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计算地层岩石矿物组分并形成连续变化的岩性剖面是测井解释的核心工作之一。相对于传统的POR、CRA等处理方法,最优化方法能够利用各类测井、地质信息进行综合求解,适用范围更广、计算精度更高。元素俘获能谱测井可以提供多达9种常见地层元素的重量百分含量,使得岩性剖面的计算更直接、更准确。为了充分发挥最优化方法、元素俘获能谱测井的优势,进一步提高岩石矿物组分计算的精度,本文首先确定了不同矿物的元素俘获能谱测井响应方程形式和权重系数计算方法,然后在全岩氧化物实验分析和理论计算的基础上确定了常见矿物的元素含量测井响应值,从而形成了一套完整的基于元素俘获能谱测井的多矿物最优化处理新方法。应用证明,新方法的处理结果与岩心分析结果具有较好的一致性,平均绝对误差在10%以内,其计算精度更高。
Calculating stratal rock mineral composition and forming a continuously changing lithology profile is one of the core work of logging interpretation. Compared with the traditional methods such as POR and CRA, the optimization method can comprehensively solve various well logging and geological information and has wider application range and higher accuracy. Element-trapping EDS can provide up to 9 weight percentages of common stratigraphic elements, making the calculation of lithology profiles more direct and accurate. In order to give full play to the advantages of optimization method and elemental capture EDM to further improve the calculation accuracy of rock mineral components, we firstly determine the logging response equation form and weight coefficient calculation method of elemental capture energy spectra of different minerals, Based on the experimental analysis and theoretical calculation of the whole rock oxide, the elemental well logging response of common minerals was determined, and a complete multi-mineral optimization processing method based on elemental trapping energy spectrum logging was formed. Application proves that the results of the new method are in good agreement with the results of core analysis, the average absolute error is within 10% and the calculation accuracy is higher.