20.3 Dry and Casinghead 1989-1995 volumes shown represent a manual tally of the production. Types Antrim Gas produced from the Antrim shale formation. The Antrim formation is a shallow gas producing reservoir which is productive across the northern part of the lower peninsula of Michigan. Casinghead Gas produced from oil wells. Dry Gas Gas produced primarily from the Niagaran reef formation.
Production occurs over two trends of reefs in the lower peninsula of Michigan.
The trends are commonly referred to as the Northern Trend and the Southern Trend. The PdC is the deepest gas producing formation in Michigan and is productive over the central portion of the lower peninsula of Michigan. Annual production figures used in MPSC Annual Report and Energy Appraisal are sometimes preliminary data, and therefore may differ from actuals above.