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《Chinese Journal of Geophysics》 2015-08
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Multi-component full field apparent resistivity definition of multi-source ground-airborne transient electromagnetic method with galvanic sources

ZHANG Ying-Ying;LI Xiu;YAO Wei-Hua;ZHI Qing-Quan;LI Jia;College of Geology Engineering and Geomatics,Chang′an University;  
Multi-source ground-airborne transient electromagnetic method with galvanic sources has such advantages as strengthening signal intensity,weakening random disturbance,better identifying the position of geological abnormity,etc.However,so far its interpretation method has not been established yet,which restricts the development of this method.This paper chooses the most widely used interpretation parameter-apparent resistivity in our research and builds up multi-component full field apparent resistivity algorithm for multi-source ground-airborne transient electromagnetic method with galvanic sources,which provides an effective and practical interpretation tool for this method.This paper analyzes the advantages of magnetic field intensity in multi-source groundairborne transient electromagnetic interpretation and puts forward multi-source and multicomponent full field apparent resistivity algorithm for each component on the basis of inverse function theorem and iterative method.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,multi-component,full time and full space apparent resistivity definition is achieved.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 layered model changes,the differentiation of full field apparent resistivity is obvious,which can easily and intuitively identify electric layer.(3)With the change of offset,the difference among apparent resistivity curves of each component is small and they all reflect subsurface structure well.(4)As receiver altitude,offset and time are considered simultaneously in our calculation,full field apparent resistivity can achieve full space and full time apparent resistivity calculation.The results of three dimensional model with a low-resistivity anomaly show that:(1)By changing spatial location and current direction of the galvanic sources,signal intensity of different components can be strengthened or weakened.(2)Full field apparent resistivity sections of each component can all match well with the designed complex model.This paper focuses on multi-component full field apparent resistivity calculation of multisource ground-airborne transient electromagnetic method with galvanic sources.Full field apparent resistivity algorithm,which is based on inverse function theorem and iterative method,realizes multi-component,full time and full space apparent resistivity calculation and can completely,smoothly and gradually tell the subsurface electrical variations.By changing the spatial location and current direction of galvanic sources,the results of three dimensional model confirm that multi-source ground-airborne transient electromagnetic method with galvanic sources surely can strengthen signal intensity and improve signal-to-noise ratio.Besides,the effectiveness of multi-component full field apparent resistivity algorithm with magnetic field intensity for multisource ground-airborne transient electromagnetic method with galvanic sources is also verified.
【Fund】: 国家重大科研设备研制项目(ZDYZ2012-1-05-04);; 国家自然科学基金面上项目(41174108)联合资助
【CateGory Index】: P631.325
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