Gamma-ray spectrometry logs are verified as a qualitative analysis tool for clay minerals where clay swelling depends on the clay mineral type. The data are obtained from three random wells (Kh-24, Bassel-1X, and Hayat-1X wells) in Western Desert oil fields. X-ray diffraction, scanning electron microscopy, and gamma-ray spectrometry are performed and the swelling potential index is obtained for surface samples from the Bahariya Formation. The swelling values and the total counts of gamma radiation, equivalent Th, equivalent U, and K are plotted with correlation coefficients (r) of 0.71, 0.81, 0.62, and 0.07, respectively. The swelling percentage ranges from 33% to 110%. This swelling behavior is reflected in the great difference in the composition of the clay minerals. Active clay minerals such as montmorillonite are widely observed with mixed-layer clay, illite, chlorite, and kaolinite. The correlation coefficients clarify a strong relation occurs in the cases of total gamma radiation and equivalent Th versus the swelling index. Consequently, gamma-ray spectrometry logs provide a new approach for identifying not only clay minerals but also their swelling trend. Moreover, they help to give an expected drilling risk, such as stuck while drilling.

伽玛射线测井仪已被证明是用于粘土矿物的定性分析工具，其中粘土膨胀取决于粘土矿物的类型。数据是从西部沙漠油田的三个随机井（Kh-24，Bassel-1X和Hayat-1X井）获得的。进行了X射线衍射，扫描电子显微镜和伽马射线光谱分析，并获得了来自Bahariya组的地表样品的溶胀势指数。用相关系数绘制r的溶胀值和总辐射量，等效Th，等效U和K）分别为0.71、0.81、0.62和0.07。溶胀百分比为33％至110％。这种溶胀行为反映在粘土矿物成分的巨大差异中。在混合层粘土，伊利石，绿泥石和高岭石中广泛观察到活性粘土矿物，如蒙脱石。相关系数表明，在总伽马辐射和当量Th与溶胀指数之间存在很强的关系。因此，伽马射线能谱测井提供了一种新方法，不仅可以识别粘土矿物，还可以识别其溶胀趋势。此外，它们有助于提供预期的钻井风险，例如在钻井过程中卡住。