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在密闭体系中压力高达3GPa,温度高达700℃的条件下进行了褐煤加水的模拟实验,分析了实验产物中的烷烃生物标志化合物的变化规律,并讨论了高压高温对有机质演化的影响.实验结果表明,高压抑制了液态烃的生成,使高峰值后移;相同压力条件下,温度升高有利于有机质的成熟演化;压力增加会抑制或延迟油气的生成和有机质成熟.高碳数烷烃在地幔高压力条件下仍可以存在,这不仅突破了“生油窗”的传统概念,而且还加深了在异常高压高温区寻找油带富集区的认识.
In a closed system, the pressure up to 3GPa, the temperature up to 700 ℃ under the conditions of lignite water simulation experiments, analysis of the experimental products of alkanes and biomarkers of variation, and discusses the impact of high pressure and high temperature on the evolution of organic matter.Experimental results The results show that the high pressure suppresses the generation of liquid hydrocarbons and makes the peak shift backward.Under the same pressure conditions, the increase of temperature is beneficial to the mature evolution of organic matter.The increase of pressure will restrain or delay the formation of oil and gas and the maturation of organic matter. It can still exist under high pressure conditions, which not only break through the traditional concept of “oil-generating window” but also deepen the understanding of looking for the oil-rich zone in the abnormally high pressure and high temperature area.