辽河滩海东部地区层序结构及发育模式

The Sequence Structure and Its Development Mode in the East of Liaohe Beach Area

根据岩性、测井、古生物等层序识别标志，将辽河滩海东部地区古近系划分为9个三级层序（SQ1-SQ9），建立了全区统一的层序地层格架。SQ1～SQ9层序发育具有东西分区、南北分带、纵向叠置的特点。东西分区特征主要表现为：盆地西侧SQ3～SQ9各层序逐层超覆于中央凸起带之上，低水位体系域不发育；盆地中部洼陷带SQ1～SQ9各层序沉积物变细，分布稳定；盆地。东侧SQ3～SQ9各层序逐层超覆于东部斜坡之上，削截、上超等现象明显。南北分带的特征表现为：在盖州滩断鼻带、太葵断裂背斜带、龙王庙断裂背斜带内沉积物整体呈南粗北细特征。

According to the sequence stratigraphic markers of lithology,logging and paleontology of Paleogene System in the east of Liaohe Beach Area was divided into 9third-order sequences and unified sequence stratigraphic framework was established in the whole area.The sequence of SQ1~SQ9had the characteristics of partition in EW,zoning in SN and vertical superposition.The partition in EW presented that each sequence in SQ3~SQ9in the west side of basin was overlapped on the central hump without development of low water system domain,in each sequence of SQ1~SQ9in the central depression belt,the deposit became diminution with stable distribution.Each sequence of SQ3~SQ9in the east of the basin was overlapped on the east slope with obvious truncation and onlap.The difference between the north and south presents that the deposits in Gaizhoutan fault-nose zone,Taikui fault anticlinal zone and Longwangmiao fault anticlinal zone are totally coarse in the south and diminution in the north.