珠江口盆地北部早—中中新世滨线迁移轨迹与沉积体系演化  

Shoreline trajectory and depositional evolution of Early-Mid Miocene succession in Northern Pearl River Mouth Basin

作　　者：张昕[1] 林畅松[2] 张忠涛 冯轩 张博 舒梁峰 姜静 ZHANG Xin;LIN Changsong;ZHANG Zhongtao;FENG Xuan;ZHANG Bo;SHU Liangfeng;JIANG Jing(School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;School of Ocean Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;Research Institute of Shenzhen Branch,CNOOC,Shenzhen,Guangdong 518000,China;China Ocean Mineral Resources R&D Association,Beijing 100860,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国地质大学(北京)海洋学院,北京100083 [3]中海油深圳分公司研究院,广东深圳518000 [4]中国大洋矿产资源研究开发协会,北京100860

出　　处：《东北石油大学学报》2020年第1期99-111,I0007,共14页Journal of Northeast Petroleum University

基　　金：国家自然科学基金项目(91328201);国家自然科学基金项目(91528301)。

摘　　要：根据三维地震和钻测井资料,研究珠江口盆地北部珠江组—韩江组层序划分及沉积演化特征,明确珠江口盆地北部早—中中新世沉积体系演化与海平面变化的关系;通过识别不同类型的前积倾斜层特征,分析早—中中新世滨线迁移趋势,建立滨线迁移轨迹与层序旋回及海平面变化的对应关系。结果表明:珠江口盆地北部陆架区早—中中新世珠江组—韩江组划分为2个二级层序(CS1和CS2)和8个三级层序(S1-S8),研究区识别5种前积倾斜层,并划分为上升海侵型、下降海退型和下降海侵型3种滨线迁移轨迹类型。珠江组沉积早期,陆架边缘三角洲体系自陆架边缘向陆地退积,逐渐演化为内陆架三角洲而形成上升海侵型滨线迁移轨迹;珠江组沉积晚期—韩江组沉积早期,三角洲体系开始向盆地方向推进,逐渐演化为外陆架三角洲体系,滨线迁移轨迹呈下降海退型;韩江组沉积晚期,三角洲体系再次后退至内陆架区而形成下降海侵型滨线迁移轨迹。研究区滨线迁移轨迹与区域性海平面变化具有良好的对应关系。该结果对研究区油气勘探具有指导意义。In order to investigate the relationship between the evolution of depositional system and sea level changes,on the basis of 3D seismic and well data,the sequence stratigraphy and depositional history of Zhujiang and Hanjiang Formation in northern Pearl River Mouth Basin is analyzed.The correlation among shoreline trajectory,depositional cycles and sea level changes is also discussed according to the analysis of clinoforms and shoreline migration.The results show that the Early-Mid Mioecene successions in the northern shelf of Pearl River Mouth Basin has been divided into 2 second-order sequences(CS1 and CS2)and 8 third-order sequences(S1-S8),associated with 5 types of clinoforms.The shoreline trajectory can be subdivided into the descriptive categories of ascending transgressive,descending regressive and descending transgressive.The early depositional time of Zhujiang Formation is dominated by a transgressive shoreline trajectory,with delta system transited from shelf-edge to inner shelf.Afterwards,delta system prograded seawards to the outer shelf and regressive shoreline trajectory formed.During the late depositional time of Hanjiang Formation,deltaic system retrograded to the inner shelf again,associated with a second transgressive shoreline trajectory.Shoreline trajectory has a better correlation with the regional sea level change.These results are typically of directive significance for the hydrocarbon exploration.

关 键 词：层序格架 滨线迁移轨迹分析 三角洲体系 沉积演化 海平面变化 珠江口盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]