The thermal springs and wells are listed by county with location, temperature, references, and notes of interest. (MHR)

This group of wells-of-opportunity (WOO) consists of six candidates; one in Texas and five in Cameron Parish, Louisiana. Of the latter, two of three candidates are considered to be mutually exclusive in that each exhibits good potential for testing geopressured-geothermal aquifers which are indicated to be of sufficient volume for purposes of a 30-day test. A final selection of one location may be made from these three wells, assuming all pass screening criteria, based on estimated cost of the test and the negotiation of a satisfactory agreement with the owners of the surface and/or the minerals. Information is presented on the six candidates and a short write-up is included on one other well. (MHR)

This group of wells-of-opportunity (WOO) consists of six candidates; one in Texas and five in Cameron Parish, Louisiana. Of the latter, two of three candidates in Twp 15S, Rge 5W are considered to be mutually exclusive in that each exhibits good potential for testing geopressured-geothermal aquifers which are indicated to be of sufficient volume for purposes of a 30-day test. A final selection of one location may be made from these three wells, assuming all pass screening criteria, based on estimated cost of the test and the negotiation of a satisfactory agreement with the owners of the surface and/or the minerals.

This two-part report provides an essentially complete listing of radioactive occurrences in Colorado, with a comprehensive bibliography and bibliographic cross-indexes. Part 1 lists approximately 3000 known radioactive occurrences with their locations and brief accounts of the geology, mineralogy, radioactivity, host rock, production data, and source of data for each. The occurrences are classified by host rock and plotted on U.S. Geological Survey 1/sup 0/ x 2/sup 0/ topographic quadrangle maps with a special 1 : 100,000-scale base map for the Uravan mineral belt. Part 2 contains the bibliography of approximately 2500 citations on radioactive mineral occurrences in the state, with cross-indexes by county, host rock, and the special categories of ''Front Range,'' ''Colorado Plateau,'' and ''thorium.'' The term ''occurrence'' as used in this report is defined as any site where the concentration of uranium or thorium is at least 0.01% or where the range of radioactivity is greater than twice the background radioactivity. All citations and occurrence data are stored on computer diskettes for easy retrieval, correction, and updating.

The results of gravity and aeromagnetic surveys of the Mineral Mountains and vicinity are presented as a terrain-corrected Bouguer gravity anomaly map (about 1450 stations with 1-mgal contour interval) and a total magnetic field intensity residual anomaly map (with contour interval 50 gammas), respectively. Combined interpretation of the gravity and aeromagnetic data was conducted based on comparing and contrasting various processed maps and interpretative geologic cross sections produced from each survey. (MHR)

A suite of silicic volcanic rocks is associated with the Roosevelt Hot Springs geothermal area in southwestern Utah. The volcanic sequence includes Tertiary rhyolite 8 My old and obsidian, ash and rhyolite of Quaternary age. The Quaternary lavas are characterized by high silica content (76.5% Si0/sub 2/) and total alkalies in excess of 9 percent. Obsidians commonly contain greater amounts of fluorine than water. Two older flows (0.8 My) can be distinguished from younger dome and pyroclastic material (approximately 0.5 My) by subtle differences in their chemistry. The mineralogy of the rhyolites consists of alkali feldspar, plagioclase, and small amounts of Fe-Ti oxides, biotite, hornblende and rare allanite. Fe-Ti oxide temperatures are 740 to 785/sup 0/C for the flows and 635 to 665/sup 0/C for the domes; two feldspar temperatures give similar results. The phase relationships of bulk rock, glass and feldspar compositions demonstrate that the younger Quaternary rhyolites could have been derived from the earlier magma type, represented by the obsidian flows, by a process of crystal fractionation. The major phases which must fractionate are alkali feldspar, plagioclase and quartz with minor amounts of biotite, magnetite and ilmenite participating also. Trace element patterns support this scheme as well. The …

Work to implement the program plan for the development of improved high temperature cementing materials for geothermal wells is continuing. Thermal gravimetric analysis studies on high temperature polymer cements indicated that formulations containing organosiloxane are thermally stable at 350/sup 0/C. Only slight (1%) weight losses at 400/sup 0/C were measured. Samples exposed for 10 days to 25% brine at 238/sup 0/C have not deteriorated. The relatively long curing time for some of the formulations (> 3 hr at 150/sup 0/C) enhances the probability of being able to pump the materials. Work to optimize polymer cement (PC) systems containing cross-linked mixtures of styrene, acrylonitrile, and acrylamide is continuing. Improvements in methods for curing the system have extended the thermal stability to the range 250/sup 0/ to 300/sup 0/C. Differential scanning calorimter and infra-red analysis studies are being performed on PC samples containing each of the chemical constituents of Type III portland cement and CaO compounds of anhydrous cements such as 3CaO . SiO/sub 2/, 2CaO . SiO/sub 2/, and 3CaO . Al/sub 2/O/sub 3/. The results indicate that 3CaO . SiO/sub 2/ derived from the chemical reaction between CaCO/sub 3/ and SiO/sub 2/ has a significant effect on the thermal stability …

Work to implement the program plan for the development of improved high temperature cementing materials for geothermal wells is continuing. Work on polymer cements containing mixtures of organosiloxanes and styrene is continuing to show the potential of the system as a high temperature cementing material. Samples exposed for 360 hr to brine at 250/sup 0/C have not shown evidence of hydrolysis and have maintained high strength. At 350/sup 0/C, the compressive strength is > 5000 psi. Preliminary tests to determine the pumpability of the system are in progress. Work on the development of inorganic cementing materials is continuing at six laboratories. Several promising materials have been identified. Tests to measure compressive strengths, bond strengths, permeability, and compatibility with drilling muds are in progress. Consistometer tests have been performed on some materials.

Work to implement the program plan for the development of improved high temperature cementing materials for geothermal wells is continuing. Experimental work has been completed at the Colorado School of Mines. Samples of ..beta..-dicalcium silicate-silica cement developed in this program have been submitted for additional evaluation. The initial screening portion of this work has identified several promising systems that will undergo more rigorous testing. Dynamic brine exposure testing of several systems has been initiated at the East Mesa Geothermal Test Facility. Testing at the Niland test site is scheduled to start soon. Property verification tests on cements produced in the materials development phase of the program were initiated at the Bureau of Standards. Preliminary data are available for five cements exposed for 176 h to water at a temperature of 195/sup 0/C. Three of the cements exhibited strength losses during the test. An aluminum hydroxide cement and a polymer cement showed slight increases in strength after the exposure. These and longer-term data will be utilized in the selection of a material for use in the remedial cementing of a hot dry rock well at the Los Alamos Scientific Laboratory.

Report issued by the U.S. Bureau of Mines discussing the CORES operations manual. As stated in the abstract, "this report describes the new Bureau of Mines Core Repository System (CORES) and presents the methods for selecting, processing, and storing physical samples and descriptive data for future reference by earth scientists" (p. 1). This report includes tables, illustrations, and photographs.

Previous thermal water analyses from the Clear Lake area are mentioned. Sample collection, field analysis, and laboratory analysis are described. Results are tabulated. (MHR)

Following detailed geological (Parry et al., 1976; Miller, 1976) and geophysical (Mase, Chapman, and Ward, 1978; Kilty, Mase, and Chapman, 1978) studies of the Monroe, Utah hydrothermal system, a program of drilling two intermediate depth test wells was undertaken. The objectives of the test well drilling were three-fold: (1) to obtain structural information bearing on the poorly known dip of the Sevier Fault, (2) to obtain temperature information below the shallow depths (approximately 300 ft.) sampled in the first phase of exploration, and (3) to provide cased wells which could act as monitor wells during the production phase of the project. The test well drilling was seen to be vital to the selection of a site for a production well. This report describes the results from the drilling of the two test wells, designated MC1 and MC2, and offers interpretation of the hydrothermal system which may be used as a basis for selecting production wells.

Twenty-five magnetotelluric (MT) sites were monitored. Amongst other MT functions, the transverse electric (TE) and transverse magnetic (TM) apparent resistivity and impedance phase data were provided for the frequency range 3 x 10/sup -3/ Hz to 100 Hz. Some one-dimensional inversion results for this area yielded very low values of estimated true resistivity. Such values are unrealistic in light of established notions about conductivity mechanisms in earth materials. Furthermore, the assembly of such inversions to form a crude two-dimensional model has yielded a calculated 2-D pseudosection far removed from the observed pseudosection. Trial-and-error modeling has provided a better fit although strong differences between observed and modeled data remain and cannot be overcome by any purely two-dimensional model. The most noteworthy difficulty is the presence of exaggerated contrasts in apparent resistivity persisting to the lowest frequency of observation for both modes of wave excitation. Single-conductor, 2-D, TE and TM modeling may explain such problems in terms of three-dimensional effects. Electrical strike estimation may be a meaningless endeavour in a strongly three-dimensional area. The total fields do not decompose into the standard principal modes (TE and TM) and H/sub z/ depends on horizontal derivatives of both electric field components. Multiple symmetry axes …

None

From Introduction: The purpose of this report is to provide geologic and mineral resource background information useful in evaluating the uranium potential of the Raleigh 1* X 20 sheet.

This Environmental Assessment (EA) has been prepared to assess the environmental implications of the Department of Energy's proposal to drill, complete, and test one geopressure well located in Brazoria County on a 2 hectares (five acre) test site 64 km (40 mi) south of Houston, Abstract 107, Perry and Austin Survey, Brazoria County, TX. The test well is herein referred to as GCO-DOE Pleasant Bayou No. 1. A maximum of four disposal wells will be located within .8 km (1/2 mi) of the proposed well. The DOE and the University of Texas Center for Energy Studies propose to operate the test facility for three years to evaluate the geopressure potential of the subsurface. Tests to be conducted include flow rates, fluid composition, temperature, gas content, geologic characteristics, and the land subsidence potential for subsequent production.

A plan for drilling a 7500 ft exploratory hole is described. This hole would be drilled at the Idaho National Engineering Laboratory, so that it could be immediately used by one of the government facilties. The plan details the hole design, describes the drilling program, proposes a testing program, and estimates costs. (MHR)

A representative cross section of the literature on the disposal of geothermal brine was perused and some of the general information and concepts is summarized. The following sections are included: disposal statistics--Texas Railroad Commission; disposal statistics--Louisiana Office of Conservation; policies for administering salt water disposal operations; salt water disposal experience of Gulf Coast operators; and Federal Strategic Petroleum Reserve Program's brine disposal operations. The literature cited is listed in the appended list of references. Additional literature is listed in the bibliography. (MHR)

Results from the initial phase of a study to establish subsurface design and operating criteria for a Compressed Air Energy Storage (CAES) facility are summarized. The primary objective was to derive a preliminary set of criteria that would help ensure the long term (30 to 40 year) integrity of CAES reservoirs in porous media, such as aquifers or abandoned natural gas reservoirs. In addition, appropriate research and development tasks were to be defined if the current technology was found to be inadequate. Preliminary stability and design criteria for storage of compressed air in porous media were determined on the basis of a survey of the open literature and the experience of experts in industry and universities. The results were separated into two categories: criteria for low temperature air injection (under 200/sup 0/F) and criteria for high temperature air injection (200 to 650/sup 0/F). Results are presented as maximum and/or minimum bounds for a number of parameters such as porosity, permeability, closure, storage pressure, caprock thickness, delta pressure, and caprock slope. One of the prime conclusions derived from an evaluation of the low temperature concept is that the technology currently exists to handle the potential design and operating problems. Therefore, there …

This report uses log analysis methods to analyze and compare "geologic and hydrologic data obtained from well tests and core studies," focusing specifically on the Edwards aquifer in Texas. It contains maps, tables, and figures.

An overview of the first five years of the Hawaiian Geothermal Project and a brief report of the management and coordination activity are presented. The first three phases are: exploratory surveys, experimental drilling, and well testing and analysis. A list of publications and a chronology of events are included. (MHR)

Information obtained on the operation of the plant, components, brine and steam composition, production and injection wells, and the potential of the Niland Reservoir are reviewed. The Geothermal Loop Experimental Facility (GLEF) was modified from a four stage flash/binary process to a two stage flash process with two parallel flash trains for the extraction of energy from a high temperature, high salinity, liquid-dominated resource. The general operation and accomplishments of the GLEF during the period from October 1977 through September 1978 are summarized and these activities during the period from July 1978 through September 1978 are detailed. The four stage flash/binary process test results were used in a Feasibility and Risk Study which identified the two stage flash cycle as the preferred cycle. The facility was modified to test critical portions of the cycle and testing was initiated.

Gruy Federal, Inc. (Gruy) operates under Contract No. EG-77-C-08-1528 to the Department of Energy, Division of Geothermal Energy, to evaluate potential alternate energy sources occurring within geopressured-geothermal (Geo) aquifers in Miocene, Oligocene, Tuscaloosa, Wilcox, and Frio formations along the Texas and Louisiana Gulf Coast. The project is entitled ''Investigation and Evaluation of Geopressured-Geothermal Wells''. The original period of performance was from September 26, 1977, through September 30, 1978; the contract was later extended through September 30, 1979. The first well on which testing was attempted under this contract was the Alice C. Plantation No. 2 Well, located in St. Mary Parish, Louisiana. Originally drilled by the Sun Oil Company to a total depth of 19,000 feet, this well was abandoned as a dry hole in January 1964. Gruy's reentry attempt ended with plugging and abandonment after a saltwater flow on September 17, 1978. This report is a comprehensive document detailing all events and costs relating to the Alice C. plantation well, from its initial selection as a reentry well through the plugging and abandonment operations.

A series of four, parallel, hydraulically induced hydrofractures were created. The hydrofractures will be used later in Phase I as the loading fractures for slurried explosives. An evaluation of the aerial extent, thickness, and resistance to air flow of each of these four fractures is reported. Downhole pressure, well-head pressure, surface resistivity, tiltmeter, hydrophone response, and crack opening measurements were used as dynamic tests to monitor and to later describe the hydrofracture. Downhole television, high-resolution seismic reflection survey (HRSRS), cross-hole seismic survey (CHSS), pressurized air-flow, tracer-gas flows, gamma-ray logging, and hydrogeologic monitoring were all used as posthydrofracture tests. Of all of these tests, tiltmeter, wellhead pressure, downhole television, pressurized air flows, and hydrogeologic monitoring were the most useful. Downhole pressure, crack opening, hydrophone response, tracer gas flow, and gamma-ray logging were less useful and provided only supportive data. HRSRS and CHSS provided no useful evaluation data. These evaluation tests showed the four hydrofractures to be narrow (less than or equal to 0.01 inches) and horizontal; to extend out at least to the outer ring of production wells in a southeasterly direction; to extend beyond the outer ring of production wells in a northwesterly direction; to have some degree of vertical …