桩海地区油气成藏系统分析

Analysis of oil-gas reservoir -forming system in Zhuanghai area

桩海地区第三系可划分为四个层序,含油层系主要分布在层序Ⅲ、Ⅳ界面及层序Ⅰ界面上下。受区内生油凹陷及断层控制,油藏类型分布具有分割性:西部油藏主要受岩性及地层控制,东部则以构造及地层油藏为主。自西向东,含油层系逐渐增多,含油层位由浅变深,原油性质也呈规律性变化。气藏的分布受油源条件和饱和压力控制,明化镇组、馆陶组不会形成大规模气藏。

The Eogene in Zhuanghai area is divided into four sequences. The main oil-bearing series of strata distribute near the boundaries of sequenceⅢ , sequence Ⅳand sequence I . Influenced by oil-generating sag and fault in the areas, the types of oil reservoir is mainly controlled by lithologic and formation in west, structure and formation reservoir are taken as the dominant factor in east. Oil-bearing series of strata generally increases, oil-bearing horizon turns deeper and oil quality varies by rule from west to east. The distribution of gas reservoir is controlled by oil-source condition and saturation pressure, so large-scale gas reservoirs can't be formed in Nm and Ng.