Brent, T. A., Riedel, Michael , Caddel, M., Clement, M., Collett, T. S. and Dallimore, S. R. (2005) Initial geophysical and geological assessment of an industry 3D seismic survey covering the JAPEX/JNOC/GSC Mallik 5L-38 gas hydrate research well. In: Scientific Results from JAPEX/JNOC/GSC Mallik 5L-38 Gas Hydrate Research Well, Mackenzie Delta, Northwest Territories, Canada. , ed. by Dallimore, S. R. and Collett, T. S.. Geological Survey of Canada Bulletin, 585 . Geological Survey of Canada, Ottawa, 14 .

Abstract

Industry 3D seismic covers the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate well. Interpretation supported by biostratigraphy indicates a normally-faulted anticline with 5L-38 occupying the northern downthrown crest. This EW-striking fault, near 5L-38, has 800 m throw interpreted 700 m below gas hydrate levels. Fault offset at 5L-38 gas hydrate levels is probably several hundred metres less, because syn-depositional fault movement during or after Late Eocene time is suggested. Down hole velocity surveys at Imperial Mallik wells, P-59, J-37 and A-06, infer 105, 225, and 135 m gas hydrate, respectively, compared to 116 m known at 5L-38. Gas hydrate seismic characterization includes: multiple, generally weak, near-horizontal events; amplitude features on geologic reflectors; amplitude “blanking” and; chaotic vertical reflective zones surrounding faults. Recognized data contamination include amplitude-frequency degradation beneath lakes and reverberated energy. Noted are spatial correspondence of some subsurface faults with position/orientation of surface lakes, suggesting a possible genetic link.

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