石油与天然气运移聚集过程探讨

为了认清油气藏形成过程,在对油气藏概念、运移阶段及运移动力进行深入分析的基础上,指出了浮力是二次运移和聚集成藏最主要的永恒的动力。油气藏从最初形成之后普遍受到构造运动的影响发生破坏及再运移,含油圈闭中油气溢(逸)散和注入经常出现,现在勘探找到的油气藏大多数都不是原生油气藏,受构造运动的影响油气藏都具有晚期定型的特点,所以并不是圈闭形成越早越好,只要盆地有生烃能力,所有圈闭都存在形成油气藏的机会,最终能否成藏要看运移通道及保存等条件。油气从生成到聚集成藏是一个随着构造运动变化的漫长过程,油藏原始含油气饱和度是衡量油气藏变化及定型的重要指标。

DISCUSSION ON THE HYDROCARBON MIGRATION AND ACCUMULATION

In order to make clear of the process of the hydrocarbon accumulation,on the bases of the deep analyses of the hydrocarbon reservoir concept,migration stages and migration forces,the buoyancy force was presented to be the most principal and eternal force for the secondary migration and the accumulation of the hydrocarbon.Beginning with the initial formation,the reservoir is generally influenced by the tectonic movements,damaged and then the migration is once more taken place,the oil & gas in the oil-bearing traps are often escaped and enriched,all the current discovered hydrocarbon reservoirs are not the original ones,due to the influences of the structural movements,the reservoirs are characterized by the later formation,so it is not good that the earlier the traps form,the better they will be,only that the basin possesses the capacity of the oil generation,all the traps have the opportunity to accumulate into the petroleum reservoir,finally whether the reservoir accumulates or not is determined by the migration paths,conservation and so on.The process from the petroleum generation to accumulation is a slow one with the change of the tectonic movements;the initial oil (gas) saturation is one of the major criteria for measuring the petroleum reservoir change and formation.