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Showing 1 to 14 of 14 for “"Mancos"”.
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Outcrop to subsurface stratigraphic analysis of the Juana Lopez member of the Mancos Shale, northwestern CO, U.S.A.
The Turonian Juana Lopez Member of the Mancos Shale in northwestern Colorado is a calcareous, bioclastic sandstone interbedded with organic-rich shale. Facies analysis of core and outcrops across northwestern Colorado indicates the presence of proximal, sand-prone facies to the north and distal, …
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Contact metamorphism of the Mancos shale: impacts on solute release and weatherability in the East River Valley, Gothic, CO
… differences in solute release rates from Mancos shale samples as a function of degree of metamorphism. Variable contact metamorphism of Mancos shale bedrock in the East River provides a natural test bed to investigate the role of underlying geology on weathering susceptibility, solute …
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Organic and inorganic geochemical characterization of the Juana Lopez and Montezuma Valley members of the lower Mancos Shale, Piceance Basin, Colorado
… members (and their coeval equivalents) of the Mancos Shale are beginning to receive some attention with regards to their petroleum potential as possible targets for unconventional exploration and production. However, minimal research has been completed on the Montezuma Valley Member, in …
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A stable isotope investigation of nitrate contamination at Many Devils Wash, Shiprock UMTRCA Site, Shiprock, NM
… steeply incised through terrain dominated by Mancos Shale, located approximately 0.2 miles east of the terrace area, terminating in the San Juan River. Elevated levels of the same constituents present in the terrace groundwater system are present in surface and ground waters of MDW. However, …
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The effect of fracture orientation on permeability
… considered using different shale samples from Mancos and Marcellus. To determine their permeability, these samples were induced with fractures at different orientation angles and tested at an overburden pressure of between 100 and 200 bar using a Nano-Perm machine. Computerised Tomography (CT) …
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Characterization of anisotropy in organic-rich shales: shear and tensile failure, wave velocity, matrix and fracture permeability
… However, the compressive strength of Mancos and Green River shales at various lamination angles show dependency on lamination angle. It was found that the Mancos shale has the weakest compressive strength at the lamination angle of 60°. Moreover, the post-failure radial gauge recording …
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Analytical Modeling and Diagnosis of Penetration Rate Performance of PDC Bits
… balling. Global balling when drilling both Mancos and Catoosa shales with OBM caused significant decreases in ROP and had essentially the same diagnostic symptoms as balling in WBM. This may indicate that the causal mechanisms of bit balling, and consequently, of slow ROP, in oil base mud …
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High Resolution Facies & Architectural Analysis of a Tributive, Basal Terrace of a Ferron Compound Incised Valley
The Ferron Sandstone Member of the Cretaceous Mancos Shale is composed of three fluvio-deltaic wedges deposited during the Turonian age along the western margin of the Cretaceous Seaway. The Notom Delta, southernmost of the three complexes, is spectacularly exposed in the washes, road cuts, and …
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Unresolved Problems Involving the Hydrogeology and Sequence Stratigraphy of the Wasatch Plateau based on Mapping of the Wattis 7.5 Minute Quadrangle, Carbon and Emery Counties, Utah: Insights Gained from a New Geologic Map
… Orogeny. The Emery Sandstone Member of the Mancos Formation contains three parasequences all located in the lower shoreface, and also exhibits the normal marine biota of <em>Skolithos</em> and <em>Ophiomorpha</em>. The Emery Sandstone reflects density currents caused by major storm events, …
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Stress- and direction-dependent analysis of elastic and petrophysical properties, and texture in unconventional rocks
… data from the Berea, Bakken, Three Forks, and Mancos formations were analyzed using the anisotropy template. The anisotropy template allows the user to (a) understand the causal mechanisms for seismic anisotropy, (b) understand the occurrence of non-uniform deformation due to change in stress, …
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Depositional system and source rock potential of the Sharon Springs Formation in Colorado
… within the Prairie Canyon Member of the Mancos, between the more proximal sandstones and basinal shales. This biostratigraphic and lithostratigraphic succession of facies presents a strong argument for a connection of the depositional system in eastern Colorado to the prograding units in …
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Controls on deposition, lithologic variability, and reservoir heterogeneity of prolific western interior shelf sandstone reservoirs: Tocito and El Vado sandstones, San Juan Basin, NM
The Tocito and El Vado Sandstones have proven to be highly prolific hydrocarbon reservoirs in the largest domestic onshore conventional gas basin in the U.S., the San Juan Basin (SJB). Application of modern drilling technology and favorable petroleum commodity prices have resulted in increased …