对于注水开发油田，通常使用放射性同位素测井测量注水井的吸水剖面。但由于不同地层其孔喉半径不同、受注入水的冲刷程度不同，当向井内注入粒径较小的放射性同位素载体后，对部分孔喉半径大、受注入水的冲刷程度严重的井，其小粒径同位素载体不是滤积在井壁附近，而是注入到探测器无法探测到的远离井筒部位，造成测量结果失真。通过改用大粒径同位素载体测量吸水剖面，不但可以提高资料的准确度，而且可以更明确地划分吸水层位。 For waterflooding oilfields, it is common to use radioisotope logging to measure the water injection profile of a water injection well. However, due to the difference in pore throat radius between different strata, the degree of flushing by injected water is different. When a radioactive isotope carrier with a smaller particle size is injected into the well, the well with a large part of pore throat radius and serious erosion by injected water, Diameter isotope vectors are not filtered near the well wall but injected into the wellbore that the detector can not detect, causing distortion in the measurement results. By using a large particle size isotope carrier to measure the water absorption profile, it not only improves the accuracy of the data, but also clears the water-absorbing horizon more clearly.