Stress sensitivity of tight reservoirs during pressure loading and unloading process

Nai CAO,Gang LEI

Table 1 Basic physical parameters of the cores.

No. Diameter/ cm Length/ cm Original porosity/% Permeability/ 10-3 μm2 Core 1 2.45 4.84 8.26 0.05 Core 2 2.48 5.26 1 2.5 0.15 Core 3 2.47 4.97 11.2 0.12 Core 4 2.52 4.38 4.39 0.02 Core 5 2.49 5.62 6.47 0.04 Core 6 2.52 5.10 8.98 0.06