Effect of Multistage Thermal Cracking on Permeability of Granite

Figure 2

Schematic sample assembly in HTHP vessel. 1, cover; 2, secondary axial pressure pad; 3, sample; 4, main axial pressure pad; 5, pyrophyllite powder; 6, sodium chloride; 7, confining pressure pad; 8, thermocouple; 9, pressure vessel interior layer; 10, pressure vessel outside layer; 11, axial pressure; 12, confining pressure; 13, AE receiver; 14, gas inlet; 15, gas outlet; 16, red copper sheet; 17, phlogopite sheet; 18, heating resistor sheet.