Scratch Mechanics After CO2-Rock Interactions

Conventional mechanical methods are difficult to evaluate the differentiated characteristics of grain layer mechanics in supercritical CO2-water softening mechanism. This chapter introduces the changing law of the mechanical properties of grain layer shale scratches under fluid action. Based on the nano- and centimeter-scratch techniques and microscopic electron microscopy, the mechanism of change in the microscopic pore structure, mineral composition, and mechanical properties of the grain layer shale under CO2-water action is highlighted, and the differentiated changing law of the grain layer with different mechanical properties under fluid action is explored.