文献类型：期刊文献

中文题名：珠江口盆地陆丰13洼原型盆地类型与分段差异演化

英文题名：Prototype basin types and segmental differential evolution of LF13 subsag in the Pearl River Mouth basin

作者：钟锴[1,2];李洪博[3,4];刘绍文[5];肖张波[3,4];边利豪[1,2];吴迪[5];冯凯龙[1,2,6]

机构：[1]同济大学海洋地质国家重点实验室,上海200092;[2]同济大学海洋资源研究中心,上海200092;[3]中海石油(中国)有限公司深圳分公司,广东深圳518000;[4]中海石油深海开发有限公司,广东深圳518000;[5]南京大学地理与海洋学院海岸与海岛开发教育部重点实验室,江苏南京210046;[6]广东海洋大学船舶与海洋工程系,广东湛江524005

年份：2024

卷号：36

期号：3

起止页码：60

中文期刊名：中国海上油气

外文期刊名：China Offshore Oil and Gas

收录：北大核心2023、CSTPCD、、CSCD2023_2024、北大核心、CSCD

基金：国家自然科学基金重点项目“南亚-东南亚特提斯演化的油气资源效应(编号:92055203)”;中海石油(中国)有限公司深圳分公司科研项目“陆丰13洼陡坡带构造-沉积响应及油气成藏规律研究(编号:CCL2023SZPS0055)”部分研究成果。

语种：中文

中文关键词：珠江口盆地;陆丰13洼;原型盆地;差异演化;岩浆底侵;热机制

外文关键词：Pear River Mouth basin;LF13 subsag;prototype basin;differential evolution;magma underplating;thermal mechanism

中文摘要：陆丰13洼是珠江口盆地东部的传统重点探区,当前油气勘探缺乏领域性和规模性目标,因此有必要对洼陷进行整体分析和区域解剖,开展原型盆地恢复、构造分段差异性等基础地质研究。研究表明,13西洼原型盆地为典型的北断南超箕状半地堑,具脆性变形特征,西段为继承型半地堑,东段为弱迁移型半地堑。13东洼具明显的构造分段差异性:西段原型盆地为迁移型叠合洼陷,裂陷晚期(恩平期)断拗叠置于裂陷早期(文昌期)箕状半地堑上,应为基底以深岩浆底侵带不断向北迁移所致;中段原型盆地为宽缓型半地堑和断拗叠加,控洼断裂数量多但活动性弱,具韧性变形特征,基底以深多见岩浆局部强烈底侵;东段原型盆地为北断南超箕状半地堑。在恢复洼陷各段不同裂陷阶段原型盆地的基础上,重点剖析了各段的构造样式及其演化横向差异,探讨其差异演化过程及深部动力学机制,指出岩浆底侵及热机制差异是造成陆丰13洼多类型原型盆地及其分段差异演化的控制因素,填补了珠江口盆地陆架区热机制与洼陷差异变形研究的空白。该认识对深入研究陆丰13洼基础石油地质条件及油气富集成藏的横向差异性提供科学依据,并将为下阶段油气勘探提供理论借鉴和参考。

外文摘要：LF13 subsag,a traditional hydrocarbon target of the eastern Pear River Mouth basin,currently faces the challenges of lacking of domain specific and large scale exploration targets.Therefore,it is necessary to conduct an integrative analysis and regional anatomy for the subsag,and carry out basic geological researches such as prototype basin restoration and structural segmentation differences.The results demonstrate that,the prototype basin of the western LF13 subsag is one typical dustpan-like half graben with faulting in the north and overlapping in the south,showing the characteristics of brittle deformation,and the western segment is of inherited half graben,but the eastern segment is a half graben with weak migration.However,the eastern LF13 subsag shows a remarkable difference in structural segmentation as follows:the western segment belongs to a migrating superimposed depression,and the late-rifting(Enping period)faulted-depression superimposed on the early rifting(Wenchang period)dustpan-like half graben,as the result of northward migration associated with magma underplating below the basement;the prototype basin of the middle segment is a faulted-depression superimposed with a wide and gentle half graben,and the depression-controlling faults are large in number but weak in activity,with the characteristics of ductile deformation,and intensively localized magma underplating are found below the basement;the prototype basin of the eastern segment is a dustpan-like half graben with faulting in the north and overlapping in the south.Based on the above prototype basin restoration,we anatomized the lateral differences in structural style and evolution of each segment,discussed the differential evolution process and deep dynamic mechanism as well,and proposed that the magma underplating and associated different thermal mechanisms account for the observed multiple prototype basins and segmental differential evolution of LF13 subsag,filling the blanks of research on thermal mechanism of continental shelf areas and differential deformation of sags in the Pearl River Mouth basin.The findings could not only deepen the understandings of basic petroleum geological conditions and lateral differences in hydrocarbon accumulation in the LF13 subsag,but also provide theoretical reference and guidance for hydrocarbon exploration in the next stage.