Study on Damage Mechanism of Waterflooding Development in Weizhou 11-4N Low-Permeability Oilfield

Table 2

Water sample ion concentration of the Weizhou 11-4N oilfield.

Water type	Cation (mg/L)			Anions (mg/L)				Total mineralization (mg/L)	pH value
	K^++Na^+	Mg^2+	Ca^2+	Cl^-	HCO3^-	SO4^2-	CO3^2-
Injection water	36.22	353.79	144.8	240.71	70.94	0.52	0	846.97	7
Formation water	2481	58	0	1427	4238	25	72	8301	7.71