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自然伽玛刻度模型井是自然伽玛测井标准化的核心。经它标准化后的自然伽玛测井资料更有利于解释应用。四川自然伽玛刻度模型井内,高、低放射性模块的铀、钍、钾浓度和它的尺寸大小,是根据四川地层泥岩自然放射性元素的平均含量和仪器有效探测半径而设计的。本文推算了均匀介质中和有井条件下的探测半径,并介绍了高放射性模块选用天然岩样磨粉混合制作的办法。通过检验和应用,证明了该模型井符合设计要求,达到了预期的效果。
Natural gamma scale modeling wells are at the heart of standard gamma ray logging. Natural gamma log data after its standardization is more conducive to explain the application. Sichuan Natural Gamma Scale Model The concentrations of uranium, thorium and potassium in wells, high and low radioactivity modules and their size are designed based on the average content of natural radioactive elements and the effective detection radius of instruments in Sichuan formation mudstone. In this paper, we estimate the detection radius under the conditions of uniform medium and well, and introduce the method of natural rock sample milling and mixing with high radioactivity module. Through the test and application, it is proved that the model well meets the design requirements and achieves the expected result.