Study On The Distribution And Application Of Tensor CSAMT Electromagnetic Field

In the field of electromagnetic method,has been using the method of scalar detecting underground structure,a scalar measurement in the detection of complex geological structure does not reflect its anisotropy,Ways and tensor detection to the underground emission polarization direction and the different types of vector field,to solve the problem of anisotropic geological body,based on basic theories and methods of the tensor CSAMT technology was studied,and the application of tensor CSAMT has guiding significance.Firstly,This article study the CSAMT source different forms of device are studied,through the theoretical formula is derived,the method of numerical simulation of single dipole source is studied respectively,L source,cross and rotation vector of the electromagnetic field distribution,and the effective observation areas delineated and analyzed,including scalar source electromagnetic field radiation pattern chart petal shaped distribution,so the detection area within a certain range Angle exists blind area;Through theoretical formula derived L and cross the electromagnetic field distribution meet the principle of vector synthesis,numerical simulation of the electromagnetic field distribution of the radiation pattern figure is equal to the horizontal direction of a single dipole source overall counterclockwise the 45 ° and 135 °,verifies the correctness of the theoretical formula is derived,and the observations within the scope of the blind area to be equivalent to the superposition of two scalar source;On this basis,the contrast rotation vector source radiation pattern diagram and the current vector diagram,found that the rotation vector source can achieve 360 ° Angle within the scope of the electromagnetic wave comprehensive coverage,its observation does not exist within the scope of blind area;Geoelectric model,the design theory of tensor-dimensional numerical simulation,summarizes all kinds of geoelectric model and vector and apparent resistivity tensor impedance variation characteristics,and on the basis of the simulation the anticline and syncline formation apparent resistivity two-dimensional distribution of the model,compare the simulation result,tensor CSAMT form the model reflect the effect is good.Finally combining tensor CSAMT in goaf,sulfide ore deposits,the examples of application in the detection of metal by comparing its and scalar CSAMT detection result and other geophysical exploration methods in one-dimensional layered electrical structure conditions,the prospecting effect of tensor and scalar measurement;Electrical structures in complex cases,the measured tensor can tensor impedance,can carry on the analysis of geological anisotropy,so as to more accurately reflect the underground geological distribution form,and in the resolution and overcome the distortion and noise is better than that of area near a scalar measurement.