长堤地区油气成藏系统及成藏模式

根据长堤地区油气来源和运移聚集特征,将该区的油气成藏系统划分为中西部成藏系统与东部成藏系统。中西部成藏系统油气来源于五号桩洼陷,以断层、砂岩输导层为主要运移通道,以垂向运移为主,油气成藏类型比较丰富。东部成藏系统主要以不整合面和与之相通的砂岩输导层为油气运移通道,以横向运移为主,可在沙三段湖相砂岩及东营组下段的水下河道砂体所构成的岩性、地层圈闭中聚集成藏。

Oil - gas reservoir forming system and pattern in Changdi area

According to the source,migration and accumulation characters of oil and gas in Changdi area,the oil-gas reservoir forming system may be divided into two clas-ses of middle-west part and east part.In the middle-west reservoir-forming system,oil and gas was from the Wuhaozhuang Subsag,the main migration pathway was fault and sandstone translocation layers,the direc-tion was mainly vertical,the types of reservoir-forming were plentiful.In the east reservoir-forming system, the migration pathway was mainly unconformable sur-face and its connecting sandstone translocation layers, the direction was mainly lateral,and reservoir may be accumulated and formed in the lithologic and strati-graphic traps structured by lake sandstones in Es3 and submarine channel sandbody in the lower Ed.