Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Geothermal field"”.
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Crustal Stress Heterogeneity in the Vicinity of a Geothermal Field: Coso Geothermal Field, CA
… structures seen in image logs from the Coso Geothermal Field, CA record variation in the azimuth of principal stress. Image logs of these structures from five boreholes were analyzed to quantify the stress heterogeneity for three geologically distinct locations: two boreholes within the Coso …
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3D conceptual and TOUGH2 modelling of the Waiotapu geothermal field, New Zealand
The Waiotapu geothermal system is a liquid dominated, high-temperature system located in the Taupo Volcanic Zone (TVZ) in the North Island of New Zealand. Seven exploration wells were drilled in Waiotapu in the late 1950s, which are drilled to around 500 m - 1100 m depth. Although Waiotapu has …
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Geophysical imaging methods for analysis of the Krafla Geothermal Field, NE Iceland
… to be reliable methods for characterizing geothermal sites and reservoirs while reducing drilling and production risks. In this study, we applied a finite difference tomography method and a double-difference tomography method to image the P- and S-wave velocity structure of the Krafla …
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Gravity studies of the Guayabo Caldera and the Miravalles geothermal field, Costa Rica
… study the temporal evolution of the Miravalles Geothermal Field. Detailed density and stratigraphy studies of both the drilled and exposed geology have both complemented and constrained the caldera gravity models. A new caldera volume - erupted mass balance model is proposed that computes the …
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Stratigraphy, Structure, and Fluid Flow at the Soda Lake Geothermal Field, western Nevada, USA
… assessed the geologic setting of the Soda Lake geothermal field, which lies in the southern part of the Carson Sink basin of northwestern Nevada within the Basin and Range of the western USA. The Basin and Range is a world-class geothermal province with significant untapped potential, …
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Body and surface wave ambient noise seismic interferometry across the Salton Sea Geothermal Field, California
… a controlled-source survey across the Salton Sea Geothermal Field in southern California. The non-uniform nature of the noise sources violated a primary assumption of the method and generated artifacts in the data. The artifacts generated by the high-energy impulsive sources (e.g. earthquakes, …
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Sub-surface geology, petrochemistry and hydrothermal alteration of Wells MW-03, MW-09 and MW-20 from Menengai geothermal field, Kenya
The Menengai geothermal field is one of the high temperature geothermal systems in Kenya. It is seated within the Great East Africa Rift System in the Central Kenyan Rift Valley and covered by quarternary volcanics. The study wells, MW-03, MW-09 and MW-20, were drilled inside the Menengai caldera, …
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Thermo-economic optimation of slim power cycles : a case of Ngozi geothermal project-Tanzania
Ngozi geothermal field located in Mbeya Tanzania, is the main geothermal project that the country focuses on, aiming at producing clean energy in term of both electricity and heat. The project is an exploration drilling phase. The present study focuses on developing an optimized strategy in terms …
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Analysis and interpretation of clustered microseismicity at geothermal and petroleum reservoirs
… of four microearthquake clusters near geothermal and petroleum reservoirs. One cluster was induced during a controlled hydraulic fracture experiment conducted by Atlantic Richfield Corporation (ARCO). The other three clusters occurred near geothermal fields in western Italy during …
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Remote sensing techniques for geothermal investigation and monitoring in New Zealand
… for the investigation and monitoring of geothermal areas in the Taupo volcanic zone of New Zealand. The research and development of a helicopter-borne video thermal infrared scanner technique and associated computer image processing methods constitutes the major portion of this study. In …
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The role of well testing in geothermal resource assessment
… well test data to estimate the capacity of a geothermal field are evaluated. The thesis lays emphasis on well completion and flow tests data, and uses the Reykjanes geothermal field in southwest Iceland as an example for the application of the selected methods. Analyses of data from step-rate …
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Modelling of Subsidence in Geothermal Fields
… is an environmental issue at New Zealand geothermal fields, particularly Wairakei. It has resulted in submissions to geothermal resource consent hearings, subsequent operational consent conditions and long-term monitoring programs. Wairakei geothermal field has a complex subsidence …
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The Green's function for the diffusion coefficient
… the fracture network for applications in geothermal energy. This has the potential to make geothermal wells more economical to make, more efficient to operate, and longer lived. Previous work has shown the diffusion coefficient can be extracted from synthetic datasets in both one dimension …
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Geologic interpretations of seismic scattering and attenuation for the Cianten Caldera and the surrounding area
… to the producing portion of the Awibengkok geothermal field. The Cianten Caldera contains rocks similar to those in the Awibengkok field, however, the Cianten Caldera is not capable of producing geothermal power on a commercial scale. The Cianten Caldera has been microseismically monitored …
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Geoejector : extracting geothermal fluid from a low-pressure geothermal well
… was developed and tested at the Theistareykir Geothermal Field in 2020 and 2021. The system connected a low-pressure geothermal well to a nearby high-pressure well to induce flow from the low-pressure well under otherwise unfavorable pressure. The subsonic geoejector has similar working …
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Fault-Controlled Damage and Permeability at the Brady Geothermal System, Nevada, U.S.A.
Identifying and locating permeable zones in geothermal fields is a critical step in determining reservoir potential and realizing energy production. Despite a general association with active faults, geothermal systems typically display heterogeneously distributed permeability that makes locating …
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Review of H2S abatement in geothermal plants and laboratory scale design of tray plate distillation tower
… in comparison to traditional fossil fuel plants, geothermal power plant emissions can still be substantial. In particular, dissolved non-condensable gases (NCG) such as CO2 and H2S within geothermal fluids have led to increased interest in developing methods for decreasing these emissions through …
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Complexity analysis of lumped parameter models : development of complexity reduction algorithm
… models have been shown to be a useful tool for geothermal reservoir analysis and production planning. Tank models are a common form of lumped parameter models, incorporating tanks of given capacitance partially filled with fluid. Between the tanks are connections with given conductance, that …
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Permeability modifying processes : thermal cracking and crack healing of geomaterials
… was performed on andesite plugs from the geothermal field in Awibengkok, Indonesia. Permeability (k) and specific storage capacity were measured by the oscillating flow method in a wide range permeameter, at room temperature, with effective pressures between 15 MPa and 95 MPa, before and …
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Deep learning framework bridges lab and field scale microseismic focal mechanism
… technologies such as nuclear waste storage, geothermal, and geologic carbon sequestration promise huge potential for reductions in greenhouse gas emissions and thus mitigate climate change. However, these systems are extremely challenging to design and operate owing to the limited knowledge …
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