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Preliminary Efforts to Couple TETRAD with Geophysics Models

Description: The Geothermal Program at the Idaho National Engineering and Environmental Laboratory is enhancing our reservoir simulation capabilities by writing new subroutines with TETRAD that write necessary files for use with SAIC's geophysics models, including DC Resistivity, SP, and microgravity. This is part of long-term efforts to develop reservoir models that take advantage of various observations that are - or can be - made on both existing fields or during exploration efforts. These new routines will be made available to the TETRAD user community in 2002 through the next release of TETRAD 2002.
Date: January 1, 2002
Creator: Shook, George Michael; Renner, Joel Lawrence & Bloomfield, Kevin Kit
Partner: UNT Libraries Government Documents Department

Fall 2007 American Geophysical Union Meeting Student Travel Support for Environmental Nanomaterials Session (#B35) (December 10-14, 2007)

Description: The purpose of award no. DE-FG02-08ER15925 was to fund travel for students to present at the Fall 2007 American Geophysical Meeting. This was done successfully, and five students (Bin Xie, Qiaona Hu, Katie Schreiner, Daria Kibanova, and Frank-Andreas Weber) gave excellent oral and poster presentations at the meeting. Provided are the conference abstracts for their presentations.
Date: October 1, 2007
Creator: Michael F. Hochella, Jr.
Partner: UNT Libraries Government Documents Department

Additional Physical Property Data, U12g.01 Tunnel, Nevada Test Site, Nye County, Nev.

Description: Introduction: "This report presents physical property analyses for 28 additional samples and is a supplement to Geological Survey Technical Letter: Area-12-1, which gave a brief summary of the geology, descriptive data on the tunnel, and X-ray, chemical, semiquantitative spectrographic analyses, and some physical properties determinations of samples collected in the U12g.01 tunnel."
Date: October 5, 1962
Creator: Emerick, W. L.; Snyder, R. F. & Hoover, D. L.
Partner: UNT Libraries Government Documents Department

Borehole Data-Collection Methods Applicable for the Regional Observation and Monitor Well Program, Southwest Florida Water Management District

Description: From introduction: This report presents some borehole data-collection methods that can be used during the drilling of ROMP or other wells where data collection is a prime objective. Hydraulic, water-quality, and geophysical data-collection methods applicable to the hydrogeology of west-central Florida are emphasized.
Date: September 1981
Creator: Hickey, John J.
Partner: UNT Libraries Government Documents Department

Improved characterization through joint hydrogeophysical inversion: Examples of three different approaches

Description: With the increasing application of geophysical methods to hydrogeological problems, approaches for obtaining quantitative estimates of hydrogeological parameters using geophysical data are in great demand. A common approach to hydrogeological parameter estimation using geophysical and hydrogeological data is to first invert the geophysical data using a geophysical inversion procedure, and subsequently use the resulting estimates together with available hydrogeological information to estimate a hydrogeological parameter field. This approach does not allow us to constrain the geophysical inversion by hydrogeological data and prior information, and thus decreases our ability to make valid estimates of the hydrogeological parameter field. Furthermore, it is difficult to quantify the uncertainty in the corresponding estimates and to validate the assumptions made. They are developing alternative approaches that allow for the joint inversion of all available hydrological and geophysical data. In this presentation, they consider three studies and draw various conclusions, such as on the potential benefits of estimating the petrophysical relationships within the inversion framework and of constraining the geophysical estimates on geophysical, as well as hydrogeological data.
Date: July 1, 2004
Creator: Linde, Niklas; Chen, Jinsong; Kowalsky, Michael; Finsterle,Stefan; Rubin, Yoram & Hubbard, Susan
Partner: UNT Libraries Government Documents Department

Assessing non-uniqueness: An algebraic approach

Description: Geophysical inverse problems are endowed with a rich mathematical structure. When discretized, most differential and integral equations of interest are algebraic (polynomial) in form. Techniques from algebraic geometry and computational algebra provide a means to address questions of existence and uniqueness for both linear and non-linear inverse problem. In a sense, the methods extend ideas which have proven fruitful in treating linear inverse problems.
Date: September 16, 2002
Creator: Vasco, Don W.
Partner: UNT Libraries Government Documents Department

Summaries of FY 1995 geosciences research

Description: The summaries in this document, prepared by the investigators, describe the scope of the individual programs. The Geosciences Research Program includes research in geophysics, geochemistry, resource evaluation, solar-terrestrial interactions, and their subdivisions including earth dynamics, properties of earth materials, rock mechanics, underground imaging, rock-fluid interactions, continental scientific drilling, geochemical transport, solar/atmospheric physics, and modeling, with emphasis on the interdisciplinary areas. All such research is related either direct or indirect to the Department of Energy`s long-range technological needs.
Date: December 1, 1995
Partner: UNT Libraries Government Documents Department

Seismic Determination of Reservoir Heterogeneity: Application to the Characterization of Heavy Oil Reservoirs

Description: The objective of the project was to examine how seismic and geologic data can be used to improve characterization of small-scale heterogeneity and their parameterization in reservoir models. The study focused on West Coalinga Field in California. The project initially attempted to build reservoir models based on different geologic and geophysical data independently using different tools, then to compare the results, and ultimately to integrate them all. We learned, however, that this strategy was impractical. The different data and tools need to be integrated from the beginning because they are all interrelated. This report describes a new approach to geostatistical modeling and presents an integration of geology and geophysics to explain the formation of the complex Coalinga reservoir.
Date: February 1, 2005
Creator: Imhof, Matthias G. & Castle, James W.
Partner: UNT Libraries Government Documents Department

Geological and Geophysical Survey of Fluorspar Areas in Hardin County, Illinois

Description: From abstract: Pt 1. The present work seems to confirm the genetic theory previously published, namely that [Illinois Cave in Rock] deposits were formed by ascending solutions. These solutions probably followed minor fissures that connected below with larger fissures, which in turn probably connected with a major fault zone. It is believed that where such minor fissures extended upward only to the shale or other impervious cap rock, or were greatly reduced in size where they penetrated such beds, the solutions spread laterally along the contact and along the limestone beds beneath it and replaced the limestone. Pt 2. This report is a presentation of the results of an electrical-resistivity survey conducted in the fluorspar-bearing areas of Hardin County, Ill., principally during the field seasons of 1934 and 1935.
Date: 1944
Creator: Currier, Louis W.; Wagner, Oscar Emil, Jr. & Hubbert, M. King
Partner: UNT Libraries Government Documents Department

Crustal structure of China and adjacent areas: a final report of the detailed compilation of data and results

Description: In geophysical terms, China is a ''data rich'' country. However it is often very difficult for Western scientists to access the available information or identify individuals responsible for program development. The USGS has largely bypassed this bottleneck by virtue of more than two decades of collaborative research based on an official Protocol Agreement.
Date: June 4, 1998
Creator: Mooney, W D
Partner: UNT Libraries Government Documents Department

Input to the NSF Study on Computational Requirements in Geosciences

Description: The Computational Physics Group of the Earth Sciences Division focuses much of its effort on improving current understanding of the response of geologic media to strong shock waves, and on the interaction of those waves with underground structures. Two codes have been developed and used to achieve these objectives: LDEC and GEODYN. Both codes are three-dimensional and massively parallel, and they have both been used on LLNLs high performance computing platforms to advance the state of the art in computational geophysics.
Date: December 13, 2004
Creator: Antoun, T; Lomov, I & Morris, J
Partner: UNT Libraries Government Documents Department

The Use of Radar Methods to Determine Moisture Content in the Vadose Zone

Description: Water content is a critical parameter affecting both liquid-phase and vapor-phase contaminant transport in the vadose zone. This means that accurate estimates of in situ water content must be obtained in order to design for the appropriate handling or remediation of a contaminated region of the vadose zone. Traditional methods of sampling the subsurface by drilling and/or direct sampling are very time consuming, limited in terms of spatial coverage, and have the associated risk of contacting and increasing the size of the contaminated area. One solution is to use geophysical methods which can provide a high-resolution, non-invasive means of sampling or imaging the subsurface. The overall objective of our research, defined at the start of this project, was to advance the usefulness of radar methods (ground-based and borehole) as a means of characterizing water content in the vadose zone. We have met this objective by providing research results that can be used to (1) improve the accuracy of water content estimates from radar measurements; (2) provide estimates of the potential error in water content estimates from radar measurements; (3) improve the clarity of radar images; (4) develop large-scale models of the subsurface ''architecture'' using radar images; (5) develop ways of quantifying the spatial heterogeneity of the subsurface through analysis of radar images. We have also been able to identify the critical areas where more research is needed in order to be able to use radar methods most effectively as an accurate means of subsurface characterization.
Date: December 28, 2003
Creator: Knight, Rosemary
Partner: UNT Libraries Government Documents Department

Geochemical Controls on Nuclear Magnetic Resonance Measurements

Description: OAK-B135 Our research objectives are to determine, through an extensive set of laboratory experiments, the effect of the specific mineralogic form of iron and the effect of the distribution of iron on proton nuclear magnetic resonance (NMR) relaxation mechanisms. In the first nine months of this project, we have refined the experimental procedures to be used in the acquisition of the laboratory NMR data; have ordered, and conducted preliminary measurements on, the sand samples to be used in the experimental work; and have revised and completed the theoretical model to use in this project. Over the next year, our focus will be on completing the first phase of the experimental work where the form and distribution of the iron in the sands in varied.
Date: November 11, 2003
Creator: Knight, Rosemary; Prasad, Manika & Keating, Kristina
Partner: UNT Libraries Government Documents Department

A Strategy for Monitoring of Geologic Sequestration of CO2

Description: Monitoring of geologic sequestration projects will require the measurement of many different parameters and processes at many different locations at the surface and in the subsurface. The greatest need for technology development is for monitoring of processes in the subsurface in the region between wells. The approach to fitting this need is to build upon decades of experience in use of geophysics in the oil and gas industry. These methods can be optimized for CO2 monitoring, and customized and extended in order to meet the need for cost-effective methods applicable to saline disposal sites, coal bed methane sites, as well as oil and gas reservoir sequestration sites. The strategy for development of cost-effective methods follows a three step iterative process of sensitivity analysis using numerical and experimental techniques, field testing at a range of scale in different formations, and analysis and integration of complimentary types of data.
Date: April 17, 2000
Creator: Myer, Larry R.
Partner: UNT Libraries Government Documents Department