Experimental Investigation on Cyclic Huff-n-Puff with Surfactants Based on Complex Fracture Networks in Water-Wet Oil Reservoirs with Extralow Permeability

Table 1

Ion composition.

Cation (mg/L)			Anion (mg/L)				Total salinity (mg/L)
Na^++K^+	Ca^2+	Mg^2+	HCO3^-	Cl^-	SO4^2-	CO3^2-
7694	245	52	458	11876	312	60	20697