渤海湾盆地济阳坳陷渤南洼陷的主要含油层系为古近系的沙河街组。沙河街期各时段沉积相的展布各具特征 ,并具清晰的演化序列。沙四早期以发育扇三角洲相为特征 ,分布于洼陷南部 ;北部边缘则发育近岸水下扇沉积 ;东部及西部均存在辫状河三角洲相 ;中部有盐湖沉积。沙四晚期以盐湖相发育为特征 ,主要占据湖泊深水部位 ,其周围依次分布半深湖、浅湖及滨湖亚相。此外 ,局部见及小型辫状河三角洲沉积。沙三期是辫状河三角洲发育的全盛时期 ,主要分布于洼陷东南部 ,物源来自孤岛凸起。这些沉积长期以来被认为是浊积岩 ,近期研究表明它们属辫状河三角洲沉积。辫状河三角洲前缘砂体构成了渤南洼陷最主要的储层成因类型 ,渤南洼陷绝大部分油气均储存在该类砂体中。沙三期湖泊相沉积也始终发育 ,且深湖、半深湖亚相发育良好。经过沙三期后的抬升剥蚀和填平补齐作用 ,沙二期湖盆变浅 ,以浅湖为主 ,研究区东南部及西北部均发育面积较大的辫状河三角洲沉积。沙一期发生大规模湖侵 ,物源区向后退缩 ,研究区仅存在单一的湖泊相 ,其中半深湖、深湖亚相占绝对优势 The main oil-bearing formation in the Bonan Sag of the Jiyang Depression in the Bohai Bay Basin is the Shahejie Formation of Paleogene. The distribution of sedimentary facies at each period of the Shahejie period has its own characteristics and has a clear sequence of evolution. In the early period of the Fourth Member, the fan delta facies were characterized and distributed in the southern part of the sag. The northern margins developed the nearshore subaqueous fan deposits, while the braided river delta facies existed in the east and the west and salt lake sediments in the middle. The late Es4 was characterized by the development of salt lacustrine facies, which mainly occupied the deepwater lake. Around the semi-deep lakes, shallow lakes and lakefront sub-facies were distributed in sequence. In addition, local see and small braided river delta deposition. Triassic period is the heyday of braided delta. It is mainly distributed in the southeast of the depression, with the source of the material coming from the island. These deposits have long been considered turbidites, and recent studies have shown that they are deposited in braided river delta. Braided river delta front sand bodies constitute the most important reservoir type in the Bonan Sag, and most of the hydrocarbons in the Bonan Sag are stored in these sand bodies. Sediment lacustrine facies also always developed, and the deep lake, semi-deep lake subfamily well-developed. After uplifting, denudation and fill-up effect after the third Eocene, the lacustrine basin in the second stage became shallower and the shallow lakes mainly dominated. The braided river delta sediments with large developed area in the southeastern and northwestern areas of the study area were deposited. Large-scale lake invasion occurred in the first phase of the Shahejiedu area, and the provenance area retreated backwards. Only a single lacustrine phase existed in the study area, of which the semi-deep lake and deep-lake sub-phase occupied the absolute dominant position