Abstract: In some researches on distributing rules of remaining oil, we often describe qualitatively what it distribute in the whole reservoir according to the character of distribution in space by studying the saturation of remaining oil. To accomplish it, we shall make use of logging data. But most of them can't be finished quantitatively, and there are scarcely quantitative forecast to the distribution of remaining oil about every tiny layer in every well. This paper will make it true to finish quantitative forecast. On basis of Zhangtianqu Oil Field, it discusses something on establishment of the plot method, such as thought, process, and conditions when it adopted. On the other hand, some conclusions on distribution of remaining oil can be drew according to the result, and it will lead the way to exploitation in the future.