Nathan D. Webb and James L. Best
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1 Nathan D. Webb and James L. Best
2 Background Pennsylvanian oil production Stratigraphy & geologic setting Study area Methods Using geophysical logs & core Results Comparing three channel deposits Implications
3 Southeastern Illinois Early development Continued production CO 2 EOR and storage possibilities Abundant data Well logs Core
4 Lower Pennsylvanian Caseyville Fm. Tradewater Fm. Largely sandstones and shales Sub-Pennsylvanian unconformity From Nelson et al., 2011
5 Modified from Jacobson 2000 From Archer and Greb 1995
6 Chesterian subcrop SW trending paleovalleys 134 m of relief Overprinted on structural features From Bristol & Howard 1971
7 From Pryor and Potter 1979 From Potter and Siever 1956
8 From Kvale and Archer 2007 From Lineback 1979
9 Three subsurface examples Caseyville and Tradewater Formations Comparison of observed facies Implications for basin sedimentation and oil reservoirs
10 Three subsurface examples Areas with dense log and core control Each sandstone is an oil reservoir Partlow Hardinville Robins
11 Diagrammatic N-S Cross section showing stratigraphic position of three channels Core was examined from each channel
12 Tradewater Formation Dimensions 2.5+ km long 1 km wide m thick W/T = 33 NE-SW trend 8 Cores
13 Facies Description Interpretation Fl Silty shale with occasional beds of very-fine sandstone; ripple bedded; laminated Overbank Fsc Fine laminated shale Floodplain or estuarine mud PS Sp Sr Fine to medium grained sandstone; weak pedogenic features; rootlets; disturbed bedding; carbonaceous fragments Fine to medium grained sandstone with planar crossbeds; common soft sediment deformation; siderite clasts along bed set surfaces Fine to medium grained sandstone with rippled bedding Paleosol 2D-3D Dunes Ripples Sm Medium to coarse grained sandstone with massive bedding; can be calcareous Mass flow (?)
14 Caseyville Formation Dimensions 5 km long 0.8 km wide m thick W/T = 18 NE-SW trend 3 Cores Modified from Howard & Whitaker 1988
15 Facies Description Interpretation * Fsc* Fl Sm Sp Gm Fine laminated shale; thin silt and sand lenses; bioturbated Interbedded shale and silty veryfine grained sandstone; ripple bedded Fine to medium grained sandstone with massive to weakly subhorizontal bedding Medium to coarse grained sandstone with planar crossbeds; common quartz granules; siderite clasts along bed set surfaces Crudely bedded gravel or gravelly sandstone; contains coal, shale, siderite, and lithic clasts; siderite or calcite cemented matrix Estuarine mud Overbank Mass flow (?) 2D-3D Dunes Lag *inferred from logs and analogous channels
16 Tradewater Formation Dimensions 3+ km long 1.1 km wide 5-50 m thick W/T = 22 NE-SW trend 18 Cores
17 Facies Description Interpretation Fl Interbedded shale and silty very-fine grained sandstone; ripple bedded; rhythmic; few bidirectional ripples; weakly bioturbated; sideritized bands Tidally influenced overbank or estuarine muds Fsc Fine laminated shale Floodplain or estuarine mud Sm Sp Gm Medium grained sandstone with massive bedding Medium to coarse grained sandstone with planar crossbeds; common soft sediment deformation; siderite clasts along bed set surfaces Crudely bedded gravel or gravelly sandstone; contains coal, shale, siderite, and lithic clasts; siderite or calcite cemented matrix Mass flow (?) 2D-3D Dunes Lag
18 Partlow Active channel Predominately ripples and dunes Weak paleosol in upper part Hardinsville Active channel became estuarine Predominately dunes Most of valley is filled with estuarine mud Robins Active Channel Predominately dunes and mass flow Common gravelly zones along bed set surfaces and no overall grain size trends 5 0 m
19 2D-3D Dunes Ripples Paleosol Estuarine mud 2D-3D Dunes Overbank 2D-3D Dunes Mass flow (?) Lag
20 Regional three dimensional changes Tidal influence wanes stratigraphically higher and updip General fining upward trend across channels Narrow sheets Becoming slightly broader through time less confined to bedrock valleys Possibly formed through multiple episodes of deposition
21 Channel dimensions Arrangement of architectural elements From Gibling 2006
22 Potential for additional studies of known and unknown channels in the area Partlow Robinson (?) Hardinville Robins Buchanan Biehl
23 Pennsylvanian channels are common in southeastern Illinois and are a resource Changes in channel fill and morphology through time give clues as to how the basin filled Carboniferous basins with similar deposits exist all over the world
24 Garden of the Gods, Southern Illinois Brimham Rocks, North Yorkshire, England
25 Nathan D. Webb and James L. Best
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