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松辽盆地英台—大安地区西邻龙虎泡—大安阶地。姚家组下部沉积时期,英台大安地区西部紧邻东倾的斜坡,在地震剖面上与姚家组下部地层相当的2个反射同相轴向西超覆尖灭,反映了姚家组下部为2套向西逐层超覆的楔形体。测井、录井、岩心资料综合分析表明,下部楔形体主要为重力流沉积形成的湖底扇,上部楔形体在沉积上东、西存在差异,西侧为三角洲,东侧以湖底扇沉积为主。湖底扇主要为滑塌沉积和碎屑流沉积,少见浊流沉积。
Songliao Basin Yingtai - Daan area west of the Dragon and Tiger Soaked - Daian terrace. The Lower Member of Yaojia Formation deposited in the lower part of Yaojia Formation shows that the two reflection facies corresponded to the lower part of the Lower Yaojia Formation in the seismic section are westward overturned, Set of westerlies overlying the west layer by layer. Comprehensive analysis of logging data, well logging data and core data shows that the lower wedge is mainly a sublacustrine fan formed by gravity flow deposition. The upper wedge has differences in east and west sediments, with a delta in the west and a sublacustrine fan in the east . The sublacustrine fan is mainly slump deposition and debris flow deposition, rare turbidity flow deposition.