东海盆地西湖凹陷基底时空演化特征再认识及勘探意义  

Reunderstanding of temporal and spatial evolution characteristics of the basement of Xihu Depression in East China Sea Basin and its exploration significance

作　　者：黄晓松 唐贤君 许怀智 何新建 陈永军 HUANG Xiaosong;TANG Xianjun;XU Huaizhi;HE Xinjian;CHENYongjun(Shanghai Branch Company of CNOOC(China)Ltd.Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《上海国土资源》2024年第2期125-131,共7页Shanghai Land & Resources

基　　金：“十四五”国家重大科技专项。

摘　　要：东海盆地西湖凹陷中西部多口钻井钻遇较厚层基底火山岩,展现了潜山勘探的巨大潜力。但长期以来基底火山岩发育期次不明晰,基底形成时代及地层序列不明确,制约着西湖凹陷早期构造演化与潜山储层的勘探潜力分析。本次通过岩石学、地球化学、构造地质学、地球物理学等多学科手段对东海盆地西湖凹陷中西部基岩开展综合研究及评价,厘定西湖凹陷基底形成时代、岩石类型及地层序列,总结基底时空演化特征新认识。基底时空演化特征的再认识,有利于厘清西湖凹陷早期构造演化阶段划分和潜山岩性分布规律,指明西湖凹陷基底潜山储层的有利分布区,为西湖凹陷潜山勘探提供方向。In the middle and western part of Xihu Depression,East China Sea Basin,many wells have encountered thick basement volcanic rocks,it shows the great potential of buried hill exploration.But for a long time,the development stage of basement volcanic rocks is not clear,the basement formation age and stratigraphic sequence are not clear,which restricts the early structural evolution of Xihu Depression and the exploration potential analysis of buried-hill reservoir.This time,by means of petrology,geochemistry,structural geology,geophysics and other multidisciplinary methods,a comprehensive study and evaluation of the bedrock in the central and western part of Xihu Depression in the East China Sea Basin is carried out to determine the formation age,rock types and stratigraphic sequences of the basement of the Xihu Depression,summarize the new understanding of temporal and spatial evolution characteristics of basement.New understanding of temporal and spatial evolution of basement,which is helpful to clarify the division of the early tectonic evolution stages of the Xihu Depression and the lithology distribution of the buried hills in the basin.It indicates the favorable distribution area of basement buried hill reservoir of Xihu Depression,provides the direction for the exploration of buried hill in Xihu Depression.

关 键 词：西湖凹陷 地层时代 岩石学 地层序列 构造演化 

分 类 号：P588.1[天文地球—岩石学]