ArticleName |
Some techniques for interpreting magnetic
field in complex environments |
ArticleAuthorData |
Tel Aviv University, Tel Aviv, Israel^{1} ; Azerbaijan State Oil and Industry University, Baku, Azerbaijan^{2}
L. V. Eppelbaum^{1,2}, Professor, Doctor of Sciences, leppelbaum@gmail.com |
Abstract |
With the rapid development of aeromagnetic (primarily unmanned) methods for measuring the magnetic field, the possibility of detailed magnetic research in hard-toreach mountainous areas, forested areas, swamp areas, desert areas and water areas has emerged. Analysis of the magnetic field is most complicated by the influence of the vector nature of the magnetic properties of rocks, the extensive range of their properties, and by the presence of residual magnetization. The article reveals several nonstandard features of magnetic exploration data processing (analysis of secondary variations of magnetic fields, correlation with terrain influence, estimate of magnetization intensity in the top cross section) and subsequent interpretation under challenging conditions. The physical and geological conditions of the area of Azerbaijan are characterized by rugged terrain, inclined magnetization (~58o), and complex geological environments. Here, deterministic methods for solving inverse and direct problems of geophysics are of great importance as they make it possible to analyze magnetic anomalies from individual bodies of relatively simple shape and identify relatively extended reference boundaries. A brief review of the existing methods to solve inverse problems in geomagnetics is given. The examples covered in the article include a block diagram of various types of interference, a shallow reservoir interpretive model, a medium-scale quantitative interpretation at the Bolshoi Somalit site (southern Greater Caucasus, Azerbaijan), and 3D magnetic field modeling at the Gyzylbulag gold deposit in the Azerbaijani part of the Lesser Caucasus. |
References |
1. Eppelbaum L. V. Geophysical Potential Fields: Geological and Environmental Applications. Amsterdam : Elsevier, 2019. Vol. 2. 467 p. 2. Zolotaya L. A., Filippovich A. V., Kosnyreva M. V., Palenov A. Yu. Prospects for multilevel magnetic surveying in Mountainous Crimea. GeoSochi-2023—Current Problems of Geology and Geophysics : International Conference Proceedings. Sochi, 2023. pp. 109–112. 3. Ermokhin K. M. Difficulties in interpretation of magnetic anomalies and the way to overcome them. Geoinformatika. 2018. No. 2. pp. 27–31. 4. Khesin B. E., Alexeyev V. V., Eppelbaum L. V. Interpretation of Geophysical Fields in Complicated Environments. Ser.: Modern Approaches in Geophysics. Dordrecht : Springer, 1996. 353 p. 5. Eppelbaum L. V. Study of magnetic anomalies over archaeological targets in urban environments. Physics and Chemistry of the Earth, Parts A/B/C. 2011. Vol. 36, Iss. 16. pp. 1318–1330. 6. Logachev A. A., Zakharov V. P. Geomagnetics : Textbook. 5^{th} revised and enlarged edition. Leningrad : Nedra, 1979. 351 p. 7. Nikitskiy V. E., Vasyutochkin G. S., Lomanyi V. D. et al. Geomagnetics : Geophysicist’s Manual. 2^{nd} revised and enlarged edition. Moscow : Nedra, 1990. 471 p. 8. Parasnis D. S. Principles of Applied Geophysics. 5th ed. London : Chapman & Hall, 1997. 429 p. 9. Telford W. M., Geldart L. P., Sheriff R. E. Applied Geophysics. 2^{nd} ed. Cambridge : Cambridge University Press, 2004. 770 p. 10. Isles G. J., Rankin L. R. Geological Interpretation of Aeromagnetic Data. Collingwood : CSIRO Publishing, 2013. 357 p. 11. Hato T., Tsukamoto A., Adachi S., Oshikubo Y., Watanabe H. et al. Development of HTS-SQUID magnetometer system with high slew rate for exploration of mineral resources. Superconductor Science and Technology. 2013. Vol. 26, No. 11. ID 115003. 12. Gvishiani A., Soloviev A. Observations, Modeling and Systems Analysis in Geomagnetic Data Interpretation. Cham : Springer, 2020. 311 p. 13. Reford M. S., Sumner J. S. Aeromagnetics. Geophysics. 1964. Vol. 29, Iss. 4. pp. 482–516. 14. Rao D. A., Babu H. V. R. On the half‐slope and straight‐slope methods of basement depth determination. Geophysics. 1984. Vol. 49, Iss. 8. pp. 1365–1368. 15. Roest W. R., Verhoef J., Pilkington M. Magnetic interpretation using the 3-D analytic signal. Geophysics. 1992. Vol. 57, Iss. 1. pp. 116–125. 16. Blakely R. J. Potential Theory in Gravity and Magnetic Applications. Cambridge : Cambridge University Press, 1995. 441 p. 17. Desvignes G., Tabbagh A., Benech C. The determination of the depth of magnetic anomaly sources. Archaeological Prospection. 1999. Vol. 6, Iss. 2. pp. 85–105. 18. Li J., Zhang Y., Fan H., Li Z., Liu M. Estimating the location of magnetic sources using magnetic gradient tensor data. Exploration Geophysics. 2019. Vol. 50, Iss. 6. pp. 600–612. 19. Dwivedi D., Chamoli A. Source edge detection of potential field data using wavelet decomposition. Pure and Applied Geophysics. 2021. Vol. 178, Iss. 3. pp. 919–938. 20. Ibraheem I. M., Tezkan B., Ghazala H., Othman A. A. A new edge enhancement filter for the interpretation of magnetic field data. Pure and Applied Geophysics. 2023. Vol. 180, Iss. 6. pp. 2223–2240. 21. Dolgal A. S. New mathematical ways of representing results of quantitative interpretation of geopotential fields. Gornoe ekho. 2021. No. 1(82). pp. 83–90. 22. Balk P. I., Dolgal A. S. History of development and current status of the finite element approach in the theory of interpretation of gravitational and magnetic anomalies. Vestnik KRAUNTs. Nauki o Zemle. 2022. Vol. 56, No. 4. pp. 19–40. 23. Balk P. I., Dolgal A. S. Additive methods of solving inverse problems in gravity survey and geomagnetics. Moscow : Nauchnyi mir, 2020. 455 p. 24. Eppelbaum L. V. Quantitative interpretation of magnetic anomalies from bodies approximated by thick bed models in complex environments. Environmental Earth Sciences. 2015. Vol. 74, No. 7. pp. 5971–5988. |