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三水盆地东南和西北两个地区是白垩纪沉积区。东南区有40多口井钻遇白垩系,发育较全,厚达3000多米;西北区有9口井钻遇白垩系,在石角一带地表出露良好,此区未见下统,上统很发育,厚达1000多米,不整合于晚古生界之上;两区之间为中央隆起区缺失白垩系。 白垩系的层序是根据钻井资料建立的,自下而上划分为下白垩统白鹤洞组、上白垩统三水组和大塱山组。
The Sanshui Basin southeast and northwest two areas are Cretaceous sedimentary area. More than 40 wells drilled in the southeast area encountered the Cretaceous, which developed more than 3000 meters thick. Nine wells in the northwestern region encountered Cretaceous and exposed well in the surface area of Shijiao. Very developed, more than 1,000 meters thick, not integrated in the late Paleozoic above; missing between the two areas for the central uplift Cretaceous. The sequence of the Cretaceous is based on drilling data and is divided into Lower Cretaceous Baihadong Formation, Upper Cretaceous Sanshui Formation and Dadushan Formation from bottom to top.