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中生代地层广泛分布于南黄海盆地及邻区 ,包括胶莱盆地、苏北盆地、群山盆地、黑山盆地、庆尚盆地等。陆上和海域的三叠纪地层主要由灰岩组成。侏罗纪地层目前只发现于陆上 ,主要由陆相碎屑岩组成 ,但从南黄海盆地某些地震剖面上可以看出 ,海域侏罗纪地层很可能存在。白垩纪地层在上述中生代盆地中分布最广 ,在许多钻井中 ,白垩纪地层的厚度在 1 0 0 0 m以上 ,甚至 2 0 0 0 m。其中 ,陆地上早白垩纪地层主要由暗色陆相碎屑岩组成 ,例如胶莱盆地的莱阳组、苏北盆地的葛村组 ,庆尚盆地的新洞群 ;而海域的早白垩纪地层通常由红色碎屑岩组成 ,例如 ,南黄海盆地东侧的 Kachi- 1和 Inga- 1井钻遇早白垩纪地层 ,其中 Kachi- 1井的早白垩纪地层为红褐色碎屑岩夹火山岩 ,而 Inga- 1井的早白垩纪地层为玄武岩。中白垩纪地层属氧化环境 ,岩石通常为红色或棕色。例如 ,胶莱盆地的王氏组、苏北盆地的浦口组和赤山组、庆尚盆地的河阳群。在南黄海盆地中 ,ZC7- 2 - 1、Kachi- 1和另外 5口井均钻遇这套以红色为主的地层。苏北盆地和南黄海盆地的晚白垩纪地层称为泰州组 ,主要由暗色泥岩组成 ,而庆尚盆地的晚白垩纪地层称为榆川群 ,主要由火山岩组成。地层对比显示 ,南黄海盆地及邻区中生代地层具有东部沉积厚、西部沉积?
The Mesozoic strata are widely distributed in the South Yellow Sea Basin and its adjacent areas, including the Jiaolai Basin, the Northern Jiangsu Basin, the Guanshan Basin, the Montenegro Basin, the Gyeongsang Basin and so on. The Triassic stratigraphy on land and in the sea consists mainly of limestone. At present, the Jurassic strata are only found on land and mainly consist of continental clastic rocks. However, it can be seen from some seismic profiles in the South Yellow Sea basin that the Jurassic strata in the sea are likely to exist. The Cretaceous strata are most widely distributed in the Mesozoic basins above, and in many drills, the Cretaceous strata have thicknesses of more than 10 000 and even 20 000 m. The terrestrial Cretaceous strata mainly consist of dark continental clastic rocks, such as Laiyang Formation in the Jiaolai Basin, Gecun Formation in the Subei Basin, and the new caves in the Gyeongsang Basin, while the Early Cretaceous strata in the sea area are usually For example, the Kachi- 1 and InGa- 1 wells on the eastern side of the South Yellow Sea Basin are drilled into the Early Cretaceous strata, of which the Early Cretaceous strata of the Kachi- 1 well are reddish-brown clastic rocks interbedded with volcanic rocks and The Early Cretaceous strata in Inga-1 well are basalts. The Cretaceous strata are oxidized and the rocks are usually red or brown. For example, the Wangli Group in the Jiaolai Basin, the Pukou Formation and the Chishan Formation in the Subei Basin, and the Heyang Group in the Gyeongsang Basin. In the South Yellow Sea Basin, ZC7-2-1, Kachi- 1 and the other five wells all encountered this red-dominated formation. The Late Cretaceous strata in the Northern Jiangsu Basin and the southern Yellow Sea Basin are called the Taizhou Formation and are mainly composed of dark mudstone. The Late Cretaceous strata in the Qing-Shang basin are called Yuchuan Group and are mainly composed of volcanic rocks. Stratigraphic correlation shows that the Mesozoic strata in the South Yellow Sea Basin and its adjacent areas have thick sediments in the east and sediments in the west.