Scientific results from the deepened Lopra-1 borehole, Faroe Islands: A reconnaissance study of fluid inclusions in fracture-filling quartz and calcite from the Lopra-1/1A well, Faroe Islands

Fracture-filling calcite and quartz from the Lopra-1/1A well (at 2380 m and 3543 m depth) contains both aqueous low-salinity fluid inclusions and hydrocarbon-dominated fluid inclusions. Microthermometry indicates that the aqueous fluids contain 0.2 to 1.4 equivalent weight% NaCl and occasionally con...

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Bibliographic Details
Main Author: Konnerup-Madsen, Jens
Format: Article in Journal/Newspaper
Language:English
Published: Geological Survey of Denmark and Greenland 2006
Subjects:
Basalts
Faroe Islands
fluid inclusions
hydrocarbons
veins
zeolites
Geology
QE1-996.5
Geophysics. Cosmic physics
QC801-809
Lopra
Geological Survey of Denmark and Greenland Bulletin
Online Access:https://doaj.org/article/11f7a1ba02ca450eb9dba16170dbfc77
Description
Summary:Fracture-filling calcite and quartz from the Lopra-1/1A well (at 2380 m and 3543 m depth) contains both aqueous low-salinity fluid inclusions and hydrocarbon-dominated fluid inclusions. Microthermometry indicates that the aqueous fluids contain 0.2 to 1.4 equivalent weight% NaCl and occasionally contain traces of hydrocarbons. Homogenisation to liquid occurred between 90°C and 150°C. Modelling based on these fluid inclusion observations indicates that during burial the basaltic section was subjected to temperatures of 160°C and 170°C, occasional pressures of 600–700 bars and the simultaneous percolation of aqueous and hydrocarbon fluids. These fluid conditions may also be relevant to the formation of zeolite observed in the Lopra-1/1A well.

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