Hydrocarbon gases in the crystalline rocks of the Gravberg-1 well, Swedish deep gas project

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doi: 10.1016/0264-8172(88)90030-X
Authors:Laier, Troels
Author Affiliations:Primary:
Geol. Surv. Denmark, Copenhagen, Denmark
Volume Title:Marine and Petroleum Geology
Source:in conjunction with the [Marine and Petroleum Geology, 5(4), p.370-377. Publisher: Butterworth] Geological Society, Surrey, United Kingdom. ISSN: 0264-8172
Publication Date:1988
Note:In English. 33 refs.; illus.
Summary:Desorbed gas analyses of cuttings from this well near the NE edge of the Siljan Ring, central Sweden, were taken every 100 m from 219 to 5907 m. Trace amounts of two types of hydrocarbon gases were found; the type associated with dolerite sills was an isotopically heavy, delta13C1 -11 to -15 per mille, dry gas with methane <=98%. The other type occurs throughout the granitic rocks and was an isotopically lighter gas, delta13C1 -21 to -39 per mille, containing 30-45% of C2- C5. The dry gas in the dolerites is assumed to be abiogenic gas from inclusions in minerals which react with acid in the analytical procedure. The other type of gas is thought to have been formed from H2 and CO2 by a catalytic reaction such as the Fischer-Tropsch reaction associated with magnetite. [R.A.H.]
Subjects:C-13/C-12; Carbon; Carbon dioxide; Cores; Crystalline rocks; Gases; Geochemistry; Granites; Hydrocarbons; Igneous rocks; Isotopes; Organic compounds; Plutonic rocks; Stable isotopes; Europe; Scandinavia; Sweden; Western Europe; Gravberg; Organic materials; Ratios
Abstract Numbers:89M/4701
Record ID:1989007472
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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