塔里木盆地哈得逊油田东河砂岩油藏原油特征和倾斜油-水界面成因初探

塔里木盆地哈得逊油田东河砂岩油藏内部存在着由北向南原油密度等物性呈现规律变化的特征.西北部的"重质油"（密度>0.34 g/cm³）与中-南部的"轻质油"（密度<0.34g/cm³）来源于同一套烃源岩,但原油族组成、原油成份等方面的特征存在着较大的差别.东河砂岩油藏的原油可能不是直接来自于烃源岩,而是来源于古油藏,原油物性的差异是晚喜马拉雅运动导致晚海西期形成的古油藏发生调整并在运移过程中造成的成份分异等原因所致.哈得逊鼻隆构造高点至今仍在迁移,东河砂岩油藏正处于充注、调整之中,导致了其油-气-水界面的大幅度倾斜.

A primary discussion on petrophysical character and genesis of inclined oil-water contact of Donghe sandstone reservoir in the Hadson 0ilfield,Tarim Basin

The Donghe sandstone reservoir in the Hadson Oilfield,Tarim Basin tended to decrease from the northwest to the southeast in petrophysical properties such as oil density.Originating in the same suite of source rocks,the heavy oil(density greater than 0.934 g/cm³)in the northwest and the light oil(density less than 0.934 g/cm³)in the southeast varied obviously in physical properties of crude oil,petroleum components and composition.They were not originated from the matured marine source rocks directly but might from the ancient oil reservoir.The products of composition differentiated in the process of ancient oil reservoir adjustment and hydrocarbon migration owing to tectonic activity during the late Himalayan stage.Continuous southward migration of structural high of the Hadson Nose Uplift resulted in the hydrocarbon remigration in ancient reservoirs and consequent generation of new oil reservoirs with inclined oil-water contact which are still undergoing hydrocarbon charge.