高邮凹陷戴南组断层—岩性油藏成藏体系及主控因素研究

Accumulation system and controlling factors of fault-lithologic reservoirs of Dainan Formation in Gaoyou Sag,Northern Jiangsu Basin

基于控藏断层封闭性能演化、油藏含油层位和戴南组"五高导"泥岩段生烃能力的差异,高邮凹陷戴南组断层—岩性油藏成藏体系可分为3种类型,依次为自源型、它源型和混源型油气成藏体系。自源型成藏体系主要分布在邵伯、樊川次凹深处,典型油藏为邵深1油藏;它源型油藏主要分布在马家嘴、周22和邵18等油藏区域;混源型油藏以联3、联7和永22等油藏为代表。高邮凹陷戴南组断层—岩性圈闭成藏主要受油源和运移通道控制,即"二元主控"。在成藏体系分布和主控因素分析的基础上,提出黄珏—马家嘴、联盟庄—永安和曹庄—肖刘庄地区是高邮凹陷戴南组断层—岩性油藏分布的最有利区带。

Based on the studies of fault sealing evolution, oil-bearing formation and hydrocarbon generation ability of highly-conductive mudstones in the Dainan Formation, the fauh-lithologic reservoir systems of the Dainan Formation in the Gaoyou Sag have been classified into 3 types, including self-sourced, other-sourced and mixed-sourced. The self-sourced accumulation systems mainly locate in the deep Shaobo and Fanchuan Sags, and the Shaoshenl resrvoir is typical. The other-sourced accumulation systems mainly distribute in the Majiazui, Zhou22 and Shaol8 reservoirs. The mixed-sourced accumulation systems are represented by the Lian3, Lian7 and Yong22 reser- voirs. The fault-lithologic reservoirs of the Dainan Formation in the Gaoyou Sag are controlled by2 elements, oil source and migration pathway. The favorable zones for exploration include Huangjue-Majiazui, Lianmengzhuang- Yongan and Caozhuang-Xiaoliuzhuang.