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首页> 外文期刊>International Journal of Greenhouse Gas Control >Impact of formation slope and fault on CO2 storage efficiency and containment at the Shenhua CO2 geological storage site in the Ordos Basin, China
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Impact of formation slope and fault on CO2 storage efficiency and containment at the Shenhua CO2 geological storage site in the Ordos Basin, China

机译：鄂尔多斯盆地鄂尔多斯盆地学神华二氧化碳地质储存网站坡度与故障对二氧化碳蓄能效率及遏制的影响

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摘要

Carbon dioxide (CO2) storage security is a key issue in CO2 geological storage (CGS). A three-dimensional (3D) conceptual reservoir model of the Shenhua CO2 geological storage site in the Ordos Basin has been used to investigate the impact of reservoir formation dip and the influence of enhanced permeability fault zones on CO2 storage and migration security. A total of 8 simulations were carried out using the TOUGH2 integral finite difference modelling code with the ECO2N fluid property module. The simulation results showed that the dip of the reservoir formation and fault had a significant impact on CO2 migration and storage security. Increasing the dip of the reservoir increased CO2 migration distance, decreased the total volume of CO2 safely stored in the formation and resulted in increased maximum gas saturation and liquid mass fraction of dissolved CO2. The presence of fault provided a channel for CO2 leakage and caused an irregular distribution of formation pressure. The onset time of leakage through the fault proved to be a function of formation dip, occurring at 465, 230, and 160 years following commencement of CO2 injection for dips of 5 degrees, 10 degrees, and 15 degrees respectively. The lateral extent of both the high saturation CO2 plume and the plume of dissolved CO2 was greater in the steeply dipping faulted reservoir model, suggesting that gently dipping un-faulted reservoir formations should be selected for future CGS projects in the Ordos Basin.
机译：二氧化碳（CO2）存储安全是CO2地质储存（CGS）中的关键问题。鄂尔多斯盆地中申华二氧化碳地质储存站点的三维（3D）概念储库模型用于探讨储层地层浸渍的影响以及增强渗透性断层区对二氧化碳储存和迁移安全的影响。使用Eco2N流体性能模块的韧性2积分有限差异建模代码进行总共8次模拟。仿真结果表明，储层形成和故障的倾角对二氧化碳迁移和储存安全有重大影响。增加储存器的倾斜度增加CO 2迁移距离，降低了安全储存在地层中的CO2的总体积，并导致溶解CO 2的最大气体饱和度和液体质量分数增加。故障的存在提供了一种用于CO2泄漏的通道，并导致形成压力的不规则分布。通过该故障的开始泄漏时间被证明是形成浸渍的函数，在465,230和160年下发生，分别为5度，10度和15度的二氧化碳喷射。在陡峭的浸渍断层储层模型中，高饱和CO 2羽流和溶解二氧化碳的羽流的横向程度较大，这表明应选择轻轻地浸渍未断层的储层组，以便在鄂尔多斯盆地中的未来CGS项目。

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