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辽河西部凹陷是箕状凹陷,是基岩块休在张应力作用下,沿着正断层面不断拉开、滑落而形成的。早第三纪沉积凹陷的范围随着不断扩大。基岩断块沿弧形断面滑落,发生翘倾运动过程。在西部缓坡带有几排受反向正断层控制的翘倾断块,呈垒堑相间。沙三生油岩超复在翘倾断块之上。缓坡上沙四段发育了三角洲和湖湾相碳酸盐岩等多种沉积层系,形成了多种多样的隐蔽圈闭:披复断块圈闭、稠油遮挡地层圈闭和粒屑灰岩岩性圈闭等等。 翘倾断块按基岩构造形态可分为三部分,即断面,断洼和断坡。受断块构造所控制,披复断块圈闭形成于上复沉积岩层的相应构造之中。 稠油遮挡地层油藏。沙四段三角洲砂岩体在上倾方向剥蚀暴露,原油运移至地表逸散,因氧化形成稠油,在不整合面下遮挡而成圈闭。
The western Liaohe depression is a graben-like depression, which is formed when the bedrocks are under the action of tensile stress and are continuously opened and slipped along the normal fault plane. Early Tertiary sedimentary depression with the expanding range. Bedrock fault block along the curved section of the slide, tilting movement occurred. In the western gentle slope with a few rows by the reverse normal fault control tilting block, was grabbing interphase. Shasan oil rock superfluous in the tilt-up block above. Various sedimentary layers such as deltaic and lacustrine facies carbonate rocks are developed in the fourth member of the Upper Slope of the gentle slope, forming a variety of subtle traps: Phong fault block traps, heavy oil trap strata trap and gravel dust Rock lithology traps and more. The tilt-break block can be divided into three sections according to the rock structure structure, namely, the section, the depression and the slope. Controlled by the fault block structure, the Phi fault block trap is formed in the corresponding structure of the upper complex rock. Heavy oil obstructs formation reservoirs. The sandstone bodies of Es4 in the Sha 4 Member are denuded and exposed in the updip direction. Crude oil migrates to the surface to escape from the earth surface. Due to the formation of heavy oil by oxidation, it is trapped under the unconformity and becomes trapped.