基于ECS测井的岩性识别方法  

New method for well logging lithologic identification based on elemental capture spectroscopy

作　　者：赵军[1] 杨阳[1] 陈伟中[2] 李进福[2] 

机构地区：[1]西南石油大学地球科学与技术学院,成都610500 [2]中国石油塔里木油田公司研究院,库尔勒843000

出　　处：《地球物理学进展》2015年第5期2342-2348,共7页Progress in Geophysics

基　　金：国家“十二五”重大专项“特低渗油藏有效开发技术”(2011ZX05013-006-008)资助

摘　　要：地球化学元素测井(ECS测井)可以定量地提供地层中的Si、Ca、Fe、S、Ti、Gd等化学元素的含量,利用这些元素与地层矿物之间的关系可以分析岩石矿物含量.在研究区利用ECS测井对岩石矿物含量进行定量评价时,由于矿物组合类型选择有误,导致矿物解释结果与岩心和录井资料分析结果存在偏差.针对这一问题,本文基于ECS测井岩性识别常规方法,提出两点改进:1),利用岩石薄片资料对ECS测井所选矿物组合进行校正;2)利用矿物和指示元素相关关系建立方解石和石膏的快速评价模型,模型相关系数分别0.99、0.96.应用表明,建立的快速评价模型计算更简洁,并且具有和矿物闭合模型相同的精度,此外,其解释结果与录井、岩心分析结果吻合度更高,说明该方法的可靠性.该方法可为测井识别岩性提供一种新的选择.Element capture service（ECS）can be used to quantitative determination of the contents of Si,Ca,Fe,S,Ti,Gd in stratum.The correlation of these elements and lithology can be used for distinct lithology.However,when using the ECS to quantitatively evaluate the mineral content,due to the incorrectly choose of mineral kinds,there is a big deviation between the result from ECS interpretation and the result from coring and logging data analysis.To solve this problem,This paper puts forward two improvements based on ECS logging interpretation methods：Firstly,using the data of rock flakes to correct the mineral kinds which were choosed to build mineral calculation model.Secondly,the rapid assessment model was built by analyzing the relationship between the choosed mines and elements,the correlation coefficients were 0.99 and 0.96 respectively.The processing of some practical data was used to illustrate the effect of this new method,and the result shows that a good accordance between ECS＇s lithology and coredescribe lithology and logging＇s lithology is gained.Above all,this new method provides a new option for logging to identify lithology.

关 键 词：ECS测井 岩石薄片 校正 快速评价模型 矿物闭合模型 

分 类 号：P631[天文地球—地质矿产勘探]