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Gold/Mining/Energy : Strictly: Drilling and oil-field services
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To: pz who wrote (60565)2/18/2000 11:25:00 PM
From: kormac  Read Replies (1) of 95453
 
Paul,

Regarding the borehole temperature study. Here is how I understand it. The earth's crust has a certain temperature variation from its core to the surface and as you driller friends said, the temperature increases as go down toward the molten core. Let us call this the "background temperature variation".

Now look at the daily temperature variation. It influences the earth's temperature only over a very short distance from the earth's surface temperature.

The effect of the yearly variation is felt deeper from the surface because it take place over much longer period.

If one has a 100 year change, it would be felt even deeper. To make sense of the temperature readings in the borehole, one only needs to subtract the "background temperature
variation" out.

with my best, Seppo
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