Reliability of the thermodynamic dataset used for SUPCRT98 (revised SUPCRT92).-Verification by the calculation of mineral saturation index for geothermal systems-.

OGATA Masaki, UCHIDA Etsuo

doi:10.11456/shigenchishitsu1992.54.47

Bibliographic Information

Other Title

ＳＵＰＣＲＴ９８（修正版ＳＵＰＣＲＴ９２）の熱力学データセットの信頼性－地熱系における鉱物飽和度指数計算による検証－
Verification by the calculation of mineral saturation index for geothermal systems
地熱系における鉱物飽和度指数計算による検証

Description

The reliability of the thermodynamic dataset of SUPCRT98 (revised SUPCRT92, Johnson et al., 1992) was checked by calculating mineral saturation indices for geothermal waters. For comparison, the calculation was also conducted using the thermodynamic dataset of SOLVEQ86 (revised SOLVEQ, Reed, 1982). New computer code (GEOMS) was written using Visual Basic (ver.6.0). In order to calculate the mineral saturation indices, mass-balance equations and mass-action equations are solved in a successive iteration method. Total ionizable hydrogen ion (TOTH) was used as a mass balance for hydrogen ion.<BR>Judging from the consistency of the calculation results with the field evidences, the dataset of SOLVEQ86 is considered to be unreliable in the temperature range of 170 to 300°C. On the other hand, the thermodynamic dataset.of SUPCRT98 was judged to be more reliable in the same temperature range. In the calculation of mineral saturation indices, attention should be paid to the aluminium concentration in geothermal waters because the aluminium concentration makes a large effect in the calculation results of mineral saturation indices.

Journal

Shigen-Chishitsu

Shigen-Chishitsu 54 (1), 47-60, 2004

The Society of Resource Geology

Keywords

Details 詳細情報について

CRID: 1390282679443838464

NII Article ID: 130003442326

DOI: 10.11456/shigenchishitsu1992.54.47

ISSN: 21854033; 09182454

Text Lang: ja

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JaLC
CiNii Articles

Abstract License Flag: Disallowed

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