关于有机质演化各阶段的门限值计算公式的初步探讨

本文在前人工作的基础上,结合四川盆地实际,推导出含各类(Ⅰ、Ⅱ、Ⅲ)型干酪根生油岩演化到各个阶段的八个门限值计算公式。以上二叠统生油岩运算为例,表明此计算公式在研究油气生成与圈闭形成时间的适时配套等动态问题具有实用价值。 

APPROACH TO THE CALCULATIVE FORMULA FOR THE THRESHOLD VALUES OF THE EVOLUTIONARY STAGES OF ORGANIC MATTER

Connan (1974), Hood (1975), Asamhawa (1977), Jiao Shouquan and Zhou Peijun (1982) proposed the formula of the threshold values for the maturation of organic matter based on the relationship between temperature and time.In consideration of the previous works and the fact that the maturity of oil and gas in Sichuan Basin is generally high, eight calculative formulas for the threshold values of source rocks with various types of kerogen are deduced. Taking Upper Permian of Sichuan Basin as an example, the effectiveness of those formulas applied to the dynamic evolutionary process of organic matter in various major tectonic movements in Sichuan Basin is expounded. It is further indicated that for the amount on the timing of the formation of traps with respect to the formation of large amount of oil/gas, the calculative formula is viable and could provide useful in formations.