Analysis of polarization of dipole modes in non-circular boreholes in anisotropic formation
The problem of determination of principle axes in anisotropic formation in non-circular boreholes is studied with numerical simulation of acoustic logging measurements. The processing algorithms for acoustic logging data used in practice involve propagation of two orthogonally polarized waves along...
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Sergo Ordzhonikidze Russian State University for Geological Prospecting
2015-10-01
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| Series: | Известия высших учебных заведений: Геология и разведка |
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| Online Access: | https://www.geology-mgri.ru/jour/article/view/73 |
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| author | G. S. Shchelik |
| author_facet | G. S. Shchelik |
| author_sort | G. S. Shchelik |
| collection | DOAJ |
| description | The problem of determination of principle axes in anisotropic formation in non-circular boreholes is studied with numerical simulation of acoustic logging measurements. The processing algorithms for acoustic logging data used in practice involve propagation of two orthogonally polarized waves along borehole axis that correspond to dipole modes. However, the oscillation directions of dipole modes in elliptical boreholes are shown to be substantially non-orthogonal and depend on frequency spectrum of the source signal. This leads to incorrect determination of principle directions in the considered transversely-isotropic media. The results for principle directions obtained after processing are compared with eigenvectors for dipole modes calculated independently with semi-analytical finite element method (SAFE). The application of frequency filters and «non-orthogonal» processing algorithms is proved to be effective for validation and accuracy improvement of the obtained directions. |
| format | Article |
| id | doaj-art-1b41f25d476c448d9cb8f17a6ee49cad |
| institution | Matheson Library |
| issn | 0016-7762 2618-8708 |
| language | Russian |
| publishDate | 2015-10-01 |
| publisher | Sergo Ordzhonikidze Russian State University for Geological Prospecting |
| record_format | Article |
| series | Известия высших учебных заведений: Геология и разведка |
| spelling | doaj-art-1b41f25d476c448d9cb8f17a6ee49cad2025-08-03T13:09:34ZrusSergo Ordzhonikidze Russian State University for Geological ProspectingИзвестия высших учебных заведений: Геология и разведка0016-77622618-87082015-10-0105525910.32454/0016-7762-2015-5-52-5973Analysis of polarization of dipole modes in non-circular boreholes in anisotropic formationG. S. Shchelik0Moscow Institute of Physics and Technology; Schlumberger Moscow ResearchThe problem of determination of principle axes in anisotropic formation in non-circular boreholes is studied with numerical simulation of acoustic logging measurements. The processing algorithms for acoustic logging data used in practice involve propagation of two orthogonally polarized waves along borehole axis that correspond to dipole modes. However, the oscillation directions of dipole modes in elliptical boreholes are shown to be substantially non-orthogonal and depend on frequency spectrum of the source signal. This leads to incorrect determination of principle directions in the considered transversely-isotropic media. The results for principle directions obtained after processing are compared with eigenvectors for dipole modes calculated independently with semi-analytical finite element method (SAFE). The application of frequency filters and «non-orthogonal» processing algorithms is proved to be effective for validation and accuracy improvement of the obtained directions.https://www.geology-mgri.ru/jour/article/view/73alford rotationacoustic loggingelliptical boreholeanisotropyalford rotation |
| spellingShingle | G. S. Shchelik Analysis of polarization of dipole modes in non-circular boreholes in anisotropic formation Известия высших учебных заведений: Геология и разведка alford rotation acoustic logging elliptical borehole anisotropy alford rotation |
| title | Analysis of polarization of dipole modes in non-circular boreholes in anisotropic formation |
| title_full | Analysis of polarization of dipole modes in non-circular boreholes in anisotropic formation |
| title_fullStr | Analysis of polarization of dipole modes in non-circular boreholes in anisotropic formation |
| title_full_unstemmed | Analysis of polarization of dipole modes in non-circular boreholes in anisotropic formation |
| title_short | Analysis of polarization of dipole modes in non-circular boreholes in anisotropic formation |
| title_sort | analysis of polarization of dipole modes in non circular boreholes in anisotropic formation |
| topic | alford rotation acoustic logging elliptical borehole anisotropy alford rotation |
| url | https://www.geology-mgri.ru/jour/article/view/73 |
| work_keys_str_mv | AT gsshchelik analysisofpolarizationofdipolemodesinnoncircularboreholesinanisotropicformation |