ILLINOIS ORDOVICIAN-CAMBRIAN OIL SOURCE FOUND

Scientists at the Illinois State Geological Survey, Champaign, have documented the first example of an oil derived from Lower Ordovician or Cambrian source rocks in the Illinois basin. Geochemical analyses were performed on oil recovered from dolomites in the Ordovician Knox group at 7,876 ft in the Unocal Corp. 1 Cisne Community well in 3-1s-7e, Wayne County, drilled in 1967 This oil, the deepest occurrence from the Illinois basin analyzed to date, is the first to document that a deep source