三水盆地白垩系的划分与对比

ON THE SUBDIVISION AND CORRELATION OF THE CRETACEOUS SYSTEM OF SANSHUI BASIN OF GUANGDONG

张显球

Zhang Xianqiu

地质矿产部第十二石油普查大队

The 12th Petroleum Prospecting and Exploration Brigade, Ministry of Geology and Minerals

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。

Subdivision and correlation of the Cretaceous system of Sanshui basin are made through paleontological study on over 60 wells. The lower Cretaceous is called the Baihe formation. This formation is determined as of late Early Cretaceous (Aptian-Albian) according to the research on fossils of the plants, sporo-pollen and Charophyta. The upper Cretaceous can be divided into Sanshui formation and Dalang-shan formation. The fossil therein can be correlated with the typical sections (the Nanxiong formation and the Pingling member of Shanghu formation) of the upper Cretaceous in China. The Sanshui formation are comparable with the middle and lower parts of the Nanxiong formation. Their age is determined to be the early-middle stage of Late Cretaceous, whereas the Dalangshan formasion is comparable with the upper part of the Nanxiong formation and the lower part of the Shanghu formation, their age being considered to be the late stage of Late Cretaceous.

https://doi.org/10.11781/sysydz198401032