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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.
Geochemical elemental logging (ECS logging) can quantitatively provide chemical elements such as Si, Ca, Fe, S, Ti, Gd and other chemical elements in the stratum. The relationship between these elements and formation minerals can be used to analyze rock mineral content. ECS logging in the study area to quantitatively evaluate the rock mineral content, due to the wrong choice of the type of mineral assemblage, resulting in mineral interpretation results and core logging and logging data analysis results are biased.To address this issue, this article based on ECS logging rock 2) Improve the rapid evaluation model of calcite and gypsum by using the correlation between mineral and indicator elements, the model correlation coefficient is respectively 0.99, 0.96. The application shows that the rapid evaluation model established is more concise and has the same accuracy as the closed model of mineral. In addition, the interpretation result is more coincident with the logging and core analysis results, indicating the reliability of the method. This method can provide a new choice for logging lithology identification.