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Geothermal fluids, composition

Summary of fluid compositions of Japanese geothermal systems (Chiba, 1991)... [Pg.303]

Table 9.13 Gas composition in geothermal fluids (from Henley, 1984). = pressure of... Table 9.13 Gas composition in geothermal fluids (from Henley, 1984). = pressure of...
Geothermal reservoir rocks are typically fractured and therefore exhibit variable and anisotropic permeability. For that reason it is neither possible to predict with confidence how an injection well may perform with respect to its injectivity nor with respect to which way the injected fluid will flow once it is in the reservoir. Because of this complication, the success of injection varies between fields and it is anticipated that a special injection scheme must be developed for each field depending on its characteristics, mainly the three-dimensional distribution of permeability and the waste fluid composition. Injection may require drilling of special wells. Alternatively, wells drilled for the purpose of production may not have adequate yield but can be used successfully as injection wells. When this is the case, no special wells need to be drilled for injection purposes, which reduces road building and therefore scenery spoliation. [Pg.328]

Bjarnason, J. O. Arnorsson, S. 1986. Nisyros Geothermal Development. Nisyros Well NIS-2. Production Characteristics and Fluid Composition. Unpublished National Energy Authority Report OS-86038, Reykjavik, Iceland, 97 pp. (In Icelandic.)... [Pg.331]

Fig. 7. Relative concentrations (mmol/mol on a water-free basis) of N2, He, and Ar components of the gas mixtures of the steam produced in different periods of exploitation. Composition of crustal fluids, together with N2/Ar ratios for atmosphere and air-saturated groundwater are reported for comparison (Giggenbach Goguel 1989). The N2/Ar ratio of 800 represents the ratio found in geothermal fluids before re-injection. Fig. 7. Relative concentrations (mmol/mol on a water-free basis) of N2, He, and Ar components of the gas mixtures of the steam produced in different periods of exploitation. Composition of crustal fluids, together with N2/Ar ratios for atmosphere and air-saturated groundwater are reported for comparison (Giggenbach Goguel 1989). The N2/Ar ratio of 800 represents the ratio found in geothermal fluids before re-injection.
Kasemann, S.A., Meixner, A., Erzinger, J., Viramonte, J.G., Alonso, R.N. Franz, G. (2004) Boron isotope composition of geothermal fluids and borate minerals from salar deposits (central Andes/NW Argentina). Journal of South American Earth Sciences 16, 685-697. [Pg.358]

Brine is a geothermal solution containing appreciable concentrations of sodium chloride or other salts. The chemical composition including the salinity of geothermal fluids varies greatly from one reservoir to another. Variations in chemistry and salinity affect the design, maintenance, and longevity of wells and surface equipments. Recent advances in this area include ... [Pg.1187]

Then it is possible to determine the relative proportions of M-, L- and S-derived carbon in individual samples of arc-related geothermal fluids. Appropriate end-member compositions must be selected, and both Sano and Marty (1995) and Sano and Williams... [Pg.350]

Water-rock interaction can vary between two extremes. When the water/rock ratio is small and the 5 0 in the rock dominates the system it is the fluid composition which is changed, as happens in geothermal systems. On the other hand, when the water/rock ratio is large and the 5 0 of die water dominates, the 5 0 value of the rock is modified. Taylor (1974, 1977) derived mass balance equations from which the water/rock ratio may be calculated from 5 0 values. For a closed system, from which none of the water is lost, the water/rock (W/R) ratio, integrated over the lifetime of the hydrothermal system, is ... [Pg.289]

Ragnarsdottir, K.V., Walther, J.V. and Amorsson, S. (1984) Description and interpretation of the composition of fluid and alteration mineralogy in the geothermal system, at Svartsengi, Iceland. Geochim. Cosmochim. Acta, 48, 1535-1553. [Pg.283]

Figure 14. Plot of Li isotopic composition vs. concentration of thermal waters from the continents and the oceans (see text for references). Differences between the isotopic range of marine versus non-marine fluids emphasizes the variability in 5 Li of continental rocks compared to oceanic basalt. The dilution of the continental fluids goes along with their lower temperatures vent fluids are the only truly geothermal samples here, with temperatures in excess of 300°C. Figure 14. Plot of Li isotopic composition vs. concentration of thermal waters from the continents and the oceans (see text for references). Differences between the isotopic range of marine versus non-marine fluids emphasizes the variability in 5 Li of continental rocks compared to oceanic basalt. The dilution of the continental fluids goes along with their lower temperatures vent fluids are the only truly geothermal samples here, with temperatures in excess of 300°C.
Natural recharge of cooler ground water to high-T geothermal systems may cause changes in the composition of the fluid discharged... [Pg.308]

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See also in sourсe #XX -- [ Pg.648 ]



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