The Experimental Investigation of the Development Potential of Low-Permeability Reservoirs in the Daqing Oilfield

Table 1

The ionic compositions of the injection water and formation water.

Simulated water	Cation concentration (mg·L^-1)			Anion concentration (mg·L^-1)			Salinity (mg·L^-1)
	Na^++K^+	Ca^2+	Mg^2+	HCO^3-	Cl^-	SO4^2-
Injection water	28.3	64.1	21.9	350.0	8.9	11.5	484.7
Formation water	2013.9	116.2	19.5	1034.9	2559.5	14.4	5758.4