自然伽玛能谱测井在储层敏感性预测中的应用

Prediction of formation sensitivity with natural gamma ray spectrometry log used in Dagang oilfield

自然伽玛能谱测井不仅可以测得地层的总自然伽玛值,同时还能得到地层的铀、钍、钾含量,据此可以精确地确定储层的粘土矿物含量。本文以大港油田官104地区为例,提出了利用交会方法确定泥岩中各粘土矿物成分及其含量的计算方法。在此基础上,对储层敏感性参数和“五敏”伤害指数进行了单相关分析,然后利用相关系数加权法对官104地区进行了储层敏感性预测,取得了较好的应用效果。

As natural gamma ray spectrometry log can provide not only the total gamma ray of formation, but also the contents of uranium, thorium and kalium, thus the contents of clay mineral in formation can be defined accurately.Taking Guan 104 area of Dagang oilfield as a sample, a computing method of using intersection method to determine clay mineral composites in shale and to calculate its contents was presented, and single-correlation analysis of formation sensitivity parameters and five- sensitivities damage index were also conducted.Formation sensitivity of Guan 104 area has been predicated by correlation coefficient weighted method and the results were better.