酸性火山事件岩层的自然伽马测井曲线特征及其应用

On the Features of Gamma Ray Response to Acidic Volcanics and Its Application

对酸性火山事件岩层的７测井曲线显示特征及地质原因作了较深入的分析。酸性火山事件粘土岩的地质产状、物质成分、特别是微量元素含量与陆源正常沉积粘土岩不同。因其中放射性元素和钾含量高，故在自然伽马测井曲线上有高异常响应特征。火山碎屑岩储集层是新型油气藏，用自然伽马测井划分生、储、盖层，并追索其横向分布范围，对油、气田远景评价有一定意义。

The features of Gamma Ray response to Acidic volcanics and their geologic cause have been analysed in detail. The geologic occurence, composition and microelements content of acidic volcanic clay are different from those of normal terrigenous sedimentary clay. Accordingly, abnormal response features on Gamma Ray log are quite apparent because of the high content of radioactive elements and potassium. Volcanic-elastic rock is a new kind of reservoir. Identification of source rock,reservoir rock and drape with Gamma Rag log and determination of their lateral distribution range are of great significance for the prospective evaluation of theoilfield.