自然伽马能谱测井资料在沉积地层分析中的应用  

Application of logging data based on Natural Gamma Spectrometry in sedimentary formation analysis

作　　者：王俊涛[1] 汪雅菲 耿晓光[1] 周存亭[1] Wang Juntao;Wang Yafei;Geng Xiaoguang;Zhou Cunting(Geological Survey of Anhui Province,Hefei 230001,China)

机构地区：[1]安徽省地质调查院,安徽合肥230001

出　　处：《能源与环保》2022年第1期27-32,共6页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：中国地质调查局地质调查项目(12120114019801);安徽省地质矿产勘查局科技项目(KJ2012-01)。

摘　　要：自然伽马测井能测量地层中放射性元素的总含量。通过自然伽马能谱测量,能反映不同放射性元素放射出不同能量的伽马射线,从而确定地层中含有何种放射性元素,利用其测量值可以研究地层特性,包括计算泥质含量、识别高放射性储层、研究沉积环境、评价烃源岩等。通过测井资料中的自然伽马能谱分析,研究了区内钻井中富有机质泥页岩的地层特征,探讨了区内富有机质泥页岩的生烃能力。通过测井资料的预处理以及测井解释模型和参数的选取,选择测井中自然伽马能谱资料进行分析。通过对富有机质泥页岩的泥质含量计算、岩性识别、黏土类型判别以及沉积环境分析,对曲线中的钍、铀和钾含量的分析比较,综合特征表明本井地层沉积环境为还原环境沉积。总体来看,荷塘组地层铀值分布较广,为本井地层烃源岩生烃能力最好的井段,为评价该地区的地层提供了较为可靠的信息。Natural Gamma logging can measure the total content of radioactive elements in the formation.Through the measurement of natural gamma spectroscopy,it can reflect the gamma rays emitted by different radioactive elements with different energies,so as to determine which radioactive elements were contained in the formation,and the measurement values could be used to study the formation characteristics,including calculating the mud content,identifying high radioactivity reservoirs,study sedimentary environment,evaluate source rocks,etc.The stratigraphic characteristics of the organic-rich mud shale in the drilling in the area were studied by the natural gamma energy spectrum analysis in the logging data,and the hydrocarbon-generating capacity of the organic-rich mud shale in the area was discussed.Through the preprocessing of the logging data and the selection of the logging interpretation model and parameters,the natural gamma-ray spectrum data in the logging was selected for analysis.Through the calculation of shale content,lithology identification,clay type identification and sedimentary environment analysis of organic-rich mud shale,and the analysis and comparison of thorium,uranium and potassium contents in the curve the comprehensive characteristics showed that the sedimentary environment of the well was a reducing environment deposition.In general,the uranium value of the Hetang Formation was widely distributed,which was the section with the best hydrocarbon-generating capacity of the source rock in this well,which provided more reliable information for evaluating the strata in this area.

关 键 词：有机质 页岩气 测井曲线 自然伽马能谱 沉积环境 生烃能力 

分 类 号：P631[天文地球—地质矿产勘探]