Experimental Study on the Effect of Supercritical CO₂ on Mechanical Properties and Fracture Characteristics of Longmaxi Shale

Figure 2

Prepared shale specimens. The 7 specimens in the first row were used for the test 1 at scCO2 condition; those in the second row were used for the test 2 with N₂ at the same temperature and pressure condition as test 1; those in the third row were used for the test 3 with helium gas at the same temperature as test 1.