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TitleIdentifying a gas hydrate production zone using a cased-hole borehole acoustic-reflection survey, Aurora/JOGMEC/NRCan Mallik 2L-38 gas hydrate production research well
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorVoskamp, A; Lingxia, Z; Murray, D R; Torii, K; Yamamoto, H; Noguchi, S; Yamamoto, K; Dallimore, S RORCID logo
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. 173-189, 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; tables; schematic models; profiles
ProgramGas Hydrates
Released2012 12 14 (13:00)
AbstractIn 2007, data were acquired from a borehole acoustic-reflection survey (BARS), using the latest Sonic Scanner™ tool, in a gas-hydrate-bearing formation in the Mallik field, Mackenzie Delta, Northwest Territories. The BARS data were logged in a cased-hole environment in which no azimuthal information could be recovered, thus limiting the final migration image-processing and interpretation. Performing BARS in a cased hole is less favourable than in an open-hole environment because the high-amplitude casing arrivals make the identification of reflected energy very challenging. In addition, no tool orientation data are usable in a cased hole due to the lack of reliable measurement of the Earth's magnetic field. In this paper, we present results acquired in a cased-hole environment and indicate correlations of BARS data with auxiliary logs.
The perforation zone is identified in the raw and filtered wave-form BARS data. Energy in the 1098 to 1105 m depth interval is significantly stronger, and this zone of higher amplitudes appears to extend into the formation. This zone is assumed to be directly related to changes in the formation caused by the perforations and/or production in the lower half of the production-test interval. Several additional reflections can be observed in the raw and filtered wave forms. The gamma-ray and density logs indicate formation changes at the same depths at which these reflections occur. These formation boundaries and the reflections also correlate well with the fullbore microresistivity image logs. The results indicate that BARS data can be used to achieve a more complete, detailed, and thus enhanced log interpretation.

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