最小曲率位场分离方法参数选择试验研究  

Parameter choose experimental research to the minimum curvature technique potential field data separation method

作　　者：纪晓琳[1] 王万银[1] 邱之云[1] JI Xiao-lin;WANG Wan-yin;QIU Zhi-yun(Gravity and Magnetic Institute of Chang'an University,College of Geology Engineering and Geomatics,Chang'an University,Key Laboratory of Western China's Mineral Resources and Geological Engineering,Ministry of Education,Chang'an University,Xi'an 710054,China)

机构地区：[1]长安大学重磁方法技术研究所长安大学地质工程与测绘学院长安大学西部矿产资源与地质工程教育部重点实验室

出　　处：《地球物理学进展》2019年第4期1441-1452,共12页Progress in Geophysics

基　　金：国家重点研发计划项目“典型覆盖区航空地球物理技术示范与处理解释软件平台开发”(2017YFC0602200)之课题“航空地球物理数据综合处理解释方法研究及软件开发”(2017YFC0602202);中国大洋“十三五”资源环境类课题“合同区海山地形单元识别与底质类型研究”(DY135-C1-1-03);国家科技重大专项“大型油气田及煤层气开发”之“大陆边缘盆地地球物理勘探关键技术攻关与应用技术研究”(2011ZX05030-004)课题联合资助

摘　　要：位场分离是位场解释中最困难的问题之一.本文作者曾在2015年研究了单步长非原位和原位迭代两种类型最小曲率位场分离差分迭代格式,并利用Fourier频谱分析理论研究了这两种类型迭代格式的收敛性及位场分离效果,在实际应用中如何选择有关参数就是本文研究的内容.首先,利用理论模型对迭代步长和迭代次数选择进行了模型试验,模型试验显示单步长原位迭代和叠加步长原位迭代均能收敛、且能获得较好的位场分离效果;迭代步长可根据位场分离目的选取,当位场异常迭代最大残差差值和原场均值平均相对误差差值趋于0时的迭代次数为最佳迭代次数;其次,三层组合模型位场分离试验再次验证了原位迭代最小曲率位场分离方法的有效性.最后,利用西非中南段加蓬盆地卫星测高重力异常数据处理试验显示了最小曲率位场分离方法的实用性.One of the difficult problem in potential field data interpretation is the separation of regional and residual anomalies from the total anomaly.Author did research on the two types of minimum curvature potential field separation difference iterative format of the single step iteration non in situ and in situ iterative in 2015,and the convergence and potential field separation effect have been studied by using Fourier spectrum analysis theory.How to choose the parameters is the research content of this paper.first of all we discussed the choosing of the iteration step and the iteration time using the theory model.By research,single step in situ iterative and superposition step iterative in situ are convergent and can get the better potential field separation results.Choosing of the iteration step depends on the purpose of the separation of the potential field.It is the optimal iteration times when the potential field anomaly iteration maximum residual and the observation field anomaly mean average relative error are tend to zero.We verified the effectiveness of the method using the combination of three layers models,but the step by step potential field separation method need to be research deeply.Then,use the satellite altimetry gravity anomaly of the Gabon basin in south central section of West Africa to prove that the minimum curvature method can be used for the separation of the field data.

关 键 词：最小曲率 原位迭代 单步长 叠加步长 迭代步长 迭代次数 位场分离 

分 类 号：P631[天文地球—地质矿产勘探]