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Title: Distribution, chemistry, isotopic composition and origin of diagenetic carbonates: Magnus Sandstone, North Sea

Abstract

Diagenetic ferroan carbonates grew in the Upper Jurassic reservoir sandstones of the Magnus oilfield in porewaters which differed in composition across the field. These porewaters remained compositionally different and stratified for at least 35 M.y. Variations in carbonate chemistry across the field are attributable to these porewater variations, which resulted from displacement of marine depositional water from the crest of the field by meteoric water during late Cimmerian subaerial exposure. Original depositional facies and detrital mineralogy strongly influenced diagenetic carbonate distribution. The objective of this paper is twofold: (1) to describe the occurrence of burial diagenetic magnesian siderite and ankerite from the Magnus Sandstone, and (2) to show that variations in the elemental and isotopic geochemistry of siderite and ankerite relate to long-lived variations in the composition of the porewaters in the sandstone during diagenesis.

Authors:
;  [1];  [2]
  1. Univ. of Glasgow (United Kingdom)
  2. Scottish Univ. Research and Reactor Centre, Glasgow (United Kingdom)
Publication Date:
OSTI Identifier:
6513098
Resource Type:
Journal Article
Journal Name:
Journal of Sedimentary Petrology; (United States)
Additional Journal Information:
Journal Volume: 63:1; Journal ID: ISSN 0022-4472
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 58 GEOSCIENCES; GEOLOGIC DEPOSITS; DIAGENESIS; MINERALOGY; NORTH SEA; ANKERITE; CHEMICAL COMPOSITION; DEPOSITION; GEOCHEMISTRY; GEOLOGIC FORMATIONS; GEOLOGIC HISTORY; INTERSTITIAL WATER; ISOTOPE RATIO; JURASSIC PERIOD; PETROLEUM DEPOSITS; RESERVOIR ROCK; SANDSTONES; SIDERITE; ALKALINE EARTH METAL COMPOUNDS; ATLANTIC OCEAN; CALCIUM CARBONATES; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATE MINERALS; CARBONATES; CHEMISTRY; GEOLOGIC AGES; GROUND WATER; HYDROGEN COMPOUNDS; IRON CARBONATES; IRON COMPOUNDS; IRON ORES; MAGNESIUM CARBONATES; MAGNESIUM COMPOUNDS; MANGANESE CARB; MESOZOIC ERA; MINERAL RESOURCES; MINERALS; ORES; OXYGEN COMPOUNDS; RESOURCES; ROCKS; SEAS; SEDIMENTARY ROCKS; SURFACE WATERS; TRANSITION ELEMENT COMPOUNDS; WATER; 020200* - Petroleum- Reserves, Geology, & Exploration; 580000 - Geosciences

Citation Formats

Macaulay, C I, Haszeldine, R S, and Fallick, A E. Distribution, chemistry, isotopic composition and origin of diagenetic carbonates: Magnus Sandstone, North Sea. United States: N. p., 1993. Web.
Macaulay, C I, Haszeldine, R S, & Fallick, A E. Distribution, chemistry, isotopic composition and origin of diagenetic carbonates: Magnus Sandstone, North Sea. United States.
Macaulay, C I, Haszeldine, R S, and Fallick, A E. 1993. "Distribution, chemistry, isotopic composition and origin of diagenetic carbonates: Magnus Sandstone, North Sea". United States.
@article{osti_6513098,
title = {Distribution, chemistry, isotopic composition and origin of diagenetic carbonates: Magnus Sandstone, North Sea},
author = {Macaulay, C I and Haszeldine, R S and Fallick, A E},
abstractNote = {Diagenetic ferroan carbonates grew in the Upper Jurassic reservoir sandstones of the Magnus oilfield in porewaters which differed in composition across the field. These porewaters remained compositionally different and stratified for at least 35 M.y. Variations in carbonate chemistry across the field are attributable to these porewater variations, which resulted from displacement of marine depositional water from the crest of the field by meteoric water during late Cimmerian subaerial exposure. Original depositional facies and detrital mineralogy strongly influenced diagenetic carbonate distribution. The objective of this paper is twofold: (1) to describe the occurrence of burial diagenetic magnesian siderite and ankerite from the Magnus Sandstone, and (2) to show that variations in the elemental and isotopic geochemistry of siderite and ankerite relate to long-lived variations in the composition of the porewaters in the sandstone during diagenesis.},
doi = {},
url = {https://www.osti.gov/biblio/6513098}, journal = {Journal of Sedimentary Petrology; (United States)},
issn = {0022-4472},
number = ,
volume = 63:1,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1993},
month = {Fri Jan 01 00:00:00 EST 1993}
}