断层油藏物理模型中的室内规模CO2注入
Room-scale CO2 injections in a physical reservoir model with faults
摘要：
我们在一个断层地质剖面的室内尺度物理模型中进行了一系列重复的CO2注入。地下碳固存的相关参数，包括多相流，毛细管CO2捕获，溶解，和对流混合，进行了研究和量化。作为预测基准研究的一部分，我们解决并量化了典型CO2存储操作中存储容量和安全性的六个预定义指标。使用相同的几何形状，我们调查的重复实验运行的程度。我们的分析侧重于物理变化的空间发布的移动和溶解的CO2，多相流模式，发展质量的水相和气相，重力手指，和泄漏动力学。我们观察到非常好的重复运行之间的重叠高达97%的同质区域的再现性，和故障相关的异质性往往会降低再现性。值得注意的是，我们观察到一个振荡的背斜CO2泄漏行为从一个开放的背斜与溢出点在一个正断层的直接下盘，并讨论了所观察到的现象的根本原因在所研究的系统的约束。
英文摘要：
We perform a series of repeated CO2 injections in a room-scale physical model of a faulted geological cross-section. Relevant parameters for subsurface carbon sequestration, including multiphase flows, capillary CO2 trapping, dissolution, and convective mixing, are studied and quantified. As part of a forecasting benchmark study, we address and quantify six predefined metrics for storage capacity and security in typical CO2 storage operations. Using the same geometry, we investigate the degree of reproducibility of five repeated experimental runs. Our analysis focuses on physical variations of the spatial distribution of mobile and dissolved CO2, multiphase flow patterns, development in mass of the aqueous and gaseous phases, gravitational fingers, and leakage dynamics. We observe very good reproducibility in homogenous regions with up to 97 % overlap between repeated runs, and that fault-related heterogeneity tends to decrease reproducibility. Notably, we observe an oscillating anticline CO2 leakage behavior from an open anticline with a spill point in the immediate footwall of a normal fault, and discuss the underlying causes for the observed phenomenon within the constraints of the studied system.
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