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Politics : Manmade Global Warming, A hoax? A Scam? or a Doomsday Cult?
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To: Don Hurst who wrote (3378)11/22/2013 2:41:47 PM
From: Maurice Winn  Read Replies (1) of 4326
 
Poor editing: <Fracking is needed when the reservoir material is not impermeable,> Had to shut down and go suddenly. That should of course be "when the reservoir material is impermeable".

Your point was about the earthquakes and displacements as oil and gas are removed. The proportion of material removed is minuscule compared with the material above and around the empty oil field, so there isn't much volume to be refilled.

In a place like NZ, there is constant earthquake activity. Such tiny little changes would be insignificant if the void did fill with a bang of displaced ground. In places with no earthquakes, such as London, England, there are trains and buses bumping along which create more shaking than would a collapsing oil field way down underground.

Where mines are close to the surface, such as in Waihi, New Zealand, where gold and silver are dug out, there have been serious localized collapses of old mine workings. nzherald.co.nz

I guess there are extensive coal fields which have been excavated and could collapse causing damaging surface displacement downwards in a hurry too.

Fracking to release entrained oil and gas doesn't cause such extensive holes as does excavation of all material as in gold and coal mining. So it's hard to see how collapse could occur.

Mqurice
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