东海陆架盆地重震联合解释推断研究  

Deducing the East China Sea shelf basin by jointing gravity and seismic data

作　　者：陈晓红[1] 刘展[1] 张志珣[2] 杨慧良[2] 侯方辉[2] 王志敏 

机构地区：[1]中国石油大学(华东),青岛266580 [2]青岛海洋地质研究所,青岛266071 [3]中石化胜利油田,东营257000

出　　处：《地球物理学进展》2013年第3期1596-1601,共6页Progress in Geophysics

基　　金：海洋地质保障工程项目(1212010611301)资助

摘　　要：目前,我国海洋区域地质调查以重磁为主,辅以二维地震,用单一的物探方法难以探测海区沉积盆地中的各个密度界面,本文充分发挥地震、重力和磁力资料的特点,进行优势互补,利用重震联合界面反演技术,对东海陆架盆地的三个密度界面,上新统底界面、中新统底界面和沉积基底进行反演,利用反演结果对研究区的构造区划进行重新认识.东海陆架盆地西部凹陷基本缺失渐新统,海礁凸起南北两块的分界处东西方向的长度较短,钱塘凹陷向东北方向延伸较长,东部西湖凹陷地层发育齐全,新生代沉积厚度大,沉降幅度大,底界面在11794米左右.说明利用重震联合密度界面反演及解释是一项可行的技术.At present, China＇s ocean regional geological survey mainly depends on gravity and magnetic prospecting, and 2D seismic prospecting is an important auxiliary, It＇s difficult to detect every density interface in sedimentation basin in the sea area. In this paper, we give full play to the characteristics of seismic, gravity and magnetic data, complementing each other＇s advantages. We inverted three density interfaces of the East China Sea shelf basin by the technology of seismic-gravity joint inversion. The three interfaces include the bottom of Pliocene series, Miocene series and sedimentary base. The inversion results can draw new conclusions on tectonic division. The west of the East China Sea shelf basin almost losses Oligocene, the dividing line between north and south block of haijiao uplift should be shorter in the west and east direction. Qiantang sag extended longer in the northeast. The formations of xihu sag were completely developed, the thickness and the subsidence amplitude of Cenozoic sedimentary is big, and the basement base is about 11794 meters. It is proved that the interpretation method by jointing gravity and seismic data is an effective technique.

关 键 词：东海陆架盆地 密度界面反演 重力异常分离 

分 类 号：P738[天文地球—海洋地质]