76 J.C. KARCHER AND EUGENE McDERMOTT 
1,600 and 2,000 feet. If so, this fact may well account for the re- 
sistivity “high” observed. This case illustrates very well some of the 
limitations of the electrical method as previously discussed. A driller’s 
log of the well is given in Table I. 
ANDERSON COUNTY, KANSAS, AREA 
The area under consideration is located in Sec. 10, T. 23 S., 
R. 20 E., Anderson County, Kansas. The procedure was exactly the 
same as followed in the two foregoing cases. The following spreads 
were employed: .5—.1-10’, .5—.2-20’, .5—.3-150’, and .5-.4-500’. The 
contour maps shown in Figure 8 for the four different spreads suggest 
the presence of an insulator at a depth of somewhat less than 500 
feet. As the spread is increased, the effect of this disappears as shown 

Fic. 7.—Resistivity contours, Anderson County, Kansas, area. 
on the contour map for the .5—.2—50’ set-up. Upon further lengthen- 
ing the spread, the presence of another insulator is indicated. A well 
drilled on the south side of Section 10, with the exception of a very 
slight showing of gas at 550 feet, was abandoned at a total depth of 
736 
