scholarly journals Imaging Tools for Electrical Resistivity in Geothermal Exploration and Reservoir Assessment

2002 ◽  
Author(s):  
A.C. Tripp
Keyword(s):  
Electrical Resistivity ◽  
Geothermal Exploration ◽  
Reservoir Assessment

The Radial Movement of Permeability Fronts and Multiple Reaction Zones in Porous Media (includes associated papers 11284 and 11590 )

1982 ◽  
Vol 22 (01) ◽  
pp. 99-107 ◽  
Author(s):  
Yusuf Hekim ◽  
H. Scott Fogler ◽  
Conwell C. McCune
Keyword(s):  
High Temperature ◽  
Basin And Range ◽  
Well Logs ◽  
Well Log ◽  
Geothermal Resource ◽  
Basin And Range Province ◽  
Geothermal Exploration ◽  
Geophysical Well Logs ◽  
Log Interpretation ◽  
Reservoir Assessment

Review of Well Logging in the Basin and Range Known Geothermal Resource Areas Summary This paper discusses applications and interpretations of well logs to Basin and Range Province geothermal exploration and development. Problems experienced in use of conventional oilfield tools and techniques are reviewed, and methods to circumvent these problems are illustrated. Particular examples focus on log responses and matrix effects in complex lithologies. Introduction In 1977, the U.S. DOE's Div. of Geothermal Energy (DGE) initiated the "industry coupled program" to accelerate development of high-temperature geothermal resources. There are two key aspects of the program:cost sharing with industry for exploration, reservoir assessment, and reservoir confirmation, andthe release of geologic, geophysical, and geochemical data to improve knowledge and understanding of geothermal reservoirs. A third aspect of the program was to evaluate techniques and current methods on a cost-effective basis. Two regions of high industry interest and high geothermal potential were selected by DGE for procurements within the industry coupled program. The first request for proposals (RFP) resulted in six contracts for work in south central Utah, the second in 12 contracts for exploration and reservoir assessment work in the northern Basin and Range Province. The geothermal resource areas included in the program are shown in Fig. 1. The range of exploration activities of participating companies and data to be made public through this program are indicated in Table 1. Ward et al. studied these data and recommended a generalized exploration strategy for high-temperature geothermal systems in the Basin and Range Province. Fiore provided an overview and status report for the overall reservoir assessment program. The program's emphasis was direct drilltesting of the geothermal reservoir. At least one deep exploration well has been (or will be) drilled in each reservoir, at costs between $500,000 and $2,000,000. The high well costs demand prudent, systematic exploration before siting the well and as much geologic information as possible from each well test. Drill cuttings, geophysical well logs, temperature, pressure and flow test data, and complete well histories for each well drilled are transmitted to the U. of Utah Research Inst's. Earth Science Laboratory Div. (ESL). ESL reviews and approves the deliverables and makes data available to the public through established open-file procedures. Geophysical well logs are transmitted to Rocky Mountain Well Log Services (of Petroleum Information Corp.), where they are reproduced and distributed at nominal cost. In this manner detailed well data for 29 geothermal exploration wells and deep thermal gradient tests have been made public since 1977. The current status of drilling and the availability of well log data are listed in Table 2. Many thermal gradient holes with only mud and temperature logs are not included in Table 2. Note that DGE has instituted complementary and supporting programs designed to advance well log interpretation and high-temperature tool development. At ESL detailed well log/lithologic interpretations form an important part of several reservoir case histories and topical studies published or in preparation. These integrated interpretations are instrumental to the planning of subsequent well tests and to overall reservoir evaluation. We describe well log data that have been made available through the industry coupled program. Logging parameters used, data quality, previously published log interpretations, and some results of the ESL log interpretation work are reviewed and discussed. Well Logging in Geothermal Areas JPT P. 1104^

scholarly journals ИСЛАНД УЛСЫН БАГА ТЕМПЕРАТУРТАЙ, ГАЗРЫН ГҮНИЙ ДУЛААНЫ ИЛЭРЦТЭЙ ТАЛБАЙ ДЭЭРХ ТЕМ БА МТ АРГУУДЫН ХЭРЭГЛЭЭ

2017 ◽  
pp. 24-33
Author(s):  
Саранцэцэг Л ◽  
Hersir P G ◽  
Arnason К
Keyword(s):  
Electrical Resistivity ◽  
Cross Sections ◽  
Geothermal System ◽  
Strong Response ◽  
Geothermal Exploration ◽  
Geophysical Exploration ◽  
Low Resistivity ◽  
The Cross

Geothermal exploration involves geology, geochemistry and geophysics. In geophysical exploration, resistivity surveying plays a most important role in delineating the reservoir. The parameters that control the geothermal system show a strong response to electrical resistivity. The resistivity methods that are mostly used in geothermal exploration in Iceland are TEM (Transient electromagnetics) and MT (Magnetotellurics). The resulting resistivity cross sections and resistivity depth slices, show a shallow lying low resistivity layer and deep lying low resistivity towards the end of the cross sections

scholarly journals Slimhole well casing design for high-temperature geothermal exploration and reservoir assessment

2017 ◽  
Vol 34 (2) ◽  
pp. 465 ◽  
Author(s):  
Michał Kruszewski ◽  
Tomasz Śliwa ◽  
Sverrir Þórhallsson ◽  
Mohsen Assadi
Keyword(s):  
High Temperature ◽  
Geothermal Exploration ◽  
Reservoir Assessment

The National Geothermal Exploration Technology Program

Geophysics ◽  
1979 ◽  
Vol 44 (10) ◽  
pp. 1721-1737 ◽  
Author(s):  
L. Ball ◽  
J. W. Salisbury ◽  
P. R. Kintzinger ◽  
A. F. Veneruso ◽  
S. H. Ward
Keyword(s):  
System Modeling ◽  
Department Of Energy ◽  
Energy Utilization ◽  
Commercial Development ◽  
Thermal Methods ◽  
Geothermal Resources ◽  
Geothermal Exploration ◽  
Program Goal ◽  
Near Term ◽  
Reservoir Assessment

In response to the Geothermal Energy Research, Development, and Demonstration Act of 1974, a federal geothermal program has been established with the objective of stimulating the commercial development of geothermal resources. The program goal is to increase the annual rate of energy utilization from the present 0.04 quads (500 MWe) to 0.3–0.5 quads in the near term (about 1985), 4.0–9.0 quads in the mid‐term (1985–2000), and 16.0–28.0 quads in the long term (by about 2020). The realization of these goals depends upon the discovery and exploitation of many new geothermal resource areas. The Department of Energy program for geothermal exploration and assessment has been structured to address technological barriers presently hindering the economical discovery and delineation of geothermal resources. We describe the program elements—exploration technology, reservoir assessment, reservoir confirmation, and reservoir engineering—in light of the need to evaluate some 1500 new prospects in order to meet the federal midterm electric power goal of 20,000 MWe on‐line by the year 2000. We illustrate the program elements with suggested sequences for exploration, assessment, and confirmation of a 200-MWe resource in the eastern Basin and Range physiographic province. The estimated costs for these sequences are $385,000, $565,000, and $3,190,000, respectively. Deep drilling constitutes the major element in the confirmation costs. An economical exploration strategy requires use of cost‐effective techniques; thus, we have initiated a number of technology assessment studies. Pursuant to these studies, we present a summary of our initial findings and discuss the status and needs for topics such as system modeling, thermal methods, rock and fluid properties, seismic, and electrical methods. Accurate reservoir assessment requires new developments in logging instrumentation for high‐temperature, hostile environment boreholes and improved means for interpreting acquired data. The logging instrumentation program is aimed at upgrading logging systems for operation at 275°C and 48.3 MPa in the near term (1982) and 350°C and 138 MPa by 1986. Existing hardware is being upgraded, components and materials are being developed, and critically needed prototype tools for temperature, flow, and pressure measurements will be evaluated. A program addressing log interpretation problems uses industrial expertise to analyze specific shortcomings in our ability to infer critical reservoir parameters from acquired data. The program will also establish and maintain test and calibration wells and support research logging and petrophysical studies.

In-situ electrical-resistivity measurements in the high-voltage electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 68-69
Author(s):  
W. E. King
Keyword(s):  
Electrical Resistivity ◽  
Electron Microscope ◽  
High Voltage ◽  
Resistivity Measurements ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
High Voltage Electron ◽  
Wide Range ◽  
Helium Gas

A side-entry type, helium-temperature specimen stage that has the capability of in-situ electrical-resistivity measurements has been designed and developed for use in the AEI-EM7 1200-kV electron microscope at Argonne National Laboratory. The electrical-resistivity measurements complement the high-voltage electron microscope (HVEM) to yield a unique opportunity to investigate defect production in metals by electron irradiation over a wide range of defect concentrations.A flow cryostat that uses helium gas as a coolant is employed to attain and maintain any specified temperature between 10 and 300 K. The helium gas coolant eliminates the vibrations that arise from boiling liquid helium and the temperature instabilities due to alternating heat-transfer mechanisms in the two-phase temperature regime (4.215 K). Figure 1 shows a schematic view of the liquid/gaseous helium transfer system. A liquid-gas mixture can be used for fast cooldown. The cold tip of the transfer tube is inserted coincident with the tilt axis of the specimen stage, and the end of the coolant flow tube is positioned without contact within the heat exchanger of the copper specimen block (Fig. 2).

The stabilization of B.C.C. Cu in Cu/Nb nanolayered composites

1996 ◽  
Vol 54 ◽  
pp. 228-229
Author(s):  
H. Kung ◽  
A.J. Griffin ◽  
Y.C. Lu ◽  
K.E. Sickafus ◽  
T.E. Mitchell ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Layer Thickness ◽  
Volume Fraction ◽  
Ion Beam ◽  
High Strength ◽  
Cross Sectional ◽  
Metastable Structure ◽  
High Resolution Tem ◽  
Potential Improvement ◽  
Two Phases

Materials with compositionally modulated structures have gained much attention recently due to potential improvement in electrical, magnetic and mechanical properties. Specifically, Cu-Nb laminate systems have been extensively studied mainly due to the combination of high strength, and superior thermal and electrical conductivity that can be obtained and optimized for the different applications. The effect of layer thickness on the hardness, residual stress and electrical resistivity has been investigated. In general, increases in hardness and electrical resistivity have been observed with decreasing layer thickness. In addition, reduction in structural scale has caused the formation of a metastable structure which exhibits uniquely different properties. In this study, we report the formation of b.c.c. Cu in highly textured Cu/Nb nanolayers. A series of Cu/Nb nanolayered films, with alternating Cu and Nb layers, were prepared by dc magnetron sputtering onto Si {100} wafers. The nominal total thickness of each layered film was 1 μm. The layer thickness was varied between 1 nm and 500 nm with the volume fraction of the two phases kept constant at 50%. The deposition rates and film densities were determined through a combination of profilometry and ion beam analysis techniques. Cross-sectional transmission electron microscopy (XTEM) was used to examine the structure, phase and grain size distribution of the as-sputtered films. A JEOL 3000F high resolution TEM was used to characterize the microstructure.

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