航磁梯度数据化极处理及其在不同纬度地区的适用性研究（英文）
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摘要
本文通过理论推导说明航磁梯度数据应该进行化极及如何化极才能更好地应用于地质解释,本文针对梯度数据化极前后的总梯度模和水平梯度模的异常形态特征开展研究,设计了不同纬度地区地磁场方向和地质体磁化方向相一致,以及不一致的模型,并讨论梯度数据化极前后如何利用总梯度模和水平梯度模方法进行解释。认为在利用总梯度模方法判断地质体位置时,梯度数据或总场数据不进行化极处理的效果更好,从而尽可能地保证数据的原始真实性,利用水平梯度模在判断地质边界时需要进行化极处理才能达到预期的效果。最后通过实际数据的分析验证了本文设计的理论模型的正确性。这也为总梯度模和水平梯度模方法较好地应用于地质解释奠定了基础。
Aeromagnetic gradient data needs to be reduced to the pole so that it can be better applied to geological interpretation through theoretical derivation.In this paper,we conduct research on the morphological characteristics of the total and horizontal gradient modules before and after reduction to the pole and design models at different latitudes,with consistent and inconsistent magnetic field direction and geological body magnetization direction.We discuss how to use the total gradient module and horizontal gradient module in geological interpretation.The reduced-to-the-pole(RTP) method is required for the horizontal gradient module method but not for the total gradient module.Finally,the conclusions derived from the theoretical models are verified through analysis of real data.The position determination of a geological body using the total gradient method,gradient data,or total-field data works better without RTP,ensuring data primitive authenticity.However,the horizontal gradient module should be reduced to the pole to determine the boundary of the geological body.Finally,the theoretical model is verified by actual data analysis.Both the total and horizontal gradient methods can be applied to geological interpretation.
Aeromagnetic gradient data needs to be reduced to the pole so that it can be better applied to geological interpretation through theoretical derivation.In this paper,we conduct research on the morphological characteristics of the total and horizontal gradient modules before and after reduction to the pole and design models at different latitudes,with consistent and inconsistent magnetic field direction and geological body magnetization direction.We discuss how to use the total gradient module and horizontal gradient module in geological interpretation.The reduced-to-the-pole(RTP) method is required for the horizontal gradient module method but not for the total gradient module.Finally,the conclusions derived from the theoretical models are verified through analysis of real data.The position determination of a geological body using the total gradient method,gradient data,or total-field data works better without RTP,ensuring data primitive authenticity.However,the horizontal gradient module should be reduced to the pole to determine the boundary of the geological body.Finally,the theoretical model is verified by actual data analysis.Both the total and horizontal gradient methods can be applied to geological interpretation.
引文
Ansari,A.H.,and Alamdar,K.,2009,Reduction to the pole of magnetic anomalies using analytic signal:World Applied Sciences Journal,7(4),405-409.
Baranov,V.,1957,A new method for interpretation of aeromagnetic maps:Pseudo-gravimetric anomalies:Geophysics,22(2),359-383.
Baranov,V.,and Naudy,H.,1964,Numerical calculation of the formula of reduction to the magnetic pole:Geophysics,29(1),67-79.
Blakely,R.J.,1996,Potential theory in gravity and magnetic applications:New York:Cambridge University Press.
Ervin,C.P.,1976,Reduction to the magnetic pole using a fast fourier series algorithm:Computers&Geosciences,2(2),211-217.
Godio,A.,and Piro,S.,2005,Integrated data processing for archeological magnetic surveys:Society of Exploration Geophysicists,24(11),1138-1144.
Guan,Z.N.,et al,1993,Theoretical analysis and application of the important problem in magnetic prospecting:Geological Publishing House,76-80.
Guan,Z.N.,Hou,J.S.,and Yao,C.L.,1996,Application of aeromagnetic gradient data in geological mapping ang metallogenetic prognosis of gold deposits:Geoscience,(in Chinese),10(2),239-249.
Guan,Z.N.,and Yao,C.L.,1997,Inversion of the total gradient modulus of magnetic anomaly due to dipping dike:Social Sciences Edition Journal of China University Geosciences(in Chinese),22(1),81-85.
Gunn,P.J.,1975,Linear transformations of gravity and magnetic fields:Geophysical Prospecting,23(2),300-312.
Hansen,R.O.,and Pawlowski,R.S.,1989,Reduction to pole at low latitudes by Wiener filtering:Geophysics,54(12),1607-1613.
Huang,L.P.,and Guan,Z.N.,1998,The determination of magnetic causative boundaries using total gradient modules of magnetic anomalies:Journal of East China Geological Institute(in Chinese),21(2),143-150.
Keating,P.,and Zerbo,L.,1996,An improved technique for reduction to the pole at low latitudes:Geophysics,61(1),131-137.
Li,X.L.,and Chang,S.S.,2009,Aeromagnetic gradient survey and elementary application in sandstone type uranium deposits prospecting:Uranium Geology(in Chinese),25(6),355-360.
Li,Y.Y.,and Yang,Y.S.,2009,Derivative-based normalized standard deviation of potential field data in geological contact mapping:Geological Science and Technology Information(in Chinese),28(5),138-142.
Lin,X.X.,and Ping,W.,2012,An improved method for reduction to the pole of magnetic field at low latitude-the method of frequency conversion bidirectional damping factor:Chinese Journal of Geophysics(in Chinese),55(10),3477-3484.
Liu,J.X.,Hu,H.J.,Liu,C.M.,Han,S.L.,and Xie,X.,2006,Application of synthetical geophysical method on exploration of deep-seated resources:Geology and Exploration(in Chinese),42(4),71-74.
Nabighian,M.N.,1972,The analytic signal of twodimensional magnetic bodies with polygonal crosssection:Its properties and use for automated anomaly interpretation:Geophysics,37(3),507-517.
Pedersen,L.B.,and Rasmussen,T.M.,1990,The gradient tensor of potential field anomalies;some implications on data collection and data processing of maps:Geophysics,55(12),1558-1566.
Peter,H.,1986,The application of aeromagnetic gradient survey method for prospecting gold deposits in Quebec Waerdeao mining area:Foreign Geoexploration Technology(in Chinese),31-36.
Qi,M.,Zhang,B.L.,Fu,C,et al,2009,Fast discovery of concealed Cu-W polymetallic deposit in central inner Monggulia by applying comprehensive exploration methods:Geology and Exploration(in Chinese),45(6),676-682.
Silva,J.B.C,1986,Reduction to the pole as an inverse problem and its application to low-latitude anomalies:Geophysics,51(2),369-382.
Sun,Y.M.,Li,Q.X.,Xu,H.P.,et al.,1995,Image processing and programming of data conversion in the geophysical data field:Jilin Science&Technology Press,Changchun,China,10-78.
Wang,J.R.,and Sun,L.C,1990,The application of resistivity medium gradient method to the exploration of ground cracks in Xi'an:Geophysical and Geochemical Exploration(in Chinese),14(6),473-476.
Wu,W.X.,Fan,W.Y.,and Wang,Y.H.,2013,Determination of the magnetic source boundary based on total gradient module analysis and its prospecting significance:Geology and Exploration(in Chinese),49(6),1164-1169.
Xian,J.A.,Guo,Y R,Liang,K.J.,and Chen,K.D.,2013,Difference of the measured 3-dimension AT gradient of air magnetic survey and conversion of the 3-dimension AT gradient:Contributions to Geology and Mineral Resources Research(in Chinese),28(2),297-300.
Zhang,C.D.,2006,Airborne tensor magnetic gradiometrythe latest progress of airborne magnetometric technology:Chinese Journal of Engineering Geophysics(in Chinese),3(5),354-361.
Baranov,V.,1957,A new method for interpretation of aeromagnetic maps:Pseudo-gravimetric anomalies:Geophysics,22(2),359-383.
Baranov,V.,and Naudy,H.,1964,Numerical calculation of the formula of reduction to the magnetic pole:Geophysics,29(1),67-79.
Blakely,R.J.,1996,Potential theory in gravity and magnetic applications:New York:Cambridge University Press.
Ervin,C.P.,1976,Reduction to the magnetic pole using a fast fourier series algorithm:Computers&Geosciences,2(2),211-217.
Godio,A.,and Piro,S.,2005,Integrated data processing for archeological magnetic surveys:Society of Exploration Geophysicists,24(11),1138-1144.
Guan,Z.N.,et al,1993,Theoretical analysis and application of the important problem in magnetic prospecting:Geological Publishing House,76-80.
Guan,Z.N.,Hou,J.S.,and Yao,C.L.,1996,Application of aeromagnetic gradient data in geological mapping ang metallogenetic prognosis of gold deposits:Geoscience,(in Chinese),10(2),239-249.
Guan,Z.N.,and Yao,C.L.,1997,Inversion of the total gradient modulus of magnetic anomaly due to dipping dike:Social Sciences Edition Journal of China University Geosciences(in Chinese),22(1),81-85.
Gunn,P.J.,1975,Linear transformations of gravity and magnetic fields:Geophysical Prospecting,23(2),300-312.
Hansen,R.O.,and Pawlowski,R.S.,1989,Reduction to pole at low latitudes by Wiener filtering:Geophysics,54(12),1607-1613.
Huang,L.P.,and Guan,Z.N.,1998,The determination of magnetic causative boundaries using total gradient modules of magnetic anomalies:Journal of East China Geological Institute(in Chinese),21(2),143-150.
Keating,P.,and Zerbo,L.,1996,An improved technique for reduction to the pole at low latitudes:Geophysics,61(1),131-137.
Li,X.L.,and Chang,S.S.,2009,Aeromagnetic gradient survey and elementary application in sandstone type uranium deposits prospecting:Uranium Geology(in Chinese),25(6),355-360.
Li,Y.Y.,and Yang,Y.S.,2009,Derivative-based normalized standard deviation of potential field data in geological contact mapping:Geological Science and Technology Information(in Chinese),28(5),138-142.
Lin,X.X.,and Ping,W.,2012,An improved method for reduction to the pole of magnetic field at low latitude-the method of frequency conversion bidirectional damping factor:Chinese Journal of Geophysics(in Chinese),55(10),3477-3484.
Liu,J.X.,Hu,H.J.,Liu,C.M.,Han,S.L.,and Xie,X.,2006,Application of synthetical geophysical method on exploration of deep-seated resources:Geology and Exploration(in Chinese),42(4),71-74.
Nabighian,M.N.,1972,The analytic signal of twodimensional magnetic bodies with polygonal crosssection:Its properties and use for automated anomaly interpretation:Geophysics,37(3),507-517.
Pedersen,L.B.,and Rasmussen,T.M.,1990,The gradient tensor of potential field anomalies;some implications on data collection and data processing of maps:Geophysics,55(12),1558-1566.
Peter,H.,1986,The application of aeromagnetic gradient survey method for prospecting gold deposits in Quebec Waerdeao mining area:Foreign Geoexploration Technology(in Chinese),31-36.
Qi,M.,Zhang,B.L.,Fu,C,et al,2009,Fast discovery of concealed Cu-W polymetallic deposit in central inner Monggulia by applying comprehensive exploration methods:Geology and Exploration(in Chinese),45(6),676-682.
Silva,J.B.C,1986,Reduction to the pole as an inverse problem and its application to low-latitude anomalies:Geophysics,51(2),369-382.
Sun,Y.M.,Li,Q.X.,Xu,H.P.,et al.,1995,Image processing and programming of data conversion in the geophysical data field:Jilin Science&Technology Press,Changchun,China,10-78.
Wang,J.R.,and Sun,L.C,1990,The application of resistivity medium gradient method to the exploration of ground cracks in Xi'an:Geophysical and Geochemical Exploration(in Chinese),14(6),473-476.
Wu,W.X.,Fan,W.Y.,and Wang,Y.H.,2013,Determination of the magnetic source boundary based on total gradient module analysis and its prospecting significance:Geology and Exploration(in Chinese),49(6),1164-1169.
Xian,J.A.,Guo,Y R,Liang,K.J.,and Chen,K.D.,2013,Difference of the measured 3-dimension AT gradient of air magnetic survey and conversion of the 3-dimension AT gradient:Contributions to Geology and Mineral Resources Research(in Chinese),28(2),297-300.
Zhang,C.D.,2006,Airborne tensor magnetic gradiometrythe latest progress of airborne magnetometric technology:Chinese Journal of Engineering Geophysics(in Chinese),3(5),354-361.