南沙地块南薇隆起区的地震反射特征和结构单元划分

发布时间：2018-01-06 12:30

本文关键词：南沙地块南薇隆起区的地震反射特征和结构单元划分　出处：《海洋地质与第四纪地质》2017年02期 　论文类型：期刊论文

【摘要】：南薇隆起区地处南沙地块西北部,紧邻西南次海盆,周围发育大量陆缘裂解盆地。裂陷盆地拥有丰富的油气资源。地块经历了中生代末期至古近纪裂谷拉张,并随晚始新世的海底扩张向南漂移至现今位置。结合区域以往地震剖面和钻井数据,分析了2013年中科院南海海洋研究所"实验2号"采集的高分辨率单道地震数据(Nan-1),总结了南薇隆起区的地震反射特征。认为南薇隆起区主要由南部裂陷下沉带和北部埋藏火山隆起带两个结构单元组成。从北到南,埋藏火山隆起带跨越约63km的范围,裂陷下沉带跨越约58km的范围。地震剖面清晰地揭示了该区向海盆侧隆起且在SE向成带的特征。南薇区具有拉张背景,其形成与演化主要是与西南次海盆的扩张作用,以及南沙地块与婆罗洲地块的碰撞作用等有关。自上新世以来,整个南薇隆起区进入构造活动相对稳定阶段,地壳稳定性较好。
[Abstract]:The South Wei uplift area located in the northwest of Nansha massif, near the southwest sub basin, around the development of a large number of splitting of continental margin basin. Rift basin has abundant oil and gas resources. Plots experienced in Late Mesozoic and Paleogene rifting and late Eocene, with seafloor spreading southward drift to present position. Combined with the regional past seismic and drilling data, analysis of the 2013 Ocean Research Institute "Experiment 2" acquisition of high resolution single channel seismic data (Nan-1), summarizes the seismic reflection characteristics of Southern Wei uplift. Think South Wei uplift mainly by the southern rift subsidence zone and the northern uplift zone two volcano buried structure unit. From north to south, buried volcano uplift across a range of about 63km, rift subsidence zone across a range of about 58km. The seismic profile clearly reveals the characteristics of the basin area to the side and to uplift in SE. The South Wei region The formation and evolution of the extensional background is mainly related to the expansion of the southwest sub basin and the collision between the Nansha block and the Borneo block. Since the Pliocene, the whole South Wei uplift area has entered a relatively stable stage of tectonic activity, and the crust stability is relatively good.

【作者单位】：中国科学院边缘海与大洋地质重点实验室中国科学院南海海洋研究所;中国科学院大学;金属矿山安全技术国家重点实验室长沙矿山研究院有限责任公司;
【基金】：国家重点基础研究发展计划项目(2013CB956104) 国家自然科学基金项目(41376063)
【分类号】：P618.13;P631.4
【正文快照】： 3.金属矿山安全技术国家重点实验室长沙矿山研究院有限责任公司,长沙410012)作为西太平洋边缘海中最大的海盆之一,南海存在多个明显由大陆张裂分离及海底扩张形成的海盆。就海盆扩张顺序,Briais等认为西北次海盆和东部次海盆在约30 Ma开始扩张,后逐渐向西南方向扩张,西南次海

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