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Time-lapse analysis of pressure transients due to ocean tides for estimating CO2 saturation changes
International Journal of Greenhouse Gas Control ( IF 4.6 ) Pub Date : 2018-08-23 , DOI: 10.1016/j.ijggc.2018.08.005
Kozo Sato , Roland N. Horne

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 cost-effective and labour-saving monitoring technique.



中文翻译:

海洋潮汐引起的压力瞬变的时移分析,用于估算CO 2饱和度变化

这项研究提出并检验了一种实用技术,该技术可以利用受海潮影响的海上压力瞬变来分析CO 2的储存响应。太阳系物体的引力吸引引起海洋潮汐,并且响应于这种潮汐现象,孔隙压力表现出昼夜和半昼间的波动。压力波动幅度与加载效率有关,加载效率是储层弹性和流体饱和度的函数。因此,加载效率可用于估计原位孔隙可压缩性和CO 2饱和度。以延时方式应用潮汐信号分析,可能会看到CO 2的时间变化饱和,因此描述了隔离的CO 2的动态行为。在日本Tom小牧的海上CO 2储存地点进行的分析中,在关闭期间检测到了CO 2饱和度随时间的下降,这主要是由于CO 2从井中迁移出来所致。所提出的方法基本上仅需要连续的压力数据,该数据通常在CO 2储存操作期间可用,因此可以是一种经济高效且节省劳力的监测技术。

更新日期:2018-08-23
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