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in subjects: "150301 -- Geothermal Exploration & Exploration Technology-- Geophysical Techniques & Surveys"  
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Use of a General Nonlinear Least-Squares Curve Fitting Program With Nonclosed Form Relationships. [GNLS, in FORTRAN for CDC Computers]

Description: A use for GNLS, a general nonlinear least-squares curve fitting program, is presented. In this use GNLS determines a set of best parameters for relationships that cannot be written in closed form. This program can be useful for experimenters who need to determine experimental parameters by fitting nonclosed-form relationships to experimental data. Two examples are given to indicate how GNLS can be used for this type of problem. 11 figures.
Date: December 26, 1979
Creator: Abey, A. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Geophysical sensing experiments on Kilauea Iki lava lake

Description: The Hawaiian lava lake in the Kilauea Iki pit crater, resulting from the 1959 summit eruption of Kilauea volcano, has served as a natural laboratory for the continuing study of the petrology, rheology, and thermal history of ponded molten basalt flows in the field environment. During 1975 and 1976, a series of electromagnetic and seismic experiments were coordinated in an attempt to define the in-situ geophysical properties and the configuration of the molten lava core as closely as possible. D… more
Date: December 1, 1979
Creator: Hermance, J. F.; Forsyth, D. W. & Colp, J. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Thermal Regimes of Major Volcanic Centers: Magnetotelluric Constraints

Description: The interpretation of geophysical/electromagnetic field data has been used to study dynamical processes in the crust beneath three of the major tectono-volcanic features in North America: the Long Valley/Mono Craters Volcanic Complex in eastern California, the Cascades Volcanic Belt in Oregon, and the Rio Grande Rift in the area of Socorro, New Mexico. Primary accomplishments have been in the area of creating and implementing a variety of 2-D generalized inverse computer codes, and the applicat… more
Date: October 2, 1989
Creator: Hermance, J. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Geothermal Research Facilities study (Phase 0). Final report. Volume 1

Description: Phase 0 of a project for Experimental Geothermal Research Facilities focuses on identification of a representative liquid-dominated geothermal reservoir of moderate temperature and salinity, preliminary engineering design of an appropriate energy conversion system, identification of critical technology, and planning for implementation of experimental facilities. The objectives included development of liaison with the industrial sector, to ensure responsiveness to their views in facility require… more
Date: December 31, 1974
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Rock failure during massive hydraulic stimulation of the Baca location geothermal reservoir

Description: The analyses of microearthquake signals occurring during hydraulic stimulation provide an estimate of the size and location of the fractures thus produced. Studies of microearthquakes occurring during two large (> 10/sup 3/m/sup 3/) hydraulic stimulations of the hydrothermal reservoir at the Baca Location in the Jemez Mountains of northeastern New Mexico are reported. Both stimulations consisted of water, viscosity enhancer, and proppant. The microearthquake event rate was low but variable thro… more
Date: January 1, 1982
Creator: Pearson, C.; Keppler, H.; Albright, J. & Potter, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Seismological investigation of crack formation in hydraulic rock fracturing experiments and in natural geothermal environments. Progress report, September 1, 1981-August 31, 1982

Description: Accomplishments during the present reporting period are: high-quality digital data obtained in the crater and the flank of Mt. St. Helens by the deployment of 9 event-recorders; discovery of striking differences in arrival times and amplitudes of seismic events between the crater station and flank stations; successful interpretation of the above observations by a powerful new method of seismogram synthesis called Gaussian Beam Method; evidence obtained at Mt. St. Helens for a close connection b… more
Date: September 1, 1982
Creator: Aki, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation and targeting of geothermal energy resources in the southeastern United States. Progress report, April 1, 1977--June 30, 1977

Description: Progress is reported in the detailed study of the Winnsboro complex, South Carolina, as part of a broader project to provide insight into the behavior of uranium and thorium in syn- and post-metamorphic granitic plutons. In the area of the Winnsboro complex, a regional medium-pressure metamorphic event which reached amphibolite facies was followed by deformation and uplift with decrease in regional temperature and pressure. The Winnsboro complex was intruded with a resultant low-pressure contac… more
Date: October 1, 1977
Creator: Costain, John K.; Glover, Lynn, III & Sinha, A. Krishna
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Geothermal reservoir engineering management program plan (GREMP Plan)

Description: A plan was formulated for development of the geothermal resources of the United States. Six major elements were identified to make up the research program structure. These are: properties of materials; definition of reservoir characteristics; description of example reservoirs; modeling the behavior of geothermal systems; exploitation strategies; and economics. The six elements yield twelve research categories and fifty research projects. These are discussed in detail in Appendix A and summarize… more
Date: October 1, 1977
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Continued seismic monitoring of the Geysers, California geothermal area

Description: Probable effects of geothermal development on seismicity at the Geysers are shown by the spatial coherence of decreases in gravity and pressure with maximum geodetic deformation and seismic moment sum along a line through the most developed area of the geothermal field. Increases in the mean number of events per day and in the magnitude of largest annual event correlate with increases in steam production. The two largest earthquakes in the steam field occurred near the two injection wells most … more
Date: January 1, 1980
Creator: Ludwin, R. S. & Bufe, C. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Depositional setting, structural style, and sandstone distribution in three geopressured geothermal areas, Texas Gulf Coast

Description: Three areas in the Texas Gulf Coast region with different depositional settings, structural styles, and sandstone distribution were studied with well log and seismic data to evaluate some of the controls on subsurface conditions in geopressured aquifers. Structural and stratigraphic interpretations were made primarily on the basis of well log correlations. Seismic data confirm the log interpretations but also are useful in structure mapping at depths below well control.
Date: October 1, 1981
Creator: Winker, C. D.; Morton, R. A.; Ewing, T. E. & Garcia, D. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low-temperature geothermal resource and stratigraphy of portions of Yakima County, Washington

Description: The low-temperature geothermal resource of portions of Yakima County, south-central Washington, is defined by several least squares linear regression analyses of bottom-hole temperature and depth data. Intra-borehole flow prevents the use of borehole temperature gradients for geothermal resource assessment. Bottom-hole temperature and depth data were separated into fourteen well data groups based on geographic proximity, land slope azimuth, and position within the regional ground-water flow sys… more
Date: July 30, 1982
Creator: Biggane, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Temperatures and interval geothermal-gradient determinations from wells in National Petroleum Reserve in Alaska

Description: Temperature and related records from 28 wells in the National Petroleum Reserve in Alaska (NPRA) although somewhat constrained from accuracy by data gathering methods, extrapolate to undisturbed formation temperatures at specific depths below permafrost, and lead to calculated geothermal graidents between these depths. Tabulation of the results show that extrapolated undisturbed temperatures range from a minimum of 98/sup 0/F (37/sup 0/C) at 4000 feet (1220 m) to a maximum of 420/sup 0/F (216/s… more
Date: December 15, 1983
Creator: Blanchard, D.C. & Tailleur, I.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Inversion of commbined geophysical data for determination of structure beneath the Imperial Valley geothermal region. Final report

Description: A program aimed at developing formal numerical modeling data sets for defining the earth's near surface environment is discussed. The numerical modeling procedures developed and the results obtained in these areas are described. The conclusions are enumerated. (MHR)
Date: September 1, 1977
Creator: Savino, J. M.; Rodi, W. L.; Goff, R. C.; Jordan, T. H.; Alexander, J. H. & Lambert, D. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fluid and heat flow in gas-rich geothermal reservoirs

Description: Numerical-simulation techniques are used to study the effects of noncondensible gases (CO/sub 2/) on geothermal reservoir behavior in the natural state and during exploitation. It is shown that the presence of CO/sub 2/ has large effects on the thermodynamic conditions of a reservoir in the natural state, especially on temperature distributions and phase compositions. The gas will expand two-phase zones and increase gas saturations to enable flow of CO/sub 2/ through the system. During exploita… more
Date: July 1, 1983
Creator: O'Sullivan, M.J.; Bodvarsson, G.S.; Pruess, K. & Blakeley, M.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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National Magnetic Anomaly Map

Description: A record of the conclusions of a three-day meeting and workshop of the Committee for a National Magnetic Anomaly Map held in February 1976 is presented. The purpose of he workshop was to prepare a statement of the benefits, objectives, specifications, and requirements of a NMAM and establish a working plan for producing the map. (ACR)
Date: Spring 1976
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
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Geological and geophysical analysis of Coso Geothermal Exploration Hole No. 1 (CGEH-1), Coso Hot Springs KGRA, California

Description: The Coso Geothermal Exploration Hole number one (CGEH-1) was drilled in the Coso Hot Springs KGRA, California from September 2 to December 2, 1977. Chip samples were collected at ten foot intervals and extensive geophysical logging surveys were conducted to document the geologic character of the geothermal system as penetrated by CGEH-1. The major rock units encountered include a mafic metamorphic sequence and a leucogranite which intruded the metamorphic rocks. Only weak hydrothermal alteratio… more
Date: May 1, 1978
Creator: Galbraith, R. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Stratabound geothermal resources in North Dakota and South Dakota

Description: Analysis of all geothermal aquifers in North Dakota and South Dakota indicates an accessible resource base of approximately 21.25 exajoules (10{sup 18} J = 1 exajoule, 10{sup 18} J{approximately}10{sup 15} Btu=1 quad) in North Dakota and approximately 12.25 exajoules in South Dakota. Resource temperatures range from 40{degree}C at depths of about 700 m to 150{degree}C at 4500 m. This resource assessment increases the identified accessible resource base by 31% over the previous assessments. Thes… more
Date: August 1, 1991
Creator: Gosnold, W.D. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High resolution seismic attenuation tomography at Medicine Lake Volcano, California

Description: Medicine Lake Volcano, a broad shield volcano about 50km east of Mount Shasta in northern California, produced rhylotic eruptions as recently as 400 years ago. Because of this recent activity it is of considerable interest to producers of geothermal energy. In a joint project sponsored by the Geothermal Research Program of the USGS and the Division of Geothermal and Hydropower Division of the US-DOE, the USGS and LLNL conducted an active seismic experiment designed to explore the area beneath a… more
Date: July 10, 1987
Creator: Zucca, J. J. & Kasameyer, P. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Long-term seismic monitoring of the Roosevelt-Cove Fort KGRA's. Final report: Volume 77-3

Description: Earthquake monitoring of the Roosevelt-Cove Fort Hot Springs KGRA's was implemented by installation of three RF telemetered, vertical component, seismograph stations. Results are presented for the period 1 January 1977 to 30 June 1977. (MHR)
Date: December 1, 1977
Creator: Smith, R. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Workshop on modeling of electric and electromagnetic methods

Description: Twenty-two papers are included. Separate abstracts were prepared for eighteen and four were listed by title. A summary of the papers given is presented along with conclusions drawn and recommendations made by the conference participants. A list of participants is also included. (MHR)
Date: January 1, 1978
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Geothermal hydrology of Warner Valley, Oregon: a reconnaissance study

Description: Warner Valley and its southern extension, Coleman Valley, are two of several high-desert valleys in the Basin and Range province of south-central Oregon that contain thermal waters. At least 20 thermal springs, defined as having temperatures of 20/sup 0/C or more, issue from Tertiary basaltic flows and tuffs in and near the valleys. Many shallow wells also produce thermal waters. The highest measured temperature is 127/sup 0/C, reported from a well known as Crump geyser, at a depth of 200 meter… more
Date: January 1, 1981
Creator: Sammel, E.A. & Craig, R.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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