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为了探讨南黄海中—古生界油气保存条件,开展了上下扬子中—古生界构造演化、生储盖组合等对比分析。结果显示:印支和燕山运动对南黄海中—古生界的影响大大强于上扬子四川盆地,致使三叠系残留厚度较薄;推测南黄海中—古生界盖层以泥岩为主,膏盐岩为辅,其中泥岩盖层以下寒武统、下志留统和上二叠统为主,膏盐岩盖层则以中下三叠统为主。综合研究认为,烟台坳陷和崂山隆起以下寒武统或下志留统的泥岩为主要盖层,推测可形成威远型气藏;而青岛坳陷和勿南沙隆起以上二叠统泥岩为直接盖层,中下三叠统膏盐岩为间接盖层,推测可形成五百梯型或建南型气藏。南黄海盆地间接盖层缺乏,但下古生界具有良好的生烃潜力和保存条件,因此,南黄海盆地应重视下古生界页岩气的勘探和开发。
In order to discuss the conditions of the mid-southern Paleozoic oil and gas reservoirs in the South Yellow Sea, the contrastive analysis of the tectonic evolution of upper-lower Yangtze mid-Paleozoic tectonic evolution, and the combination of provenance and cover were carried out. The results show that the Indosinian and Yanshanian movements have a much stronger influence on the Mesozoic-Paleozoic in the southern Yellow Sea than in the upper Yangtze basin, resulting in a relatively small thickness of Triassic sediments. It is speculated that the Middle Yellow Sea Paleos- Gypsum salt rock, supplemented by the mudstone caprock below the Cambrian, the Lower Silurian and the Upper Permian-based gypsum rock cap rock is mainly in the Middle-Lower Triassic. The comprehensive study shows that the Lower Cambrian and Lower Silurian mudstones are the main cap rocks in Yantai and Laoshan uplifts, suggesting that Weiyuan gas reservoirs can be formed, whereas the overlying Permian mudstones in the Qingdao depression and the No-Nansha uplift are directly The caprock and the Middle-Lower Triassic gypsum salt rock are indirect cap rocks. It is presumed that five hundred ladder or Jiannan gas reservoirs can be formed. There is a lack of indirect caprock in the South Yellow Sea basin, but the Lower Paleozoic has good potential for hydrocarbon generation and preservation. Therefore, the exploration and development of Paleozoic shale gas in the South Yellow Sea Basin should be emphasized.