基于能谱测量的便携自然伽马标准井量值传递系统设计与实现  

Design and Implementation of Portable Natural Gamma Standard Well Quantity Transmission System Based on Energy Spectrum Measurement

作　　者：鲁保平 孙玲 秦力 秦晓红 沈彬 王江波 LU Baoping;SUN Ling;QIN Li;QIN Xiaohong;SHEN Bin;WANG Jiangbo(Logging Technology Research Institute,China National Logging Corporation,Xi’an,Shaanxi 710077,China;Manufacturing Company,China National Logging Corporation,Xi’an,Shaanxi 710077,China;Quality and Safety Supervision Certer,China National Logging Corporation,Xi’an,Shaanxi 710061,China)

机构地区：[1]中国石油集团测井有限公司测井技术研究院,陕西西安710077 [2]中国石油集团测井有限公司制造公司,陕西西安710077 [3]中国石油集团测井有限公司质量安全监督中心,陕西西安710061

出　　处：《测井技术》2021年第6期563-567,共5页Well Logging Technology

摘　　要：为提高自然伽马标准井量值传递工作效率,提高量值传递测量精度,研究一种基于能谱测量的便携自然伽马标准井量值传递系统。测量地层中放射性核素铀、钍及钾衰变产生的伽马特征能谱,并对能谱中能峰面积进行分析计算,用能峰面积计数替代原有伽马测量中的测量总计数方式,使测量结果更加精准。用工业焊条替代原有放射源刻度器,设计符合国家环保要求的新型刻度器。基于能谱测量的便携式自然伽马标准井量值传递系统相比传统自然伽马测井仪具有体积小、重量轻、易携带、不受放射源限制的优势,同时采用能谱测量方式避免了传统计数测量方式易受门槛变化、高压漂移、前放电路不稳定等因素带来计数误差大的缺点。量值传递实测结果表明,该系统既保证API量值传递精度,又为传递工作带来便利,完全可替代大直径仪器开展量值传递工作。In order to improve the work efficiency and measurement accuracy of natural gamma standard well quantity transmission,a portable natural gamma standard well quantity transmission system based on energy spectrum measurement is developed.The gamma characteristic energy spectrum generated by the decay of radionuclides uraniumi is measured,thorium and potassium in the formation,and the energy peak area in the energy spectrum is analyzed and calculated.The energy peak area counting is used to replace the total counting method in the original gamma measurement,so that the measurement results are more accurate.At the same time,industrial welding rod is used to replace the original radioactive source,and a new scale meeting the national environmental protection requirements is designed.Compared with the traditional natural gamma logging tool,the portable natural gamma standard well quantity transmission system based on energy spectrum measurement has the advantages of small volume,light weight,easy to carry and not limited by radioactive sources.At the same time,the energy spectrum measurement method avoids the disadvantages of large counting error caused by factors such as threshold change,high pressure drift and unstable preamplifier circuit.The measured results of measurement value transmission show that the system not only ensure the accuracy of API measurement value transmission,but also bring convenience to the transmission work.It can completely replace the large-diameter instrument to carry out measurement value transmission.

关 键 词：伽马特征能峰 刻度器 探测器 总计数 便携量值传递系统 

分 类 号：P631.84[天文地球—地质矿产勘探]