TRENTON-BLACK RIVER HTD RESERVOIRS OF THE MICHIGAN BASIN

摘要

1.Rochester South Oil Pool was discovered in 1992 by Paragon Petroleum Corporation 2.Rochester North Oil Pool was discovered in 1994 by Paragon Petroleum Corporation 3.Hydrothermally dolomitized (HTD) Trenton - Black River Group carbonates 4.Both pools trend NW-SE, are up to 5 km long and arc 300-600 m wide 5.Controlled by faults and fractures, created by strike-slip movements 6.Rochester South and North Oil Pools have 26 producing wells 7.Both trends produce oil from the Trenton but the north trend produces oil from the Black River 8.Reservoirs: 840 m (2760') and 940 m (3080'); 7800 kPa (1130 psi) and 25℃ 9.End 2015, cumulative oil production was 2.5 mmbbls 10.Estimated to be >92% of the recoverable reserves using a 15% recovery factor 11.Porosity: 3-15% (8%) matrix, 18-45% fractures; Permeability: 10-300 md (150 md) in matrix and 2-10 Dareies for fractures 12.Oil is sweet. 40° API, with solution gas; water saturation 15 to 40%, irreducible 15 to 20% 13.Typical decline rates between 15 and 25% per year