The basins in the eastern part of North China are the typical multi_cycle composite basins,where the hydrocarbon_generation and reservoir_seal combination conditions exist commonly in the middle_upper Proterozoic,Paleozoic,Mesozoic and Cenozoic.

• 华北东部盆地是典型的多旋回叠加改造型盆地 ,中上元古界、下古生界、上古生界、中生界和新生界普遍具有生烃潜力和储盖组合条件。