Experimental Study on the Effect of Long-Term Water Injection on Micropore Structure of Ultralow Permeability Sandstone Reservoir

Table 1

Geological properties of the Chang VIII formation.

Property	Value	Unit
Depth	1450	m
Thickness	10-20	m
Average porosity	10.2	%
Average permeability	0.35	m
Pore pressure	6.51	MPa
Overburden pressure	12.5	MPa
Reservoir temperature	56.64	°C
Water salinity	25395	ppm