KGS Home Educational Resources Petroleum Primer, Continued

Petroleum: a primer for Kansas, Figure 9
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Figure 9--Well logs, such as gamma ray-neutron and sonic logs, are recorded on strip graphs that are keyed to depths in the well. These logs can be used to determine rock types at given depths, and to indicate zones of porous tock. This is an actual example of combined well logs and rock data from a well drilled in Cahoj field, Rawlins County, Kansas.

electric logs help describe rocks to the geologist even where the rock can not be seen

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Kansas Geological Survey, Education
Placed online April 2001
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