Pollution situation of high mineralized waste water in oil field on farmland

In Jianghan oil field,the soil around the oil well has been polluted by high mineralized waste water which comes from drilling well and extracting oil and caused the decrease of the crop yield.The results from the investigation on pollution status of dry land and paddy with different polluted degrees in Qianjiang County show that the main pollutants are chloride and salt as well as cadmium and oils.In the ploughed layer of paddy,chloride and salt content of the top are higher than those of the bottom,which is on the contrary in dry land.All polluted soil fertility was decreased.