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自然伽马测井仪器主要是测量地层中不同岩石矿物的天然放射性差异,然后以此为依据,自然伽马测井可以用于划分地层,但目前我国所用的自然伽马测井仪器,其探测的纵向分辨率仅0.5m,在早起我国石油勘探的阶段,其完全够用,但现在各油田已经开始需找隐蔽油气藏,薄层油藏等等,很多薄层厚度仅0.5以下,因此提高自然伽马的分辨率已成为实际的需要。笔者设计了一种提高现有自然伽马测井仪器分辨率的方法,通过现场9口井的实验和评价,对比分析岩心结果后认为仪器分辨率可以达到0.3m。
Natural gamma logging tools mainly measure the natural radioactive differences of different rock minerals in the strata. Based on this, natural gamma ray logging can be used to divide the strata. However, the natural gamma logging tools currently used in China, whose detection Of the longitudinal resolution of only 0.5m, early in the stage of oil exploration in our country, fully adequate, but now the oil fields have begun to find subtle reservoirs, thin reservoirs, etc., many of the thin layer thickness of only 0.5 or less, thus improving The resolution of natural gamma has become a real need. The author designed a method to improve the resolution of the existing gamma ray logging tool. Through the experiment and evaluation of 9 wells in the field, the result of core analysis was comparatively analyzed and the resolution of the instrument could reach 0.3m.