摘要
基于实际井下X射线源参数,利用数值模拟方法研究Cs137源和X射线源密度测井在能谱、密度灵敏度和精度方面的差异;并对X射线源密度测井的能窗、屏蔽体和探测器等参数进行优化,提出一种四探测器密度探测系统方案。结果表明:X射线源密度测量能窗应选取0.12~0.35 MeV;仪器结构无需增加纵向屏蔽体;为了满足密度测井需求,近探测器源距应大于12.0 cm,远探测器源距应设置在29~55.5 cm;通过四探测器密度探测系统方案可以使X射线密度测井兼顾纵向分辨率、探测深度、密度灵敏度和精度等方面的优势,更加适合复杂储层评价;研究可以为X射线源密度测井仪器研发提供硬件参数指导。
This study evaluated the differences between Cs137 and X-ray density logging tools in terms of their energy spectrum,density sensitivity and precision utilizing the Monte Carlo method,based on the parameters of the actual underground X-ray source.Subsequently,optimizations were performed on the energy window,shield thickness and detector-spacings of the X-ray density tool.Eventually,a novel four-detector density detection system was proposed.The investigation revealed that the optimal energy window for the X-ray density tool should range between 0.12 MeV and 0.35 MeV.The structure of the X-ray density tool doesn t require the addition of longitudinal tungsten shielding.To ensure density sensitivity and accuracy,it was suggested that the spacing between the near detectors should exceed 12.0 cm,while the spacing of the far detectors should be within the range of 29 cm to 55.5 cm.By adopting the four-detector detection system,the X-ray density tool was conferred advantages such as high longitudinal resolution,sensitivity and accuracy concurrently,which is more suitable for complex reservoir evaluation.Overall,this research offers valuable guidance for the design parameters of X-ray density logging tools.
作者
张泉滢
刘国斌
袁超
田立立
张锋
张雪凯
ZHANG Quanying;LIU Guobin;YUAN Chao;TIAN Lili;ZHANG Feng;ZHANG Xuekai(Key Laboratory of Exploration Technologies for Oil and Gas Resources(Yangtze University),Ministry of Education,Wuhan 430100,China;College of Geophysics and Petroleum Resources,Yangtze University,Wuhan 430100,China;PetroChina Exploration and Development Company,Beijing 100007,China;Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi an 710018,China;School of Geosciences in China University of Petroleum(East China),Qingdao 266580,China)
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第1期115-123,共9页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家自然科学基金项目(41974127)
油气资源与勘探技术教育部重点实验室(长江大学)开放基金项目(K2023-03)
长江大学2023年大学生创新性实验计划项目(Yz2023039)。
关键词
密度测井
X射线源
参数优化
密度精度
密度灵敏度
density logging
X-ray source
parameter optimization
density accuracy
density sensitivity
