Sometimes you just drill a hole in the ground and oil flows out. In these days of unconventional reservoirs, zipper fracs, mile-long horizontals and microseismic surveys, pursuing shallow, conventional oil exploration may seem dated.And yet, in southern Michigan, there's a vibrant play looking for dolomite chimneys in the Ordovician Trenton-Black River. Since 2006, nearly 50 producing wells have been drilled in the vintage Albion-Scipio trend in Hillsdale, Calhoun, Jackson and Lenawee counties.
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