Interwell tracer test hasn't been widely used for many years because only average parameters from injector to producer can be determined from interwell tracer test data. In order to get more useful information, a three-dimension two-phase (oil, water) four-component (oil, water, partitioning tracer and non-partitioning tracer) mathematical model has been established and the tracer numerical interpretation model has been developed. Based on this model, the pressure, saturation and tracer concentration can be obtained, then the distribution of remaining oil saturation can be obtained by matching the tracer production curve numerically, and this is very important for the later development of the oil field. This paper presents the basic theory of how to get the information of remaining oil saturation from the data of interwell tracer test. Tracer test data of 76-30 well group of the Guan-104 fault block in Dagang oil field have been analyzed by this model. The distribution of oil saturation from this model is consistent with the result of reservoir performance and geological analysis. So it is concluded that this model is accurate and reliable. With the development of the interpretation method, interwell tracer technique will play more and more important role in waterflooding oil fields.%在油藏数值模拟的基础上，建立了利用井间示踪剂确定剩余油饱和度的三维两相四组分问题的数学模型，并研制了相应的数值模拟软件，解决了长期以来井间示踪剂测试只能求出注水井到生产井之间的平均地层参数的问题。模型中考虑油、水两相，油组分、水组分、分配性及非分配性示踪剂4个组分，建立4个组分的质量守恒方程。通过求解可得压力、饱和度及示踪剂浓度，最后将计算的示踪剂产出曲线与实测的示踪剂产出曲线相拟合，可反求油层参数，得到目前的剩余油饱和度分布。以大港油田官104断块76-30井组的示踪剂测试为例进行了分析，由示踪剂产出曲线拟合得到了该井组目前的剩余油饱和度分布。用该方法所得的剩余油饱和度分布与油藏动态及地质上的分析结果基本一致，表明该方法是准确可靠的。图3参4 (李淑霞摘)
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