电子探针背散射电子图像在碳酸盐岩微区分析中的意义

秦玉娟,张天付,胡圆圆,朱 吟

电子探针背散射电子图像在碳酸盐岩微区分析中的意义

秦玉娟1,2,张天付1,2,胡圆圆1,2,朱 吟1,2

(1. 中国石油杭州地质研究院;2. 中国石油集团碳酸盐岩储层重点实验室,浙江 杭州 310023)

 

摘 要:碳酸盐岩成分虽然简单,而结构却非常复杂,微区分析显得尤为重要。因显微镜等常规仪器性能有限,难以用来进一步提高微区分析的精度。电子探针的使用则大大提高了微区分析研究的精度与深度。使用该仪器能对研究对象进行几千倍甚至十万倍的显微结构观察,可以发现高清晰的微米级、纳米级的微观地质现象;同时可以定位分析相应微观结构的成分,即将化学成分与显微结构一一对应起来,真正实现原位、可靠地精细微区分析。本文重点研究了电子探针中的一种最重要的图像——背散射电子图像,在碳酸盐岩微区分析中所起的作用。除了其在上述显微结构与微区分析精确定位方面的意义之外,它在岩石矿物识别方面的意义也不容小觑。

关键词:背散射电子图像;电子探针;显微结构;微区分析;碳酸盐岩

中图分类号:P575P588.15  文献标识码:A  doi:10.3969/j.1000-6281.2013.06.005

 

The Significance of A Back-Scattered Electron Image (of EPMA) in Micro-area Analyses of Carbonate Rocks

QIN Yu-juan1,2Zhang Tian-fu1,2Hu Yuan-yuan1,2Zhu Yin1,2

   1 PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023,China

   2 Key laboratoryof Carbonates Reservoirs, CNPC , Hangzhou 310023,China

Abstract:Though the compositions of carbonate rock are simple, its structure is rather complicated, so micro probe analysis is very important for the investigation.However, the conventional apparatus,such as the optical microscope, has no further capabilityto improve the studying precision of the micro-area analyses of carbonate rocks.But the advanced apparatus like EPMA has the ability to enhance greatlyboth the research precision and profundity. It can magnify the object by thousands of times, and even one-hundred-thousand times. The images acquired can distinctly show microscale to nanoscale microtextures. At the same time, the elements can be analyzed correspondingly.By connecting the microtextures with chemical compositions of a sample, EPMA performs in situ and credible micro-area analyses accurately. In this paper, the author emphasizes a sort of foremost image in EPMA, namely a Back-Scattered Electron Image(BSEI), which plays a leading role in the micro-area analyses of carbonate rocks. Besides the significance in studying microtexturesand positioning preciselyfor element analyzing, the significance in identifyingminerals is also crucial.

Key words: BSEI  EPMA  Microtexture Micro-area Analyses  Carbonate Rocks

 

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