| 摘要: |
| 目前黏土矿物分析主要依据XRD衍射峰的峰高或峰面积统计量, 为了分析两种统计量计算黏土矿物相对含量的差异。对取自黄海的YSZD02岩心短柱开展了黏土矿物XRD测试, 分别利用峰高和峰面积表示4种主要黏土矿物蒙皂石、伊利石、高岭石、绿泥石的相对百分含量, 探究两种统计量表示黏土矿物相对含量随深度变化的差异, 结果发现两算法都能显示黏土矿物的相对组成特征, 对YSZD02岩心而言, 其黏土矿物主要为伊利石, 其次为高岭石, 再次为绿泥石, 最次为蒙皂石。两种算法得到的4 种矿物的相关系数由高到低依次为: 高岭石0.94, 绿泥石0.93, 蒙皂石0.82, 伊利石0.73,呈正相关。峰面积法求4 种矿物的相对含量随深度变化的离散程度比峰高法大。用峰高、峰面积法表示黏土矿物相对含量随深度的变化, 两种方法相对差异由小到大依次为伊利石, 高岭石, 绿泥石和蒙皂石。以上结果表明两种算法既有共性又有明显的差异。随着分析技术的不断更新, 相较于峰高法较难解决的误差问题, 未来峰面积法会得到更广泛的应用。因此研发更精确的计算机分析软件、统一研究方法将是未来发展的必然趋势。本文的研究加深了对峰高与峰面积统计量的理解, 为其他分析方法的比较与选择提供了参考。 |
| 关键词: 黏土矿物 相对含量 X 射线衍射 峰高法 峰面积法 |
| DOI：10.11759/hykx20160508001 |
| 分类号: |
| 基金项目:国家自然科学基金项目(41376052, 41030856) |
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| Difference between peak-height and peak-area methods in extracting relative contents of core clay minerals |
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ZHANG Zhao-peng,CHU Zhong-xin,LI Ying-kun
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| Abstract: |
| Relative contents of clay minerals are currently extracted based mainly on the peak-height or peak-area of XRD (X-ray Diffraction) peaks. To analyze the differences between the use of these two measurements, XRD is conducted on YSZDO2 core obtained from the Yellow Sea. Relative contents of four main kinds of clay minerals (smectite, illite, kaolinite, and chlorite) are extracted using the peak-height and peak-area methods, respectively, and differences between the data obtained from each is explored to determine the relative composition of clay minerals with depth. Results show both methods are able to extract and indicate the relative composition of clay minerals. Clay minerals of the YSZDO2 core mainly include illite, kaolinite, chlorite, and smectite (from highest to lowest content). The correlation coefficient of these four clay minerals using both methods shows a positive correlation; in descending order: kaolinite (0.94), chlorite (0.93), smectite (0.82), and illite (0.73). However, the variance in clay mineral data from the core with depth extracted by the peak-area method is greater than that of the peak-height method. The defined relative difference between the two methods indicates that the depth of the relative content of clay minerals can be ranked from lowest to highest as illite, kaolinite, chlorite, and smectite. The above results show that although both methods have common characteristics visible differences are evident. It is considered that with the application of new technology, the peak-area method will be more extensively used compared to the peak-height method, which has error problems that are difficult to solve. In addition, future developments in more precise computer analysis software and greater unity of research methods are inevitable in the future. This paper enables and increased understanding of the peak-height and peak-area methods and acts as a reference for the comparison and selection of other methods. |
| Key words: clay minerals relative contents x-ray diffraction peak-height method peak-area method |
