Study on the Key Influential Factors on Water Huff-n-Puff in Ultralow-Permeability Reservoir

Table 1

Ionic composition of brine water.

Ion	Na^++K^+	Ca^2+	Mg^2+	HCO3^-	Cl^-	SO4^2-	CO3^2-	Total
Concentration (mg/L)	3393	60	49	1831	4077	456	0	9866