Don't really know much about it, but a lot of current oil pumping involves putting water and special sand down into the rock layers, to force the oils up and out.
So, kinda doing what you say.
A few billion barrels of oil is a drop in the bucket, not noticeable compared to the oceans and water available on this planet.
A lot of the sink holes come from limestone regions, where water over time carries away the limestone, as it very very slowly erodes from the underground water.
In certain cases underground mining and oil drilling clearly has caused the ground to cave in, of course. But most of what you hear is from limestone. If you see that house that is in the news, falling in a river, some speculate that an underground sprinkler system was enough to wet through and crack the limestone under the house.... Tho, to most of us it just looks like bad planning!
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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