东海陆架西湖凹陷新生代沉积地层时代厘定

Age of Cenozoic Sedimentary Formations of the Xihu Sag,East China Sea Continental Shelf

西湖凹陷是东海陆架盆地的含油气地质构造,其主要的生油和储油层为新生代的古近纪及新近纪沉积地层。古近系包括宝石组、平湖组、花港组,新近系包括龙井组、玉泉组、柳浪组、三潭组。以往对花港组地层的沉积时代有不同观点,对新近系地层的时代研究则较少。本文从各地层孢粉组合所反映的古气候特征,结合有孔虫、超微化石以及区域资料,对新生代地层各组的时代归属进行探讨,从而为区域地层对比及海洋地质深化研究提供借鉴。

The Xihu sag is an oil and gas containing structure located in a basin on the East China Sea continental shelf. The main source bed and oil reservoir are the sedimentary formations of the Eogene and Neogene periods of the Neozoic era. The Eogene strata include the Baoshi, Pinghu, and Huagang formations, while the Neogene period strata include the Longjing, Yuquan, Liulang, and Santan formations. Different opinions exist regarding the sedimentary stages of the Huagang Formation, but there has been less study of the sedimentary stages associated with the Neogene strata. This paper uses the sporo-pollen complex recovered from the various sedimentary layers to reconstruct paleoclimatic conditions at the time of deposition, and together with the foraminiferal, nannofossi/, and other data, discusses the age of each of the Neogene formations, thereby providing a reference for the comparison and correlation of strata across the region, and an aid to future research in marine geology.