摘要
显微组分在热演化过程中伴随油气生成,其光学性质亦相应发生有规律的变化,其改变程度取决于其原始富氢程度。到过成熟阶段,各种类型干酪根地化特征渐趋一致,伹在光性上仍存在明显区别。本文详细研究了不同类型干酪根天然演化系列与不同显微组分热模拟产物的光学特征,系统地总结了显微组分在热成熟过程中光性演变规律,应用热模拟实验定量研究了它们在不同成熟度体积的减量。在此基础上推导出了恢复不同类型显微组分在低成熟阶段原始百分含量的计算公式。通过对典型实例的剖析,证实本方法的可靠性。笔者认为本文为解决过成熟生油岩的油气评价提供了新思路。
During maturation process of macerals, on the one hand they generate oil and gast on the other hand, their optical properties will be changed, whose alteration extent will depend on the primary abundance of hydrogen contained in macerals. Up to post-mature stage, the geochemical properties of all types of kerogen would be consistent, but their optical characteristics have some clear differences, which is the theory base to use optical method to recovery the primary types of natural kerogen. In this paper, the detailed optical characteristics of all types of natural kerogen and the thermal-simulating products of different kinds of macerals have been investigated, and a preliminary classification is suggested which subdivides post-mature kerogen into five types of maceral groups: they are vitrinite, inerinite, anisotropinite, inerinite, micrinite A and micrinite B. On the basis of the results of thermal simulating test of macerals, their reduction of volume in any maturation stage is quantitated,. According to this research, a formula to calculate the primary percent contents of all kinds of macerals in low mature stage is deduced. The reliability of this method has been testified by the analysis of a typical example. The author belives that this paper may present a new train of thought to solve the evaluation of post-mature oil source rocks.
出处
《现代地质》
CAS
CSCD
1990年第4期89-95,共7页
Geoscience
