Geochemistry Characteristics of Formation water of Upper Paleozoic Gas Pool in HA Area of North Ordos

According to the statistic analysis of water data of 31 wells' formation,the formation water of the upper Paleozoic in researched Area possesses weak acidity,richer Cl-and poorer K++Na+ and Ca2+,CaCl2 type,and total dissolved solids increases with depth;P1s1 formation's total dissolved solids of western area is higher than that of eastern area in plane,which is well consisted with the dimension of fractured wells' productivity.