An invernsion scheme with lateral segmented-combined constraints for time-domain airborne electromagnetic data
LIN Xingyuan1, LU Congde1, ZHONG Binghui2, FAN Chongxiao1
1. College of Geophysics, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. College of Information Science and Technology, Chengdu University of Technology, Chengdu, Sichuan 610059, China
Abstract:In order to ensure lateral continuity,lateral roughness constraints are applied in the inversion of time-domain airborne electromagnetic data.However,the lateral roughness constraint inversion requires multiple points to be calculated simultaneously and the calculation time of inversion increases sharply when the number of points increases up to a certain amount.Taking into account the lager data set of time-domain airborne electromagnetic,we propose an inversion scheme with lateral segmented-combined constraints.First,observation points are segmented.Then the lateral and vertical roughness constraints are used simultaneously in each data segment,and the lateral priori information constraint is used between the segments.Finally,effects of lateral and vertical roughness constraints and lateral prior information constraints on inversion accuracy and computation time are analyzed.The proposed inversion scheme can effectively reduce the calculation time with the segmentation.The lateral and vertical roughness constraints can ensure high inversion accuracy.Test of modeling data and real data verify the validity,calculation effectivity,and applicability of the proposed invernsion scheme.
殷长春,黄威,贲放.时间域航空电磁系统瞬变全时响应正演模拟[J].地球物理学报,2013,56(9):3153-3162.YIN Changchun,HUANG Wei,BEN Fang.The full-time electromagnetic modeling for time-domain airborne electromagnetic systems[J].Chinese Journal of Geophysics,2013,56(9):3153-3162.
[2]
Pfaffhuber A A,Monstad S,Rudd J.Airborne electro-magnetic hydrocarbon mapping in Mozambique[J].Exploration Geophysics,2009,40(3):237-245.
[3]
Smith R.Airborne electromagnetic methods:applications to minerals,water and hydrocarbon exploration[C].CSEG 2010 Distinguished Lecture,2010,7-10.
[4]
Siemon B,Christiansen A V,Auken E.A review of helicopter-borne electromagnetic methods for groundwater exploration[J].Near Surface Geophysics,2009,7(5-6):629-646.
[5]
Vallee M A,Smith R S.Application of Occam's in-version to airborne time-domain electromagnetics[J].The Leading Edge,2009,28(3):284-287.
[6]
Viezzoli A,Auken E,Munday T.Spatially constrained inversion for quasi 3D modelling of airborne electromagnetic data:an application for environmental assessment in the lower Murray region of South Australia[J].Exploration Geophysics,2009,40(1):173-183.
[7]
Wolfgram P,Sattel D,Christensen N B.Approximate 2D inversion of AEM data[J].Exploration Geophy-sics,2003,34(2):29-33.
[8]
Cox L H,Wilson G A,Zhdanov M S.3D inversion of airborne electromagnetic data[J].Geophysics,2012,77(4):59-69.
[9]
Haber E,Schwarzbach C.Parallel inversion of large-scale airborne time-domain electromagnetic data with multiple OcTree meshes[J].Inverse Problem,2014,30(5):1-28.
[10]
Yang D,Oldenbuurg D W,Haber E.3-D inversion of airborne electromagnetic data parallelized and accele-rated by local mesh and adaptive soundings[J].Geophysical Journal International,2014,196(3):1492-1507.
[11]
Constable S C,Parker R L,Constable C G.Occam's inversion:a practical algorithm for generating smooth models from electromagnetic sounding data[J].Geophysics,1987,52(3):289-300.
[12]
陈小斌,赵国泽,汤吉,等.大地电磁自适应正则化反演算法[J].地球物理学报,2005,48(4):937-946.CHEN Xiaobin,ZHAO Guoze,TANG Ji,et al.An adaptive regularized inversion algorithm for magnetotelluric data[J].Chinese Journal of Geophysics,2005,48(4):937-946.
[13]
毛立峰,王绪本,陈斌.直升机航空瞬变电磁自适应正则化一维反演方法研究[J].地球物理学进展,2011,26(1):300-305.MAO Lifeng,WANG Xuben,CHEN Bin.Study on an adaptive regularized 1D inversion method of helicopter TEM data[J].Progress in Geophysics,2011,26(1):300-305.
[14]
罗勇,陆从德,王宇航.时间域航空瞬变电磁一维阻尼特征参数反演方法[J].地球物理学进展,2014,29(6):2723-2729.LUO Yong,LU Congde,WANG Yuhang.1D inversion method based on damped eigen parameter for airborne time domain electromagnetic data[J].Progress in Geophysics,2014,29(6):2723-2729.
[15]
昌彦君,肖明顺,武毅.瞬变电磁数据一维反演的初值选取研究[J].石油地球物理勘探,2010,45(2):295-298.CHANG Yanjun,XIAO Mingshun,WU Yi.Studies on initial parameter selection of one-dimensional inversion for transient electromagnetic data[J].Oil Geo-physical Prospecting,2010,45(2):295-298.
[16]
Auken E,Christiansen A V.Layered and laterally con-strained 2D inversion of resistivity data[J].Geophy-sics,2004,69(3):752-761.
[17]
Auken E,Christiansen A V,Jacobsen L H.A resolution study of buried valleys using laterally constrained inversion of TEM data[J].Journal of Applied Geophysics,2008,65(1):10-20.
[18]
Vallee M A,Smith R S.Inversion of airborne time-domain electromagnetic data to a 1D structure using la-teral constraints[J].Near Surface Geophysics,2009,7(1):63-71.
[19]
蔡晶,齐彦福,殷长春,等.频率域航空电磁数据的加权横向约束反演.地球物理学报,2014,57(1):953-960.CAI Jing,QI Yanfu,YIN Changchun,et al.Weighted laterally-constrained inversion of frequency-domain airborne EM data[J].Chinese Journal of Geophysics,2014,57(1):953-960.
[20]
Siemon B,Auken E,Christiansen A V.Laterally con-strained inversion of helicopter-borne frequency-do-main electromagnetic data[J].Journal of Applied Geo-physics,2009,67(3):259-268.
[21]
Yu X D,Wang X B,Lu C D,et al.A combining regu-larization strategy for inversion of airborne time-domain electromagnetic data[J].Journal of Applied Geo-physics,2018,155(1):110-121.
[22]
Jupp D L B,Vozoff K.Stable iterative methods for the inversion of geophysical data.Geophysical Journal of the Royal Astronomical Society,1975,42(3):957-976.
[23]
Farquharson C G and Oldenburg D W.Non-linear inversion using general measures of data misfit and model structure[J].Geophysical Journal Internatio-nal,1998,134(1):213-227.
[24]
Menke W.Geophysical Data Analysis:Discrete In-verse Theory[M].Academic Press Inc,New York,1989.
[25]
Marquart D.An algorithm for least squares estimation of nonlinear parameters[J].Journal of the Society for Industrial and Applied Mathematics,1963,11(2):431-441.
[26]
Wilson G A,Raiche A P,Sugeng F.2.5D inversion of airborne electromagnetic data[J].Exploration Geophysics,2006,37(4):363-371.
[27]
Bedrosian P A,Ball L B,Bloss B R.Airborne electromagnetic data and processing within Leach Lake Basin,Fort Irwin,California[R].US Geological Survey Open File Report 2013-1024,2014,1-20.https://doi.org/10.3133/ofr20131024G.