Effect of Threshold Pressure Gradients on Control Areas Determination of Production Well in CBM Reservoirs

Table 2

Parameters of formation water from the No. 3 coal seam.

Ion concentration, mg/L						Total salinity, mg/L	Water type
Na^++K ^+	Mg^2+	Ca^2+	Cl^−	SO4^2−	HCO3^−
488.16	3.98	4.82	245.59	17.83	884.93	1645.31	NaHCO3