Abstract: This paper analyzed the stable constant value of acetic acid and metal element complex compound published since late 1980's, discovered that big difference appeared between these data and those from SOLMINEQ.88 software data base, hence modified this data base, and simulated the form of metal-organic acid complex compound with high salinity oilfield water and calculated its content in Tarim basin.The results showed that acetic acid of 16% to 69% occurred in form of Ca, Na, Mg, Sr, Al, K, Fe complex compound, AlAc^{2 +} accounted for 19% to 94 % of total aluminum quantity.And there is a close relation between AlAc^{2 +} content and pH value.

Key words: Tarim basin, High salinity, Oilfield water, Organic acid, Simulation