Hydrocarbon gases in Palaeogene volcanic rocks from the Lopra-1/1A well, Faroe Islands
Hydrocarbon gases were monitored in the drilling fluid during deepening of the Lopra-1 well from 2178–3565 m, in which thermogenic, methane-rich gases had been found previously. The mud gas con-centration, up to 105 ppm of methane, was generally higher in the hyaloclastite sequence, 2470 m – termina...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.540.699 2023-05-15T16:10:56+02:00 Hydrocarbon gases in Palaeogene volcanic rocks from the Lopra-1/1A well, Faroe Islands Troels Laier The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.540.699 http://www.geus.dk/publications/bull/nr9/nr9_p79-90.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.540.699 http://www.geus.dk/publications/bull/nr9/nr9_p79-90.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geus.dk/publications/bull/nr9/nr9_p79-90.pdf Faroes Lopra-1/1A volcanics hydrocarbon gas isotopes headspace methane cuttings text ftciteseerx 2016-01-08T11:03:20Z Hydrocarbon gases were monitored in the drilling fluid during deepening of the Lopra-1 well from 2178–3565 m, in which thermogenic, methane-rich gases had been found previously. The mud gas con-centration, up to 105 ppm of methane, was generally higher in the hyaloclastite sequence, 2470 m – terminal depth (TD), than in the overlying lavas of the lower basalt formation. The highest concen-trations of mud gas in the lower basalt formation were associated with the more porous tuffaceous zones, whereas no simple relationship could be established between measured mud gas concentrations and porosity of the hyaloclastic rocks, which showed less marked porosity variations than the lavas. Chemical (C2+ < 1%) and isotopic (δ13C1: –34 to –39‰) compositions of seven samples of mud gas collected at peak gas concentrations between 2657 m and 3442 m compare well with those of the hydrocarbon gases which had been seeping more or less continuously into the existing well since 1983, suggesting a common origin of the gases. Headspace methane concentrations measured in 135 canned samples of cuttings were scattered between 10 ppm and 6 × 103 ppm, with the exception of six samples from a short interval, 2685– 2745 m, which showed consistently high values> 104 ppm. No particularly gas-rich zones were indi-cated, however, by the mud gas, nor was any significant change in lithology noted for this interval. It Text Faroe Islands Faroes Unknown Faroe Islands Lopra ENVELOPE(-6.771,-6.771,61.444,61.444) |
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ftciteseerx |
language |
English |
topic |
Faroes Lopra-1/1A volcanics hydrocarbon gas isotopes headspace methane cuttings |
spellingShingle |
Faroes Lopra-1/1A volcanics hydrocarbon gas isotopes headspace methane cuttings Troels Laier Hydrocarbon gases in Palaeogene volcanic rocks from the Lopra-1/1A well, Faroe Islands |
topic_facet |
Faroes Lopra-1/1A volcanics hydrocarbon gas isotopes headspace methane cuttings |
description |
Hydrocarbon gases were monitored in the drilling fluid during deepening of the Lopra-1 well from 2178–3565 m, in which thermogenic, methane-rich gases had been found previously. The mud gas con-centration, up to 105 ppm of methane, was generally higher in the hyaloclastite sequence, 2470 m – terminal depth (TD), than in the overlying lavas of the lower basalt formation. The highest concen-trations of mud gas in the lower basalt formation were associated with the more porous tuffaceous zones, whereas no simple relationship could be established between measured mud gas concentrations and porosity of the hyaloclastic rocks, which showed less marked porosity variations than the lavas. Chemical (C2+ < 1%) and isotopic (δ13C1: –34 to –39‰) compositions of seven samples of mud gas collected at peak gas concentrations between 2657 m and 3442 m compare well with those of the hydrocarbon gases which had been seeping more or less continuously into the existing well since 1983, suggesting a common origin of the gases. Headspace methane concentrations measured in 135 canned samples of cuttings were scattered between 10 ppm and 6 × 103 ppm, with the exception of six samples from a short interval, 2685– 2745 m, which showed consistently high values> 104 ppm. No particularly gas-rich zones were indi-cated, however, by the mud gas, nor was any significant change in lithology noted for this interval. It |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Troels Laier |
author_facet |
Troels Laier |
author_sort |
Troels Laier |
title |
Hydrocarbon gases in Palaeogene volcanic rocks from the Lopra-1/1A well, Faroe Islands |
title_short |
Hydrocarbon gases in Palaeogene volcanic rocks from the Lopra-1/1A well, Faroe Islands |
title_full |
Hydrocarbon gases in Palaeogene volcanic rocks from the Lopra-1/1A well, Faroe Islands |
title_fullStr |
Hydrocarbon gases in Palaeogene volcanic rocks from the Lopra-1/1A well, Faroe Islands |
title_full_unstemmed |
Hydrocarbon gases in Palaeogene volcanic rocks from the Lopra-1/1A well, Faroe Islands |
title_sort |
hydrocarbon gases in palaeogene volcanic rocks from the lopra-1/1a well, faroe islands |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.540.699 http://www.geus.dk/publications/bull/nr9/nr9_p79-90.pdf |
long_lat |
ENVELOPE(-6.771,-6.771,61.444,61.444) |
geographic |
Faroe Islands Lopra |
geographic_facet |
Faroe Islands Lopra |
genre |
Faroe Islands Faroes |
genre_facet |
Faroe Islands Faroes |
op_source |
http://www.geus.dk/publications/bull/nr9/nr9_p79-90.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.540.699 http://www.geus.dk/publications/bull/nr9/nr9_p79-90.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1765996060443934720 |