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碳氧比（Ｃ／Ｏ）测井主要用于计算储集层中的含油饱和度，进而判断油水层。用Ｃ／Ｏ测井确定气液界面是Ｃ／Ｏ测井应用的一个新的尝试，本文介绍了用Ｃ／Ｏ测井确定气液界面的原理和在喇嘛甸油田的实际应用，说明用Ｃ／Ｏ测井确定气液界面无论在原理上还是在实际应用上都是切实可行的。
C / O logging is mainly used to calculate the oil saturation in reservoirs, and then determine the oil-water layer. Using C / O logging to determine the gas-liquid interface is a new attempt of C / O logging application. This paper introduces the principle of C / O logging to determine gas-liquid interface and its practical application in Lamadian Oilfield. The / O logging confirms that the gas-liquid interface is practicable both in principle and in practice.