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Reactivity of supercritical sulfur dioxide and carbon dioxide in a carbonate reservoir; an experimental investigation of supercritical fluid-brine-rock interactions relevant to the Madison Limestone of southwest Wyoming

Curtis Chopping and John P. Kaszuba
Reactivity of supercritical sulfur dioxide and carbon dioxide in a carbonate reservoir; an experimental investigation of supercritical fluid-brine-rock interactions relevant to the Madison Limestone of southwest Wyoming
Interpretation (Tulsa) (August 2017) 5 (4): SS43-SS58

Abstract

Managing impure carbon dioxide produced by fossil fuel-based generation of electricity is required for successful implementation of carbon capture, utilization, and storage. Impurities in carbon dioxide, particularly SO (sub x) and NO (sub x) , are geochemically more reactive than the carbon dioxide and may adversely impact a carbon dioxide storage reservoir by generating additional acidity. Hydrothermal experiments are performed to evaluate geochemical and mineralogic effects of injecting SO (sub 2) -CO (sub 2) fluid into a carbonate reservoir. The experimental design is based on a natural carbon dioxide reservoir, the Madison Limestone on the Moxa Arch of Southwest Wyoming, which serves as a natural analog for geologic cosequestration of sulfur dioxide and carbon dioxide. Idealized Madison Limestone (dolomite + calcite + or - anhydrite + pyrite) and Na - Cl-SO (sub 4) (super 2-) brine (I = 0.5 molal, initial pH = 8.5) reacted at reservoir conditions (110 degrees C and 25 MPa) for approximately 165 days (3960 h). Carbon dioxide fluid containing 500 ppmv sulfur dioxide was injected and the experiment continued for approximately 55 days (1326 h). Sulfur dioxide partitions out of the supercritical carbon dioxide phase and dissolves into coexisting brine on the time scale of the experiments (55 days). Injecting supercritical SO (sub 2) -CO (sub 2) or pure supercritical carbon dioxide into a brine-limestone system produces the same in situ pH (4.6) and ex situ pH (6.4-6.5), as measured 28 h after injection because dissolution of calcite buffers in situ pH. Precipitation of anhydrite sequesters injected sulfur and, coupled with dissolution of calcite, effectively buffers the amount of dissolved calcium to the same concentrations measured in limestone-brine experiments injected with pure carbon dioxide. Supercritical SO (sub 2) -CO (sub 2) does not enhance the sequestration potential of a carbonate reservoir relative to pure supercritical carbon dioxide. Our results substantiate predictions from natural analog studies of the Madison Limestone that anhydrite traps sulfur and carbonate minerals ultimately reprecipitate and mineralize carbon in carbonate reservoirs.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 5
Serial Issue: 4
Title: Reactivity of supercritical sulfur dioxide and carbon dioxide in a carbonate reservoir; an experimental investigation of supercritical fluid-brine-rock interactions relevant to the Madison Limestone of southwest Wyoming
Affiliation: University of Wyoming, Department of Geology and Geophysics, Laramie, WY, United States
Pages: SS43-SS58
Published: 201708
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 60
Accession Number: 2018-027904
Categories: Geochemistry of rocks, soils, and sedimentsEconomic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch map
N41°00'00" - N45°00'00", W111°04'60" - W104°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 2018
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