低成熟石油烃源岩的动力学研究

本文介绍了对东营凹陷下第三系沙河街组沙四段上部具有不同自然熟化程度的低成熟石油烃源岩进行动力学研究的结果。结果表明，浅埋藏、低成熟、低有机丰度且与碳酸盐岩相关的源岩具相对较高的烃产率和平均活化能；平均活化能可能会掩盖低熟成烃特征。依据研究结果，指出当前进入门限埋深以下且具有低活化能生烃母质存在的牛１１样品可能在浅埋藏、低成熟时曾为该区（八面河低熟油田）低成熟石油的形成提供了油源。另外，笔者通过对样品可溶有机质抽提前后活化能分布对比研究，指出了低活化能分布范围内的生烃母质主要为可溶有机质。并且进而提出本区低成熟石油的成油下限埋深划分至２８００ｍ为宜，其对应的下限反应活化能不超过１７７ＫＪ/ｍｏｌ。

Kinetic Studies of Source Rocks of Immature Oils

This paper shows the results that source rocks of immature oils, which were gathered from the layer of the Upper E Dongying depression, were studied by using kinetic method. These results show that source rocks with shallow-buried, immature, low organic matter abundance properties and related to carbonate rocks can possess a higher rate of hydrocarbon generation and higher average activation energies. Based on these cognitions, it was pointed out that average activation energies might cover the characteristics of immature hydrocarbon generation. Through studies of activation energy distributions of 4 samples, it was supposed that the source rocks which have low activation energy distribution and are now located under the burial depth of mature threshold perhaps used to produce immature oils for the Bamianhe immature oil field, for instance the Niu 11 sample. To determine what materials of the low activation energy distribution range are, the activation energy distributions of soluble organic matters was compared with that of the unextracted sample and it was discovered that materials within the low activation energy distribution range are mainly soluble organic matters. In addition, it was shown that the deepest burial depth of generating immature oils is about 2800 meters in study area and the corresponding activation energy about 177 KJ/mol.