Show simple item record Comer, John B. 2008-12-06T10:43:30Z 2008-12-06T10:43:30Z 2008-04
dc.description This poster was presented at the 2008 Annual Convention and Exhibition of the American Association of Petroleum Geologists (AAPG) in San Antonio, Texas, from April 20-23, 2008. John B. Comer won an AAPG Award of Excellence "Top 10" Poster Presentation for the poster. en
dc.description.abstract Woodford Shale (Givetian to Kinderhookian) is a prolific hydrocarbon source rock in the southern USA Midcontinent and is locally an unconventional oil and gas reservoir. Woodford sediments were deposited in epeiric seas as anaerobic and dysaerobic biofacies recording widespread bottom-water anoxia and strongly density-stratified water columns. High concentrations of marine organic matter coexist with abundant biogenic silica, indicating that high biological productivity in surface waters was supported by dynamic upwelling. Hypersalinity, recorded as anhydrite in burrows and syneresis cracks, suggests an arid paleoclimate and indicates that density stratification was due in part to accumulation of hypersaline bottom water. Plate-tectonic reconstructions consistent with an arid paleoclimate and dynamic upwelling place this region on the western passive continental margin of North America in the dry tropics near 15 degrees south latitude. Here, southeasterly trade winds and Ekman circulation force surface water westward toward the open ocean and countercurrents with upwelled oceanic water eastward onto the craton. The strong net flow of ocean water into the epeiric seas developed because of the high rate of evaporation during a period of eustatic sea level rise. Transgressive system tracts along west-facing, arid passive continental margins produce marine source rocks because of the steady influx of upwelled oceanic nutrients, which support high biologic productivity, strongly density-stratified water columns that inhibit oxygen re-supply and promote organic matter preservation, and absence of significant rainfall, which precludes large river discharge and minimizes influx of terrestrially derived clastic sediments. en
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dc.language.iso en_US en
dc.rights This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License. To view a copy of this license, visit or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA. en
dc.rights.uri en
dc.subject Woodford en
dc.subject Woodford Shale en
dc.subject Devonian en
dc.subject Devonian shale en
dc.subject Devonian black shale en
dc.subject gas shale en
dc.subject Oklahoma en
dc.subject Texas en
dc.subject Arkansas en
dc.subject New Mexico en
dc.subject Southern midcontinent en
dc.subject source rock en
dc.subject petroleum source rock en
dc.subject petrology en
dc.subject shale petrology en
dc.subject sedimentation en
dc.subject shale sedimentation en
dc.subject depositional environment en
dc.subject black shale en
dc.subject unconventional reservoir en
dc.subject shale gas reservoir en
dc.subject fractured reservoir en
dc.subject shale en
dc.subject sedimentary rocks en
dc.subject organic geochemistry en
dc.subject thermal maturity en
dc.subject organic carbon en
dc.subject paleogeography en
dc.subject depositional setting en
dc.subject paleoceanography en
dc.subject paleoclimate en
dc.subject depositional processes en
dc.subject paleocirculation en
dc.subject continental margin en
dc.subject epeiric sea en
dc.subject cratonic basin en
dc.subject organic carbon en
dc.subject production potential en
dc.subject upwelling en
dc.subject marine transgression en
dc.subject sea level rise en
dc.subject eustasy en
dc.subject hypersalinity en
dc.subject silica diagenesis en
dc.subject Radiolaria en
dc.subject Tasmanites en
dc.subject sedimentary structures en
dc.subject laminae en
dc.subject organic productivity en
dc.subject storm sedimentation en
dc.title Woodford Shale in Southern Midcontinent, USA - Transgressive System Tract Marine Source Rocks on an Arid Passive Continental Margin with Persistent Oceanic Upwelling en
dc.type Presentation en

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