An Experimental Study to Reduce the Fracture Pressure of High Strength Rocks Using a Novel Thermochemical Fracturing Approach

Table 4

Comparison of ultrasonic velocities, dynamic Poisson’s ratio, and dynamic Young’s modulus before and after thermochemical treatment.

Parameters	Before thermochemical fracturing	After thermochemical fracturing	Percentage reduction
P-wave velocity (m/s)	4035	3000	25.65
S-wave velocity (m/s)	2175	1800	17.24
Dynamic Poisson’s ratio	0.30	0.22	26.67
Dynamic Young’s modulus (GPa)	34.43	22.19	35.55