Illite Dissolution Rates and Equation (100 to 280 dec C)

Carroll, Susan

doi:10.15121/1159941

Title: Illite Dissolution Rates and Equation (100 to 280 dec C)

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Abstract

The objective of this suite of experiments was to develop a useful kinetic dissolution expression for illite applicable over an expanded range of solution pH and temperature conditions representative of subsurface conditions in natural and/or engineered geothermal reservoirs. Using our new data, the resulting rate equation is dependent on both pH and temperature and utilizes two specific dissolution mechanisms (a “neutral” and a “basic” mechanism). The form of this rate equation should be easily incorporated into most existing reactive transport codes for to predict rock-water interactions in EGS shear zones.

Authors:: Carroll, Susan

Publication Date:: Fri Oct 17 00:00:00 EDT 2014

Other Number(s):: 454

DOE Contract Number:: FY14 AOP 1.4.2.2

Research Org.:: USDOE Geothermal Data Repository (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office

Collaborations:: Lawrence Livermore National Laboratory

Subject:: 15 Geothermal Energy

Keywords:: geothermal; illite; dissolution kinetics; illite dissolution

OSTI Identifier:: 1159941

DOI:: https://doi.org/10.15121/1159941

Citation Formats


                    Carroll, Susan. Illite Dissolution Rates and Equation (100 to 280 dec C).  United States: N. p., 2014. 
        Web.  doi:10.15121/1159941.

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                    Carroll, Susan. Illite Dissolution Rates and Equation (100 to 280 dec C).  United States.  doi:https://doi.org/10.15121/1159941

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                    Carroll, Susan. 2014.  
"Illite Dissolution Rates and Equation (100 to 280 dec C)".  United States.  doi:https://doi.org/10.15121/1159941.  https://www.osti.gov/servlets/purl/1159941. Pub date:Fri Oct 17 00:00:00 EDT 2014

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@article{osti_1159941,

  title        = {Illite Dissolution Rates and Equation (100 to 280 dec C)},

  author       = {Carroll, Susan},

  abstractNote = {The objective of this suite of experiments was to develop a useful kinetic dissolution expression for illite applicable over an expanded range of solution pH and temperature conditions representative of subsurface conditions in natural and/or engineered geothermal reservoirs. Using our new data, the resulting rate equation is dependent on both pH and temperature and utilizes two specific dissolution mechanisms (a “neutral” and a “basic” mechanism). The form of this rate equation should be easily incorporated into most existing reactive transport codes for to predict rock-water interactions in EGS shear zones.},

  doi          = {10.15121/1159941},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Fri Oct 17 00:00:00 EDT 2014},

  month        = {Fri Oct 17 00:00:00 EDT 2014}

}

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DOI: https://doi.org/10.15121/1159941

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Chlorite, Biotite, Illite, Muscovite and Feldspar Dissolution Kinetics at Variable pH and Temperatures up to 280 deg C

Dataset Carroll, Susan ; Smith, Megan M. ; Lammers, Kristin

Chemical reactions pose an important but poorly understood threat to EGS long-term success because of their impact on fracture permeability. This report summarizes the dissolution rate equations for layered silicates where data were lacking for geothermal systems. Here we report updated rate laws for chlorite (Carroll and Smith 2013), biotite (Carroll and Smith, 2015), illite (Carroll and Smith, 2014), and for muscovite. Also included is a spreadsheet with rate data and rate equations for use in reactive transport simulators.
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Summary Sheet silicates and clays are ubiquitous in geothermal environments. Their dissolution is of interest because this process contributes to scaling reactions along fluid pathways and alteration of fracture surfaces, which could affect reservoir permeability. In order to better predict the geochemical impacts on long-term performance of engineered geothermal systems, we have measured chlorite, biotite, illite, and muscovite dissolution and developed generalized kinetic rate laws that are applicable over an expanded range of solution pH and temperature for each mineral. This report summarizes the rate equations for layered silicates where data were lacking for geothermal systems.
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