Gas potential of new Albany shale (Devonian-Mississippian) in the Illinois Basin

摘要: A study to update and evaluate publicly available data relating present potential gas production from New Albany Shale in the Illinois basin was conducted cooperatively by Indiana. Illinois, Kentucky geological surveys (Illinois Basin Consortium), partially funded Gas Research Institute. Deliverables included a plate of stratigraphic cross sections six basin-wide maps at scale 1:1,000,000. The is an organic-rich brownish black shale throughout basin. may be great because it contains estimated 86 tcf natural has produced modest volumes since 1858 more than 60 fields, mostly southeastern part Reservoir beds include shales Grassy Creek (Shale), Clegg Creek, Blocher (Shale) members. Limited geologic carbon isotope indicate that indigenous thermogenic. T[sub max] suggest generation begins R[sub o] values 0.53% begin 0] as low 0.41% some beds. reservoirs contain both free open-pore space adsorbed on clay kerogen surfaces. Natural fracturing ismore » essential for effective reservoir permeability. Fractures are most common near structures such faults, flexures, buried carbonate banks. Based limited data, fractures joints have preferred orientations 45-225[degrees] 135-315[degrees]. Commercial requires well stimulation connect bore with fracture system prop open pressure-sensitive near-borehole fractures. Current stimulations employ hydraulic treatments using nitrogen foam, sand propping agent.« less