| Title | Seismic characterization of gas hydrate accumulations in a permafrost environment: lessons learned from Mallik, Northwest Territories, Canada |
| Download | Download (whole publication) |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Bellefleur, G ;
Riedel, M; Huang, J; Saeki, T; Milkereit, B; Ramachandran, K;
Brent, T A |
| Source | Scientific results from the JOGMEC/NRCan/Aurora Mallik 2007-2008 gas hydrate production research well program, Mackenzie Delta, Northwest Territories, Canada; by Dallimore, S R (ed.); Yamamoto, K (ed.); Wright, J F (ed.); Bellefleur, G (ed.); Geological Survey of Canada, Bulletin 601, 2012 p. 107-123, https://doi.org/10.4095/292086  Open Access |
| Year | 2012 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| Related | This 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 format | pdf |
| Province | Northwest Territories |
| NTS | 107C/06 |
| Area | Mackenzie Delta |
| Lat/Long WENS | -134.5000 -134.0000 69.5000 69.2500 |
| Subjects | fossil 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 |
| Illustrations | location maps; profiles; schematic diagrams; plots; tables |
| Program | Gas Hydrates |
| Released | 2012 12 14 (13:00) |
| Abstract | Three 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. |
| GEOSCAN ID | 292086 |
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