Meteoric-water incursion into marine turbditic sandstones: Evidence from the Andrew Formation (Paleocene), UK Central Graben, North sea

Howri Mansurbeg, Sadoon Morad, Mohammad Al Suwaidi, Sherwan Qurtas, Ole Gunnar Tveiten, Salahaddin Shahrokhizadeh, Farkhondeh Kiani Harchegani

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11 Scopus citations

Abstract

Petrographic and stable carbon and oxygen isotope study revealed extensive meteoric water incursion during diagenesis of deep-water marine Paleocene turbidite sandstones in the North Sea (Andrew Formation, UK Central Graben). Meteoric-water diagenesis resulted in the dissolution and kaolinitization of framework silicates and cementation by calcite and methanogenic siderite and Fe-dolomite/ankerite. Incursion is envisaged to have occurred over large distances along well-connected, permeable shelf, slope and turbidite sand bodies during major fall in sea level, which resulted in exposure of the continental shelf. This work urges for consideration of the impact of undersaturated meteoric waters on reservoir-quality modifications during hydrocarbon exploration in marine turbidite sandstones.

Original languageBritish English
Article number104428
JournalMarine and Petroleum Geology
Volume118
DOIs
StatePublished - Aug 2020

Keywords

  • Andrew Formation
  • Diagenesis
  • Fe/carbonates
  • Kaolinite
  • Meteoric waters
  • Turbidite sandstones
  • UK Central Graben

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