基于航空重、磁数据的南黄海海相地层分布特征识别  

Characteristics of marine strata distribution in South Yellow Sea based on airborne gravity and magnetic data

作　　者：佟晶 张婉 张玄杰 熊盛青 TONG Jing;ZHANG Wan;ZHANG Xuanjie;XIONG Shengqing(China Aero Geophysical Survey and Remoter Sensing Center for Natural Resources, Bejing 100083, China)

机构地区：[1]中国自然资源航空物探遥感中心,北京100083

出　　处：《中国地质调查》2020年第5期95-106,共12页Geological Survey of China

基　　金：中国地质调查局“南海雷琼东部海域航空物探调查(编号:DD20190210)”项目资助。

摘　　要：基于南黄海海域实测高精度航空重、磁数据,结合航空重、磁场及物性特征,通过平均对数功率谱分析匹配滤波方法技术,对南黄海海相地层界面起伏引起的重、磁异常特征进行分离、提取,采用切线法和外奎尔法计算海相地层界面的深度,经地质和地球物理综合解释,编制了南黄海海相地层底界面、顶界面深度图及海相地层厚度图。在此基础上,初步划分了南黄海海相地层构造单元,探讨了南黄海海相地层的分布特征。苏北—南黄海坳陷区的中部坳陷和南部坳陷均发育在强磁性基底之上,构造变形较弱,海相地层保存完整,埋藏浅,厚度为4~8 km,是南黄海地区具有较大资源潜力的油气勘探区。Based on the high accuracy airborne gravity and magnetic data of South Yellow Sea,combined with the characteristics of gravitational and magnetic field and geophysical properties,the authors analyzed the matched filtering through radially averaged logarithmic power spectrum to separate and extract the gravity and magnetic anomaly caused by the interfacial fluctuation of marine strata.And the depth of the marine strata interface of South Yellow Sea was interpreted by the tangent and Vaquier methods.The authors also compiled the depth of the bottom and top interface of the marine strata after geological and geophysical interpretations.In addition,a preliminary division of South Yellow Sea marine strata tectonic units was carried out and the strata distribution was also discussed.The central depression and southern depression of Subei-South Yellow Sea depression area were developed on the strongly magnetic basement,with weak tectonic deformation.The marine strata remain intact with a shallow depth of 4 km to 8 km.South Yellow Sea is the oil and gas exploration area with great resource potential.

关 键 词：航空重、磁数据 磁性基底 印支期构造运动界面 海相地层 南黄海 

分 类 号：P631.1[天文地球—地质矿产勘探] P631.222[天文地球—地质学]