Chemical structure changes of marine shale caused by supercritical carbon dioxide
| Autor: | Zhaohui Lu, Bowen Tang, Rongrong Tian, Xiayu Chen, Yiyu Lu, Zhidan Zhu, Huajian Shen, Jiren Tang |
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| Rok vydání: | 2020 |
| Předmět: |
Supercritical carbon dioxide
Renewable Energy Sustainability and the Environment Shale gas Chemical structure lcsh:TJ807-830 lcsh:Renewable energy sources 0211 other engineering and technologies Energy Engineering and Power Technology 02 engineering and technology Co2 storage lcsh:Production of electric energy or power. Powerplants. Central stations Fuel Technology 020401 chemical engineering Nuclear Energy and Engineering Chemical engineering lcsh:TK1001-1841 Environmental science 021108 energy 0204 chemical engineering Fourier transform infrared spectroscopy Oil shale |
| Zdroj: | Energy Exploration & Exploitation, Vol 39 (2021) |
| ISSN: | 2048-4054 0144-5987 |
| Popis: | The interaction between shale and CO2 is of great significance to CO2 storage and shale gas production; however, there are few reports on chemical changes after CO2 injection into shale reservoirs. We used Fourier transform infrared spectroscopy to study the chemical structure changes of shale samples before and after CO2 injection. In this paper, self-developed high-temperature and high-pressure vessels were used to examine CO2 treatment of shale to simulate the stratigraphic environment and infrared was used to study the influence of changes in pressure and temperature on the chemical interaction between shale and CO2. These results showed that: (1) after shale CO2 treatment, the number of functional groups remained unchanged, though the content and structure of the shale did change; (2) pressure increases reduced hydroxyl and aliphatic group levels in the shale; the branched-chain and aromaticity indexes of the shale were reduced by 81.5% and 53.8%, respectively, relative to untreated samples; (3) below 60°C, free water in the shale increased with temperature increases and dissolution of the shale increased; however, above 60°C, dissolution was inhibited which resulted in precipitation; (4) the dissolution degree of shale carbonate minerals positively correlated with CO2 pressure and temperature, while silicate minerals were unchanged CO2 pressure and temperature. Finally, the change of CO2 pressure had a more significant influence on the chemical structure of shale. These results provide a basis for the continuing study of the influence of chemical structure change of shale caused by CO2 on shale wettability and enhance the theoretical level of CO2 shale mining. |
| Databáze: | OpenAIRE |
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