The Lower Paleozoic source rock in the region has undergone two oil generation processes,the first one has taken place in basin subsidence before Caledonian movement.

• 区内下古生界烃源岩经历了两次成油过程,第一次在加里东运动前的盆地沉降阶段,第二次在加里东运动后晚古生代陆表海沉积阶段。