Abstract
The lack of research on alteration damage to reservoir rocks is one of the main obstacles to the development of geological resources using supercritical carbon dioxide (SC–CO2), and the most fundamental solution is to clarify the influence mechanism of mineral dissolution on rock mechanical damage. Starting from monomineral alteration process, the dynamic alteration effect on different minerals is analysed, and the resistance kinetics equation specific for SC-CO2 alteration is established. The dissolution of soluble minerals is prevented and the exfoliation of insoluble minerals is accelerated by the dynamic alteration effect. Through the study on multi-mineral alteration, the mutual resistance effect of resultants on the alteration of other minerals is found. On this basis, the weakening coefficients are proposed, the alteration laws of minerals and rocks are bridged, and the rock kinetics equation is constructed. Based on the highly positive correlation between alteration extent and damage degree, the mechanical damage is analysed with the theoretical alteration extent calculated by kinetics equation, and the accuracy and universality to predict mechanical damage under different conditions are verified for the same rock.
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