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ABSTRACT: Deep River and North Adams Fields: Devonian Fracture-Controlled Dolomite Reservoirs in the Central Michigan Basin

Ron C. Budros, Keith R. Johnson

Fracture-controlled dolomite reservoirs have produced significant oil reserves in the Michigan basin. The best known fracture-controlled fields are the Albion-Scipio and Stoney Point trends that produce from Ordovician carbonates. However, Devonian fracture-controlled dolomite reservoirs, such as Deep River and North Adams fields, have been encountered in the central Michigan basin and are almost twice as prolific as the Ordovician trends on a barrel of oil recovered per acre basis.

A case study of the Deep River and North Adams fields in Arenac County indicate that both fields are linear stratigraphic traps in which fracture-controlled secondary dolomite reservoirs are limestone. The dolomitization and porosity development are a function of deep burial diagenesis similar to the Albion-Scipio and Stoney Point trends and numerous Mississippi Valley type lead-zinc deposits. Seismic exploration technology has advanced to the point that deliberate searches for these subtle traps can be conducted. Analysis of seismic models constructed of these fields along with actual seismic data and color attribute displays complement the geologic study and provide a realistic understanding of seismic signatures associated with these reservoirs and the necessary level of seismic re olution.

AAPG Search and Discovery Article #90998 AAPG Eastern Section Meeting, London, Ontario, Canada, September 10-12, 1990