从模拟实验结果讨论石油地球化学中几个重要问题

A DISCUSSION ON SEVERAL MAJOR PROBLEMS OF PETROLEUM GEOCHEMISTRY FROM THE RESULTS OF SIMULATING EXPERIMENT

根据对未成熟生油岩模拟排烃实验研究,发现随着排烃作用的进行,生油岩中残余C_(有机)含量减少,有机质类型变差,排出物与抽提物之间存在组分及成熟度的差异。从而提出了生油岩评价、油源对比及低成熟油等值得注意的问题。

On the basis of the simulating experiment on the mechanism of hydrocarbon expulsion from immature oilgenerating rocks, the authors have found that the maturity of the samples tends to increase with increasing temperature and pressure, and meanwhile the content of Corg. in the residues tends to decrease in the processes of oil generation and hydrocarbon expulsion and organic matter also tends to evolve toward the poor type. Corg. varies in content from one evolution state to another. Also, significant differences are noticed in low carbon-number normal alkanes, main peak carbon number, and the distribution and maturity of cyclic compounds such as steranes and terpanes between expulsed oily substances and extracts from the samples in the same experiment. From the above discussion, what should be worthy to be considered in source-rock evaluation, oil-source correlation and low mature oil genesis has been proposed in the present paper.