ERSC 3V93 Lecture Notes - Lecture 43: Schlumberger, Frequency Domain, Time Constant
4 May 2016
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Document Summary
Uses the same array as in dc resistivity, but driving. Ip effect varies with effective resistivity of the host rock (that is, type of electrolyte, temperature, pore size, etc. ) Metal factor parameter corrects to some extent this variation. Cheargeability vs time constant: by measuring v(t), m and can be determined. Since the ip electrode is identical to resistivity, one can use any of the field spreads discussed for resistivity mapping. In practice, schlumberger, pole dipole with one current electrode removed (practically, away at great distance), and dipole dipole are the. Dipole-dipole: electrode spacing may be as small as 3 m, and as large n ranges from 1 to 10 as 300 m, use of switch boxes to reduce layout time, depth of penetration controlled by the spacing. Thus, the same line is traversed several times with different spacings, e. g. x=30 m and b=1, ,4 and so on; by doing so we obtain a compabination of lateral profiling and vertical sounding.
