摘要
乙二醇(EG)处理定向样品的X射线衍射谱图上有无17A衍射峰,是区分伊利石/蒙皂石无序间层和伊利石/蒙皂石有序间层的重要标志。 实验证明,对于纯样品,伊利石/蒙皂石无序间层矿物的17A衍射峰强度变化主要决定于间层比(S％)的大小;对于天然样品,尤其是含有分散伊利石的天然样品,伊利石/蒙皂石无序间层矿物的17A衍射峰强度除了受间层比的影响以外,还受样品中该间层矿物相对含量的影响,即受其它伴生矿物,尤其是分散伊利石相对含量的影响。本文根据具不同间层比的纯伊利石/蒙皂石无序间层矿物与分散伊利石以不同比例的混合样品的X射线衍射分析结果,提出一种适用于天然粘土样品分析的伊利石/蒙皂石无序间层矿物的间层比计算方法,同时还介绍天然粘土样品分析的伊利石/蒙皂石有序间层矿物的间层比计算方法。
The 17A reflection of the XRD pattern of oriented preparation ethy-lene glycol-solvated sample is an effective indicator to distinguish the disorderly from orderly ( IS-ordered and ISII-ordered ) illite/smectite interstrata.
The experiments in this paper shows that the 17A reflection intensity of disorderly interstratified illite/smectite varied mainly with the proportion of smectite layers ( S% ) for the pure sample rather than with the proportion of smectite layers (S% ) , but also with the disorderly interstratified illite/smectite content ( I/S(%) ) and other types of mineral contents, especially the content of discrete illite (I(%)) for the mixtures. From the XRD data of mixture samples composed of disorderly interstratified illite/smectite with two different proportions of smectite layers (S% ) and different contents of discrete illites (I/S(%)), a precise procedure on the proportion of smectite layers ( S% ) calculation suitable for disorderly interstratified illite/smectite analysis of natural clay samples has been deduced.
In the paper, a precise procedure on the proportion of smectite layer calculation suitable for orderly interstratified illite/smectite analysis of natural clay samples also has been deduced based on the data of Srodons publication ( 1984 ) and author's practical XRD analyses
出处
《石油实验地质》
CAS
CSCD
北大核心
1991年第4期408-418,共11页
Petroleum Geology & Experiment
