Title:

MODELING OF THERMO-HYDRODYNAMIC-CHEMICAL PROCESSES: SOME APPLICATIONS TO ACTIVE HYDROTHERMAL SYSTEMS

Authors:

Alexey Kiryukhin, Tianfu Xu, Karsten Pruess, Igor Slovtsov

Key Words:

numerical simulation, chemical deposition

Geo Location:

Japan; Russia; Kamchatka

Conference:

Stanford Geothermal Workshop

Year:

2002

Session:

Modeling

Language:

English

File Size:

1767KB

View File:

Abstract:

Available data on secondary mineral distributions, host rock properties and chemical composition of deep geothermal fluids ("parent geothermal fluids") of nine geothermal fields: Mutnovsky, Pauzhetsky (Kamchatka), Sumikawa, Kakkonda, Uenotai, Okuaizu, Hachijo-jima , Ogiri, Fushime (Japan) were used for thermo-hydrodynamic-chemical (THC) models calibration study. THC processes in hydrothermal systems were modeled with the TOUGHREACT numerical code (Xu and Pruess, 2001). Steady-state flow and single-phase liquid conditions were assumed. Our initial studies assume a highly simplified geochemical system, which includes the following mineral phases: quartz, K-feldspar, Na-feldspar, and cristobalite. Fluid containing Cl-, Na+ and CO2 was recharged to geothermal reservoirs under a specified range (10-200oC) of temperatures. Based on the modeling the following results were obtained: (1) Model validation by Na-K and SiO2 geothermometers; (2) Precipitation (K-feldspar and quartz) dominates over dissolution (Na-feldspar), meaning that selfsealing of reservoir took place. This has been confirmed by K-feldspar abundance in production zones at the geothermal fields; (3) Model sensitivity of mineral phase change to pH, porosity and flowrate has been studied


ec2-3-88-254-50.compute-1.amazonaws.com, you have accessed 0 records today.

Press the Back button in your browser, or search again.

Copyright 2002, Stanford Geothermal Program: Readers who download papers from this site should honor the copyright of the original authors and may not copy or distribute the work further without the permission of the original publisher.


Attend the nwxt Stanford Geothermal Workshop, click here for details.

Accessed by: ec2-3-88-254-50.compute-1.amazonaws.com (3.88.254.50)
Accessed: Thursday 28th of March 2024 06:29:29 PM