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Assessment of Geothermal Energy Potential Sulphurdale Geothermal Field, Sulphurdale, Utah

Description: The Sulphurdale Geothermal Field is located in Beaver County Utah, within the boundaries of the Cove Fort--Sulphurdale Known Geothermal Resource Area (KGRA). During the past year, three wells drilled in Section 7, T-26-S, R-6-W, have produced dry steam from a fractured volcanic formation located at a depth of about 1100 feet. Two of these three wells are currently prepared to supply steam to a power plant, and one well has been plugged and abandoned. ThermaSource, Inc. was retained by Mother Earth Industries, the operator of the field, to conduct well tests and render an opinion as to the nature of the geothermal reserves and assess the commercial potential of these reserves. Because of the limited area that has been explored to date, there can be no assurance that the reserves estimate will prove accurate. Project economics are based on parameters believed to be accurate, but there is no assurance that such cash flow projections will be realized.
Date: October 1, 1984
Partner: UNT Libraries Government Documents Department

Commercial production of ethanol in the San Luis Valley, Colorado. Final Report

Description: The purpose of this study is to assess the commercial feasibility of producing between 76 and 189 million liters (20 and 50 million gallons) of ethanol annually in the San Luis Valley, Colorado using geothermal energy as the primary heat source. The San Luis Valley is located in south-central Colorado. The valley is a high basin situated approximately 2316 meters (7600 feet) above sea level which contains numerous warm water wells and springs. A known geothermal resource area (KGRA) is located in the east-central area of the valley. The main industry in the valley is agriculture, while the main industry in the surrounding mountains is lumber. Both of these industries can provide feedstock for the production of ethanol.
Date: July 1, 1983
Creator: Hewlett, E.M.; Erickson, M.V.; Ferguson, C.D.; Sherwood, P.B.; Boswell, B.S.; Walter, K.M. et al.
Partner: UNT Libraries Government Documents Department

Statistical characterization of the federal geothermal leasing and permitting program. Final report, April 18, 1978-January 31, 1979

Description: The ineffectiveness thus far in the federal geothermal leasing program is documented. Leases have been issued on only 18% of non-competitive applications on land under BLM jurisdiction and 2% of applied-for National Forest land. It has taken an average of about two years to get a lease, although the time lapses involved are extremely erratic, and many applications have been pending since January 1974, the first month applications were accepted. Some gradual improvement in BLM performance was demonstrated, however. Only about 250 competitive leases have been issued on the 50% of BLM acreage and the 2% of KGRA acreage in National Forests which has been offered. The US Geological Survey postlease permitting performance is also non-uniform in timeframes required for approvals. To some extent, this has resulted from stated lessee priority.
Date: January 1, 1979
Creator: Beeland, G.V.; Ludington, J.A. & Schumann, E.
Partner: UNT Libraries Government Documents Department

Quality control and assurance applied to the analysis of environmental samples collected from known geothermal sites. Final report

Description: The components of an analytical quality control and assurance program for the analysis of trace toxic and priority pollutants are reviewed in general. It is recommended that these principles be applied to develop increased confidence in a laboratory's analytical accuracy by establishing validated standard operating procedures with built in controls and internal cross checks and developing an approved standard operating procedure for quality assurance consisting of audits and appropriate documentation. It is recommended that interlaboratory comparisons be considered as a means of continually documenting analytical accuracy.
Date: January 31, 1978
Creator: Cooper, J.A.
Partner: UNT Libraries Government Documents Department

Newberry exploratory slimhole

Description: During July-November, 1995, Sandia National Laboratories, in cooperation with CE Exploration, drilled a 5,360 foot exploratory slimhole (3.85 inches diameter) in the Newberry Known Geothermal Resource Area (KGRA) near Bend, Oregon. This well was part of Sandia`s program to evaluate slimholes as a geothermal exploration tool. During and after drilling the authors performed numerous temperature logs, and at the completion of drilling attempted to perform injection tests. In addition to these measurements, the well`s data set includes: over 4,000 feet of continuous core (with detailed log); daily drilling reports from Sandia and from drilling contractor personnel; daily drilling fluid record; and comparative data from other wells drilled in the Newberry KGRA.
Date: January 1, 1997
Creator: Finger, J.T. & Jacobson, R.D.
Partner: UNT Libraries Government Documents Department

New method for evaluating composite reservoir systems

Description: A simple new technique has been developed for evaluating interference test data in radially symmetric composite reservoirs. The technique is based on the realization that systematic variations in the apparent storage coefficient (calculated from semi-log analysis of the late-time data are indicative of a two-mobility (k/..mu..) reservoir. By analyzing variations in the apparent storage coefficient, both the mobility and size of the inner region can be calculated. The technique is particularly useful for evaluating heterogeneous geothermal systems where the intersection of several faults, or hydrothermal alteration has created a high permeability region in the center of the geothermal field. The technique is applied to an extensive interference test in the geothermal reservoir at Klamath Falls, Oregon. 7 refs., 7 figs.
Date: March 1, 1985
Creator: Benson, S.M. & Lai, C.H.
Partner: UNT Libraries Government Documents Department

Land-use conflicts in The Geysers-Calistoga KGRA: a preliminary study

Description: This preliminary study of potential land use conflicts of geothermal development in The Geysers region, one component of the LLL/LBL socioeconomic program, focuses on Lake County because it has most of the undeveloped resource and the least regulatory capability. The land resource is characterized in terms of its ecological, hydrological, agricultural, and recreational value; intrinsic natural hazards; and the adequacy of roads and utility systems and each factor is depicted on a map. Then those factors are analyzed for potential conflicts with both geothermal and urban development and the conflicts displayed on respective maps. A brief review of laws and methods germane to geothermal land-use regulation is included.
Date: December 1, 1979
Creator: O'Banion, K.; Hall, C. & Haven, K.
Partner: UNT Libraries Government Documents Department

Geothermal environmental overview project

Description: The basic purpose of the Geothermal Environmental Overview Project is to summarize and assess the state of environmental issues of the top priority KGRAs from among the 37 KGRAs currently identified by the Division of Geothermal Energy as having possibility for commercial development. The objectives of the Overview Project are inventory of available data, assessment of available data, identification of data gaps, and identification of key issues. (JGB)
Date: October 25, 1977
Creator: Anspaugh, L.R.
Partner: UNT Libraries Government Documents Department

Reconnaissance of the hydrothermal resources of Utah

Description: Geologic factors in the Basin and Range province in Utah are more favorable for the occurrence of geothermal resources than in other areas on the Colorado Plateaus or in the Middle Rocky Mountains. These geologic factors are principally crustal extension and crustal thinning during the last 17 million years. Basalts as young as 10,000 years have been mapped in the area. High-silica volcanic and intrusive rocks of Quaternary age can be used to locate hydrothermal convection systems. Drilling for hot, high-silica, buried rock bodies is most promising in the areas of recent volcanic activity. Southwestern Utah has more geothermal potential than other parts of the Basin and Range province in Utah. The Roosevelt Hot Springs area, the Cove Fort-Sulphurdale area, and the area to the north as far as 60 kilometers from them probably have the best potential for geothermal development for generation of electricity. Other areas with estimated reservoir temperatures greater than 150/sup 0/C are Thermo, Monroe, Red Hill (in the Monroe-Joseph Known Geothermal Resource Area), Joseph Hot Springs, and the Newcastle area. The rates of heat and water discharge are high at Crater, Meadow, and Hatton Hot Springs, but estimated reservoir temperatures there are less than 150/sup 0/C. Additional exploration is needed to define the potential in three additional areas in the Escalante Desert. 28 figs., 18 tabs.
Date: January 1, 1983
Creator: Rush, F.E.
Partner: UNT Libraries Government Documents Department

Conceptual model of the Klamath Falls, Oregon geothermal area

Description: Over the last 50 years significant amounts of data have been obtained from the Klamath Falls geothermal resource. To date, the complexity of the system has stymied researchers, leading to the development of only very generalized hydrogeologic and geothermal models of the area. Recently, the large quantity of available temperature data have been re-evaluated, revealing new information on subsurface heat flow and locations of faults in the system. These inferences are supported by borehole, geochemical, geophysical, and hydrologic data. Based on re-evaluation of all available data, a detailed conceptual model for the Klamath Falls geothermal resource is proposed.
Date: January 1, 1987
Creator: Prucha, R.H.; Benson, S.M. & Witherspoon, P.A.
Partner: UNT Libraries Government Documents Department

Kenya geothermal private power project: A prefeasibility study

Description: Twenty-eight geothermal areas in Kenya were evaluated and prioritized for development. The prioritization was based on the potential size, resource temperature, level of exploration risk, location, and exploration/development costs for each geothermal area. Suswa, Eburru and Arus are found to offer the best short-term prospects for successful private power development. It was found that cost per kill developed are significantly lower for the larger (50MW) than for smaller-sized (10 or 20 NW) projects. In addition to plant size, the cost per kill developed is seen to be a function of resource temperature, generation mode (binary or flash cycle) and transmission distance.
Date: October 1, 1992
Partner: UNT Libraries Government Documents Department

A Review of the Geothermal Reservoir Well Stimulation Program

Description: Republic Geothermal, Inc., and its subcontractors have planned and executed four experimental fracture stimulation treatments under the Department of Energy-funded Geothermal Reservoir Well Stimulation Program (GRWSP). The 2-year program, begun in February 1979, is Ultimately to include six full-scale field hydraulic and chemical stimulation experiments in geothermal wells. This paper describes the overall program and the four treatments completed to date. The GRWSP is organized into two phases. Phase I consists of literature and theoretical studies, laboratory investigations, and numerical work. The main purpose of this work is to establish the technological bases for geothermal well stimulation design. Phase I1 will include the planning, execution, and evaluation of six well stimulation treatments which utilize the technology developed in Phase I. Two stimulation experiments were performed at the Raft River, Idaho, known geothermal resource area (KGRA) in late 1979. This is a naturally fractured, hard rock reservoir with a relatively low geothermal resource temperature 149 C {+-} (300 F{+-}). A conventional planar hydraulic fracture job was performed in Well RRGP-5 and a ''Kiel'' dendritic, or reverse flow, technique was utilized in Well RRGP-4. In mid-1980, two stimulation experiments were performed at the East Mesa, California, KGRA. The stimulation of Well 58-30 provided the first geothermal well fracturing experience in a moderate temperature, 177 C {+-} (350 F{+-}), reservoir with matrix-type rock properties. The two treatments consisted of a conventional hydraulic fracture of a deep, low-permeability zone and a mini-frac ''Kiel'' treatment of a shallow, high-permeability zone in the same well. The stimulation experiment results to date were evaluated using short-term production tests, conventional pressure transient analysis, interference pressure data, chemical and radioactive tracers, borehole acoustic televiewer surveys and numerical models. This combination of evaluation techniques yielded an interpretation of fracture geometry and productivity enhancement. However, the evaluation of artificially induced fractures ...
Date: January 1, 1981
Creator: Campbell, D. A.; Hanold, R. J.; Sinclair, A. R. & Vetter, O. J.
Partner: UNT Libraries Government Documents Department

Imperial County geothermal development. Quarterly report, October 1-December 31, 1983

Description: The highlights of geothermal development in Imperial County during October, November, and December 1983 are discussed. Topics include the status of geothermal development projects in the County, geothermal staff activities and research projects, and other geothermal-related topics.
Date: January 1, 1984
Partner: UNT Libraries Government Documents Department

Honey Lake Geothermal Project, Lassen County, California. Final technical report

Description: This report discusses the drilling, completion, and testing of deep well WEN-2 for a hybrid electric power project which will use the area's moderate temperature geothermal fluids and locally procured wood fuel. The project is located within the Wendel-Amedee Known Geothermal Resource Area. (ACR)
Date: November 1, 1984
Partner: UNT Libraries Government Documents Department

Gravity survey of the Cove Fort-Sulphurdale KGRA and the North Mineral Mountains area, Millard and Beaver Counties, Utah. Technical report: Volume 77-4

Description: During the summers of 1975 and 1976, a gravity survey was conducted in the Cove Fort-Sulphurdale KGRA and north Mineral Mountains area, Millard and Beaver Counties, Utah. The survey consisted of 671 gravity stations covering an area of about 1300 km/sup 2/, and included two orthogonal gravity profiles traversing the area. The gravity data are presented as a terrain-corrected Bouguer gravity anomaly map with a contour interval of 1 mgal and as an isometric three-dimensional gravity anomaly surface. Selected anomaly separation techniques were applied to the hand-digitized gravity data (at 1-km intervals on the Universal Transverse Mercator grid) in both the frequency and space domains, including Fourier decomposition, second vertical derivative, strike-filter, and polynomial fitting analysis, respectively.
Date: August 1, 1977
Creator: Brumbaugh, W.D. & Cook, K.L.
Partner: UNT Libraries Government Documents Department

Gravity survey of the southwestern part of the sourthern Utah geothermal belt

Description: A gravity survey covering an area of 6200 km/sup 2/ was made over the southwestern part of the southern Utah geothermal belt. The objective of the gravity survey is to delineate the geologic structures and assist in the understanding of the geothermal potential of the area. A total of 726 new gravity stations together with 205 existing gravity stations, are reduced to give: (1) a complete Bouguer gravity anomaly map, and (2) a fourth-order residual gravity anomaly map; both maps have a 2-mgal contour interval. The complete Bouguer gravity anomaly map shows an east-trending regional gravity belt with a total relief of about 70 mgal which crosses the central portion of the survey area. The gravity belt is attributed to a crustal lateral density variation of 0.1 gm/cc from a depth of 5 to 15 km.
Date: March 1, 1981
Creator: Green, R.T. & Cook, K.L.
Partner: UNT Libraries Government Documents Department

Environmental analysis for geothermal energy development in the Geysers Region: executive summary

Description: The following are summarized for the Geysers--Calistoga KGRA: geothermal resource development, highlights of the master environmental assessment, control technology for hydrogen sulfide emissions, meteorological/climatological data base for hydrogen sulfide predictions, and future research needs. (MHR)
Date: May 1, 1978
Creator: Dorset, P.F.
Partner: UNT Libraries Government Documents Department