江苏下扬子区的海相中—古生界构造演化经历了前扬子板块、稳定地台和西太平洋活动陆缘等三大阶段。
Marine Meso-Paleozoic structures in the region have undergone three evolution stages of Pre-Yangzi Plate, stable platform and West Pacific active continental margin.
区内下古生界烃源岩经历了两次成油过程，第一次发生在加里东运动前的盆地沉降阶段，第二次发生在加里东运动后晚古生代陆表海沉积阶段。
The first was in the basin subsidence stage that was prior to the Caledonian movement. The second took place in the marginal sea deposition stage after the Caledonian movement.
华北地区下古生界烃源岩研究对前古近系油气战略资源选区具有重要意义。
Study on the hydrocarbon source rocks of Lower- Palaeozoic in North China is very important to the Pre- Tertiary oil-gas strategic precinct.
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