Trenton Limestone -- The Karst That Wasn’t There, or Was It?

Keith, Brian D.; Wickstrom, Lawrence H.

doi:10.2110/cor.93.18.0167

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…4A), as well as the presence of a phosphorite and pyrite encrusted unconformity on top of the Lexington and Trenton limestones (Fig. 5) in the trough at least as far north as the Cincinnati area (Keith and Wickstrom 1993;Kolata et al 2001;Ettensohn et al 2002;McLaughlin and Brett 2007).…”

Section: Late Ordovician Geologic Frameworkmentioning

confidence: 94%

“…The top of the Trenton Limestone in much of the Sebree Trough is disconformable along a sharp corrosion surface (Fig. 1), a locally pyritized and phosphate-rich surface of non-deposition (Keith 1989;Keith and Wickstrom 1993;Kolata et al 2001;Ettensohn et al 2002). Along the margins of the trough and in northeastern parts of Ohio, upper parts of the Trenton Limestone grade into the shalier Point Pleasant and Kope formations; farther south in the Lexington, Kentucky, area, upper parts of the partially equivalent Lexington Limestone are mid-Katian (latest Chatfieldian to early Edenian) in age and similarly intertongue with more shaly units (Cressman 1973;Ettensohn et al 2002).…”

Section: Stratigraphic Frameworkmentioning

confidence: 99%

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Subsurface Relationships between the Sebree Trough and Carbonate-Siliciclastic Mixing in the Upper Ordovician Lexington-Trenton and Point Pleasant-Utica Intervals in Ohio, USA, using Multivariate Statistical Well Log Analysis

Bloxson

Saylor

Ettensohn

2022

OJS

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The Upper Ordovician (lower Katian; upper Chatfieldian-lower Edenian) Lexington-Trenton limestone and Point Pleasant-Utica shale intervals are important subsurface stratigraphic units across Ohio as they are the sources of significant conventional and unconventional hydrocarbon resources. However, both units exhibit anomalous distributions across the state and heterogeneous relationships, especially in areas where they intertongue. The limestone units show a peculiar SW-NE thinning trend across Ohio, whereas the overlying shale units show an anomalous thickening along the same trend—a trend associated with the poorly understood Sebree Trough, a supposed Late Ordovician paleobathymetric low related to the coeval Taconic Orogeny. To explore relationships amon Lexington-Trenton carbonates, Point Pleasant-Utica shales, and the presumed Sebree Trough, multivariate statistical analysis was used to compare geophysical well logs across the state with well logs referenced to the mineral content of 4 Lexington-Trenton-Point Pleasant-Utica cores. Comparing well-log responses with the mineral content of the reference cores allowed the discernment of 10 electrofacies, keyed to lithofacies in the cores. Software analysis of many other well logs across the state then made electrofacies assignments by comparing well-log responses from the other wells with well-log responses from the reference cores preset into the software. Electrofacies responses were color-coded, mapped in wells at 0.6 m (2 ft) resolution, and used to make section lines and isopach maps of similar electrofacies. Isopach maps and cross sections confirm the presence of the Sebree Trough across Ohio, with trends that parallel existing and projected basement structures. This suggests that the Sebree Trough in Ohio was a bathymetric low, which was, at least in part, controlled by reactivation of basement structures due to far-field Taconic stresses.

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Section: Late Ordovician Geologic Frameworkmentioning

confidence: 94%

Section: Stratigraphic Frameworkmentioning

confidence: 99%

Subsurface Relationships between the Sebree Trough and Carbonate-Siliciclastic Mixing in the Upper Ordovician Lexington-Trenton and Point Pleasant-Utica Intervals in Ohio, USA, using Multivariate Statistical Well Log Analysis

Bloxson

Saylor

Ettensohn

2022

OJS

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“…Schwalb (1980) first applied the name "Sebree Valley" to a northeast-southwest trending feature in western Kentucky that he described as a "trough-like, clastic filled depression." Other researchers used the term "Sebree trough" and extended this feature from western Kentucky through southeastern Indiana into northwestern Ohio (Bergström and Mitchell, 1987;Wickstrom, 1988;Mitchell and Bergström, 1991;Wickstrom, et al, 1992;Bergström and Mitchell, 1992;1994;Keith and Wickstrom, 1993;Bergström and Mitchell, 1994;Kolata, et al, 1996;Pope and Read, 1997;Hohman, 1998;Kolata, et al, 2001;Ettensohn, et al, 2002;Richardson and Bergström, 2003;Brett, et al, 2004;Ettensohn, et al, 2004;Ludvigson, et al, 2004;.…”

Section: Idealized Depositional Modelmentioning

confidence: 99%

Creating a Geologic Play Book for Trenton-Black River Appalachian Basin Exploration

Patchen¹,

Avary²,

Bocan³

et al. 2005

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The Trenton-Black River Appalachian Basin Research Consortium has made significant progress toward their goal of producing a geologic play book for the TrentonBlack River gas play. The final product will include a resource assessment model of Trenton-Black River reservoirs; possible fairways within which to concentrate further studies and seismic programs; and a model for the origin of Trenton-Black River hydrothermal dolomite reservoirs.All seismic data available to the consortium have been examined. Synthetic seismograms constructed for specific wells have enabled researchers to correlate the tops of 15 stratigraphic units determined from well logs to seismic profiles in New York, Pennsylvania, Ohio, West Virginia and Kentucky. In addition, three surfaces for the area have been depth converted, gridded and mapped. A 16-layer velocity model has been developed to help constrain time-to-depth conversions. Considerable progress was made in fault trend delineation and seismic-stratigraphic correlation within the project area.Isopach maps and a network of gamma-ray cross sections supplemented with core descriptions allowed researchers to more clearly define the architecture of the basin during Middle and Late Ordovician time, the control of basin architecture on carbonate and shale deposition and eventually, the location of reservoirs in Trenton Limestone and Black River Group carbonates. The basin architecture itself may be structurally controlled, and this fault-related structural control along platform margins influenced the formation of hydrothermal dolomite reservoirs in original limestone facies deposited in high energy environments. This resulted in productive trends along the northwest margin of the Trenton platform in Ohio. The continuation of this platform margin into New York should provide further areas with good exploration potential.The focus of the petrographic study shifted from cataloging a broad spectrum of carbonate rocks that occur in the Trenton-Black River interval to delineation of regional limestone diagenesis in the basin. A consistent basin-wide pattern of marine and burial diagenesis that resulted in relatively low porosity and permeability in the subtidal facies of these rocks has been documented across the study area. Six diagenetic stages have been recognized: four marine diagenesis stages and two burial diagenesis stages. This dominance of extensive marine and burial diagenesis yielded rocks with low reservoir potential, with the exception of fractured limestone and dolostone reservoirs. Commercial amounts of porosity, permeability and petroleum accumulation appear to be restricted to areas where secondary porosity developed in association with hydrothermal fluid flow along faults and fractures related to basement tectonics.A broad range of geochemical and fluid inclusion analyses have aided in a better understanding of the origin of the dolomites in the Trenton and Black River Groups over the study area. The results of these analyses support a hydrothermal origin for all of th...

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Using the Appalachian Superbasin as an analogue to the Permo-Carboniferous succession and petroleum-systems of the Barents Sea shelf

Martins

Ettensohn

Knutsen³

2022

Second International Meeting for Applied Geoscience &Amp; Energy

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Trenton Limestone -- The Karst That Wasn’t There, or Was It?

Cited by 4 publications

References 2 publications

Subsurface Relationships between the Sebree Trough and Carbonate-Siliciclastic Mixing in the Upper Ordovician Lexington-Trenton and Point Pleasant-Utica Intervals in Ohio, USA, using Multivariate Statistical Well Log Analysis

Subsurface Relationships between the Sebree Trough and Carbonate-Siliciclastic Mixing in the Upper Ordovician Lexington-Trenton and Point Pleasant-Utica Intervals in Ohio, USA, using Multivariate Statistical Well Log Analysis

Creating a Geologic Play Book for Trenton-Black River Appalachian Basin Exploration

Using the Appalachian Superbasin as an analogue to the Permo-Carboniferous succession and petroleum-systems of the Barents Sea shelf

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