Reply to discussion by P. H. Nelson and G. D. Van Voorhis by authors

Geophysics ◽  
1977 ◽  
Vol 42 (1) ◽  
pp. 121-123
Author(s):  
K. L. Zonge ◽  
J. C. Wynn
Keyword(s):  
Phase Model ◽  
Spectral Measurements ◽  
Field Surveys ◽  
Complex Resistivity ◽  
Resistivity Measurements ◽  
Standard Field ◽  
Recent Advances

The main objectives of “Recent Advances and Applications in Complex Resistivity Measurements” were to demonstrate the utility of making spectral measurements in standard field surveys and to show that rocks have characteristic signatures which do not conform to the constant phase model advocated by Nelson and Van Voorhis. We can understand the questions arising out of the relative inaccuracy statement.

On: “Recent Advances and Applications in Complex Resistivity Measurements,” by K. L. Zonge and J. C. Wynn (GEOPHYSICS, Oct. 1975, p. 851–864)

Geophysics ◽  
1977 ◽  
Vol 42 (1) ◽  
pp. 120-121 ◽  
Author(s):  
P. H. Nelson ◽  
G. D. Van Voorhis
Keyword(s):  
Spectral Data ◽  
Induced Polarization ◽  
Complex Resistivity ◽  
Resistivity Measurements ◽  
Recent Advances ◽  
Measuring Techniques

In presenting a variety of induced polarization spectral data, Zonge and Wynn refer to a paper published earlier by us (Van Voorhis et al., 1973) which deals with the same topic. We feel Zonge and Wynn have misrepresented our measuring techniques, data, and conclusions in their references to our paper. Our principal objections center on three statements by the authors.

RECENT ADVANCES AND APPLICATIONS IN COMPLEX RESISTIVITY MEASUREMENTS

Geophysics ◽  
1975 ◽  
Vol 40 (5) ◽  
pp. 851-864 ◽  
Author(s):  
Kenneth L. Zonge ◽  
Jeffrey C. Wynn
Keyword(s):  
Host Rock ◽  
Electromagnetic Coupling ◽  
Field Measurements ◽  
Complete Removal ◽  
Induced Polarization ◽  
Laboratory Measurements ◽  
Spectral Measurements ◽  
Complex Resistivity ◽  
Geophysical Interpretation ◽  
Rock Alteration

Several years of accumulating complex resistivity spectral measurements have indicated that there are still many unexplored areas in induced polarization surveying that need to be investigated for a more complete understanding of the polarization process. In addition to providing mineral discrimination capabilities, complex resistivity spectra can be used to differentiate between various barren host rock responses, to facilitate the complete removal of electromagnetic coupling, and to identify pipeline, fence, and various other cultural coupling effects. Results of field measurements are presented in an effort to demonstrate the utility of and necessity for making complete spectral measurements for serious geophysical interpretation. Correlation of field measurements with laboratory measurements on core samples from the same area demonstrates that strong electromagnetic coupling can be accurately removed from complete spectra without removing the important rock response. Recent field and laboratory measurements indicate that most, if not all, induced polarization responses attributed to magnetite are not really due to this mineral but can be traced to a host rock alteration response. Also, characteristic host rock signatures for sulfide environments appear to vary according to locality and type of deposits making it impossible to provide a universal set of signatures for sulfide deposits.

Complex resistivity measurements in field using a pseudo‐noise source

1994 ◽  
Author(s):  
T. R. M. Prasad ◽  
B. D. Ramaiah ◽  
S. C. Jain ◽  
B. S. Reddy
Keyword(s):  
Noise Source ◽  
Complex Resistivity ◽  
Resistivity Measurements ◽  
Pseudo Noise
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