摘要
镜质体反射率是用来反映有机质热演化史的主要指标。光性测定表明,一般情况下有机质各显微组分的光性特征与一轴负光性晶体相似,至无烟煤阶段与二轴光性物质的特征接近。有机质的反射光性可以用函数和统计数学关系式表达,其各个分量之间有内在的联系。影响反射率大小的决定因素是其分子结构和组成,并且主要与芳香核的多少及其排列的紧密程度有关。各显微组分反射率总体规律是:惰质组>镜质组>壳质组>类脂组。随着热演化的进行,有机质母体芳香环周围官能团及侧链逐渐脱落,芳香核进一步缩合及其有序排列,导致反射率持续增大,同时至高成熟阶段,各显微组分的母体的组成结构差异减少,所以反射率差值亦减小。文中还论述了各显微组分间反射率的不同,初步探讨了其内在原因,并提出了实际工作中应注意的事项。
The vitrinite reflectance is considered as an important index reflecting the thermo-evolution history of organic materials.Optical measurements indi- cate that the optical features of each organic material is similar to those of the monoaxial optical-negative-crystal usually,and approach to those of the materials with twin axes during the anthrazite period.The reflactivity of organic materials in which there are inherent relationships between each co- mponent can be described by mathematical functions and statistical data. The reflectance,which depends on the stractures and compositions of mole- cules,is chiefly related to the amount of the tightness and the aromatic nu- cleis.The vitrinite reflectance of materials are regulated by:inertinite>vitr- inite>exenite>liptinite.With the development of theromevolution,the refle- ctance increases gradually by the breaking,of the side chains and heteoatomic functional groups away from aromatic nucleis of organic materials and,by condensing of the aromatic nucleis and its orderly arrangment.During the high maturation period,the difference of reflectances decreases with decrea- sing of the basic structural difference between materials.This paper has made some commences oa the difference of reflectances between materials and its inherent reasons and pointed out problems on which attention should be paid in practice.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1990年第4期21-29,共9页
Petroleum Exploration and Development
