东海陆架盆地咸水层CO2封存地质条件适宜性评价

Evaluation on of geological suitability for CO2 storage in salty aquifers in the East China Sea Shelf Basin

  • 摘要: 系统分析了东海陆架盆地咸水层CO2封存的关键地质要素,认为在构造和沉积演化的控制下盆地表现出“整体封存有利、东西封存差异”的特征,东部坳陷裂陷充分,构造单元面积大、沉积厚并且地层发育全,潜在封存层系为中新统和渐新统;西部坳陷裂陷早,构造单元面积相对小、地层薄并且地层时代老,CO2封存的有利储盖组合为古新统—始新统。对各二级构造单元咸水层CO2的封存量进行了计算,结果表明,东海陆架盆地D级咸水层CO2封存量为636.2亿t,其中东部坳陷的西湖凹陷和基隆凹陷封存量最大,均超过100亿t,其次为西部坳陷的瓯江凹陷,达到64亿t。结合关键封存要素建立了东海陆架盆地D级CO2地质储存适宜性评价指标体系,并对各评价单元进行了适宜性评价,结果表明西湖凹陷和瓯江凹陷CO2封存适宜性最好,为东海陆架盆地CO2封存的有利远景区。

     

    Abstract: Abstracts: Based on the systematic analysis of key geological elements of CO2 storage in salty aquifers in the East China Sea Shelf Basin, it is believed that under the control of tectonic and sedimentary evolution, the basin shows the characteristics of "Favorable for overall storage, but having differences in the eastern and western depression". The eastern depression is fully rifted, with a large tectonic unit area, thick sediment, and full stratigraphic development; and the potential sequestration systems are the Miocene and Oligocene. The western depression was rifted early, the tectonic unit area is relatively small, with thin and old strata, and the favorable reservoir-cap assemblages for CO2 storage are the Paleocene and Eocene. The CO2 storage capacity of the salty aquifers in each secondary tectonic unit was calculated. Results show that the CO2 storage in the D-level salty aquifers of the East China Sea shelf basin is 63.62 billion tons, among which the storage capacity in the Xihu Sag and the Jilong Sag in the eastern depression is the largest, both exceeding 10 billion tons, followed by the Oujiang Sag in the western depression, reaching 6.4 billion tons. Combined with the key storage factors, an index system for evaluating the suitability of D-class CO2 geological storage in the East China Sea shelf basin was established. An index system for evaluating the suitability of D-level CO2 geological storage in the East China Sea shelf basin was established. The suitability of each evaluation unit was also evaluated. Overall, Xihu Sag and Oujiang Sag have the best suitability for CO2 storage and are favorable prospective areas for CO2 storage in the East China Sea shelf basin.

     

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