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松辽盆地北部东区葡萄花油层沉积时期,基底整体一致下降,气候干旱,地形平缓,河流入湖发育浅水三角洲。三角洲平原上的分流河道通过填积和湖面的频繁波动向湖泊中心方向长距离推进,在三角洲前缘的浅水区发育很有特色的水下分流河道,发育了宽展的三角洲前缘相沉积。在平面上,三角洲平原与宽展的三角洲前缘、前三角洲平缓相接,不存在Gilbert型三角洲模式的顶积层、前积层、底积层三褶结构。
During the deposition of Putaohua oil layer in the eastern part of the northern Songliao Basin, the whole basement decreased uniformly with arid climate and gentle terrain. The rivers flow into the lake to develop shallow water delta. The distributary channels on the delta plain advance long distances to the center of the lake through frequent filling and fluctuations of the lake surface. In the shallow delta of the delta front, there are distinctive underwater distributary channels and wide-spread delta front facies deposits are developed. On the plane, delta plain and flat delta front and front delta smoothly connect with each other. There is no top layer, pre-layer or bottom layer tri-fold structure in Gilbert delta mode.