Abstract: Rock-physical interpretation chart is usually used in quantitative prediction of reservoir lithology and fluid, and has achieved good application effect. Time-lapse seismic is used in reservoir monitoring and qualitative or semi quantitative interpretation of residual oil and gas. With the development of oil or gas fields, more accurately interpretation of remaining oil or gas distribution is required. This paper discusses a method of quantitative interpretation of remaining oil or gas by using time-lapse seismic information. By constructing the relationship chart between the change of reservoir fluid characteristic parameters (such as fluid saturation, pressure, etc.) and the change rate of time-lapse seismic sensitive parameters, the rock-physical interpretation chart representing a static time point is replaced by a dynamic physical interpretation chart changing with fluid, so as to realize the quantitative interpretation of the thickness and distribution of the remaining oil layer and reduce the interpretation ambiguity. The application in S Oilfield has achieved good application effect, and the predicted result of residual oil thickness is highly consistent with the measured result, which effectively guides the optimization of production well location in the study area and reduces the development risk.

Key words: rock physical properties, fluid factor, time-lapse rock-physical interpretation chart, quantitative interpretation, residual oil prediction