Lithological Characterization and Its Application Based on Three-Dimensional Structure-Coupled Joint Inversion of Gravity and Magnetic Data
Affiliation(s)
1 Key Laboratory of Geo-detection (China University of Geosciences, Beijing), Ministry of Education, Beijing, China. 2 School of Geophysics and Information Technology, China University of Geosciences, Beijing, China.
1 Key Laboratory of Geo-detection (China University of Geosciences, Beijing), Ministry of Education, Beijing, China. 2 School of Geophysics and Information Technology, China University of Geosciences, Beijing, China.
ABSTRACT
Incorporating structural-coupling constraint, known as the cross-gradients criterion, helps to improve the focussing trend in cross-plot of multiple physical properties. Based on this feature, a post-processing technique is studied to characterize the lithological types of subsurface geological materials after joint inversion. A simple domain transform, which converts two kinds of participant physical properties into an artificial complex array, is adopted to extract anomalies manually from homogenous host rock. A synthetic example shows that structure-coupled joint inverted results tend to concentrate on the feature trends in the cross-plot, and the main geological targets are recovered well by a radius-azimuth plot. In a field data example, the lithological characterization reveals that the main rock types interpreted in the study area agree with the geological information, thus demonstrating the feasibility of this technique.
Incorporating structural-coupling constraint, known as the cross-gradients criterion, helps to improve the focussing trend in cross-plot of multiple physical properties. Based on this feature, a post-processing technique is studied to characterize the lithological types of subsurface geological materials after joint inversion. A simple domain transform, which converts two kinds of participant physical properties into an artificial complex array, is adopted to extract anomalies manually from homogenous host rock. A synthetic example shows that structure-coupled joint inverted results tend to concentrate on the feature trends in the cross-plot, and the main geological targets are recovered well by a radius-azimuth plot. In a field data example, the lithological characterization reveals that the main rock types interpreted in the study area agree with the geological information, thus demonstrating the feasibility of this technique.
KEYWORDS
Lithological Characterization, Structure-Coupled Joint Inversion, Density Contrast, Magnetization
Lithological Characterization, Structure-Coupled Joint Inversion, Density Contrast, Magnetization
Cite this paper
Zhou, J. , Zhang, X. , Xiu, C. (2015) Lithological Characterization and Its Application Based on Three-Dimensional Structure-Coupled Joint Inversion of Gravity and Magnetic Data. International Journal of Geosciences, 6, 230-237. doi: 10.4236/ijg.2015.63016.
Zhou, J. , Zhang, X. , Xiu, C. (2015) Lithological Characterization and Its Application Based on Three-Dimensional Structure-Coupled Joint Inversion of Gravity and Magnetic Data. International Journal of Geosciences, 6, 230-237. doi: 10.4236/ijg.2015.63016.
References
[1] Yan, J.Y., Lü, Q.T., Chen, X.B., Qi. G., Liu, Y., Guo, D. and Chen, Y.J. (2014) 3D Lithologic Mapping Test Based on 3D Inversion of Gravity and Magnetic Data: A Case Study in Lu-Zong Ore Concentration District, Anhui Province. Acta Petrologica Sinica, 30, 1041-1053. [2] Kanasewich, E.R. and Agarwal, P.G. (1970) Analysis of Combined Gravity and Magnetic Fields in Wave Number Domain. Journal of Geophysical Research, 75, 5702-5712.
http://dx.doi.org/10.1029/JB075i029p05702 [3] Price, A. and Dransfield, M. (1995) Litholgical Mapping by Correlation of the Magnetic and Gravity Data from Corsai W.A. Exploration Geophysics, 25, 179-188. http://dx.doi.org/10.1071/EG994179 [4] Lane, R. and Guillen, A. (2005) Geologically-Inspired Constraints for a Potential Field Litho-Inversion Scheme. In: Frits, B. and Graeme, B.C., Eds., Proceedings of IAMG: GIS and Spatial Analysis. Annual Conference of the International Association for Mathematical Geology, Toronto. International Association for Mathematical Geology, Toronto, 181-186. [5] Williams, N. C. and Dipple, G. (2007) Mapping Subsurface Alteration Using Gravity and Magnetic Inversion Models. In: Milkereit, B., Ed., Proceedings of the Fifth Decennial International Conference on Mineral Exploration. Fifth Decennial International Conference on Mineral Exploration, Toronto. Prospectors and Developers Association of Canada, Toronto, 461-472. [6] Kowalczyk, P., Oldenburg, D.W., Phillips, N., Nguyen, T.H. and Thomson, V. (2010) Acquisition and Analysis of the 2007-2009 Geoscience BC Airborne Data. In: Lane, R.J., Ed., Expanded Abstracts of ASEGPESA Airborne Gravity Workshop. ASEG-PESA Airborne Gravity Workshop, Canberra. Geoscience Australia, Canberra, 115-124. [7] Infante, V., Gallardo, L.A., Montalvo-Arrieta, J.C. and de León, I.N. (2010) Lithological Classification Assisted by the Joint Inversion of Electrical and Seismic Data at a Control Site in Northeast Mexico. Journal of Applied Geophysics, 70, 93-102. http://dx.doi.org/10.1016/j.jappgeo.2009.11.003 [8] Gallardo, L.A. and Meju, M.A. (2003) Characterization of Heterogeneous Near-Surface Materials by Joint 2D Inversion of dc Resistivity and Seismic Data. Geophysical Research Letters, 30, 1658. http://dx.doi.org/10.1029/2003GL017370 [9] Gallardo, L.A. and Meju, M.A. (2004) Joint Two-Dimensional DC Resistivity and Seismic Travel Time Inversion with Cross-Gradients Constraints. Journal of Geophysical Research: Solid Earth, 109, B03311. http://dx.doi.org/10.1029/2003JB002716 [10] Li, Y. and Oldenburg, D.W. (1996) 3-D Inversion of Magnetic Data. Geophysics, 61, 394-408. http://dx.doi.org/10.1190/1.1443968 [11] Fregoso, E., Gallardo, L.A. (2009) Cross-Gradients Joint 3D Inversion with Applications to Gravity and Magnetic Data. Geophysics, 74, L31-L42. http://dx.doi.org/10.1190/1.3119263
[1] Yan, J.Y., Lü, Q.T., Chen, X.B., Qi. G., Liu, Y., Guo, D. and Chen, Y.J. (2014) 3D Lithologic Mapping Test Based on 3D Inversion of Gravity and Magnetic Data: A Case Study in Lu-Zong Ore Concentration District, Anhui Province. Acta Petrologica Sinica, 30, 1041-1053. [2] Kanasewich, E.R. and Agarwal, P.G. (1970) Analysis of Combined Gravity and Magnetic Fields in Wave Number Domain. Journal of Geophysical Research, 75, 5702-5712.
http://dx.doi.org/10.1029/JB075i029p05702 [3] Price, A. and Dransfield, M. (1995) Litholgical Mapping by Correlation of the Magnetic and Gravity Data from Corsai W.A. Exploration Geophysics, 25, 179-188. http://dx.doi.org/10.1071/EG994179 [4] Lane, R. and Guillen, A. (2005) Geologically-Inspired Constraints for a Potential Field Litho-Inversion Scheme. In: Frits, B. and Graeme, B.C., Eds., Proceedings of IAMG: GIS and Spatial Analysis. Annual Conference of the International Association for Mathematical Geology, Toronto. International Association for Mathematical Geology, Toronto, 181-186. [5] Williams, N. C. and Dipple, G. (2007) Mapping Subsurface Alteration Using Gravity and Magnetic Inversion Models. In: Milkereit, B., Ed., Proceedings of the Fifth Decennial International Conference on Mineral Exploration. Fifth Decennial International Conference on Mineral Exploration, Toronto. Prospectors and Developers Association of Canada, Toronto, 461-472. [6] Kowalczyk, P., Oldenburg, D.W., Phillips, N., Nguyen, T.H. and Thomson, V. (2010) Acquisition and Analysis of the 2007-2009 Geoscience BC Airborne Data. In: Lane, R.J., Ed., Expanded Abstracts of ASEGPESA Airborne Gravity Workshop. ASEG-PESA Airborne Gravity Workshop, Canberra. Geoscience Australia, Canberra, 115-124. [7] Infante, V., Gallardo, L.A., Montalvo-Arrieta, J.C. and de León, I.N. (2010) Lithological Classification Assisted by the Joint Inversion of Electrical and Seismic Data at a Control Site in Northeast Mexico. Journal of Applied Geophysics, 70, 93-102. http://dx.doi.org/10.1016/j.jappgeo.2009.11.003 [8] Gallardo, L.A. and Meju, M.A. (2003) Characterization of Heterogeneous Near-Surface Materials by Joint 2D Inversion of dc Resistivity and Seismic Data. Geophysical Research Letters, 30, 1658. http://dx.doi.org/10.1029/2003GL017370 [9] Gallardo, L.A. and Meju, M.A. (2004) Joint Two-Dimensional DC Resistivity and Seismic Travel Time Inversion with Cross-Gradients Constraints. Journal of Geophysical Research: Solid Earth, 109, B03311. http://dx.doi.org/10.1029/2003JB002716 [10] Li, Y. and Oldenburg, D.W. (1996) 3-D Inversion of Magnetic Data. Geophysics, 61, 394-408. http://dx.doi.org/10.1190/1.1443968 [11] Fregoso, E., Gallardo, L.A. (2009) Cross-Gradients Joint 3D Inversion with Applications to Gravity and Magnetic Data. Geophysics, 74, L31-L42. http://dx.doi.org/10.1190/1.3119263