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Quantitative Model of the Cerro Prieto Field

Description: A three-dimensional model of the Cerro Prieto geothermal field, Mexico, is under development. It is based on an updated version of LBL's hydrogeologic model of the field. It takes into account major faults and their effects on fluid and heat flow in the system. First, the field under natural state conditions is modeled. The results of this model match reasonably well observed pressure and temperature distributions. Then, a preliminary simulation of the early exploitation of the field is perform… more
Date: January 21, 1986
Creator: Halfman, S.E.; Lippmann, M.J. & Bodvarsson, G.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Assessment of the State-Of-The-Art of Numerical Simulation of Enhanced Geothermal Systems

Description: The reservoir features of importance in the operation of enhanced geothermal systems are described first (Section 2). The report then reviews existing reservoir simulators developed for application to HDR reservoirs (Section 3), hydrothermal systems (Section 4), and nuclear waste isolation (Section 5), highlighting capabilities relevant to the evaluation and assessment of EGS. The report focuses on simulators that include some representation of flow in fractures, only mentioning other simulator… more
Date: November 1, 1999
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental and theoretical investigation of the production of HCl and some metal chlorides in magmatic/hydrothermal systems. Progress report

Description: Hydrothermal experiments on the partitioning of HCl and copper chloride in the system silicate melt-hydrosaline liquid-aqueous vapor are described. Modelling of the aqueous phase evolution process is discussed. (MHR)
Date: December 31, 1990
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The long term observed effect of air and water injection into a fracture hydrothermal system

Description: Injection of atmospheric air mixed with waste reinjection liquid, has been occurring since 1982 at the Los Azufres, Mexico volcanic hydrothermal system. Several chemical and thermodynamical evidences show that air injection into this fractured geothermal field, could be considered as a long term natural tracer test. Nitrogen and Argon separated from the air mixture migrate from reinjection wells to production zones following preferential paths closely related to high permeability conduits. Thes… more
Date: January 1, 1992
Creator: Arriaga, Mario Cesar Suarez; Lopez, Mirna Tello; Rio, Luis de & Puente, Hector Gutierrez
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fluid-inclusion gas composition from an active magmatic-hydrothermal system: a case study of The Geysers, California geothermal field

Description: Hydrothermal alteration and the active vapor-dominated geothermal system at The Geysers, CA are related to a composite hypabyssal granitic pluton emplaced beneath the field 1.1 to 1.2 million years ago. Deep drill holes provide a complete transect across the thermal system and samples of the modem-day steam. The hydrothermal system was liquid-dominated prior to formation of the modem vapor-dominated regime at 0.25 to 0.28 Ma. Maximum temperatures and salinities ranged from 440 C and 44 wt. perc… more
Date: March 1, 2001
Creator: Moore, Joseph N.; Norman, David I. & Kennedy, B. Mack.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Progress toward using hydraulic data to diagnose lost circulation zones

Description: Several wellbore hydraulic models have been examined to determine their applicability in measuring the characteristics of lost circulation zones encountered in geothermal drilling. Characteristics such as vertical location in the wellbore, fracture size, effective permeability, and formation pressure must be known in order to optimize treatment of such zones. The models that have been examined to date are a steady-state model, a standpipe-pressure model, a raising-the-drill-bit model, a mud-wei… more
Date: July 1, 1995
Creator: Mansure, A. J. & Glowka, D. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Modification and implementation of the M. E. T. C. SIMPAC program

Description: The work reported in this study covers the modifications performed by PTTS in the three dimensional unsteady state model developed by the Morgantown Energy Technology Center by W. K. Sawyer and J. C. Mercer, A Diffusivity Model for Fluid Flow and Heat Conduction in Porous Media (Merc/SP-77/2), August 1978, United States Department of Energy, Morgantown Energy Technology Center (M.E.T.C.), Morgantown, West Virginia. The model is used to simulate a liquid dominated geothermal reservoir system. A … more
Date: May 1, 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Site specific analysis of geothermal development. Volume 1. Summary report

Description: MITRE/Metrek has analyzed development scenarios for 37 hydrothermal and geopressured prospects in the United States to assist DOE's Division of Geothermal Energy in mission-oriented planning of geothermal resource development. A summary of the site-specific analyses is presented with particular emphasis on possible recommendations for the Federal Geothermal Program.
Date: August 1, 1978
Creator: Leigh, J.; Cohen, A.; Jacobsen, W. & Trehan, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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DOE workshop: Sedimentary systems, aqueous and organic geochemistry

Description: A DOE workshop on sedimentary systems, aqueous and organic geochemistry was held July 15-16, 1993 at Lawrence Berkeley Laboratory. Papers were organized into several sections: Fundamental Properties, containing papers on the thermodynamics of brines, minerals and aqueous electrolyte solutions; Geochemical Transport, covering 3-D imaging of drill core samples, hydrothermal geochemistry, chemical interactions in hydrocarbon reservoirs, fluid flow model application, among others; Rock-Water Intera… more
Date: July 1, 1993
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Hydrothermal factors in porosity evolution and caprock formation at the Geysers steam field, California--insight from the Geysers Coring Project

Description: The Department of Energy (DOE)/geothermal industry-sponsored Geysers Coring Project (GCP) has yielded 236.8 m of continuous core apparently spanning the transition between the uppermost Geysers steam reservoir and its caprock. Both zones in the corehole are developed in superficially similar, fractured, complexly veined and locally sericitized, Franciscan (late Mesozoic) graywacke-argillite sequences. However, whereas the reservoir rocks host two major fluid conduits (potential steam entries), … more
Date: January 26, 1995
Creator: Hulen, Jeffrey B. & Nielson, Dennis L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Timber Mountain magmato-thermal event: An intense widespread culmination of magmatic and hydrothermal activity at the southwestern Nevada volcanic field

Description: Eruption of the Rainier Mesa and Ammonia Tanks Members Timber Mountain Tuff at about 11.5 and 11.3 Ma, respectively, resulted in formation of the timber Mountain (TM) caldera; new K-Ar ages show that volcanism within and around the TM caldera continued for about 1 m.y. after collapse. Some TM age magmatic activity took place west and southeast of the TM caldera in the Beatty -- Bullfrog Hills and Shoshone Mountain areas, suggesting that volcanic activity at the TM caldera was an intense express… more
Date: May 1, 1988
Creator: Jackson, M.R. Jr.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Multi-phase reactive transport theory

Description: Physicochemical processes in the near-field region of a high-level waste repository may involve a diverse set of phenomena including flow of liquid and gas, gaseous diffusion, and chemical reaction of the host rock with aqueous solutions at elevated temperatures. This report develops some of the formalism for describing simultaneous multicomponent solute and heat transport in a two-phase system for partially saturated porous media. Diffusion of gaseous species is described using the Dusty Gas M… more
Date: July 1, 1995
Creator: Lichtner, P. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Workshop on hydrologic and geochemical monitoring in the Long Valley Caldera: proceedings

Description: A workshop reviewed the results of hydrologic and geochemical monitoring in the Long Valley caldera. Such monitoring is being done to detect changes in the hydrothermal system induced by ongoing magmatic and tectonic processes. Workshop participants discussed the need to instrument sites for continuous measurements of several parameters and to obtain additional hydrologic and chemical information from intermediate and deep drill holes. In addition to seismic and deformation monitoring, programs… more
Date: October 1, 1984
Creator: Sorey, M. L.; Farrar, C. D. & Wollenberg, H. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Heat extraction in fractured hydrothermal reservoirs: Final report

Description: The main objective of the Heat Extraction Project has been the development of means to estimate the thermal behavior of geothermal fluids from fractured hydrothermal resources based on production of mixed reservoir fluids from heat sweep by reinjected brine and resource fluid cooled by drawdown and infiltrating waters. Several reports and publications, listed in the concluding section of this report, resulted from the application of the SGP heat sweep model to achieve this objective. The Heat E… more
Date: June 30, 1988
Creator: Kruger, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The use of air as a natural tracer infractured hydrothermal systems, Los Azufres, Mexico, case study

Description: Injection of atmospheric air mixed with cold water has been occurring since 1982 at the Los Azufres geothermal field. Several chemical and thermodynamical evidences show that air injection into this fractured hydrothermal system could be considered as a long term natural tracer test. Nitrogen and Argon separated from the air mixture migrate, under the action of the induced injection-extraction gradient, from reinjection sectors to production zones following preferential paths closely related to… more
Date: January 1, 1991
Creator: Arriaga, Mario César Suárez; Puente, Héctor Gutiérrez & Ochoa, Josefina Morena
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Final Report, Volume 77-5

Description: This report covers the following Tasks: Task 76.1.21--Color photos: Stereo color aerial photographs were made available to industry for copying at industry's expense on November 28, 1977 at 11:00 a.m. This final report on this task merely records that fact. Task 77.1.14--Proposal Review (MOD A002)--All activities under this task have been completed. No tangible deliverables were required. Task 76.1.14--Simultaneous modeling of multiple data sets: A technique for simultaneous inversion of MT and… more
Date: December 1, 1977
Creator: Ward, S.H. & Whelan, J.A. (and others)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Drilling investigations of crustal rifting processes in the Salton Trough, California. Revision 1

Description: The results of CSDP activities in the Salton Sea Geothermal Field (SSGF) are briefly described, concentrating on a shallow heat flow survey, but also discussing preliminary results from the Salton Sea Scientific Drilling Program (SSSDP). The hypothesis that localized thermal zones are the source of all the heat in the Salton Trough is examined. (ACR)
Date: January 1, 1986
Creator: Kasameyer, P. W.; Younker, L. W.; Newmark, R. L. & Duba, A. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Convective heat transport in geothermal systems

Description: Most geothermal systems under exploitation for direct use or electrical power production are of the hydrothermal type, where heat is transferred essentially by convection in the reservoir, conduction being secondary. In geothermal systems, buoyancy effects are generally important, but often the fluid and heat flow patterns are largely controlled by geologic features (e.g., faults, fractures, continuity of layers) and location of recharge and discharge zones. During exploitation, these flow patt… more
Date: August 1, 1986
Creator: Lippmann, M.J. & Bodvarsson, G.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Microseismic monitoring for evidence of geothermal heat in the capital district of New York. Volume 5. Phases I-III. Final report

Description: The seismic monitoring aspect of this work consisted of setting up and operating a network of seven seismograph stations within and around the study area capable of detecting and locating small earthquakes. To supplement the evidence from present day seismic activity, a list of all known historical and early instrumental earthquakes was compiled and improved from original sources for a larger region centered on the study area. Additional field work was done to determine seismic velocities of P … more
Date: June 1, 1983
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hydrothermal System and Seismic Activity of Hakone Volcano

Description: The structure of the Hakone hydrothermal system and geochemistry of thermal waters are described. The subsurface temperature map and the zonal distribution of thermal waters strongly suggest that thermal energy of the Hakone system is essentially supplied by dense volcanic steam rich in sodium chloride coming up through the volcanic conduit, from which subsurface streams of sodium chloride waters are derived. The seismic activity of Hakone mostly takes place at relatively shallow depths in the … more
Date: January 1, 1974
Creator: Oki, Y. & Hirano, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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ON THE CONDITIONS OF WATER AND HEAT FEEDING OF THE PAUZHETKA HYDROTHERMAL SYSTEM (SOUTH KANCHATKA, USSR)

Description: The Pauzhetka hydrothermal system is located in a volcano-tectonic depression near active volcanic centers. Temperatures at depths of 300-800 m are 180-210 C. The natural discharge of the hydrothermal system includes the discharge of the Pauzhetka springs and a concealed discharge in the bed of the Pauzhetka River (95 kg/s) and the steam discharge in the Kambalny Ridge (15 kg/s). Only the upper part of geothermal reservoir was penetrated by drillholes (up to 1200 m), therefore they have used a … more
Date: January 22, 1985
Creator: Kiryukhin, A.V. & Sugrobov, V.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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