浅析辽河油田西部凹陷沙三段沉积相及演化分析

Analysis on sedimentary facies and evolution of Sha-3 Formation in western Liaohe Oilfield

辽河油田西部凹陷沙河街组是重要的深层储层,具有分布范围广、三段沉积厚度大等特点。沙三段沉积期所属环境为较深水还原湖泊环境,气候暖湿;沉积砂体属水进型扇三角洲沉积类型。砂体发育受西侧物源的影响较深,主要发育了若干扇三角洲砂体,其直接与烃源岩接触,邻近生油洼陷,利于油气富集。

The Shahejie Formation in the western sag of Liaohe Oilfield is an important deep reservoir featuring wide distributionand large deposition thickness.The sedimentary environment of Sha-3Formation is deep water reducing lake,where the climate iswarm and humid;sedimentary sand body belongs to water flood type fan delta deposition type.The sand body development is deeplyinfluenced by the western source,and several fan delta sand bodies are developed,which contact directly with the source rocks andadjacent to the oil-bearing sags,which is favorable for hydrocarbon accumulation.