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沙二油层是欢喜岭油田主力油层之一,属湖河三角洲沉积体系,具南北两个物源方向,分别形成两个不同的砂岩体。按其构造性质可分两个二级构造带:即近邻凹陷中心的双台子滚动背斜构造带和单斜基础上的高升一西八千断裂鼻状构造带。油气聚集,前者主要受背斜构造控制,后者主要受断层控制。本文认为,依其油质的变化规律和油藏的分布位置,反映了断层具有封闭作用和通道作用的两重性。从而预示了在断层面向凹陷一侧找油,和发现稠油后在它的低台阶找优质油的规律。
The sand-two reservoir is one of the main reservoirs in Huanxiling Oilfield. It belongs to the depositional system of the Lake Delta, with two provenance directions, forming two different sandstone bodies. According to its tectonic characteristics, it can be divided into two secondary structural belts: the double-platform subtropical anticline in the center of the adjacent depression and the uplifting-west-eight-kilometer fracture nose zone on the basis of monoclinic foundation. Oil and gas accumulation, the former mainly controlled by the anticline, the latter mainly by the fault control. This paper argues that according to the variation law of oil quality and the location of oil reservoir, it reflects the duality of fault sealing and channeling. Thus predicting the law of looking for oil on the fault side of the depression and finding a good oil at its low level after finding heavy oil.