4 . it is concluded that the es3 is a main member to accommodate the oil expelled from the source rock of the es3 member , that two assignment units of the type i are prospective areas where faulted reservoirs , fracture reservoirs , lithologic deposits may well be founded . the depth of threshold is among 2600 - 2800 meter and that of expulsion is around 3100 - 3400 meter , so the source rock of sha er member is totally immature and that of sha san member is partly mature 4 、从历史演化角度和二次运移理论出发，研究了德南洼陷下第三系低熟油灶的油气运移作用和分配，提出初次分配主要指向是沙三下段；内部成藏系统是有效的成藏系统，其内部油气的再次分配主要指向德3井南和德1井南是两个类油气分配单元；德南洼陷生烃深度2600 - 2800米间，排烃起始深度在3100 - 3400米间，按目前下第三系地层埋深深度，则沙一段生油岩基本上处于未成熟状态，沙三中、下生油岩处于低熟状态，仅在洼陷深部分布成熟生油岩。
