A likely liquids-rich resource play targeting the Silurian age A-1 Carbonate is fast developing in the Michigan Basin.  Some have compared the A-1 Carbonate to the middle member of the Bakken shale at prolific Parshall Field in North Dakota.  The emerging Michigan play appears to be developing in an area with abundant shows from the A-1, including a well drilled by Gulf Oil in 1941, which tested rates as high as 12 MMcf/d and 100 Bc/d.

The A-1 Carbonate is the lowermost Salina carbonate cycle which is often observed to ...