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针对地下浅层储能咸水介质复杂的水文地质条件与矿物构成的特殊性,开展可控三维物理模拟试验,基于表面化学与胶体稳定性理论,从介观尺度分析回灌溶液宏观参数变化与含水介质中微纳米颗粒重新分布过程的内在关联;探索复杂时空条件下咸水层孔隙结构变化规律;确定不同储能模式下低渗透帷幕带的形成区域。研究结果表明,回灌溶液温度、盐度变化是打破颗粒间受力平衡,造成含水介质渗透性能下降的诱导机制。在抽-注井固定与调换模式下,经历完整储能周期,含水层整体相对渗透率k/k0分别下降至63%、57%,表明由微纳米颗粒物质重组,导致含水介质空间结构变化具有不可逆性。两组储能试验中,由于形成机制不同,低渗透帷幕带分别形成于700~900 mm与500~700 mm的渗流单元。
According to the complex hydrogeological conditions and the particularity of the mineral composition of the shallow aquifer medium, a controlled three-dimensional physical simulation experiment was carried out. Based on the surface chemistry and colloidal stability theory, the macro parameters of the recharge solution were analyzed from the mesoscopic scale. The inner correlation of redistribution of micro-nano particles in aqueous media was explored. The variation of pore structure of saline aquifer under complex space-time conditions was explored. The formation area of low-permeability curtain band under different energy storage modes was determined. The results show that the temperature and salinity of the solution are the inducing mechanisms that break the stress balance between the particles and cause the permeability of the aqueous medium to decline. Under the pattern of pumping-well fixing and exchanging, the relative relative permeability k / k0 of aquifers dropped to 63% and 57%, respectively, after experiencing a complete energy storage cycle, indicating that the spatial structure change of aqueous media resulted from the reorganization of micro-nano particles Irreversible. Due to the different mechanism of formation, the low-permeability curtain bands are formed in the seepage units of 700-900 mm and 500-700 mm, respectively, in both sets of energy storage tests.