双河油田核三段Ⅶ油组下层系层序地层划分

Sequence Stratigraphic Classification of Lower Series at H3 Member Ⅶ Oil Formation in Shuanghe Oilfield

以高分辨率层序地层学原理为指导,利用岩心、测井、海平面变化及构造演化等资料,以最大湖(洪)泛面为层序界面,对泌阳凹陷双河油田核三段Ⅶ油组不同级次基准面旋回进行精细划分。通过构造演化和古气候特征分析,建立Ⅶ油组小层划分方案和层序对比骨架剖面。在此基础上,将Ⅶ油组下层系划分为5个短期旋回和15个超短期旋回,二者均为向上"变浅"的非对称型旋回。

In this paper, guided by high-resolution sequence stratigraphy principles, combined with previous research, used data of core, log, sea-level change and tectonic evolution, various grades of base-level cycles of H3 member Ⅶ Oil formation are divided precisely in Shuanghe oilfield Biyang Sag of which the sequence boundary is maximum lake flooding plane. Through the study of tectonic evolution and paleoclimate characteristics, thin layer division scheme of Ⅶ oil formation and sequence correlation skeleton profile are established. On this basis, lower series of Ⅶ oil formation is divided into five short-cycles and 15 ultra-short-cycles. And they are both shoaling-upward asymmetric cycles.