Facies Belts, Microfacies, and Karst Features of the Ellenburger Group, Kerr Basin, Texas: Observations Based on Cores
Richard C. Geesaman, James Lee Wilson, 2012. "Facies Belts, Microfacies, and Karst Features of the Ellenburger Group, Kerr Basin, Texas: Observations Based on Cores", Great American Carbonate Bank: The Geology and Economic Resources of the Cambrian—Ordovician Sauk Megasequence of Laurentia, James Derby, Richard Fritz, Susan Longacre, William Morgan, Charles Sternbach
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The carbonate-dominated strata of the Lower Ordovician Ellenburger Group have an excellent potential for containing significant reserves of hydrocarbons in the sparsely explored Kerr Basin of southwestern Texas. The Kerr Basin is located east of and adjacent to the Val Verde Basin and is characterized by asimilar tectonic history and resultant structural style. Moreover, the Ellenburger strata in the Kerr Basin consist of numerous stacked upward-shallowing parasequences similar to those making up the Ellenburger Groupin the Val Verde Basin. Karst-related dissolution and collapse overprint much of the Ellenburger carbonates, locally resulting in porous breccias, cave fill, and/or fractured cave roofs. In summary, the Ellenburger strata of the Kerr Basin were deposited in similar environments, are composed of the same lithologic components, and have been exposed to similar diagenetic processes as equivalent strata in the adjacent Val Verde Basin. Therefore, a strong likelihood exists that reservoir-quality porosity and permeability will be preserved in the subsurface and that these reservoirs will be hydrocarbon productive in structural closures in this frontier basin.
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Great American Carbonate Bank: The Geology and Economic Resources of the Cambrian—Ordovician Sauk Megasequence of Laurentia
The Great American Carbonate Bank (GACB) comprises the carbonates (and related siliciclastics) of the Sauk megasequence, which were deposited on and around the Laurentian continent during Cambrian through earliest Middle Ordovician, forming one of the largest carbonate-dominated platforms of the Phanerozoic. The Sauk megasequence, which ranges upwards of several thousand meters thick along the Bank's margin, consists of distinctive Lithofacies and fauna that are widely recognized throughout Laurentia. A refined biostratigraphic zonation forms the chronostratigraphic framework for correlating disparate outcrops and subsurface data, providing the basis for interpreting depositional patterns and the evolution of the Bank. GACB hydrocarbon fields have produced 4 BBO and 21 TCFG, mostly from reservoirs near the Sauk-Tippecanoe unconformity. The GACB is also a source of economic minerals and construction material and, locally, serves as either an aquifer or repository for injection of waste material. This Memoir comprises works on biostratigraphy, ichnology, stratigraphy, depositional facies, diagenesis, and petroleum and mineral resources of the GACB. It is dedicated to James Lee Wilson who first conceived of this publication and who worked on many aspects of the GACB during his long and illustrious career.