POLLUTION AND ENVIRONMENTAL QUALITY EVALUATION FOR SOIL IN THE OIL PRODUCTION ZONES OF AN OIL FIELD

At present， the relevant standards for soil pollution evaluation have not yet found for oil production zones． Based on which， the evaluation standard of soil factors and the graduation standard of soil pollution degree were formulated， and a joint investigation，and evaluation of oil pollution，heavy metals pollution and saline pollution，which overcome the inadequate of the single investigation，and evaluation of oil pollution in soil was carried out． Finally the soil environmental quality are evaluated． The soil pollution evaluation results showed that the present situation of soil pollution was heavy pollution level in mined oil production zones，the main factor of soil pollution was oil， other factors were warning level or clean level，but the value of Cd， total salt and pH was close to pollution initial value． The soil environmental quality evaluation results showed that each factor could reach national soil environmental quality secondary standard，but the average concent of Cd had reached the limit value of national secondary standard．