Methane Hydrate Production From Alaskan Permafrost Progress Report Page: 61 of 225
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Estimated Insitu Resistivity
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y = -216.73Ln(x) + 1577.7
R2 = 0.97931200
Depth (ft)
Figure 40. Calculated formation resistivity in permafrost zone at Hot Ice No. 1
7.1.4 Conclusions - Resistivity in Ugnu Formation
Although there appears to be more experimental "noise" in the electrical measurements than is
desirable, the general analysis is consistent with measurements made using the CMR and
water salinity estimates made by several means. The assumption that salinity of the unfrozen
brine as a function of temperature is only that necessary for the brine not to freeze, seems to
give reasonable results. Salinity of the unfrozen brine seems to be reasonably well calculated
by simple volumetric considerations. Finally, frozen rock pore geometry behaves like a typical
low porosity sandstone with m equal to 2.
7.2 West Sak Formation
All West Sak samples were recovered from below the permafrost. With the exception of the
deepest sands, they were completely unconsolidated. Resistivity R was measured on 52
samples from the West Sak. Two samples from the sand section were measured in their
recovered state to provide information on the salinity of the brine saturating West Sak sands.
Six "shale" samples from two different depths were also measured in their recovered state.
These measurements provide a comparison to the resistivity logs in shale and information on
resistivity anisotropy. The 44 remaining samples were all horizontal plugs that were cleaned
and dried in a low temperature vacuum oven, and on which He porosity and permeability k at
three confining stresses (800, 1200, and 1800 psi) had been measured.DE-FC26-01 NT41331
Core and Fluid Analysis- 55 -
Maurer Technology Inc.
Anadarko Petroleum Corp.500
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Sigal, Richard; Newsham, Kent; Williams, Thomas; Freifeld, Barry; Kneafsey, Timothy; Sondergeld, Carl et al. Methane Hydrate Production From Alaskan Permafrost Progress Report, report, February 1, 2005; United States. (https://digital.library.unt.edu/ark:/67531/metadc786910/m1/61/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.