Abstract：Along with constant deepening of oilfield development and higher and higher water cut in maturing field,it is very difficult to use ordinary analytic tool for quantitative analyses of water-flushed and watered levels of oil-bearing strata,residual oil distribution and crude oil contents in high water-bearing stage.Especially for minor layer,it brings larger difficulty to stable oil production and controlling waterflood,and increasing recovery ratio because of large lithologic variation,serious non-homogeneity and non-uniform water-flushed level.Finely studying residual oil distribution in minor layer,which provides scientific basis for adopting engineering measures purposefully and increasing recovery ration,is important job of later development in oilfield.Using geo-chemical log technique to study the residual oil distribution in oil-bearing strata is an important supplement to reservoir study.His application value lies on quantitative interpretation and evaluation,which can solve such issues as residual oil saturation and watered situation of oil-bearing strata during the oilfield development.
