基于伽马能谱的元素测井发展历程及技术展望

Development process and technology prospect of elemental logging based on Gamma ray spectroscopy

随着对油气勘探开发的不断深入,勘探对象复杂,给测井解释评价带来极大的挑战.基于伽马能谱的元素测井是通过测量地层元素自发产生或中子源激发的次生伽马能谱,利用谱解析方法获得地层元素含量,为复杂储层测井评价提供一种有效手段.本文全面归纳总结了伽马元素能谱测井的发展历程,认为其可分为四个大的阶段:自然伽马能谱测井、地球化学测井、元素俘获能谱测井和基于脉冲中子源的元素能谱测井;并对其测井技术进行展望,认为基于伽马能谱的元素测井应遵循"三多"发展趋势,即:多功能仪器设计、多参数成果解释和多方位近钻头测量.

Along with continuously going deep into the exploration and development of oil and gas,prospecting target is more and more complex,which brings great challenges to the well logging interpretation.The elemental logging,in which natural or induced gamma ray energy spectroscopy from formation elements are recorded and the elemental contents are derived through spectral analysis,provides an effective method for logging evaluation in complex reservoirs.In this paper,the development process of elemental logging based on gamma ray energy spectroscopy is completely summarized,and four stages are thought to be in the development process：natural gamma ray spectroscopy logging,geochemical logging,elemental capture spectroscopy logging,and elemental spectroscopy logging based on pulsed-neutron source;the technology prospect is conducted,and＂three multiple＂development trend should be followed by elemental logging based on gamma ray energy spectroscopy,that is multiple-function tool design,multiple-parameter result interpretation,and multiple-azimuth near bit measurement.