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AN ACOUSTIC IMPEDANCE INVERSION APPROACH TO DETECT AND CHARACTERIZE GAS HYDRATE ACCUMULATIONS WITH SEISMIC METHODS: AN EXAMPLE FROM THE MALLIK GAS HYDRATE FIELD, NWT, CANADA

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dc.contributor.author Bellefleur, Gilles
dc.contributor.author Riedel, Michael
dc.contributor.author Mair, Stephanie
dc.contributor.author Brent, Tom
dc.date.accessioned 2008-07-29T17:58:38Z
dc.date.available 2008-07-29T17:58:38Z
dc.date.issued 2008-07
dc.identifier.citation Bellefleur, Gilles; Riedel, Michael; Mair, Stephanie; Brent, Tom. AN ACOUSTIC IMPEDANCE INVERSION APPROACH TO DETECT AND CHARACTERIZE GAS HYDRATE ACCUMULATIONS WITH SEISMIC METHODS: AN EXAMPLE FROM THE MALLIK GAS HYDRATE FIELD, NWT, CANADA. Proceedings of the 6th International Conference on Gas Hydrates (ICGH 2008), Vancouver, British Columbia, CANADA, July 6-10, 2008. en
dc.identifier.uri http://hdl.handle.net/2429/1171
dc.description.abstract Two internationally-partnered research well programs, in 1998 and 2002, studied the Mallik gas hydrate accumulation in the Mackenzie Delta, Canada. Gas hydrate bearing intervals were cored, logged and production tested thus establishing Mallik as an excellent site for testing geophysical imaging techniques. Here, we apply a model-based acoustic impedance inversion technique to 3D seismic reflection data acquired over the Mallik area to characterize gas hydrate occurrences and to help define their spatial extent away from well control. Sonic logs in Mallik research wells show that P-wave velocity of sediments increases with hydrate saturation, enough to produce detectable reflections for the lower two of three known gas hydrate zones. The inversion method converts these reflections into acoustic impedances from which velocity and hydrate saturation can be estimated. Acoustic impedance inversion results indicate that the deepest gas hydrate zone covers an area of approximately 900,000 m2. With some assumptions on the lateral continuity of gas hydrate saturation, porosity and thickness measured at the wells, we estimate that this zone contains approximately 771x106 m3 of gas at standard atmospheric pressure. At a regional scale, results allowed the detection of a high-velocity area near the A-06 well, about 6 km south-east of 5L-38. We infer that the high velocity area corresponds to a gas hydrate accumulation. Logging data in A-06 indicate the presence of gas hydrates in this area and support our interpretation. en
dc.format.extent 469086 bytes
dc.format.mimetype application/pdf
dc.language.iso eng en
dc.subject gas hydrates en
dc.subject acoustic impedance inversion en
dc.subject seismic en
dc.subject Mallik en
dc.subject ICGH 2008 en
dc.subject International Conference on Gas Hydrates 2008 en
dc.title AN ACOUSTIC IMPEDANCE INVERSION APPROACH TO DETECT AND CHARACTERIZE GAS HYDRATE ACCUMULATIONS WITH SEISMIC METHODS: AN EXAMPLE FROM THE MALLIK GAS HYDRATE FIELD, NWT, CANADA en
dc.type text en
dc.type.text conference Paper en
dc.description.affiliation Other en
dc.description.affiliation Other en
dc.description.reviewstatus en
dc.rights.copyright Bellefleur, Gilles en


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