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TitleEvolution of a gas hydrate system as recorded by oxygen and hydrogen isotopes of the interstitial waters of the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate production research well
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AuthorTomaru, H; Matsumoto, R; Chen, Y F; Lu, H; Clark, I D
SourceScientific Results from the Mallik 2002 Gas Hydrate Production Research Well Program, Mackenzie Delta, Northwest Territories, Canada; by Dallimore, S R (ed.); Collett, T S (ed.); Geological Survey of Canada, Bulletin no. 585, 2005, 12 pages; 1 CD-ROM, https://doi.org/10.4095/220768 (Open Access)
Year2005
PublisherNatural Resources Canada
Documentserial
Lang.English
MediaCD-ROM; on-line; digital
RelatedThis publication is contained in Dallimore, S R; Collett, T S; (2005). Scientific Results from the Mallik 2002 Gas Hydrate Production Research Well Program, Mackenzie Delta, Northwest Territories, Canada, Geological Survey of Canada, Bulletin no. 585
File formatpdf
ProvinceNorthwest Territories
NTS107C/06NW
AreaMackenzie Delta; Beaufort Sea
Lat/Long WENS-134.7500 -134.5000 69.5000 69.4167
Subjectsfossil fuels; geochemistry; hydrocarbons; gas; hydrocarbon gases; hydrate; methane; methane hydrate; oxygen isotopes; hydrogen isotopes; isotopes; water analyses; water geochemistry; Mallik 5L-38; gas saturation; Tertiary; Cenozoic
Illustrationsstratigraphic sections; profiles; diagrams; Schematic diagrams
ProgramMallik 2002 Gas Hydrate Production Research Well Program
Released2005 08 25
AbstractInterstitial waters from the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate production research well were analyzed for Cl-, d18O, and dD (deuterium) to document the process of gas hydrate formation and estimate levels of gas hydrate saturation. Within the zone of gas hydrate stability, low Cl- concentrations and positive d18O and dD anomalies were observed in interstitial water samples collected from
gas-hydrate-bearing sediments, especially in sands that were highly saturated with gas hydrate. The interstitial water becomes enriched in Cl-, 18O, and D with increasing depth, implying that it was originally derived from river water and that mixing with seawater has changed its composition. Baseline values of d18O and dD were observed to increase stepwise and can be grouped into six zones. The baseline values increase with depth independently in each zone. It is hypothesized that this zonation arose from changes in the temperature-
pressure conditions for gas hydrate stability that occurred from the last glacial epoch to the present.
GEOSCAN ID220768