Project Final Report-08123-12-The project has three goals. The first is to evaluate the degree of control that primary depositional facies have on current reservoir variability in hydrothermal dolomite reservoirs in the Ordovician Trenton/Black River trend of the Michigan Basin. This involves determining how these primary facies and their position within a sequence stratigraphic framework control reservoir quality units that developed laterally away from the major fault zones. The second goal is to correlate laboratory measured sonic velocity data from various Ordovician Trenton/Black River reservoir and non-reservoir facies to actual sonic logs and 3-D seismic signatures. A third goal is to produce 3-D stratigraphic and reservoir models using Schlumberger’s 3-D Petrel modeling software, that will be tested with data obtained from recently drilled wells.