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TitleRay-based cross-well tomography for P-wave velocity, anisotropy, and attenuation structure around the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate production research well
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBauer, K; Haberland, C; Pratt, R G; Hou, F; Medioli, B E; Weber, M H
SourceScientific Results from the Mallik 2002 Gas Hydrate Production Research Well Program, Mackenzie Delta, Northwest Territories, Canada; by Dallimore, S RORCID logo (ed.); Collett, T S (ed.); Geological Survey of Canada, Bulletin no. 585, 2005, 21 pages; 1 CD-ROM, Open Access logo Open Access
PublisherNatural Resources Canada
MediaCD-ROM; on-line; digital
RelatedThis publication is contained in Scientific Results from the Mallik 2002 Gas Hydrate Production Research Well Program, Mackenzie Delta, Northwest Territories, Canada
File formatpdf
ProvinceNorthwest Territories
AreaMackenzie Delta; Beaufort Sea
Lat/Long WENS-134.7500 -134.5000 69.5000 69.4167
Subjectsfossil fuels; geophysics; hydrocarbons; gas; hydrocarbon gases; hydrate; methane; methane hydrate; petroleum resources; biogenic gas; geophysical surveys; seismic velocities; seismic waves; p waves; anisotropy; attenuation; lithostratigraphy; Mallik 5L-38; Tertiary; Cenozoic
Illustrationsplots; tables; schematic cross-sections; stratigraphic sections
ProgramMallik 2002 Gas Hydrate Production Research Well Program
Released2005 08 25
AbstractCross-well seismic data from the Mallik 2002 project were analyzed using ray-based tomographic reconstruction algorithms. Images of the P-wave velocity, the P-wave anisotropy, and the P-wave attenuation (Qp-1) structures are reconstructed from the picked arrival times and from ray-path - averaged attenuation values. The reconstructed horizontal velocities are generally 10 to 20% faster than the vertical
velocities. The reconstructed isotropic P-wave velocities correspond to the average of the horizontal and vertical velocities. The reconstructions image the delta-front - shallow-marine Mackenzie Bay Sequence and the underlying fluviodeltaic Kugmallit Sequence. The tomograms are dominated by the effects of the gas hydrate deposits, which cause elevated seismic velocities. The location of laminated silt is correlated with increased velocity anisotropy. A combination of high velocities and strong attenuation (Qp<15) is observed in sediments with the highest gas hydrate saturation, which provides constraints on models for the microscopic structure of the deposits.

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