--> Investigation of Reactions Between Glauconite and Carbon Dioxide, With Implications for Carbon Sequestration

AAPG ACE 2018

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Investigation of Reactions Between Glauconite and Carbon Dioxide, With Implications for Carbon Sequestration

Anh V. Nguyen1, Rinat Gabitov1, Lauren Beckingham2, Toghiani Hossein3, Fei Yu4, Brenda Kirkland1


1Department of Geosciences, Mississippi State University, Starkville, MS, United States.
2Department of Civil Engineering, Auburn University, Auburn University, AL, United States.
3Department of Chemical Engineering, Mississippi State University, Mississippi State University, MS, United States.
4Department of Ag and Bioengineering, Mississippi State University, Mississippi State University, MS, United States.


July 23 - 25, 2018 – AAPG ACE 2018,

Posted: July 23-25, 2018

Abstract

Mineral trapping is considered as a promising technology for CO2 storage in a high temperature and pressure subsurface environment. The objective of this study was to develop a protocol to test the reactivity and effectiveness of the Fe/Ca/Mg bearing aluminosilicate mineral, glauconite, in carbon storage. A glauconite-rich sample from the Cambrian Riley Formation of Central Texas was analyzed by X-Ray Diffraction (XRD) to contain glauconite ~38 wt%, quartz ~58 wt%, and calcite ~4 wt%.

Experiments were conducted using two techniques where total pressure was: 1) controlled by delivering CO2 to a high-pressure apparatus; 2) kept at saturated vapor level in autoclaves. The first experiment was carried out in a Teflon-lined supercritical-fluid reactor containing 1.5 g of glauconitic sandstone with 0.01-0.5 cm diameter particles in 30 g of sea water for 10 days. The reactor was heated to 120oC and pressurized to 100 bars. After CO2 injection, pH of the brine decreased from 8.23 to 7. Scanning Electron Microscopy (SEM) and XRD revealed no carbonate mineral precipitate due to low pH.

In the other experiments, glauconite grains were concentrated to 69.5% glauconite and 30.5% quartz by sieving though 250 µm mesh, after grinding gently. The hardness of glauconite is much lower than quartz, causing a grain size separation between glauconite and quartz. The 250 µm sample was ground, then sieved through 63 µm mesh. For each experiment, 0.5 g of 10-63 µm grains presumably reacted with CO2 formed by 0.2 g ammonium carbonate decomposition in 5 ml brine of NaCl 0.5M and CaCl2 0.25M, with 200 µl or 65 µl concentrated HCl. The two autoclaves were heated to 120oC for 14 days. The pH parameters at the end of the experiment were 6.45 and 8.47, respectively. After treatment, XRD and SEM confirmed the presence of calcite with 51.1 wt% in the sample of pH 8.47, but not in pH 6.45.

When completed, this protocol will be applied to samples from sites across Mississippi including Kemper County and fields where carbon dioxide is used for EOR. This project, part of Project ECO2S, is supported by the U.S. DOE-NETL CarbonSAFE program and by Mississippi Power Company. The Southern States Energy Board manages this effort.

AAPG Datapages/Search and Discovery Article #90323 ©2018 AAPG Annual Convention and Exhibition, Salt Lake City, Utah, May 20-23, 2018