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油田污水经处理后回注，既避免了环境污染，又达到了注水保压的目的。但注水过程中，注入水必然要与储层岩石、流体接触，并发生各种物理化学作用，从而导致储层渗透率恶化，使地层受到伤害。此外，不合格的注水入还会引起集输系统和井筒的腐蚀和结垢，从而大大降低注水效果。为了避免和减少这些不利因素，必须对注入水的水质进行评定，确定合理可行的水质指标，从而达到保护油气层、提高彩收率的目的。文章立足于多年来轮南油田注入

ANALYSIS AND EVALUATION OF ACTUAL SIT-UATION OF RECYCLE WATER QUALITYGUIDELINE IN LUNNAN OIL FIELD

The recycle of the oil field water after being treated can not only aviod environmental pollution but also achieve in keeping the pressure by waterflooding.In the process of waterflooding,the injected water will contact inevitably with the rock and fluid in reservoirs and various physical and chemical actions will happen,causing thus the reservoir permeability to go bad and the formation to be damaged.In addition,the unqualified injected water will cause the gathering and transporting systems and borehole to be corroded and will form scale in them,which will greatly reduce the waterflood effect.To avoid and reduce these unfavorable factors,the injected water quality must be evaluated and the rational and practicable water quality guideline must be determined to protect oil and gas reservoirs and to improve oil recovery.In this paper,based on the experiment and research data of the injected water quality in Lunnan oil field in many years,the actual situation of the injected water in Lunnan oil field is analyzed and discussed and the chemical indices(content of the iron,dissolved oxygen,sulfide,carbon dioxide and oil and corrosion rate),the bacterial index,the physical indices(content and particle diameter of the suspended substance) and the compatibility of injected water with formation water,etc.are evaluated one by one.