位场欧拉反褶积方法适用性分析及其应用  

Applicability analysis and application of Euler deconvolution method in potential field

作　　者：罗潇[1] 王彦国[1] 张瑾[1] 邓居智[1] 吴姿颖 陈姝霓 LUO Xiao;WANG Yanguo;ZHANG Jin;DENG Juzhi;WU Ziying;CHEN Shuni(Fundamental Science on Radioactive Geology and Exploration Technology Laboratory,East China University of Technology, Nanchang 330013, China)

机构地区：[1]东华理工大学放射性地质与勘探技术国防重点学科实验室,南昌330013

出　　处：《物探化探计算技术》2018年第6期789-796,共8页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金(41504098;41504054);江西省自然科学基金项目(2017BAB213030)

摘　　要：欧拉反褶积是重磁勘探常用的反演方法和资料解释工具。从单一场源出发,推导了叠加场源下的常规欧拉反褶积公式,理论分析出了异常叠加是影响常规欧拉反褶积应用效果的主要因素。为解决这一问题,可采用高阶导数来提高异常分辨率,削弱叠加影响,但高阶导数却易受高频干扰影响。为了深入研究欧拉反褶积方法的应用效果及其适用性,利用垂向导数形式的欧拉反褶积与常规欧拉反褶积进行对比分析。模型试验表明:在无噪声情况,基于垂向一阶导数的欧拉反褶积反演结果具有更高的聚合度和计算精度,可有效压制异常叠加影响;但当原异常含有噪声时,基于垂向导数的欧拉反褶积受噪声影响严重,反演效果不如常规方法,可以采用向上延拓方法来压制噪声干扰以提高高阶导数欧拉反褶积的反演精度。在江西相山实际重力资料处理中,垂向一阶导数的欧拉反褶积比常规欧拉反褶积反演出了更多的地质边界信息,而常规欧拉反褶积在主构造上反演点的连续性更强。因此,在实际资料处理中,建议常规欧拉反褶积和导数形式下的欧拉反褶积同时使用,以提高方法的解释能力。Euler deconvolution is a commonly used data interpretation tool for gravity and magnetic exploration.In this paper,we deduced the conventional Euler deconvolution formula for the superimposed field source,and theoretically analyzes that the anomaly superposition is the main factor that affects the effect of Euler deconvolution.Higher order derivatives can be used to overcome this problem,but which are susceptible to high frequency interference.In order to study the application effect of Euler deconvolution,we made a comparative analysis between the vertical derivative Euler deconvolution and the conventional Euler deconvolution.Model tests show that the inversion result by Euler deconvolution of first vertical derivative has higher degree of polymerization and calculation accuracy in the situation of noise free;however,when the original anomaly contains noise,Euler deconvolution based on vertical derivative was seriously affected by noise,and the result was not as good as that of conventional methods.Upward continuation method can be used to suppress noise interference to improve the inversion result.In the application of gravity data from Xiangshan,Jiangxi,the Euler deconvolution of vertical first derivative can obtain more geological boundary information than conventional Euler deconvolution,while the conventional method has stronger continuity of the inversion results on the main structure.Therefore,in the actual data processing,it is recommended that the conventional Euler deconvolution and Euler deconvolution of vertical derivative be used simultaneously to improve the interpretation of the method.

关 键 词：位场 欧拉反褶积 叠加异常 垂向导数 反演效果 

分 类 号：P631.2[天文地球—地质矿产勘探]