高蜡凝析油或轻质油的分布特征与成因机理

Occurrence and Original Mechanisms of High Waxy Condensatesor Light Crude Oils

介绍了中国部分含油气盆地中的高蜡凝析油或轻质油的地球化学特征及其在地域上和层位上的分布规律,并以大港千米桥古潜山高蜡凝析油气藏、吐哈盆地西部凹陷部分高蜡凝析油田或轻质油田、塔里木盆地柯克亚凝析油气田、盐城凹陷的高蜡凝析油藏为例,总结了几种高蜡凝析油或轻质油的成因模式,即煤系腐殖型烃源岩热演化生烃、运移分馏作用、混合作用或“气洗作用”等。

This paper discusses geochemical characteristics and regional and stratum occurrence of high waxy condensates or light crude oils in some basins in China. It also summarizes original mechanisms and reservoir formation models of high waxy condensates,especially in Qianmiqiao buried-hill high waxy condensate reservoir, some high waxy condensate oil-gas fields in West Depression in Turpan-Hami Basin, Kekeya high waxy condensate or light oil fields in Tarim Basin and high waxy condensates reservoir in Yancheng Depression. These models include thermal evolution hydrocarbon-generating in coal-measure source rocks,migration fractionation and mixing process or gas washing etc.