微体古生物学报

2025, v.42(02) 118-131

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东海盆地福州凹陷FZ-1井中生界孢粉生物地层及其古环境指示意义
MESOZOIC PALYNOSTRATIGRAPHIC CHARACTERISTICS OF WELL FZ-1 AND ITS SIGNIFICANCE IN THE PALEOENVIRONMENT OF THE FUZHOU SAG,EAST CHINA SEA BASIN

黄晓松,李宁,唐贤君,季兴开,谭思哲,徐振中
HUANG Xiaosong,LI Ning,TANG Xianjun,JI Xingkai,TAN Sizhe,XU Zhenzhong

摘要(Abstract):

为厘定东海盆地福州凹陷中生代地层,揭示其沉积和成烃背景,本文通过对该凹陷目前钻遇中生界最厚的FZ-1井进行系统的孢粉生物地层研究,识别孢粉组合,进行地层划分对比,并探讨古气候及环境指示意义。结果表明:FZ-1井自下而上可识别出2个孢粉组合,其中3370~3515m井段为桫椤孢Cyathidites-克拉梭粉Classopollis-克鲁克孢Klukisporites组合,时代为早-中侏罗世; 1 785~2 260 m井段为克拉梭粉Classopollis-隐孔粉Exesipollenites-希指蕨孢Schizaeoisporites组合,时代为晚白垩世。孢粉丰度、分异度及生态特征分子指示早-中侏罗世为半干旱、半潮湿的热带、亚热带气候;晚白垩世为干旱炎热的热带、亚热带气候。结合邻井岩石地层、沉积相和地球化学资料, 3 370~3 515 m井段中-下侏罗统是湖相环境,为中等-好烃源岩。上述结果表明,福州凹陷早-中侏罗世沉积时期具有较为有利的烃源岩层系发育背景,中生界勘探前景较好。
In order to determine the Mesozoic stratigraphic age and reveal the sedimentary and hydrocarbon formation background of the Fuzhou Sag, East China Sea Basin, the palynology of Well FZ-1, which contains the thickest sediment in the Mesozoic, was identified and analyzed. Identification of palynology assemblages, stratigraphic division and correlation, and the significance of paleoclimate and environment were discussed. The results show that two palynological assemblages presented in Well FZ-1. The lower assemblage, Cyathidite-Classopollis-Klukisporites,appearing at the depth of 3 370~3 515 m, suggests that the age be the Early-Middle Jurassic and the climate conditions be tropical and subtropical semi-arid and semi-humid. The upper assemblage, Classopollis-ExesipollenitesSchizaeoisporites, exhibiting at the depth of 1 785~2 260 m, suggested that the age be the Late Cretaceous and reflected arid tropical and subtropical climate conditions. After comparing with the data of spores, pollen, geochemistry, as well as the stratigraphy and sedimentary facies of the adjacent Well FZ-2, it is demonstrated that there existed a lake in the Fuzhou Sag during Early-Middle Jurassic with the high source rock potential. Our study shows that there was a favorable background for the development of source rock series in the Fuzhou Sag during Early and Middle Jurassic and the exploration prospect of the Mesozoic in East China Sea Basin is promising.

关键词(KeyWords): 孢粉;生物地层;古气候;成烃环境;中生界;福州凹陷;东海盆地
sporopollen;biostratigraphy;paleoclimate;hydrocarbon-generating environment;Mesozoic;Fuzhou Sag;East China Sea Basin

Abstract:

Keywords:

基金项目(Foundation): 中海石油(中国)有限公司综合科研项目(KJZH-2023-2103)资助~~

作者(Author): 黄晓松,李宁,唐贤君,季兴开,谭思哲,徐振中
HUANG Xiaosong,LI Ning,TANG Xianjun,JI Xingkai,TAN Sizhe,XU Zhenzhong

DOI: 10.16087/j.cnki.1000-0674.20250513.001

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