Abstract:

According to predecessor's research materials, the chemical characteristics of oil field water in continental sedimentary basin of China are: wide-ranged fluctuation of mineralization degree; obvious ion separation; higher content of sulfates; containing of many miniature elements，such as，I，Br, B etc; positive isotope , negative :and richly accumulated organic materials. The article further points out that the occurence of the chemical characteristics of oil field water is chiefly restricted by different depositional environments and conditions at last, the author approaches the classification of continental oil field water，and believes that it remains to be further discussed that the classification of continental oil field water according to the variation coefficient of ion composite is applied to the west and South-west of China.

Key words: Continental oil field water, Chemical characteristics, Ion composite, Variation coefficient