Injecting supercritical CO${}_2$ (scCO${}_2$) into brine-filled fracture-dominated reservoirs causes brine displacement and possibly evaporite precipitations that alter the fracture space. Here, we report on isothermal laboratory experiments on scCO${}_2$-induced flow-through drying in a naturally fractured granodiorite specimen under effective normal stresses of 5-10 MPa, where two drying regimes are identified. A novel approach is developed to delineate the evolution of brine saturation and relative permeability from fluid production and differential pressure measurements. Under higher compressive stresses, the derived relative permeability curves indicate lower mobility of brine and higher mobility of the scCO${}_2$ phase. The derived fractional flow curves also suggest an increase in channelling and a decrease in brine sweep efficiencies under higher compressive stresses. Finally, lowering compressive stresses seems to promote less water evaporation. Our experimental results assist in understanding the injectivity of single fractures and eventually of fracture networks during subsurface applications that involve scCO${}_2$ injection into saline formations.

注入超临界 CO${}_2$ (scCO${}_2$) 进入充满盐水的裂缝主导的储层会导致盐水置换和可能的蒸发沉淀，从而改变裂缝空间。在这里，我们报告了关于 scCO 的等温实验室实验${}_2$- 在 5-10 MPa 的有效法向应力下，自然破裂花岗闪长岩试样中的诱导流通干燥，其中确定了两种干燥方式。开发了一种新方法来描绘来自流体生产和压差测量的盐水饱和度和相对渗透率的演变。在较高的压缩应力下，导出的相对渗透率曲线表明盐水的流动性较低，而 scCO 的流动性较高${}_2$阶段。导出的分流曲线还表明，在较高的压缩应力下，沟流增加，盐水波及效率降低。最后，降低压应力似乎促进了较少的水蒸发。我们的实验结果有助于了解在涉及 scCO 的地下应用过程中单个裂缝和最终裂缝网络的注入能力${}_2$ 注入盐层。