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TitleSeismic characterization of gas hydrate accumulations in a permafrost environment: lessons learned from Mallik, Northwest Territories, Canada
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBellefleur, GORCID logo; Riedel, M; Huang, JORCID logo; Saeki, T; Milkereit, B; Ramachandran, K; Brent, T A
SourceScientific results from the JOGMEC/NRCan/Aurora Mallik 2007-2008 gas hydrate production research well program, Mackenzie Delta, Northwest Territories, Canada; by Dallimore, S RORCID logo (ed.); Yamamoto, K (ed.); Wright, J F (ed.); Bellefleur, GORCID logo (ed.); Geological Survey of Canada, Bulletin 601, 2012 p. 107-123, Open Access logo Open Access
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Scientific results from the JOGMEC/NRCan/Aurora Mallik 2007-2008 gas hydrate production research well program, Mackenzie Delta, Northwest Territories, Canada
File formatpdf
ProvinceNorthwest Territories
AreaMackenzie Delta
Lat/Long WENS-134.5000 -134.0000 69.5000 69.2500
Subjectsfossil fuels; engineering geology; geophysics; hydrocarbons; gas; hydrocarbon gases; hydrate; methane; methane hydrate; petroleum resources; geophysical surveys; gamma ray logging; gamma-ray surveys; seismic surveys; porosity; permeability; geothermics; modelling; production tests; drilling techniques; pressure-temperature conditions; logging techniques; Tertiary; Cenozoic
Illustrationslocation maps; profiles; schematic diagrams; plots; tables
ProgramGas Hydrates
Released2012 12 14 (13:00)
AbstractThree international research well programs, in 1998, 2002, and 2007-2008, studied the Mallik gas hydrate accumulation in the Mackenzie Delta and identified three distinct gas hydrate intervals in the crest of an anticline structure. The gas hydrate intervals are up to 40 m thick and have high saturation, sometimes exceeding 80% of pore volume in unconsolidated clastic sediments with porosities ranging from 25 to 40%. Here, we present a summary of the seismic work done to understand the distribution and characteristics of the Mallik gas hydrate. Results are based on a detailed analysis of the upper two seconds of a 3-D seismic-reflection data set provided to the JAPEX/JNOC/GSC et al. Mallik 5L-38 science program through partnership with the BP-ChevronTexaco-Burlington joint-venture parties. We applied an acoustic-impedance inversion to the 3-D seismic data to determine high-velocity areas associated with the gas hydrate and to help define its spatial extent away from well control. The extent and geometry of the two lower gas hydrate zones show a distribution controlled by local geology. Correlation between the uppermost gas hydrate zone and the 3-D seismic data could not be established with confidence. We investigated further the heterogeneous distribution of gas hydrate using multivariate, conditional, stochastic simulation of well-logging data. The volume of natural gas estimated from acoustic-impedance inversion and conditional simulation ranges from 112 x 106 to 4.7 x 109 m3/km2. These estimates are for a small volume of rocks centred on the Mallik wells and demonstrate the complexity of assessing gas hydrate resources from logging and seismic data.

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