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《Chinese Journal of Geophysics》 2015-01
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Inverse Synthetic Aperture Imaging of Ground-Airborne transient electromagnetic method with a galvanic source

LI Xiu;ZHANG Ying-Ying;LU Xu-Shan;YAO Wei-Hua;College of Geology Engineering and Geomatics,Chang′an University;  
Ground-Airborne transient electromagnetic method with a galvanic source has suchadvantages as high efficiency,great exploration depth,high signal to noise ratio and good performance in mountainous areas.However,so far its interpretation system has not been established,which restricts the development of this method.This paper aims at building up a complete Ground-Airborne electromagnetic detection system to enrich the theory of this method.This paper consists of three parts:(1)full field apparent resistivity definition;(2)Kirchhoff immigration of TEM virtual wave field;(3)inverse synthetic aperture imaging.Magnetic field intensity is selected for full field apparent resistivity definition.The results of theoretical models show that the first and last part of the apparent resistivity curve can reach the resistivity of the first and the last layer,respectively.Thus,full space and full time apparent resistivity definition is achieved.Based on the previous study,Kirchhoff migration of Ground-Airborne transient electromagnetic method with a galvanic source is realized.Correlation method is adopted for multiple survey point synthesis,which pushes traditional single point processing forward pointby-point multi-coverage inverse synthetic aperture processing.The results of layered models show that:(1)Full field apparent resistivity can tell the underground electric change smoothly,completely and gradually.(2)When the resistivity of the middle layer changes,the differentiation of full field apparent resistivity is obvious,which can easily and intuitively identify electric layer.(3)As receiver altitude,offset and time are considered simultaneously,full field apparent resistivity can achieve full space and full time apparent resistivity calculation.The results of the complex model with a water bearing gob shows that:(1)The further the offset from the gob is,the weaker the resistivity anomaly on full field apparent resistivity section is.(2)There are two interfaces from the Kirchhoff immigration results,the upper one indicates surface.As the electric difference between earth and air is large,the wave field signal of this interface is strong and spreads over the whole area.While the anomaly of the lower interface mainly distributes in the middle area and weakens outwards,which indicates the water bearing gob.(3)The upper interface changes little after inverse synthetic aperture imaging,while the gob anomaly narrows and has a clear boundary.The anomaly boundary matches well with the designed model.Inverse synthetic aperture imaging of GroundAirborne transient electromagnetic method with a galvanic source is realized on the basis of Inverse Synthetic Aperture Radar(ISAR).Full field apparent resistivity is put forward with inverse function and iteration,which can realize full zone and full time apparent resistivity calculation.Pseudo-seismic immigration of transient electromagnetics is used in 3Dtransient field imaging.Inverse synthetic aperture radar is introduced in inverse synthetic aperture imaging of Ground-Airborne transient electromagnetic method with a galvanic source,which can help improve resolution.The results of designed models show that correlation can strengthen useful signal and improve signal to noise ratio and resolution,which prove the efficiency of inverse synthetic aperture imaging of Ground-Airborne transient electromagnetic method with a galvanic source.
【Fund】: 国家自然科学基金面上项目(41174108);国家自然科学基金重点项目(51139004)联合资助;; 国家重点基础研究发展计划(973计划)项目(2013CB036002)
【CateGory Index】: P631.325
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