摘要:
大规模封存CO2可能会发生泄漏并侵入浅地表造成环境影响。由于自然过程复杂变化,准确地掌握基线数值和分布对于近地表泄漏监测控制至关重要。采用移动设备沿预定路径进行流动现场监测和采样实验室测试分析结合的方法,对黄河三角洲潜在碳封存区域的大气、土壤气体组分、CO2浓度进行监测分析,以确定基线值和分布。研究结果表明: ①流动监测方法的CO2浓度在3个不同层位的监测图中均显示出与固定监测点连续监测数据的一致性,呈现了监测区域CO2浓度周期性波动的特征,同时, $\delta^{13} \mathrm{C}_{\mathrm{CO}_{2}}$与CO2和O2含量之间的关系显著,验证了流动监测方法的有效性; ②查明了2条环境背景基线,第一条是$\delta^{13} \mathrm{C}_{\mathrm{CO}_{2}}$和δ13COC基线值,土壤$\delta^{13} \mathrm{C}_{\mathrm{CO}_{2}}$值为-14.35‰~-20.95‰,大气$\delta^{13} \mathrm{C}_{\mathrm{CO}_{2}}$值为-16.92‰~-19.89‰,土壤δ13COC值为-20.59‰~-24.79‰,这些数据反映了温带气候下土壤生物活动产生的C同位素值范围,第二条是大气与土壤CO2浓度基线,大气CO2浓度范围为219.20~416.4 ppm,土壤30 cm深度的CO2浓度范围为1 002.793~14 808.13 ppm,土壤50 cm深度的CO2浓度范围为1 497.26~19 658.59 ppm。研究通过确定黄河三角洲潜在封存场所浅地表环境CO2浓度和同位素基线值,为未来实施大规模CO2封存后的地面监测提供了对照基准和监测方案参考。
Abstract:
The large-scale sequestration of CO2 may result in leakage, which could intrude into the shallow subsurface and cause environmental impacts. Due to the complex changes of natural processes, accurately determining baseline values and distributions is crucial for monitoring and controlling near-surface leakage. This study utilized portable devices along scheduled path to conduct mobile and field monitoring and sampling laboratory test, and monitored and analyzed atmospheric and soil gas components and CO2 concentrations at potential sequestration sites in Yellow River Delta to determine baseline values and distributions. The results indicate that: ① in the monitoring maps of three different layers, CO2 concentration data from the portable monitoring method are consistent with the continuous monitoring data from the fixed monitoring points, indicating the periodic fluctuation characteristics of the monitored CO2 concentration. Additionally, the statistically significant relationship between $\delta^{13} \mathrm{C}_{\mathrm{CO}_{2}}$ and CO2 and O2 content confirms the reliability of the portable monitoring method.② Two environmental background baseline values are established. The first is $\delta^{13} \mathrm{C}_{\mathrm{CO}_{2}}$ and δ13COC baseline, with the soil $\delta^{13} \mathrm{C}_{\mathrm{CO}_{2}}$ isotope values of -14.35‰~-20.95‰, atmospheric $\delta^{13} \mathrm{C}_{\mathrm{CO}_{2}}$ values of -16.92‰~-19.89‰, and soil δ13COC values of -20.59‰~-24.79‰. These values revealed the range of carbon isotope values produced by biological activity in temperate climates. The second is atmospheric and soil CO2 concentration baseline, with the atmospheric CO2 concentration of 219.20~416.4 ppm, soil CO2 concentrations at 30 cm depth of 1 002.793~14 808.13 ppm, and soil CO2 concentrations at 50 cm depth of 1 497.26~19 658.59 ppm. The environmental CO2 concentration and isotope baseline of shallow surface in potential carbon sequestration sites of Yellow River Delta were confirmed in this research, providing reference benchmarks and monitoring scheme recommendations for future surface monitoring after large-scale CO2 sequestration.
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