Distribution, chemistry, isotopic composition and origin of diagenetic carbonates: Magnus Sandstone, North Sea
- Univ. of Glasgow (United Kingdom)
- Scottish Univ. Research and Reactor Centre, Glasgow (United Kingdom)
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.
- OSTI ID:
- 6513098
- Journal Information:
- Journal of Sedimentary Petrology; (United States), Vol. 63:1; ISSN 0022-4472
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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