The principal compositions of soluble materials of the Ordovician oil field water in Tahe oilfield are consistent with sea water, suggesting its marine origin. The different ionic compositions, concentration and ionic parameter indicate different geological features. No.7 area of Tahe oilfield is in a different hydrology system from others. There are abundant clay minerals and cements in the Ordovician carbonate reservoir, resulting in relatively high concentration of calcium and low concentration of natriu...

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