Abstract: Based on the evidence of the mudstone of the Upper Shahejie group (Es₁²)of paleogene from Dakoung oil field and the results of our simulation experiments,evolutioary characteristics of petroleum in Bohai Bay have been observed,showing that the various organic components have undergone alterations with increasing depth of burial(temperature,pressure) both in quality and in quantity.Their alteration characteristics and degrees of alteration are associated with certain thermodynamic conditions. And to some degree they are also controlled by the time span during which they are under the action of temperature and pressure.It has been determined that the threshold depth of petroleum genesis is at 2500 m.or so (relative temperature range 85～90℃),and even at 3500 m.,which is still the most favourable zone to generate petroleum.

摘要： 近年来,随着干酪根生油理论的进展,人们对石油的演化(即石油的生成、发展以至氧化变质)极为重视。不同学者在不同地区进行了广泛的研究。他们在对石油演化阶段的划分、各阶段临界温度的确定、原油组成特性的变化等诸方面都取得了重大的进展,初步建立了石油演化模型。但上述研究大多侧重在海相及河口三角洲相生油环境。对于象我国这种有特征性的陆相生油盆地研究甚少。本文拟在对典型地段进行解剖的基础上,结合人工模拟实验,探讨渤海湾盆地黄骅拗陷石油的演化特征。