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本文应用沉积物的古生态、粒度、岩性、电性、沉积构造等标志,将辽河裂谷盆地西部凹陷下第三系沙河街组三段的砂砾岩沉积定为浊积岩相,并描述了主要砂体的几何形态。根据浊积岩从滑坡到流动过程中岩性、电性、沉积构造、垂向层序的变化,粗略地把浊积岩分为滑坡相、近源浊流相和远端浊流相等三个相带,并根据各相带的分布特点指出,浊积岩相的石油勘探不应局限于盆地边部,而应向盆地中部发展。
In this paper, we use the signs of paleo-ecology, grain size, lithology, electrical property and sedimentary structure of sediments to define the conglomerate deposition of the third member of Shahejie Formation in the western depression of Liaohe Rift Basin as turbidite and describe The main sand body geometry. According to the change of lithology, electrical property, sedimentary structure and vertical sequence of turbidite from landslide to flow, the turbidite is roughly divided into three phases: landslide phase, near-source turbidity phase and far-end turbidity flow Based on the distribution characteristics of each phase belt, it is pointed out that the oil exploration of turbidite facies should not be confined to the edge of the basin but should be developed to the central part of the basin.