东海盆地西湖凹陷花港组下段沉积相分析  

SEDIMENTARY FACIES OF THE LOWER HUAGANG FORMATION IN XIHU DEPRESSION OF DONGHAI BASIN

作　　者：蔡佳 祁鹏 宋双 

机构地区：[1]中海油研究总院,北京100028

出　　处：《海洋地质与第四纪地质》2017年第2期56-65,共10页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金资助项目"典型断陷富油气凹陷层序构成样式的差异性研究"(40872077);国家科技重大专项"近海富烃凹陷资源潜力再评价和新区;新领域勘探方向"(2011ZX05023-001);"近海大中型油气田形成条件与分布"(2011ZX05023-006)

摘　　要：西湖凹陷是东海盆地最具勘探潜力的地区,渐新统花港组为一套厚度巨大的湖相砂泥岩地层,是最重要的储层,可以分为两段。综合应用测井、岩心、地震剖面、古生物等资料并与陆上相关盆地进行对比,在西湖凹陷花港组下段共识别出3种主要的沉积体系:湖泊、三角洲、河流。西湖凹陷在花港组时期是中国东部一个大型的坳陷型湖盆,在古地形、古气候、湖平面、古水深、古物源5个地质因素的共同作用下形成大型浅水三角洲,以三角洲前缘的水下分流河道复合体为特征,物源供应充足,汇聚成沿中央反转构造带推进的轴向物源。坳陷湖盆大面积三角洲相的发育形成了西湖凹陷大面积展布的优质储层,中央反转构造带中北段是今后勘探的主攻方向和储量接替区。The Xihu Depression is the most important potential oil and gas exploration areas in the Donghai Basin.The Huagang Formation,as the major reservoir rock comprised of lacustrine sandstone and mudstone,is very thick.The Formation could be further divided into 2members.Based on the data of logs,cores,seismic profiles and paleontology,and compared with the basins on mainland,careful studies are devoted to the sedimentary system and sedimentary facies of the Huagang Formation in the Xihu Depression.There are three kinds of depositional systems,i.e.lacustrine,deltaic and fluvial systems.And the Xihu Depression was a large lake during the Huagang stage.Shallow water delta was formed under the control of paleotopography,paleoclimate,lake level,water depth and paleo-provenance,and characterized by underwater distributary channel complex in the delta front.Sediments are provided by the provenance along the central overturned structure zone.The large delta in the lake basin formed the high-quality reservoir in the Xihu Depression.The middle and north parts of the central overturned structure zone is supposed the main exploration target in the future.

关 键 词：花港组 物源体系 坳陷湖盆 西湖凹陷 东海盆地 

分 类 号：P736.2[天文地球—海洋地质]