珠江口盆地新生代地层问题讨论及综合柱状剖面图编制

INVESTIGATION TO THE STRATIGRAPHY AND CONSTRUCTION OF THE COMPREHENSIVE GEOLOGIC COLUMNAR SECTION OF CENOZOIC FORMATION IN PEARL RIVER MOUTH BASIN

以大量钻井资料为依据，对珠江口盆地存在的地层问题进行了讨论，认为：（1）上中新统／中中新统界线附近没有缺失有孔虫和超微化石带，而是本区二级层序中主要最大海泛面附近密集层的所在位置；（2）上／下第三系界线置于浮游有孔虫N4带的底较为合适，南海东部公司目前所定义的珠海组的时代应归于早中新世；（3）恩平组的时代属于渐新世；（4）晚始新世地层在本区可能缺失，神狐组与文昌组孢粉组合时代同属中始新世，陆丰组为早始新世地层，据此，编制了珠江口盆地新生界综合柱状剖面图。

Several stratigraphic problems have been discussed based on abundant drilling data in the Pearl River Mouth Basin.The main results are:1.There exist bio zones near the boundary between Upper and Middle Miocene.Both forams and nannofossils may be observed within the condensed section when the sample space is small enough.2.The boundary between the Neogene/Palaeogene Formation is located at the bottom of the N4 zone containing forams.The age of Zhuhai Formation defined by Nanhai East Corporation is Early Miocene.3.The age of the Enping Formation is Olingocene.4.The Upper Eocene maybe does not exist in this region.Shenhu and Wenchang Formations have the same sporo pollen assemblages of Middle Eocene. Lufeng Formafion is possibly Lower Eocene.A comprehensive columnar section for Cenozoic formation in the Pearl River Mouth Basin is accordingly constructed.