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《Chinese Journal of Geophysics》 2012-10
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Numerical modeling of responses to a tilted-coil antenna in a transversely isotropic formation

ZHANG Lei,CHEN Hao,WANG Xiu-Ming State Key Laboratory of Acoustics Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China  
We put forward a modified Numerical Mode-Matching(NMM) method in detail which is used to simulate the responses of tilted-coil antenna arrays(TCAs) in a Transversely Isotropic(TI) formation,and the vertical eigenmodes are used to model the titled loop antenna sources for convenience.Moreover,the amplitude and slope basis functions are introduced into the simulation to speed up the calculation effectively.First of all,in order to validate the reliability and accuracy,the modeling results in a simple formation model by NMM are compared with those in the 3-D simulation of the analytic approach,also the modeling results in a complex formation of NMM are compared with those by a Finite Difference Time Domain(FDTD) method.They are both in a good agreement with each other.Based on this verification,TCAs and horizontal coil antenna in a transversely isotropic formation are studied,and it is shown from the computation results that TCAs are sensitive to the vertical resistivity and the horizontal resistivity together in TI formations but horizontal coil antenna are only sensitive to the horizontal resistivity.Therefore TCAs are very useful for evaluating a Transversely Isotropic formation.And then,the effects of the metallic mandrel on the responses are discussed,it is found that although the metallic mandrel does not change the trend of the phase and the amplitude change,it does influence the absolute value of the two signals and the effect is related to the normal directions.So we concluded that the effect of the metallic mandrel should not be neglected when TCAs are used to evaluate the formation.Finally,we discuss the effect of the different normal directions on the responses of TCAs,it shows that TCAs with different normal directions have different response characters due to the formation.In conclusion,TCAs have different responses as compared with the horizontal coil antenna,and we could use the various combinations of TCAs to evaluate the formation.
【Fund】: 国家自然科学基金(11134011);; 2010年中国科学院研究生科技创新与社会实践资助专项资助
【CateGory Index】: P631.83
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