辽河断陷西部凹陷原油的地球化学特征及对辽东湾油气性质的预测

辽河断陷西部凹陷是我国油气资源异常丰富的凹陷之一。本文主要研究了西部凹陷原油的地球化学特征,对其进行了油源分类,并分析了各类原油的成因。研究结果说明:(一)在辽河断陷盆地中,不仅凹陷可以做为一个独立的生油体系,而且凹陷之中的各个洼陷同样控制着油气的生成与聚集。生油基本单元是洼陷,各类原油围绕着自己的生油洼陷独立展布,油气运移是短距离的。(二)西部凹陷原油及生油岩中,姥/植比的分布和演化规律都比较清晰完整,这对于研究油气生成问题有着重要意义。(三)辽东湾海域内油气的性质可认为是西部凹陷油气分布规律的延续,因此预测辽东湾海域内原油可能属于Ⅰ型和凝析油型原油。

GEOCHEMICAL CHARACTERISTICS OF CRUDE OIL IN WESTERN LIAOHE DEPRESSION AND FORECAST OF THE PROPERTIES OF OIL AND GAS IN LIAODONGWAN DEPRESSION

western Liaohe depression is one of the depressions rich in oil and gas resources in China. This paper mainly studies the geochemical characteristics of oil in its western depression, classifies its oil resource and analyses the origin of all kinds of oil.The result shows : In Liaohe deprssion basin, not only the depression can be an independent source system, but also each secondary depression in it can control the formation and accumulation of oil and gas. The secondary depression is an oil-formation.