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本文研究中子-中子测井的数值模拟方法。应用多群P_1近似对中子输运方程数值求解。并研究其在中子测井中的应用。在国内首次实现了中子-中子测井问题的数值正演,建立了核测井用的核数据库,编制了少群群常数的计算程序FSMPlD和二维柱坐标(r.z)少群P_1近似计算程序FDMP2D。对江汉测井研究所模型井群的石灰岩、砂岩和白云岩三种岩性地层进行了稳态探管居中的实验测量与模拟计算。计算结果同实验结果相一致.用理论方法制作了各种环境校正图板曲线,计算精度是令人满意的。
This paper studies the neutron-neutron logging numerical simulation method. Application of Multigroup P_1 Approximation to Numerical Solution of Neutron Transport Equation. And study its application in neutron logging. For the first time in China, the numerical forward modeling of neutron-neutron logging has been carried out. The nuclear database for nuclear logging has been established and the calculation program FSMPlD and two-dimensional cylindrical coordinates (rz) Calculation program FDMP2D. The experimental measurements and simulation calculations of the steady-state probe centering on the three lithologic formations of limestone, sandstone and dolomite in the well group of the Jianghan Logging Research Institute are carried out. The calculated results are consistent with the experimental results.Correlation curves of various environmental correction boards are made by theoretical methods, and the calculation accuracy is satisfactory.