在同位素吸水剖面测井中, 沾污给测量精度带来了较大的影响。文中分析了沾污类型及沾污消除校正系数, 根据吸水剖面中分配前的同位素沾污并不影响资料解释的结果, 分配之后的沾污破坏了地层注入量、同位素滤积量及放射性强度三者之间的正比关系, 以及影响分层相对注水量的解释精度这些特点, 介绍了沾污校正的沾污面积归位模型及计算方法, 并把该方法应用于资料解释中, 取得了理想的效果。

The contamination has a great impact on the precision of measurement in isotope logging. The contamination type and contamination correction coefficient are introduced briefly. The interpretation result was not influenced before the isotopes distributed in the formation; the proportional relationship among formation injection
quantity, the filtration production content and the radioactivity intensity was destroyed by contamination after isotopes had distributed in the formation; and the interpretation accuracy for the amount of stratified relative water injection was affected. According to these characteristics, the contamination area homing model and calculation method for contamination correction are proposed, and good results have been achieved.