基于向下延拓Milne法的重力归一化总梯度法  

Normalized total gradient of gravity anomaly based on the downward-continuation Milne method

作　　者：石甲强 肖锋[1] 钟炀 SHI Jiaqiang;XIAO Feng;ZHONG Yang(College of Geo Exploration Sciences and Tech­nology,Jilin University,Changchun,Jilin 130026,China)

机构地区：[1]吉林大学地球探测科学与技术学院

出　　处：《石油地球物理勘探》2019年第6期1390-1396,I0015,共8页Oil Geophysical Prospecting

基　　金：国家重点研发计划“深地资源勘查开采”重点专项“航空磁场测量技术系统研制”(2017YFC0602000)资助

摘　　要：重力归一化总梯度法需进行向下延拓和垂向导数的计算,这两个过程都会放大高波数成分,影响计算结果的稳定性。为此,将向下延拓Milne法及积分垂向二阶导数法引入重力归一化总梯度的计算。将该方法应用于估算无限长水平圆柱体模型的中心位置,计算结果准确。然后针对实测重力数据,利用本方法得到的矿洞中心埋深较基于泰勒级数展开的重力归一化总梯度法更准确,因此本文方法具有一定的实用性。The normalized total gradient method of gravity anomaly includes multi-calculations of downward continuation and vertical derivative,both of them amplify the high wavenumber components.To sovle the problem,we propose a new idea for the issue in this paper.Two stable algorithms,Milne method of downward continuation and integrated vertical second derivative method,are used for the normalized total gradient of gravity anomaly.The improved method is applied to locate the center of the infinite horizontal cylinder model,and the result is accurate.In the real gravity anomaly profile data processing,compared with the normalized total gradient of gravity anomaly based on Taylor series expansion,this proposed method obtains the more accurate location of the mine center,which proves the validity and practicality of the proposed method.

关 键 词：重力归一化总梯度法 向下延拓Milne法 积分垂向二阶导数法 

分 类 号：P631[天文地球—地质矿产勘探]