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To: eric deaver who wrote (7734)	8/4/1998 3:52:00 PM
From: Thomas C. White	Read Replies (1) \| Respond to of 11684

I'm clueless on Devonian shale. The main problem with the Chalk was that a lot of the fractures were vertical or near vertical. Means a straight down drill might only hit one fracture. If there are many horizontal fractures in a formation, then a vertical drill can hit multiple fractures and therefore produce from several depths. Chalk is very dense, mostly nonporous and impermeable, so you can only produce from structural fractures through which oil seeps into the chalk from below. While I was doing my geology work at Baylor in Texas, there was a lot of initial drilling going on in the Chalk. It broke a lot of people. But there wasn't much horizontal drilling going on then, it was a relatively new technology (early '80's).