Results 231 to 240 of about 5,419,669 (274)

Geothermal-Hot-Water Waterflood

Journal of Petroleum Technology, 2002
This article is a synopsis of paper SPE 68724, "Geothermal Hot Waterflood: Balam South Telisa Sand, Sumatra, Indonesia," by John M. Pederson, SPE, and Jayadi H. Sitorus, SPE, P.T. Caltex Pacific Indonesia, originally presented at the 2001 SPE Asia Pacific Oil and Gas Conference and Exhibition, Jakarta, 17-19 April.
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6.6 Karstification by Geothermal Waters

2013
Thermal waters moving through soluble rock may create voids ranging in sizes from enlarged porosity and cavernosity to extensive two- and three-dimensional cave systems. Hydrothermal caves develop in a number of settings including deep-seated phreatic, shallow phreatic (near-water table), and subaerial (above the thermal water table).
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Chemical analysis of sulfur species in geothermal waters

Talanta, 2011
Analytical methods have been developed to determine sulfur species concentrations in natural geothermal waters using Reagent-Free™ Ion Chromatography (RF™-IC), titrations and spectrophotometry. The sulfur species include SO(4)(2-), S(2)O(3)(2-), and ∑S(2-) with additional determination of SO(3)(2-) and S(x)O(6)(2-) that remains somewhat ...
Hanna, Kaasalainen, Andri, Stefánsson
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Arsenic speciation of geothermal waters in New Zealand

Journal of Environmental Monitoring, 2012
Total arsenic and four arsenic species; arsenite (iAs(III)), arsenate (iAs(V)), dimethylarsinic acid (DMA(V)) and monomethylarsonic acid (MA(V)), are reported in 28 geothermal features from the Taupo Volcanic Zone (TVZ) and Waikato region of New Zealand.
Lord, G, Kim, N, Ward, NI
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Microbial silica deposition in geothermal hot waters

Applied Microbiology and Biotechnology, 2003
A combined use of molecular ecological techniques and geochemical surveys revealed that thermophilic or hyperthermophilic microorganisms living in geothermal environments are likely to be implicated in the formation of biogenic siliceous deposits. Electron microscopic observations indicated that numerous microorganism-like fabrics were preserved in ...
F, Inagaki, Y, Motomura, S, Ogata
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Geothermal Exploration for Ground Water

Geological Society of America Bulletin, 1969
Since 1961, precise ground-temperature measurements have been made at shallow depth in a number of geological terranes and climates. The objective has been to investigate the effectiveness of shallow geothermal techniques in geological exploration. The thermal sensors used are thermistors individually calibrated to within .02°C.
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Microbial life in geothermal waters

Geothermics, 2003
Geothermal waters usually contain many salts, often in varying concentrations. Some of these salts, especially if they are oxidizable or reducible, may be subject to microbial conversion and/or (bio)precipitation. Microorganisms can oxidize, sometimes even under anoxic (absence of oxygen) conditions, reduced sulfur compounds, iron(II) ions, and ...
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Water-Energy Nexus in Shallow Geothermal Systems

2019
Ground-source heat pumps (GSHPs) reduce CO2 emissions compared to conventional heating and cooling systems. The thermally altered zone (thermal plume) is a key aspect for land management of GSHPs.
Casasso A., Sethi R.
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The chemistry of geothermal waters in Iceland. III. Chemical geothermometry in geothermal investigations

Geochimica et Cosmochimica Acta, 1983
Abstract New data from geothermal wells in Iceland have permitted empirical calibration of the chalcedony and Na K geothermometers in the range of 25–180°C and 25–250°C respectively. The temperature functions are: t°C= 1112 4.91− log SiO 2 −273.15 t°C= 933 0.993+ log Na/K −273.15 Concentrations are expressed in ...
Stefán Arnórsson, Einar Gunnlaugsson, Hördur Svavarsson   +2 more
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Wind, water and geothermal energy

2009
The term ‘renewable energies’ refers to those sources of energy that are inexhaustible when seen from a human perspective. They are derived from ongoing environmental processes and made available for technical applications.
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