"INDUCED POLARIZATION DATA AT ... - University of Utah

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CHU the pyrite contents are about the same but the clay content (Qv) of sample (f) is larger. The increased clay content has lowered the background resistivity of sample (f) and according to equation (1) the pyrite and clay dispersions, labelled "PYRITE f" and "CLAY f" respectively, have been moved to higher frequencies. Summing up the effects as in the top of the figure gives a sketch of the observed data. The lowering of the background resistivity as temperature increases might also be expected to shift the phase dispersions of our samples. As noted previously, for samples (a), (b), (d), and (e), there is a noticeable drop of as much as 22mr in the magnitude of the phase values at the highest frequencies. This may be due to the fact that as temperature increases, the resistivity of the rock sample decreases; the phase spectrum of the rock will shift slightly up frequency, as shown schemat icall yin Figure 5. In the frequency range of the 1 ab data, thi s shift is perceived as a drop in phase values for the positive slope of the phase spectrum, and an increase in phase values for the negative slope of the spectrum (see phase spectra in Figures 2b and 2d). Figure 5 also shows that one may be able to gain more information on low frequency phase behavior by increasing temperature. An exception to the above sample (f) of Figure 2f, which behaves in an opposite manner at the higher frequencies: the phase rises by about 20mr at 75°C.
FIG. 5. Schematic explanation of temperature effect on phase spectrum for sample (b) of Figure 2b. Heavy lines denote frequency range of lab data. The drop in resistivity as temperature rises, shown by the resistivity plot, causes the phase spectrum to shift to a higher frequency; thus one may be able to gain more information on the phase behavior at low frequencies by increasing temperature. CHU
Page 1 and 2: GL04031 "INDUCED POLARIZATION DATA
Page 3 and 4: INTRODUCTION CHU The purpose of thi
Page 5: FIG. 2' Location map of Roosevelt H
Page 8: Data Acquisition LABORATORY RESEARC
Page 11 and 12: TABLE 1. Parameter values of effect
Page 13: FIGS. 2a-2f. Laboratory data arrang
Page 16 and 17: and (e). Both samples have comparat
Page 18 and 19: PI = background (rock) resistivity,
Page 20: FIG. 3. A schematic explanation of
Page 26 and 27: - E q - r t- > C/) lJJ 0:: - lJJ -"
Page 28: FIG. 9. 20 resistivity model (botto
Page 31: FIG. 10. Fault pattern in survey ar
Page 34 and 35: -500 -400 -300 -200 !o- -100 E ....
Page 37: FIG. 12. Pseudosections resulting f
Page 40 and 41: SUMMARY AND CONCLUSIONS CHU The lab
Page 42 and 43: esponse of this hot-water dominated
Page 44: REFERENCES CHU Ballantyne, G. H., 1
Page 48 and 49: CHU generator unit. To reduce elect
Page 51: FIGS. la-le. Phase (mr) field data
Page 54: FIG. 8. 20 model (bottom) for Line

"INDUCED POLARIZATION DATA AT ... - University of Utah

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