测井技术2025，Vol.49Issue(4)：531-537,7.DOI:10.16489/j.issn.1004-1338.2025.04.005
基于滑动能窗的γ密度测井方法研究
Gamma Density Logging Study Based on Sliding Energy Window
摘要
Abstract
To reduce the impact of gap fillings(mud cakes)on measurement results in γ density logging and improve logging accuracy,a sliding energy window method is studied based on the positive correlation between mud cake thickness,density,and peak shift degree;the influence law of mud cake properties on energy spectrum deformation is analyzed;personalized parameter groups and formulas are obtained through fitting sliding energy window counts of known density and mud cake thickness combined with linear interpolation;and forward and inversion verifications are conducted using experimental energy spectrum data from standard wells 4 to 9.The research results show that:①The influence law of mud cakes is that mud cakes of the same type and thickness cause the same degree of energy spectrum peak shift in different formation calibration wells;heavy mud cakes cause much greater peak shift than light ones;and for the same type of mud cake,the greater the thickness,the greater the shift degree.②The sliding energy window method can reduce the logging error of the compensation method in most calibration wells and mud cake thicknesses in forward verification,and the calculation error in inversion verification is lower than that of the fixed energy window method.③In the sliding window averaging method,the effect is better when the sliding window range n=5 and 9.④This method reduces the average relative error of density logging in standard wells 4 to 9 from 2.08%of the fixed energy window method to 0.67%.It is concluded that the sliding energy window method effectively reduces the impact of mud cakes on γ density logging and significantly improves the accuracy of γ density logging when mud cakes are present.关键词
γ密度测井/双源距补偿/滑动能窗/测井准确度/峰位偏移/康普顿散射计数/泥饼厚度Key words
gamma density logging/dual-source distance compensation/sliding window/logging accuracy/peak shift/Compton scattering count/mud cake thickness分类
天文与地球科学引用本文复制引用
安旅行,岳灿,褚庆军,何宇航,刘宇新,张清民..基于滑动能窗的γ密度测井方法研究[J].测井技术,2025,49(4):531-537,7.基金项目
国家重点研发计划项目"超短脉冲中子发生器"(2023YFF0718500) （2023YFF0718500）
中国石油天然气集团有限公司科技项目"人工放射源发生器与探测器关键技术研究"(2025ZG54) （2025ZG54）
中国石油集团测井有限公司项目"测井新方法新探测器关键技术研究"(CNLC2022-9C04) （CNLC2022-9C04）
中国石油集团测井有限公司项目"测井仪器环境校正方法及图版配套与软件开发"(CPL2022-9C01) （CPL2022-9C01）
