Physics – Geophysics
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3204313s&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 4, CiteID L04313
Physics
Geophysics
1
Marine Geology And Geophysics: Gas And Hydrate Systems, Physical Properties Of Rocks: Magnetic And Electrical Properties (0925), Electromagnetics: Wave Propagation (2487, 3285, 4275, 4455, 6934), Exploration Geophysics: Downhole Methods, Electromagnetics: Numerical Methods
Scientific paper
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.
Goldberg Dorit
Sun Yan-Fen
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