Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Carbonate rock"”.
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Carbonate rock-water diagenesis lower cretaceous, Stuart City Trend, South Texas
… shelf-edge buildup of bioclastic and reefal carbonates. This carbonate system is currently buried to depths of between 3,300 and 5,000 meters. Combined with the equivalent updip shallow water, shelf carbonates of the Edwards and Glen Rose Formations, these carbonates form an extensive …
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Patterns of distal alteration zonation around Antamina Cu-Zn skarn and Uchucchacua Ag-base metal vein deposits, Peru : mineralogical, chemical and isotopic evidence for fluid composition, and infiltration, and implications for mineral exploration
Intrusion-related, carbonate rock–hosted replacement deposits are an important source of global base metal production that includes: Cu-Zn skarn, Zn-Pb-Ag carbonate replacement and Ag-base metal deposits. These deposits are located in multiple geological settings and are commonly associated with …
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Physical Optimization of Acid Fracturing with Unified Fracture Design
… Acid fracturing is used mainly to stimulate carbonate rock. This technique has certain advantages over conventional fracturing. There is no proppant used, therefore the risk of screenout is nullified. There are also logistic reasons such as transport of proppant, which might make acid …
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Hydrogeology and hydrogeochemistry of the Spring Mountains, Clark County, Nevada
… study area is controlled by the predominance of carbonate rock in the central portion of the mountain block. Modeling of {dollar}\delta\sp{13}{dollar}C in ground water suggest low P{dollar}\sb{\rm CO\sb2}{dollar} and enriched {dollar}\delta\sp{13}{dollar}C in soil, and open system conditions at …
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Characteristics of cone-forming cyanobacteria and implications for the origin of conical stromatolites
… which are composed of laminated and lithified carbonate rock, may contain the earliest records of phototaxis, photosynthesis, and oxygenation of the environment. The reconstruction of the co-evolution of biology and the environment using stromatolites depends on the ability to recognize …
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Digital Rock: Understanding the mechanism of Enhanced Oil Recovery (EOR) Core Floods
… through one sandstone and three low-permeability carbonate core plugs. Interesting observations were derived for flow velocities below 15 ft d-1 in these complex pore structures. After detecting ultra-slow flows through rocks, the research focused on the study of two-phase systems. A novel MRI …
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Hydrogeology of the Penoyer Valley region, Central Nevada
… connected. This connection is facilitated by carbonate rock formations found in the Worthington Mountains and the Timpahute Range, located on the eastern and southern perimeter of Penoyer Valley. Although Penoyer Valley and Garden Valley are hydraulically connected, it is likely that …
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Caprock integrity evaluation for geosequestration of CO2 in depleted petroleum reservoirs.
… could force some amount of CO2 into the caprock, thereby altering the petrophysical and geochemical properties of the caprock. Also, CO2-brine-rock interactions during CO2 geosequestration can impact the brittleness of the formations due to changes in their mineralogical compositions during …
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Nanoparticles for Oil Dispersants and Nano Tracers
… charged carbon nanoparticles in porous rock cores was also examined using single phase core flooding experiments and 1-dimesional convection-dispersion equation. Temperature dependence of transport parameters such as dispersion coefficients and retardation factors were evaluated. The …
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Petrology of the basal middle Ordovician Blackford formation of the type belt, Russell County, Virginia
… of the area studied consists of dominantly carbonate rocks deposited in a shallow sea which transgressed on a subaerially eroded carbonate terrane having up to 110 feet of relief locally. The lower two-thirds was deposited in a generally supratidal environment and grades up into rocks …
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Hydrologic and Geochemical Cycling within Karst Versus Non-Karst Basins within the Interior Low Plateau Province of South-Central Kentucky
… Mammoth Cave National Park. Twelve percent carbonate rocks underlie one basin, while the other consists of 48 percent carbonate rocks. The carbonate rock exposures within both basins exhibit karstification. The hydrologic and geochemical differences between these basins were compared to …
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Integrated geological and petrophysical investigation on carbonate rocks of the middle early to late early Canyon high frequency sequence in the Northern Platform area of the SACROC Unit
The SACROC unit is an isolated carbonate platform style of reservoir that typifies a peak icehouse system. Icehouse carbonate platforms are one of the least well understood and documented carbonate reservoir styles due to the reservoir heterogeneities they embody. The current study is an attempt to …
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Time and process in sedimentary rocks at the dawn of animal life
… organisms with tissues. Sedimentary rocks record this evolutionary event, alongside other shifts in environment and climate, in fragmentary form. Sedimentological studies track change in space and relative time, and radiometric studies allow us to tie events to absolute time. Both are …
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Analysis of Sinkhole Susceptibility and Karst Distribution in the Northern Shenandoah Valley, Virginia: Implications for Low Impact Development (LID) Site Suitability Models
… groundwater quality and the stability of the bedrock. In 2004 the Center for Geospatial Information Technology (CGIT) at Virginia Tech developed an LID site suitability model for the NSV region incorporating karst as a key component in distinguishing unsuitable from suitable conditions for LID. …
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Multiphase flow in porous media with phase transitions : from CO₂ sequestration to gas hydrate systems
… in saline aquifers in the presence of CO₂ -brine-carbonate geochemical reactions. We use high-resolution simulations to examine the interplay between the density-driven convective mixing and the rock dissolution reactions. We find that dissolution of carbonate rock initiates in regions of locally …
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Assessment of alkali aggregate reaction avoidance measures and alkali aggregate reaction tests worldwide
… (ASR), Alkali-Silicate Reaction and Alkali-Carbonate Rock Reaction (ACR). Since AAR is a type of internal chemical damage to concrete, it can be avoided by engineering design and by carefully selecting the concrete construction materials. In order for damaging AAR to occur in concrete, the …
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Rates and dates: Evaluating rhythmicity and cyclicity in sedimentary and biomineral records
… (i.e. Milankovitch cycles) can be tested in the rock record. In order to distinguish these patterns, computer generated carbonate rock records were simulated with the resulting outcrops tested using common methods. These simulations were built upon eustatic sea level fluctuations with periods …
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The igneous petrology, thermal history, and genesis of sedimentary rock-hosted Au deposits in the northern Battle Mountain mining district, Nevada
… disseminated deposits, as well as sedimentary-rock hosted Au deposits of uncertain origin. This dissertation examines the ages of magmatism and mineralization in the Battle Mountain mining district, the characteristics of hypogene sedimentary rock-hosted Au mineralization at the deposit scale, …
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Depositional constraints on lacustrine carbonates from the Winnemucca Dry Lake Basin, Nevada, USA
<p>Carbonate mineral formation in lakes is a consequence of the interactions of lake water chemistry, physical processes at several scales, and biological influences, all of which are greatly affected by individual lake basin attributes such as basin size and physiography, bedrock geology, …
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Assessing the Reliability of Integrating global data with the GEOframe-NewAGE hydrological model
… that effective modeling solutions for complex carbonate basins can be implemented even with limited data availability. Given the vulnerability of these basins to drought and climate change, exploring alternative modeling approaches under such data constraints is crucial. A hybrid method …
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