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沉积环境的差异使得沉积物具有不同的地球物理和地球化学特征,根据沉积物的特征可以分析沉积物当时的沉积环境。自然伽马能谱测井在塔河油田中、下奥陶统地层分析中已经得到广泛应用,但是由于碳酸盐岩地层中自然放射性元素含量很低,自然伽马值一般低于10API,由此进行剥谱分析而得到的铀(U)、钍(Th)、钾(K)曲线也都很低,有时甚至出现回零现象,因此控制自然伽马能谱测井曲线质量,避免误解释是应用自然伽马能谱曲线进行测井解释的重要环节。本文介绍一种利用铀特征曲线(Ut)和钍特征曲线(Tht)对能谱测井曲线质量进行控制的方法,此方法简便易行。该方法在塔河油田中、下奥陶统碳酸盐岩地层中的应用效果明显。
The difference of sedimentary environment makes the sediments have different geophysical and geochemical characteristics. According to the characteristics of the sediments, the sedimentary environment can be analyzed. Natural gamma ray spectrometry logging has been widely used in Middle and Lower Ordovician stratigraphic analysis of Tahe oilfield. However, since the content of natural radioactive elements in carbonate stratum is very low, the natural gamma ray is generally lower than 10API. The uranium (U), thorium (Th) and potassium (K) curves obtained from this stripping analysis are also very low and sometimes even go back to zero, thus controlling the gamma ray spectrometry log curve quality and avoiding misinterpretation It is an important part of logging interpretation using the curve of natural gamma ray. This paper presents a method of controlling the quality of an energy spectrum log using uranium (Ut) and thorium (Tht) curves. This method is simple and easy to implement. The method has obvious application effect in middle and lower Ordovician carbonate strata in Tahe Oilfield.