality evolution from late Cretaceous canyon-filling turbiditic sandstones of the onshore portion of Espírito Santo Basin, eastern Brazil. Kaolinization (δ 18O=+13.3‰ to +15.2‰; δ D=-96.6‰ to -79.6‰) and dissolution of framework silicate grains is attributed to meteoric water incursion during eodiagenesis in response to a considerable fall in relative sea-level. Eogenetic alterations also include cementation by siderite (average δ 18O=-7.2‰; δ 13C=+9.3‰) and pyrite. Progressive sediment burial (present depths=1530-2027m) resulted in the formation of poikilotopic calcite, ferroan dolomite-ankerite (average δ 18O=-7.9‰; δ 13C=+2.9‰), minor amounts of quartz overgrowths and in partial dickitization of kaolinite. Isotopic values of calcite and dolomite-ankerite follow two trends of co-variance of δ 13C with decreasing δ 18O and increasing temperature. From a composition closer to marine (≈0‰), one trend goes towards positive δ 13C values (up to +22.4‰ for calcite; +18.6‰ for dolomite-ankerite), indicating increasing input of carbonate from methanogenic fermentation. The other trend develops towards negative δ 13C values (down to -17.2‰ for calcite; 15‰ for dolomite-ankerite), suggesting increasing contribution from thermal decarboxylation with increasing temperature and depth. Despite the presence of various cement types, mechanical compaction was more important than cementation in reducing depositional porosity in the onshore Urucutuca sandstones.

AB - Parameters controlling the diagenetic evolution of passive margin, marine turbidites, which are important targets of hydrocarbon exploration, are poorly constrained in the literature. This study aims to unravel the conditions of diagenesis and its impact on the reservoir quality evolution from late Cretaceous canyon-filling turbiditic sandstones of the onshore portion of Espírito Santo Basin, eastern Brazil. Kaolinization (δ 18O=+13.3‰ to +15.2‰; δ D=-96.6‰ to -79.6‰) and dissolution of framework silicate grains is attributed to meteoric water incursion during eodiagenesis in response to a considerable fall in relative sea-level. Eogenetic alterations also include cementation by siderite (average δ 18O=-7.2‰; δ 13C=+9.3‰) and pyrite. Progressive sediment burial (present depths=1530-2027m) resulted in the formation of poikilotopic calcite, ferroan dolomite-ankerite (average δ 18O=-7.9‰; δ 13C=+2.9‰), minor amounts of quartz overgrowths and in partial dickitization of kaolinite. Isotopic values of calcite and dolomite-ankerite follow two trends of co-variance of δ 13C with decreasing δ 18O and increasing temperature. From a composition closer to marine (≈0‰), one trend goes towards positive δ 13C values (up to +22.4‰ for calcite; +18.6‰ for dolomite-ankerite), indicating increasing input of carbonate from methanogenic fermentation. The other trend develops towards negative δ 13C values (down to -17.2‰ for calcite; 15‰ for dolomite-ankerite), suggesting increasing contribution from thermal decarboxylation with increasing temperature and depth. Despite the presence of various cement types, mechanical compaction was more important than cementation in reducing depositional porosity in the onshore Urucutuca sandstones.

KW - Diagenesis

KW - Reservoir-quality

KW - Turbidites

KW - Urucutuca

UR - http://www.scopus.com/inward/record.url?scp=84864779146&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84864779146&partnerID=8YFLogxK

U2 - 10.1016/j.marpetgeo.2012.03.009

DO - 10.1016/j.marpetgeo.2012.03.009

M3 - Article

VL - 37

SP - 7

EP - 26

JO - Marine and Petroleum Geology

JF - Marine and Petroleum Geology

SN - 0264-8172

IS - 1

ER -