胜坨油田胜一区沙二段上部高分辨率层序结构分析和叠加样式研究

胜一区位于渤海湾盆地济阳坳陷胜坨油田的西部，沙二段上部油层主要属低弯度辫状河三角洲平原亚相沉积。基于基准面旋回理论的高分辨率层序地层学理论，把胜一区沙二段上部1～3砂层组划分为一个中期旋回层序，5个短期和14～16个超短期旋回层序。在层序格架的控制下，建立了超短期、短期和中期旋回层序结构的叠加样式；按岩性、岩相组合特征及沉积演化序列，超短期旋回层序、短期旋回层序分为向上“变深”非对称型和对称型2种基本结构类型；中期旋回层序结构为以上升半旋回为主的不完全对称型。

High-resolution sequence structural and stacking pattern study of the Es2 reservoirs in the Sheng-1 area, Shengli Oil Field

Sheng 1 area is located in the western part of the Shengtuo Oilfield of the Jiyang Depression in the Bohai Bay Basin. The oil bearing upper part of the Member 2 (Es 2 ) of the Shahejie Formation was deposited in delta plain low tortuous braided channels. The sand beds 1 to 3 of the Es 2 can be divided into 1 intermediate, 5 high, and 14 16 super high order depositional cycles, each with different internal structures and stacking patterns. The high and super high order cycles demonstrate two types of sequence structures: symmetry and asymmetry stacking patterns and deepening upwards cycles. The two intermediate cycles asymmetric ascending half cycles.