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Long-term Variations of CO2 Trapped in Different Mechanisms in Deep Saline Formations: A Case Study of the Songliao Basin, China

Description: The geological storage of CO{sub 2} in deep saline formations is increasing seen as a viable strategy to reduce the release of greenhouse gases to the atmosphere. There are numerous sedimentary basins in China, in which a number of suitable CO{sub 2} geologic reservoirs are potentially available. To identify the multi-phase processes, geochemical changes and mineral alteration, and CO{sub 2} trapping mechanisms after CO{sub 2} injection, reactive geochemical transport simulations using a simple… more
Date: June 10, 2008
Creator: Zhang, Wei; Li, Yilian; Xu, Tianfu; Cheng, Huilin; Zheng, Yan & Xiong, Peng
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Analysis of Fracture in Cores from the Tuff Confining Unit beneath Yucca Flat, Nevada Test Site

Description: The role fractures play in the movement of groundwater through zeolitic tuffs that form the tuff confining unit (TCU) beneath Yucca Flat, Nevada Test Site, is poorly known. This is an important uncertainty, because beneath most of Yucca Flat the TCU lies between the sources of radionuclide contaminants produced by historic underground nuclear testing and the regional carbonate aquifer. To gain a better understanding of the role fractures play in the movement of groundwater and radionuclides thr… more
Date: March 1, 2008
Creator: Prothro, Lance
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Enhanced Geothermal Systems Research and Development: Models of Subsurface Chemical Processes Affecting Fluid Flow

Description: Successful exploitation of the vast amount of heat stored beneath the earth’s surface in hydrothermal and fluid-limited, low permeability geothermal resources would greatly expand the Nation’s domestic energy inventory and thereby promote a more secure energy supply, a stronger economy and a cleaner environment. However, a major factor limiting the expanded development of current hydrothermal resources as well as the production of enhanced geothermal systems (EGS) is insufficient knowledge abou… more
Date: May 29, 2008
Creator: Moller, Nancy & H., Weare J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

THERMODYNAMIC AND MASS BALANCE ANALYSIS OF EXPANSIVE PHASE PRECIPITATION IN SALTSTONE

Description: This report assesses the potential for future precipitation of expansive phases that could cause fracturing in saltstone. It examines the equilibrium case using The Geochemist's Workbench{reg_sign} reaction path model. The scenarios simulated examine the effects of different possible infiltrating fluids, different saltstone formulations, and different amounts of minerals available for reaction. Mineralogy of the vault cement and saltstone were estimated using reported chemical compositions of e… more
Date: May 6, 2008
Creator: Denham, M
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mining on Federal Lands: Hardrock Minerals

Description: This report discusses the mining of hardrock minerals on fedearl lands, which is governed by the claim-patent system under the General Mining Law of 1872. It gives an overview the issues involved with the current system, such as competing land uses, and discusses proposed legislation meant to reform the claim-patent system.
Date: April 30, 2008
Creator: Humphries, Marc
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Primary carbonatite melt from deeply subducted oceanic crust

Description: Partial melting in the Earth's mantle plays an important part in generating the geochemical and isotopic diversity observed in volcanic rocks at the surface. Identifying the composition of these primary melts in the mantle is crucial for establishing links between mantle geochemical 'reservoirs' and fundamental geodynamic processes. Mineral inclusions in natural diamonds have provided a unique window into such deep mantle processes. Here they provide exper8imental and geochemical evidence that … more
Date: July 1, 2008
Creator: Walter, M. J.; Bulanova, G. P.; Armstrong, L. S.; Keshav, S.; Blundy, J. D.; Gudfinnesson, G. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Monitoring Acidophilic Microbes with Real-Time Polymerase Chain Reaction (PCR) Assays

Description: Many techniques that are used to characterize and monitor microbial populations associated with sulfide mineral bioleaching require the cultivation of the organisms on solid or liquid media. Chemolithotrophic species, such as Acidithiobacillus ferrooxidans and Leptospirillum ferrooxidans, or thermophilic chemolithotrophs, such as Acidianus brierleyi and Sulfolobus solfataricus can grow quite slowly, requiring weeks to complete efforts to identify and quantify these microbes associated with biol… more
Date: August 1, 2008
Creator: Roberto, Frank F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Biogenic iron oxyhydroxide formation at mid-ocean ridge hydrothermal vents: Juan de Fuca Ridge

Description: Here we examine Fe speciation within Fe-encrusted biofilms formed during 2-month seafloor incubations of sulfide mineral assemblages at the Main Endeavor Segment of the Juan de Fuca Ridge. The biofilms were distributed heterogeneously across the surface of the incubated sulfide and composed primarily of particles with a twisted stalk morphology resembling those produced by some aerobic Fe-oxidizing microorganisms. Our objectives were to determine the form of biofilm-associated Fe, and identify … more
Date: May 22, 2008
Creator: Toner, Brandy M.; Santelli, Cara M.; Marcus, Matthew A.; Wirth, Richard; Chan, Clara S.; McCollom, Thomas et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Novel Approach to Experimental Studies of Mineral Dissolution Kinetics

Description: Currently, DOE is conducting pilot CO{sub 2} injection tests to evaluate the concept of geological sequestration. The injected CO{sub 2} is expected to react with the host rocks and these reactions can potentially alter the porosity, permeability, and mechanical properties of the host or cap rocks. Reactions can also result in precipitation of carbonate-containing minerals that favorably and permanently trap CO{sub 2} underground. Many numerical models have been used to predict these reactions … more
Date: August 31, 2008
Creator: Zhu, Chen
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Mississippian Leadville Limestone Exploration Play, Utah and Colorado-Exploration Techniques and Studies for Independents

Description: The Mississippian (late Kinderhookian to early Meramecian) Leadville Limestone is a shallow, open-marine, carbonate-shelf deposit. The Leadville has produced over 53 million barrels (8.4 million m{sup 3}) of oil/condensate from seven fields in the Paradox fold and fault belt of the Paradox Basin, Utah and Colorado. The environmentally sensitive, 7500-square-mile (19,400 km{sup 2}) area that makes up the fold and fault belt is relatively unexplored. Only independent producers operate and continu… more
Date: September 30, 2008
Creator: Chidsey, Thomas
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mineral-Surfactant Interactions for Minimum Reagents Precipitation and Adsorption for Improved Oil Recovery

Description: Chemical EOR can be an effective method for increasing oil recovery and reducing the amount of produced water; however, reservoir fluids are chemically complex and may react adversely to the polymers and surfactants injected into the reservoir. While a major goal is to alter rock wettability and interfacial tension between oil and water, rock-fluid and fluid-fluid interactions must be understood and controlled to minimize reagent loss, maximize recovery and mitigate costly failures. The overall… more
Date: September 20, 2008
Creator: Somasundaran, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evidence for the incorporation of lead into barite from waste rock pile materials

Description: Because Pb is one of the most toxic elements and is found as a major contaminant in mining environments, this study aims to identify the distribution of this element in host phases issued from the alteration of mine wastes. The sampling location was a former mine near Oakland, California (USA). This mine was once a source of sulfide minerals from which sulfuric acid was made. The material discussed in this paper was collected in iron hardpans that were formed within the waste rock pile resultin… more
Date: January 21, 2008
Creator: COURTIN-NOMADE, ALEXANDRA; SOUBRAND-COLIN, MARILYNE; MARCUS, MATTHEW A. & FAKRA, SIRINE .C
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Abiotic Degradation Rates for Carbon Tetrachloride: and Chloroform: Progress in FY 2008

Description: This is a letter report summarizing work performed in FY2008 to determine the rates of carbon tetrachloride hydrolysis at temperatures close to actual groundwater temperatures. The report describes the project, the methodology, and the results obtained since the project's inception in FY2006. Measurements of hydrolysis rates in homogeneous solution have been completed for temperaturs of 70 C through 40 C, with additional data available at 30 C and 20 C. These results show no difference between … more
Date: October 31, 2008
Creator: Amonette, James E.; Jeffers, Peter M.; Qafoku, Odeta; Russell, Colleen K.; Wietsma, Thomas W. & Truex, Michael J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Minerals Price Increases and Volatility: Causes and Consequences

Description: This report discusses China's efforts to improve and increase its access to foreign mineral resources, which may have the effect of raising prices for U.S. domestic industrial users. The report examines in detail the relationship between prices, production, and availability of selected metal minerals essential to the U.S. economy. It focuses on iron ore, aluminum (bauxite/alumina), copper, manganese, molybdenum (moly), zinc, platinum group metals (PGMs), and uranium.
Date: October 3, 2008
Creator: Cooney, Stephen; Pirog, Robert; Folger, Peter; Humphries, Marc & Nanto, Dick K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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