淀南地区古近系沙河街组层序地层模式

应用层序地层学原理，通过地震剖面、电测曲线、岩石类型组合等层序地层界面划分标志，将淀南地区古近系沙河街组划分为6个三级层序、17个体系域。除层序Ⅰ缺少低位域外，层序Ⅱ至层序Ⅵ均由低位域、湖侵域和高位域三个体系域构成。在层序地层单元划分和对比的基础上，建立了断层坡折与沉积坡折两种层序地层模式，研究了与岩性油藏分布的关系，认为坡折带附近是岩性圈闭成藏极为有利的部位，坡折带下倾方向是低位扇、地层超覆等油藏发育的有利部位，坡折带上倾方向是地层不整合、滩坝透镜体等油藏发育的有利部位。

The Sequence Stratigraphy Model of Shahejie Formation in Diannan Area

With the application of the principles of sequence stratigraphy， Shahejie formation of Paleogene in Diannan Area is divided into six 3rd order sequences ，seventeen system tracts by the identification marks of sequence boundary including seismic section， well logging curves， litho combination and so on. Without lowstand systems tract in the sequence Ⅰ,the sequence Ⅱto sequence Ⅵ are all composed of lowstand systems tract, transgressive systems tract and highstand systems tract. Based on the division and correlation of the sequence stratigraphy units two sequence stratigraphic models with different genesis including the fault slope break and sedimentary slope break are established. The relations between the models and the distinction of lithologic hydrocarbon reservoir indicate that low stand fan and stratigraphic overlap hydrocarbon reservoirs are usually located below the slope break， and unconformity， beach dam lens reservoirs are usually located on the top of slope break.