SEM/EDAX对混层粘土矿物的研究及其与生油关系的探讨

SEM/EDAX STUDY ON MIXED LAYER CLAY MINERAL AND ITS RELATION WITH OIL GENERATION

奚可棠

Xi Ketang

地质矿产部石油地质中心实验室

Central Laboratory of Petroleum Geology, Ministry of Geology and Mineral Resources

M-I1)混层矿物的鉴别和混合层中I百分含量的测定,是从成岩作用出发研究石油生成、运移的一项重要工作。泥岩中M-I混层矿物分析,最常用的一种分析方法是x射线粉末衍射法,但此法在某些方面尚存在问题。我们采用扫描电镜在观察形貌同时用x射线能量色散分析对M-混层矿物进行鉴别和比值测定,得到较好的效果。泥岩在成岩作用期间,由于温度的变化,使有机质和无机质成分发生了转化。A·EI福斯科罗斯等(1976年)研究粘土成岩阶段的矿物学和化学指标与有机质R°和烃类的形成建立相互关系,80年他们又研究了砂岩自生粘土中混层矿物的形成与石油的生成以及排烃时间是一致的。

The illite content in the mixed layer can be obtained by systematic micro-area component analysis of M-I (montmorillonite-illite) mixed layer minerals in claystone using SEM/EDAX in stead of x-ray diffraction. According to the study on the mixed layer clay minerals in a certain well, the diagenetic stages can be divided primarily into two stages, early and middle; and the middle diagenetic stage can be subdivided into three sub-periods, early, middle and late. According to the illite content inre the mixed layer, the geothermal history can be inferred. Four temperature zones are delimitated. The major source bed is found to be at the middle period of middle diagenetic stage. The illite content in the mixed layer is 65-75%, and its maximum paleogcotemperature was 80-120℃.

https://doi.org/10.11781/sysydz198603224