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首页> 外文期刊>International Journal of Greenhouse Gas Control >Time-lapse analysis of pressure transients due to ocean tides for estimating CO2 saturation changes
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Time-lapse analysis of pressure transients due to ocean tides for estimating CO2 saturation changes

机译：由于海潮估算CO2饱和度变化而导致的压力瞬变的延时分析

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This study proposed and examined a practical technique for analysing CO2 storage responses using offshore pressure transients affected by the ocean tide. The gravitational attractions of the solar-system bodies cause ocean tides, and the pore pressure exhibits diurnal and semidiurnal fluctuations in response to such tidal phenomena. The pressure-fluctuation amplitude is related to the loading efficiency, which is a function of reservoir elastic properties and fluid saturations. Therefore, the loading efficiency can be used to estimate the in situ pore compressibility and the CO2 saturation. Applying the tidal-signal analysis in a time-lapse manner, one may see temporal changes in CO2 saturation and consequently describe the dynamic behavior of sequestered CO2. In the analysis at the offshore CO2 storage site in Tomakomai, Japan, a temporal decrease in CO2 saturation was detected during the shut-in period, which is caused primarily by CO2 migration away from the well. The proposed methodology essentially requires only continuous pressure data, which are routinely available during CO2 storage operations, and thus, can be a cog-effective and labour-saving monitoring technique.
机译：本研究提出并检查了使用海潮影响的海上压力瞬变分析CO2储存响应的实用技术。太阳系体的引力景点导致海潮，孔隙压力表现出响应这种潮汐现象的昼夜和半衰老波动。压力波动幅度与负载效率有关，其是储存器弹性性能和流体饱和的函数。因此，装载效率可用于估计原位孔压缩性和CO2饱和度。以延时的方式施加潮汐信号分析，可以看到CO2饱和的时间变化，因此描述了螯合CO2的动态行为。在日本Tomakomai的海上二氧化碳储存场所的分析中，在关闭期间检测到CO2饱和的时间减少，主要由CO2远离井的二氧化碳迁移引起。所提出的方法基本上只需要连续的压力数据，这在CO2存储操作期间经常可用，因此可以是COG-USITED和省力的监测技术。

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