天然CO2注入煤层驱替CH4运移路径上煤体化学结构变化
Study on Coal Chemical Structure Changes During the Migration Path After Coalbed CH4 Replacement by Natural CO2
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摘要: 以窑街煤田天然CO2注入煤层并驱替煤层CH4为研究背景，通过在距离CO2注入点不同距离处连续采取煤样，对系列煤样进行红外光谱分析，结果显示：红外光谱谱图波数在2 800~3 000、2 270~2 413、1 000~1 200 cm-1区域吸收峰值发生了不同程度的变化。又对2个煤矿的超临界CO2处理前后的煤样进行红外光谱分析，上述波数的吸收峰强度也发生变化，而且都是处理后的煤样吸收峰强度低一些，进一步证实超临界CO2在运移过程中确实能从煤基质中萃取了脂肪族芳香族碳氢化合物及一部分矿物质。Abstract: Based on displacing coalbed methane by the natural CO2 injection in Yaojie coalfield, coal samples and gas samples are taken continuously at different distances away from CO2 injection points. Infrared spectroscopy analysis is done for series of coal samples; the results show that the absorption peaks change significantly in the spectra wavenumbers of 2 800～3 000 cm-1, 2 270～2 413 cm-1, and 1 000～1200 cm-1. Then, the coal samples before and after supercritical CO2 treatment are analyzed from another coal mines, The above-mentioned wavenumbers of the absorption peak intensity also change, and treated coal sample absorption peak intensity is lower. These experiments demonstrate that injection of supercritical CO2 can extract the aliphatic aromatic hydrocarbons and part of the minerals from the coal matrix during the migration path.
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Keywords:
- Yaojie Coal Field /
- infrared spectroscopy /
- chemical structure /
- natural CO2 /
- CH4 replacement
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