孔径对γ测井饱和模型内部辐射场影响的计算  

Study on the Effect of Aperture on the Internal Radiation Field ofγ-ray Logging Saturation Model

作　　者：杜一滨 唐晓川[1] 张翔[1] 沈长枫 DU Yibin;TANG Xiaochuan;ZHANG Xiang;SHEN Changfeng(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang,Hebei 050002,China;Hebei Airborne Survey and Remote Sensing Technologies Co.,Ltd,Shijiazhuang,Hebei 050002,China)

机构地区：[1]核工业航测遥感中心,河北石家庄050002 [2]河北航遥科技有限公司,河北石家庄050002

出　　处：《铀矿地质》2024年第5期974-980,共7页Uranium Geology

基　　金：中国核工业地质局铀矿地质项目“砂岩型铀矿勘查含量模型井研制”(编号:202242-3);国家国防科工局核能开发项目(编号:科工二司[2020]1192号);中核集团集中研发科研项目“砂岩型铀矿先进地球物理勘查技术及应用研究”(编号:WDC-2024)联合资助。

摘　　要：γ测井模型,可用于校准铀矿勘查领域的γ测井仪,为我国铀矿勘查提供计量保障。研究其内部辐射场分布规律尤为重要,可为标准建造和量值确定提供理论基础。文章为讨论模型孔径参数对模型内部辐射场强度的影响,开展了孔径变化对饱和模型中心点γ射线辐射强度影响因素分析,并以现有规格γ饱和模型体源为例,通过γ辐射场理论计算及蒙特卡洛模拟方法研究,得到了模型中心点γ射线辐射强度与孔径的协变关系。结果表明现有饱和模型体源钻孔半径r_(0)≤6.5 cm时,孔径对模型中心点γ射线辐射强度影响<5%,满足γ测井仪的校准需求,可为后续开展模型制作时对钻孔参数调整提供理论参考。γ-ray logging model is used to calibrate gamma logging instrument and provide measurement guarantee for uranium exploration in China.Therefore,it is very important to study the distribution law of radiation field,which can provide theoretical basis for standard construction and quantity determination.In order to discuss the influence of borehole aperture parameters on the intensity of radiation field inside the model,the influence factors of aperture changes on the intensity ofγ-ray radiation at the center point of the saturated model were analyzed.The volume source of existing standardγ-ray logging saturated model was used to study the the covariant relationship between the intensity ofγ-ray radiation at the center point of the model by theoretical calculation with Monte Carlo Simulation method.The results showed that when the volume source of borehole radius of the saturated model is less than 6.5 cm,the influence of the aperture on theγ-ray radiation intensity at the center point of the model is less than 5%,which meets the calibration requirements of theγ-ray logging instrument,and can provide a theoretical reference for the adjustment of drilling parameters in the subsequent model fabrication.

关 键 词：饱和模型体源 井径 γ场理论 蒙特卡洛模拟 铀矿勘查 

分 类 号：P631[天文地球—地质矿产勘探] P624[天文地球—地质学]