Schlumberger soundings and interpretations

Figure 20: Schlumberger sounding and interpretation, Kitty Todd (see Figure 4).  Figure 23 includes labels explaining data (small circles), calculated curve (smooth curve), simple 4-layered model, equivalent models (alternate models that yield the same calculated curve) and a 'detailed' curve (one layer per data point).  Anyone who wants to discuss this in detail should send an email to Dr. Don Stierman.

Table 2: Kitty Todd electrical stratigraphy (Figure 20).

Layer
Resistivity (Ωm)
Depth (m) to top/bottom
Interpretation
1
1570
0/1.2
Moist sand
2
206
1.2/9.3
Water-saturated sand
3
107
9.3/30
Ohio Shale
4
800
30/??
Carbonate bedrock

Figure 21:  Schlumberger sounding and interpretation, Stranahan Elementary (see Figure 5).  The location for this sounding, not indicated in Figure 5, is near the south end of GPR profile 2.

Table 3: Stranahan Elementary electrical resistivity, sounding 1 (Figure 21).

Layer
Resistivity (Ωm)
Depth (m) to top/bottom
Interpretation
1
1434
0/1.1
Loose sand
2
496
1.1/4.5
Compact, damp, under-saturated sand
3
28
4.5/9.5
Clay or till
4
148
9.5/??
lacustrine silt

This sounding point is near the valley incised by 10 Mile Creek, which probably allows groundwater that saturates shallow sand elsewhere to drain away.


Figure 22: Schulmberger sound and interpretation, Stranahan Elementary (Figure 5).



Table 4: Stranahan Elementary electrical resistivity, sounding 2 (Figure 22).

Layer
Resistivity (Ωm)
Depth (m) to top/bottom
Interpretation
1
4775
0/2.1
Loose, dry sand
2
102
2.1/25
Water-saturated sand
3
188
25/??
lacustrine silt

It is interesting that significant differences exist between Figure 22 and Figure 23, this merits further study.  This delta may be quite complex.

Figure 23: Schlumberger sounding and interpretation, Secor Metropark (Figure 6).

 


Table 5: Secor Metropark electrical stratigraphy

Layer
Resistivity (Ωm)
Depth (m) to top/bottom
Interpretation
1
2740
0/3.5
Loose  unsaturated sand
2
69
3.5/11.5
Saturated sand
3
223
11.5/??
Ohio Shale

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