基于钾含量校正的黏土矿物分析与低电阻率识别应用  

Application of Clay Mineral Analysis and Low Resistance Identification Based on Potassium Content Correction

作　　者：郑炀 崔云江 陆云龙 关叶钦 

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《测井技术》2017年第6期671-675,共5页Well Logging Technology

基　　金：中国海洋石油总公司重大专项渤海典型低孔低渗油气藏勘探开发关键技术研究及实践(CNOOC-KJ 125ZDXM07LTD 01TJ)

摘　　要：黏土矿物是储集层的重要组成部分,其含量和类型对油田的勘探开发有着较大的影响。自然伽马能谱测井能分别测出地层中铀(U)、钍(Th)、钾(K)的含量,且利用Th、K含量交会图能够确定地层的黏土矿物类型。由于K含量往往会受到钾长石的影响,不能正确指示地层的黏土矿物。对K含量曲线进行校正,校正结果与岩心分析结果吻合度较高,并基于Th、K含量交会图,准确识别了地层中的黏土矿物类型。采用多元回归法,分层段建立了黏土矿物类型含量的计算模型,运用这些模型对CFD油田的黏土含量进行计算,计算结果与岩心分析结果吻合度较高。对CFD油田低电阻率油层的成因进行了分析,为低电阻率油层的识别提供了可靠的依据。Clay mineral is an important part of reservoirs,which content and type have great influence on the oilfield exploration and development.Natural gamma ray spectrometry logging can detect the formation of Uranium（U）,Thorium（Th）and Potassium（K）,and the formation of clay mineral types can be determined by Th—K crossplot.Due to the K content is often affected by potassium feldspar,it cannot correctly indicate the clay mineral formation.The K content curve is corrected,and the calibration results are in good agreement with the core analysis results.Based on Th—K crossplot,the types of clay minerals are accurately identified.The calculation model of clay mineral type content is established by stratified regression method.These models are applied to calculate the clay content in CFD oilfield,and the calculated results are in good agreement with the core analysis results.The causes of low resistivity oil reservoirs in CFD oilfield are analyzed,which provides a reliable basis for the identification of low resistivity reservoir.

关 键 词：自然伽马能谱测井 黏土矿物类型 K含量曲线的校正 交会图 低电阻率油层 

分 类 号：P631.84[天文地球—地质矿产勘探]