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在中子－中子测井数值模拟中，群常数的计算是提高理论计算精度的重要环节。文章探讨把核能领域的中子热化模型应用到中子测井数值模拟中来，提出了中子测井条件下的热群常数计算方法，并研制了相应的热谱计算软件ＨＧＭＩＣ。从理论上研究井温（包括水的密度变化）的影响，并制作了井温校正的理论图版曲线。
In neutron-neutron logging numerical simulation, the calculation of group constants is an important part of improving the theoretical calculation accuracy. The paper discusses the application of neutron thermal model in nuclear energy to numerical simulation of neutron logging. The calculation method of thermal group constants under neutron logging is put forward and the corresponding thermal spectrum calculation software HGMIC is developed. The effect of well temperature (including the change of water density) is theoretically studied, and a theoretical plate curve of well temperature correction is produced.