Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 54 SYLVAJN J. PIRSON TABLE I a 10 20 40 60 80 100 p'i/pa .082 .920 •7 18 .582 •505 •463 \Ki hi/a Ai I u/a hi hi/a hi hi/a hi hi/a Hi • 576 15-2 -^ c .920 228 9-5 o-3 .2 45 18 0 156 9-3 — —. — u 588 23 5 331 x9-9 190 15 2 088 in hi 709 28 3 436 323 25 8 253 ' c 1—1 799 31 9 540 32-4 422 33 7 357 35-7 1-765 35-5 889 35 6 621 497 39 8 433 43-3 0 1-835 367 969 38 7 700 42.
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 54 SYLVAJN J. PIRSON TABLE I a 10 20 40 60 80 100 p'i/pa .082 .920 •7 18 .582 •505 •463 \Ki hi/a Ai I u/a hi hi/a hi hi/a hi hi/a Hi • 576 15-2 -^ c .920 228 9-5 o-3 .2 45 18 0 156 9-3 — —. — u 588 23 5 331 x9-9 190 15 2 088 in hi 709 28 3 436 323 25 8 253 ' c 1—1 799 31 9 540 32-4 422 33 7 357 35-7 1-765 35-5 889 35 6 621 497 39 8 433 43-3 0 1-835 367 969 38 7 700 579 46 3 510 381 1 039 41 5 770 648 51 8 578 57-8 1 118 44 8 834 5° 0 707 640 determination to the second layer may be considered as very good. We have: £1 = 33 feet and #1 = Thus the value of the resistivity of the second layer is p2 = p'i ( )= 2,630 ohm feet. By mak- \ 1 — K\ / making use of the inflection point on the lower part of the curve situated approximately at the electrode spacing 300 feet, the total thickness of the two top layers is estimated at hi+fa = l 300=200 30 ¥0 Fig. 6.—Depth-resistivity factor curves. M 714
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