The Role of Kerogen Versus Clay in the Adsorption Mechanisms of CO2 and CH4 in Gas Shales
Abstract/Contents
- Abstract
- The global atmospheric carbon dioxide concentration, primarily related to fossil fuel combustion, has increased significantly compared to pre-industrial levels, resulting in a rise in the global average temperature. To stabilize the atmospheric CO2 concentration, one possible approach is to inject and store CO2 into gas shale, where significant amounts of methane are present and can be exploited and recovered. Experimental studies indicate that CO2 has a stronger likelihood of being adsorbed over CH4, thus the injected CO2 may displace the adsorbed methane inside the gas shale, thereby potentially enhancing methane recovery efficiency. However, the adsorption properties of CO2 and methane on gas shale are not fully understood, and need to be investigated both experimentally and theoretically. In our recent work, the excess adsorption isotherms of CO2 and CH4 on gas shale samples have been measured under subsurface temperature and pressure conditions, using a Rubotherm magnetic suspension balance. The samples used in this study are from the Eagle Ford and Barnett formations. Both core chip and powdered forms of sample have been investigated. According to our preliminary results, the shale sample in powder form gives higher gas capacity than the same sample in chip form. Reduced macropore mass-transfer resistance and more accessible pore space in the powdered sample are possible explanations for its higher gas capacity. Since kerogen and clay are the major constituents that contribute to the adsorption behavior in gas shale, adsorption isotherm measurements for isolated kerogen and illite (used as reference clay) are performed to determine the roles that each component plays in the overall shale adsorption mechanism and capacity estimates. In addition, Grand Canonical Monte Carlo has been used to study the adsorption behavior of carbon-based materials with different pore sizes and functional groups. Results from simulation and experiment are compared to further investigate the adsorption properties of gas shale and to predict the adsorbed phase densities as a function of temperature, pressure, and pore size. The influence of chemical heterogeneity on the adsorption behavior of carbon matrix has also been studied.
Description
| Type of resource | text |
|---|---|
| Date created | June 2014 |
Creators/Contributors
| Author | Wang, Beibei |
|---|---|
| Primary advisor | Wilcox, Jennifer |
| Degree granting institution | Stanford University, Department of Energy Resources Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
Bibliographic information
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Preferred citation
- Preferred Citation
- Wang, Beibei. (2014). The Role of Kerogen Versus Clay in the Adsorption Mechanisms of CO2 and CH4 in Gas Shales. Stanford Digital Repository. Available at: https://purl.stanford.edu/kj379kj3758
Collection
Master's Theses, Doerr School of Sustainability
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