In recent years, with the implementation of three-dimensional deep geological mapping and shale gas bearing basin prospective evaluation, magnetotelluric method, as one of geophysical methods, has become more and more important. There are a finite number of challenging problems in magnetotelluric data processing and interpretation such as impedance tensor rotation, TE and TM mode identification, static distortion correction, and selection of TE and TM for 2D inversion. Based on magnetotelluric module in WinGlink software, the authors adopted five impedance tensor rotation methods and three curve smoothing methods to process the magnetotelluric data gathered in Jarud Banner, Inner Mongolia. Three stations with different qualities in one profile were chosen to process. The results of five rotation methods and three smoothing methods were analyzed and assessed. Polar diagram analysis of three stations showed that the geological models under themselves were three-dimensional. The comparative study is critical for three-dimensional geological models, and is especially much instructive to the processing and interpretation of magnetotelluric data by using WingGlink software.
赵维俊, 孙中任. 大地电磁阻抗张量旋转方法和曲线圆滑方法的比较[J]. 物探与化探, 2013, 37(6): 1125-1132.
ZHAO Wei-jun, SUN Zhong-ren. A COMPARATIVE STUDY OF MAGNETOTELLURIC IMPEDANCE TENSOR ROTATION AND CURVE SMOOTHING METHODS. Geophysical and Geochemical Exploration, 2013, 37(6): 1125-1132.
[1] Simpson F, Bahr K. Practical magnetotellurics[M].Cambridge University Press, 2005.[2] Berdichevsky M N, Dmitriev V I. Models and methods of magnetotellurics[M].Springer Press, 2008.[3] Vozoff K. The magnetotelluric method in the exploration of sedimentary basins[J].Geophysics, 1972, 37 (1) :98-141.[4] Livelybrooks D, Mareschal M, Blais E, et al. Magnetotelluric delineation of the Trillabelle massive sulfide body in Sudbury, Ontario[J].Geophysics, 1996, 61 (4) :971-986.[5] Stanley W D, Boehl J E, Bostick F X, et al. Geothermal significance of magnetotelluric sounding in the Eastern Snake River Plain-Yellowstone Region[J].Journal of Geophysical Research, 1977, 82 (17) :2501-2514.[6] 陈小斌, 赵国泽, 马宵.关于MT二维反演中数据旋转方向的选择问题初探[J].石油地球物理勘探, 2008, 43 (1) :113-128.[7] 蔡军涛, 陈小斌.大地电磁资料精细处理和二维反演解释技术研究 (二) :反演数据极化模式选择[J].地球物理学报, 2010, 53 (11) :2703-2714.[8] 贺春艳, 郭秋峰.应用Winglink进行大地电磁测深极化模式识别的研究[G]//山东地球物理六十年.青岛:中国海洋大学出版社, 2010:557-564.[9] Christopherson K R, Jones A, Mackie R. Magnetotellurics for natural resources from acquisition through interpretation[M].SEG publishing, 2002.[10] Bahr K. Interpretation of the magnetotelluric impedance tensor: regional induction and local telluric distortion[J].Journal of Geophysics, 1988, 62:119-127.[11] Bahr K. Geological noise in magnetotelluric data: a classification of distortion type[J].Physics of Earth planet interior, 1991, 66:24-38.[12] Pracser E, Szarka L. A correction to Bahr's"phase deviation" method for tensor decomposition[J].Earth Planets Space, 1999, 51:1019-1022.[13] Groom R W, Bailey R C. Decomposition of magnetotelluric impedance tensor in the presence of local three-dimensional galvanic distortion[J].Journal of Geophysical Research, 1989, 94 (B2) :1913-1925.[14] Groom R W, Bailey R C. Analytic investigations of the effects of near-surface three-dimensional galvanic scatterers on MT tensor decompositions[J].Geophysics, 1991, 56 (4) :496-518.[15] Mati A, Queralt P, Joes A G, et al.Improving Bahr's invariant parameters using the WAL approach[J].Geophysical Journal International, 2005, 163 (1) :38-41.[16] Marti A, Queralt P, Ledo J. WALDIM: A code for the dimensionality analysis of magnetotelluric data using the rotational invariant of the Magnetotellurics[J].Computers and Geosciences, 2009, 35:2295-2303.[17] Utada H, Munekane H. On galvanic distortion of regional three-dimensional magnetotelluric impedance[J].Geophysical Journal International, 2000, 140 (2) :385-398.[18] Caldwell T G, Bibby H M, Brown C. The magnetotelluric phase tensor[J].Geophysical Journal International, 2004, 158 (2) :457-469.[19] 蔡军涛, 陈小斌, 赵国泽.大地电磁资料精细处理和二维反演解释技术研究 (一) :阻抗张量分解与构造维性分析[J].地球物理学报, 2010, 53 (10) :2516-2526.[20] MT/EMAP Data Interchange Standard[S].SEG publishing, 1991.[21] LaTorraca G A, Madden T R, Korringa J. An analysis of the magnetotelluric impedance for three-dimensional conductivity structures[J].Geophysics, 1986, 51 (9) : 1819-1829.[22] Sutarrno D, Vozoff K. Phase-smoothed robust M-estimation of magnetotelluric impedance functions[J].Geophysics, 1991, 56 (12) :1999-2007.[23] Parker R L. The inverse problem of electromagnetic induction: existence and construction of solutions based on incomplete data[J].Journal of Geophysical Research, 1980, 85 (B8) :4421-4428.[24] Beamish D, Travassos J M. The study of D+ solution in magnetotelluric interpretation[J].Journal of Applied Geophysics, 1992, 29 (1) :1-19.[25] Press W H, Teukolsky S A, Vetterling W T, et al. Numerical recipes in C++: the art of scientific computing[M].Cambridge University Press, 2002.[26] Park S K, Biasi G P, Mackie R L, et al. Magnetotelluric evidence for crustal suture zones bounding the southern Great Valley, California[J].Journal of Geophysical Research, 1991, 96 (B1) :353-376.
