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永安构造位于苏北盆地高邮凹陷汉留断层西侧,资源潜力大。近年来,该区相继发现多个含油气区块,已成为高邮凹陷隐蔽油气藏的重要战场。本次研究以井资料为基础,重点对沉积微相标志中岩性相标志和沉积构造标志进行研究。研究表明永安地区戴一段层理构造为水平层理、透镜状层理、块状层理、韵律层理、包卷层理五种类型。沉积微相分布特征表明水下分流河道微相是砂体优势发育区带,其中E_2d_1~(2中)和E_2d_1~(2上)砂组单砂体发育较厚。
Yongan structure is located in the northern part of the Hanliu Fault in the Gaoyou Sag, Northern Jiangsu Basin, with great potential for resources. In recent years, several oil-bearing blocks have been discovered in this area, which has become an important battlefield of subtle reservoirs in the Gaoyou sag. Based on the well data, this study focuses on lithologic facies signs and sedimentary structures in sedimentary microfacies markers. The research shows that the first layer of bedding structure in Yongan area is composed of horizontal layering, lenticular layering, massive layering, rhythm layering and wrapping layering. The distribution characteristics of sedimentary microfacies indicate that the underwater distributary channel microfacies is the sandstone dominant zone, in which the single sand body of E_2d_1 ~ (middle two) and E_2d_1 ~ (2) sand groups developed thickly.