Graphs and tables used to describe electrical measurements of samples of unconsolidated materials, USGS Petrophysical Laboratory, Denver

Abstract

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and strati graphic nomenclature. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Direct estimation of the distribution of relaxation times from induced‐polarization spectra using a Fourier transform analysis

“…However, the data usually exhibit high‐frequency behaviour (see Appendices and ). This high‐frequency dielectric effect (Olhoeft 1979; Campbell and Horton 2000) may be approximated by an additive term to the spectral conductivity (see Appendix and also Kruschwitz et al 2010). This additive term does not lead to a suitable time constant distribution (see discussion in Appendix ) and should be adjusted and removed from original spectral data prior to attempting to retrieve the distribution of relaxation times .…”

“…a). Resistivity data were fitted by Anderson et al (2001) with the sum of two Cole‐Cole models after removal of the dielectric effect as described by Campbell and Horton (2000): …”

Electrical property measurements of the Meade Peak phosphatic shale member of the Permian phosporia formation, Caribou County, Idaho

“…The voltage response of the sample was measured across two electrodes spaced 1 inch apart in the center of the sample holder. Further description of the laboratory procedures and apparatus used to make these measurements can be found in Campbell and Horton (2000).…”

Energy resources--cornucopia or empty barrel? (Discussions & Reply)

“…If the future peak in world oil production is approximately at a time when half the world's endowment has been produced, then the peak should lie well past the imminent peaking of production that Campbell forecasts. Campbell has criticized the U.S. Geological Survey numbers as being too large, but rather than making a careful critique of the geological data, discovery rate information, historical reserve growth data, and methodology used in the assessment, Campbell chose to dismiss the numbers as a plot by the United States government to undermine OPEC's confidence (Campbell, 2000).…”