碳酸盐岩化学溶蚀是岩溶空隙形成与演变的重要动力，对岩溶空间分布起关键控制作用。水化学组分和温度不同的饱和溶液发生混合，将引起饱和溶液混合溶蚀和温度混合溶蚀的水热协同作用，使原有饱和溶液产生新的溶蚀能力，促进岩溶发育。岩溶系统水-热-溶质时空分布的定量刻画极具挑战，导致碳酸盐岩混合溶蚀机制研究存在过程静态化和因素单一化的不足。本项目通过不同饱和溶液混合条件下的碳酸盐岩溶蚀试验，识别水热协同混合溶蚀作用下的介质溶蚀特征，并构建耦合多场多相反应运移的岩溶发育数值模型，量化溶蚀过程中的流场-温度场-水化学场动态变化；继而解析饱和溶液/温度混合溶蚀协调模式与溶液热化学变化之间的响应关系，阐明碳酸盐岩水热协同混合溶蚀机制；最终，结合岩石孔隙网络的微观影像和数值模拟结果，揭示不同饱和溶液混合条件下的碳酸盐岩孔隙结构演化规律。本项目成果可为碳酸盐岩地区水、地热、油气资源储容空间勘探提供理论依据和技术支撑。

The chemical dissolution of carbonate rocks is the important power for karst voids forming and evolving, which is the key factor for karst spatial distribution. The mixing of saturated solutions with different hydrochemical components and temperature will cause the synergistic action of the saturated solution mixing corrosion and temperature mixing corrosion. Original saturated solutions will produce dissolution capacity again, thereby accelerating the karst evolution. Describing the temporal and spatial distributions of flow-heat-solutes in the karst system quantitatively is a challenging task. Therefore, studies in the mixing corrosion mechanism of carbonate rocks still suffer from limitations of processes staticization and factors simplification. This project identifies the rock’s dissolution characteristics under the water-heat synergistic mixing corrosion, by the carbonate rock mixing dissolution experiments with different saturated solutions. The karst evolution numerical model coupled the reaction and transport of multi-fields and multi-phases is established to research the dynamic changes of flow-heat-hydrochemical fields during the dissolution process. Next, the response relationship between the thermochemical variations of reaction solutions and the coordination pattern of saturated solution mixing corrosion and temperature mixing corrosion will be investigated, and the water-heat synergistic mixing corrosion mechanism of carbonate rocks will be clarified. Furthermore, the evolution regular of the pore structure in the carbonate rocks will be summarized from the micro images and simulated data of the pore network. The study will provide theoretical and technical supports for prospecting the storage spaces of water, heat, oil and gas resources at carbonate areas.