Pressure-Predicting Model for Ultralow-Permeability Reservoirs considering the Water Absorption Characteristics of Mudstone Formations

Table 5

Average value of the physical parameters of an actual reservoir.

	Mudstone formations	Sandy mudstones	Transition layers	Reservoir
Oil-water well spacing (m)	210	210	210	210
Thickness (m)	4.2	4.6	6.4	9.6
Threshold pressure gradient (MPa·m^-1)	—	0.502	0.157	0.034
Porosity (%)	—	5.98	7.12	15.86
Permeability(10^-3 μm^2)	—	0.124	0.542	4.453
Average elastic compression coefficient (10^-2 MPa^-1)	—	1.04	2.83	4.67