Acoustic impedance inversion and seismic reflection continuity analysis for delineating gas hydrate resources near the Mallik research sites, Mackenzie Delta, Northwest Territories, Canada.

Riedel, Michael , Bellefleur, Gilles, Mair, Stephanie, Brent, Thomas A. and Dallimore, Scott R. (2009) Acoustic impedance inversion and seismic reflection continuity analysis for delineating gas hydrate resources near the Mallik research sites, Mackenzie Delta, Northwest Territories, Canada. Geophysics, 74 (5). B125-B137. DOI 10.1190/1.3159612.

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Abstract

We combine acoustic impedance inversion of 3D seismic data,
log-to-seismic correlation, and seismic attribute analyses to de-
lineate gas-hydrate zones at the Mallik site, Mackenzie Delta,
Northwest Territories, Canada. Well-log data define three dis-
tinct hydrate zones over a depth range of 890–1100 m. Synthetic
seismic modeling indicates the base of the two deeper hydrate
zones are prominent reflectors. The uppermost gas-hydrate zone
correlates to seismic data with a lower degree of confidence. The
extent and geometry of the two lower hydrate zones suggest that
local geology plays a significant role in the lateral and vertical
distribution of gas hydrate at Mallik. The reliability of the hy-
drate concentrations calculated from the inverted impedances is
qualified by the match between original and synthetic seismic
data to produce confidence maps for the two lower gas-hydrate-
bearing intervals. A total in-place volume estimate of solid gas
hydrate for an area of 1.44 km2
around well 5L-38 yields a value
of approximately 45
equivalently, 6.6 of gas. We further qualify our mapping of gas hydrates by some
amount of continuous resource, defined as lateral continuity
measured by seismic attribute similarity and sand-dominated
rock. Using these attributes, the continuous amount of hydrate at
Mallik is about half the in-place volume. Else-
where within the 3D seismic cube, the seismic impedance inver-
sion yields evidence of potential gas-hydrate deposits near wells
A-06 and P-59 at levels near the predicted base of the hydrate sta-
bility zone.

Document Type: Article
Keywords: Acoustic impedance; seismic reflection; gas hydrate resources; Mallik; Mackenzie Delta, Canada
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1190/1.3159612
ISSN: 0016-8033
Date Deposited: 18 Nov 2015 08:32
Last Modified: 18 Nov 2015 08:32
URI: http://oceanrep.geomar.de/id/eprint/30147

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