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Sun & Goldberg 2005
Sun, Y.F. and Goldberg, D. (2005). Dielectric method of high-resolution gas hydrate estimation. Geophysical Research Letters 32: doi: 10.1029/2004GL021976. issn: 0094-8276.

In-situ dielectric properties of natural gas hydrate are measured for the first time in the Mallik 5L-38 Well in the Mackenzie Delta, Canada. The average dielectric constant of the hydrate zones is 9, ranging from 5 to 20. The average resistivity is >5 ohm.m in the hydrate zones, ranging from 2 to 10 ohm.m at a 1.1 GHz dielectric tool frequency. The dielectric logs show similar trends with sonic and induction resistivity logs, but exhibits inherently higher vertical resolution (<5 cm). The average in-situ hydrate saturation in the well is about 70%, ranging from 20% to 95%. The dielectric estimates are overall in agreement with induction estimates but the induction log tends to overestimate hydrate content up to 15%. Dielectric estimates could be used as a better proxy of in-situ hydrate saturation in modeling hydrate dynamics. The fine-scale structure in hydrate zones could help reveal hydrate formation history.

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Abstract

Keywords
Marine Geology and Geophysics, Gas and hydrate systems, Physical Properties of Rocks, Magnetic and electrical properties, Electromagnetics, Wave propagation (2487, 3285, 4275, 4455, 6934), Exploration Geophysics, Downhole methods, Electromagnetics, Numerical methods
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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