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Showing 1 to 20 of 34 for “"Niobrara"”.
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Faults and fractures in the Niobrara Formation of Wattenberg field, Colorado
… log fractures are consistently found in both the Niobrara chalk and marl benches. The individual benches are not resolvable at the scale of the seismic data, but evidence that faults are present in both the chalks and marls lends credence to the potential that seismic data may be able to predict …
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Benthonic foraminiferida of the Niobrara formation (Upper Cretaceous) at Pueblo, Colorado
Includes bibliographical references.
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Population Dynamics of Threatened Piping Plovers on the Niobrara River, Nebraska
… and quality, as well as river flow. The Niobrara River in northern Nebraska has supported 22–41% of the state’s plovers since species listing in 1986, but the population and habitat are relatively understudied, and both have declined since 2010. The objectives of this study were to …
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Biogenic gas occurrence in the Niobrara Formation, eastern Denver Basin, Colorado, USA
… field, which produces biogenic gas from the Niobrara Formation in the eastern part of the Denver Basin. The petroleum system of the biogenic play in the eastern part of the Denver Basin is a proven system. The maturity data are from high TOC marl intervals in the Niobrara Formation and …
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3-D seismic characterization of the Niobrara Formation, Silo field, Laramie County, Wyoming
… northeast of Cheyenne, Wyoming, is an important Niobrara oil field. The field produces from open, vertical, natural fractures that trend northwest-southeast across the field. Several proposed ideas for fracture genesis include: differential compaction or folding over basement highs, proximity to …
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Predictions of produced water quality and quantity for spatially-distributed wells in Niobrara formation
Two main problems facing the oil and gas industry are the availability of water for well construction and disposal of the produced water. Produced water is typically only treated for a limited number of constituents, and common disposal options have been deep well injection, evaporation or …
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Litho- and Biostratigraphic analysis of the Upper Cretaceous Carlile and Niobrara formations in southern Saskatchewan, Canada
The Carlile and Niobrara formations were deposited during the regressive phase of the Greenhorn cycle and the transgressive phase of the Niobrara cycle (early Turonian-late Santonian). The lateral distribution of these units was controlled by eustatic sea level changes and differential …
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Origin and distribution of selenium in the upper Cretaceous Niobrara and Pierre formations, northeastern North Dakota
… in the bentonitic zones near the contact of the Niobrara and Pierre Formations of Cretaceous age in northeastern North Dakota. A 64-foot section in the Pembina Hills area reveals that the highest selenium content occurs in shale and marlstone beds adjacent to the bentonite beds which, themselves, …
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Microbial analysis of the Niobrara formation for microbial enhanced oil recovery (MEOR) and contaminant tracing applications
Includes bibliographical references (pages 81-83).
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Mechanical stratigraphy and sonic log relationships using the Proceq Bambino in the Niobrara Formation, Denver Basin
… velocity. Preliminary data was taken from the Niobrara Formation in a Denver Basin core to demonstrate the repeatability, precision, and non-destructiveness of the Bambino. A relationship between HLD values and geomechanical properties such as unconfined compressive strength, Young's modulus, …
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Study of the organic content and mineralogy effects on the acoustic properties of the Niobrara Formation, Denver Basin
… of unconventional gas and oil production from Niobrara chalk and marl intervals across the Greater Wattenberg Area (GWA). The Niobrara carbonate system in the Denver Basin contains a TOC range of 1-8 wt.%. Additionally, GWA is associated with a geothermal anomaly. This study investigates the …
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Diagenesis of the B chalk, B marl, and Fort Hays member of the Niobrara Formation, Denver Basin, Colorado
… the B chalk, B marl and Fort Hays Member of the Niobrara Formation, in eight cores and one outcrop sample, revealed that progressive diagenetic alteration occurred with increasing burial depth and increasing temperatures. Cathodoluminescence petrography, scanning electron microscopy, geothermal …
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Paleontology and stratigraphy of the Niobrara Formation (Upper Cretaceous) of eastern North Dakota with emphasis on the calcareous nannoplankton
<p>The Upper Cretaceous Niobrara Formation in eastern North Dakota consists of calcareous shales, chalks, and shaly chalks. The formation was studied from surface exposures, cores, and well logs. The Niobrara is 62 feet (19m) to 272 feet (83 m) and is thickest to the northeast, in a central linear …
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Establishing an unambiguous connection between grain size and style of sediment transport in the Lower Niobrara River, Nebraska, USA
… mode. Application of this method to the Niobrara River, Nebraska, shows that -80 % of the sediment is traveling as suspended load, ~ 20 % is traveling in a transitional mode between bedload and suspended load and less than 1 % is traveling as pure bedload. We establish an unambiguous …
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3D modeling and characterization of hydraulic fracture efficiency integrated with 4D/9C time-lapse seismic interpretations in the Niobrara Formation, Wattenberg field, Denver Basin
Hydrocarbon recovery rates within the Niobrara Shale are estimated as low as 2-8%. These recovery rates are controlled by the ability to effectively hydraulic fracture stimulate the reservoir using multistage horizontal wells. Subsequent to any mechanical issues that affect production from lateral …
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Distribution, Productivity, and Habitat Use by Interior Least Terns and Piping Plovers on the Niobrara River in Northern Nebraska, 1996-1997
… population declines throughout their range. The Niobrara River in Nebraska is one of the least modified rivers in the northern Great Plains that currently supports breeding populations of least terns and piping plovers. Nesting sites were identified and various nest site parameters were measured. …
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Electron Donor Potential of Eastern North Dakota Shale Formations
… but the other formations tested, the Niobrara, Carlile, and Greenhorn, contain higher concentrations of e- donors. </p><p> Organic carbon concentrations in the Pierre (0.3% to 0.7%) are relatively low while concentrations in the Niobrara (-2.9%) and Greenhorn (-3.7%) are significantly …
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Faulting and natural fracturing across the DJ Basin: impacts on production from Hereford field, northern Colorado
… with good reason. The natural fractures in the Niobrara formation, specifically in the Niobrara B Chalk, have been the driving mechanism behind the production from this low-porosity, low-permeability reservoir; without which, it may not be a viable play. Therefore, understanding the controls on …
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Fluid flow and deformation history of the Denver basin, CO region: fluid inclusions, U-Pb geochronology and isotope geochemistry of calcite-filled fracture cements in the Niobrara Formation
… analysis of fracture-filling cements in the Niobrara Formation with the integration of petrographic and geochemical analyses including: LA-ICP-MS U-Pb geochronology, fluid inclusion microthermometry, stable isotope, and strontium isotope analysis. Samples were obtained from the Albert Kurtz …
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Stratigraphy and paleontology of the upper Cretaceous Morden Member (Vermilion River Formation) in the outcrop area, northeastern North Dakota
… the Greenhorn Formation and underlies the Niobrara Formation. The Canadian Morden Member of the Vermilion River Formation is used in lieu of the Carlile Formation because of the lithologic similarity and proximity to the Morden type area, and the distance from the Carlile Formation type …
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