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TitleGeochemistry of the interstitial waters of the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate production research well
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AuthorMatsumoto, R; Tomaru, H; 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, 14 pages; 1 CD-ROM, https://doi.org/10.4095/220764 (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; petroleum resources; sandstones; mudstones; water analyses; water geochemistry; sodium; potassium; magnesium; calcium; strontium; barium; chloride; sulphate; Mallik 5L-38; gas saturation; Tertiary; Cenozoic
Illustrationssketch maps; stratigraphic sections; histograms; profiles
ProgramMallik 2002 Gas Hydrate Production Research Well Program
Released2005 08 25
AbstractInterstitial waters were extracted from the sediments of the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate production research well drilled in the Mackenzie Delta, and analyzed for Cl- , SO4 2- , Na+, K+, Ca2+, Mg2+, Sr2+, and Ba2+. Cored intervals are divided into zone 1 (low salinity), zone 2 (higher salinity), zone 3 (low salinity), and zone 4 (high salinity), in descending order. Zones 1 and 3 correspond to
gas-hydrate-bearing sandstone, whereas zone 2 is a gas-hydrate-freemudstone and zone 4 a gas-hydrate-free sandstone below the base of gas hydrate stability. Anomalies of low Cl- and Na+ concentrations indicate that gas hydrate saturations (Sh) are 60 to 85%, which is not always consistent with Sh values obtained from logging data. This is because of a build-up of either saline or fresher residual water during the formation/dissociation of gas hydrate in a closed system. An unusually higher concentration of SO4 2- in organic-rich, deep-seated sediments suggests a likely invasion of seawater and contamination by drilling fluids.
GEOSCAN ID220764