白音查干凹陷油藏烃类非均质性及充注史分析

应用油藏地球化学原理，从研究油藏烃类流体非均质性入手，分析了烃类的运移效应，充注期次、方向和顺序认为（１）凹陷内存在有两类来自同一烃源岩在不同热演化阶段排烃、聚集而形成的不同成熟度的原油；（２）两类原油具有不同的运移效应，是两期烃类充注作用的结果；（３）达尔其构造油藏中的烃类注入方向自北向南，其中白音断层上升盘达３、６井原油是早期流体运移的产物，而下降盘达１、２、３井等原油则是晚期烃类充注作用的结果．

Analysis of the Heterogeneity and the Injection History of the Hydrocarbon Fluids of the Oil Reservoir in Baiyinchagan Sag

Based on the study of the heterogeneity of hydrocarbon fluids in the reservoir,their migration effects and injection stages,direction and sequence are analysed.The analysis results show that,(1) there are two types of crude oil with different maturities in Baiyinchagan Sag ,which are from the same hydrocarbon source rock and were formed by hydrocarbon expulsion and accumulation in different thermal evolution stages.(2)these two types of crude oil have different migration effects.(3) the injection direction of hydrocarbon in Daerqi structural reservoir is from north to south.The crude oil from Da 3,6 wells in the upper wall of Baiyin fault is the result of early stage fluid migration,while the crude oil in Da 1,2,3 wells in the lower wall is the result of late hydrocarbon injection.