李桐林^1,,
石会彦^1,,,
郭志宏²,
张功成³,
张镕哲¹,
陈汉波¹
1. 吉林大学地球探测科学与技术学院, 长春 130026
2. 中国地质调查局国土资源航空物探遥感中心, 北京 100083
3. 中海油研究总院, 北京 100027

基金项目: 国家重大科技专项大型油气田及煤层气开发（2016ZX05026-007-01）资助


详细信息

作者简介: 李桐林, 男, 1962年生, 教授, 博士生导师, 主要从事电磁法理论和应用研究.E-mail:litl@jlu.edu.cn

通讯作者: 石会彦, 男, 1995年生, 硕士研究生, 主要从事位场数据处理与解释.E-mail:1316010213@qq.com

中图分类号: P631;P738

收稿日期:2018-01-16
修回日期:2018-05-09
上线日期:2018-10-05

Research on deep structure of the South China Sea based on satellite gravity and magnetic data

LI TongLin^1,,
SHI HuiYan^1,,,
GUO ZhiHong²,
ZHANG GongCheng³,
ZHANG RongZhe¹,
CHEN HanBo¹
1. College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China
2. China Aero Geophysical Survey and Remote Sensing Center foe Land and Resources, Beijing 100083, China
3. CNOOC Research Institute, Beijing 100027, China


More Information

Corresponding author: SHI HuiYan,E-mail:1316010213@qq.com

MSC: P631;P738

--> Received Date: 16 January 2018
Revised Date: 09 May 2018
Available Online: 05 October 2018


摘要
摘要:南海深部构造对研究南海构造演化和油气勘探具有重要意义.本文对南海地区的自由空气重力异常进行布格校正、海水层校正和沉积层校正，得到布格重力异常，再对布格重力异常进行区域异常和局部异常分离，利用位场界面反演方法对区域布格异常进行反演计算得到研究区域的莫霍面深度分布；采用全变倾角化极方法对研究区域的卫星磁异常数据进行化极处理，并进一步对化极磁异常作向上延拓，得到延拓后化极磁异常结果.分析布格重力异常、莫霍面深度及化极磁异常特征，结合天然地震层析成像的证据，得到以下结论：推测南海北部陆缘的古俯冲带位置是从118.5°E，24°N沿北东向延伸至109°E，15°N；红河断裂入海后经过莺歌海盆地在海南岛南部转为南北向与越东断裂相接并延伸至万安盆地；推测中特提斯洋的部分闭合位置是从110°E，2°N到101°E，21°N.
关键词: 古俯冲带/
红河断裂/
中特提斯洋/
莫霍面

Abstract:The deep structure of the South China Sea is of great significance for studying the tectonic evolution and hydrocarbon exploration in the South China Sea. In this work, the free air gravity anomalies in this region are processed by Bouguer, sea water and sedimentary layer corrections. And then the Bouguer gravity anomalies were obtained and separated into the regional and local anomalies. The inversion of the regional Bouguer anomalies was conducted to delineate the Moho interface of the study area. The total dipole polarization method was used to polarize the satellite magnetic anomaly data which was reduced to the pole and further continued upward. Analysis of the Bouguer gravity anomalies, the Moho depth and the reduction-to-the pole magnetic anomalies, combining with seismic tomography, the following conclusions were obtained:The location of the ancient subduction zone in the northern South China Sea is estimated to be from 119°E and 24°N along northeast extending to 110°E, 15°N. The Red river fault, after entering the sea through the Yinggehai basin in southern Hainan Island turns to the north-south direction, linking the Yuedong fault, and extending to the Wanan basin. It is speculated that the Meso-Tethys ocean partially closed in from 110°E, 2°N to 101°E, 21°N.
Key words:Ancient subduction zone/
Red river fault/
Meso-Tethys ocean/
Moho surface



PDF全文下载地址:

http://www.geophy.cn/data/article/export-pdf?id=dqwlxb_14726