
Application of several potential field separation methods of gravity data in Vientiane of Laos area
LI Zhaohui, ZHAO Qiang, WU Yangang, YANG Changbao, ZHAO Guoxing, XING Congcong
Global Geology ›› 2017, Vol. 20 ›› Issue (2) : 89-97.
Application of several potential field separation methods of gravity data in Vientiane of Laos area
Gravity data observed in geophysical surveys are the sum of potential field produced by all underground inhomogeneous geological sources with different scales, different patterns and different depths. The aim of gravity exploration is mainly to extract the meaningful local anomaly from the regional gravity anomaly which is helpful to detect the deep structure and delineate the favorable area for mineral prospecting. In this paper, several anomaly separation methods are theoretically discussed, including trend analysis method, finite element method, interpolating cut method and analytic continuation method. And, these methods are applied to achieve the delineation of potash-mine deposit in Vientiane. Through experiments, analysis and comparison, the separating result of upward continuation is shown to be satisfactory, for that can separate the ore body anomaly from the background field more effectively. Further, with the combination of the geological information and gravity anomaly, it infers four rich potash zones in the study area of Vientiane which is significant for future geological work.
gravity anomaly / anomaly separation / potash mine / Vientiane area
Agocs W B. 1951. Least-squares residual anomaly determination. Geophysics, 16(4): 686-696.
Abdelrahman E M, Bayoumi A I, El-Araby H M, et al. 1991. A least-squares minimization approach to invert gravity data. Geophysics, 56(1): 115-118.
Coggon J. 1971. Electromagnetic and electrical modeling by the finite element method. Geophysics, 36(1):132-155.
Duan B C, Xu S Z, Yan H J, et al. 1998. Application of interpolation-cut method for magnetic anomaly division to igneous mass investigation. Oil Geophysical Prospecting, 33(1):125-131. (in Chinese with English abstract.)
Li L, Wu Y G, Yang C B. 2014. Several boundary identification methods of gravity data and application in Vientiane of Laos area. Global Geology, 17(1): 55-61.
Liu Y, Yan J Y, Wu M A, et al. 2012. Exploring deep concealed ore bodies based on gravity anomaly separation methods: A case study of the Nihe iron deposit. Chinese Journal of Geophysics, 55(12): 4181-4193. (in Chinese with English abstract.)
Mallick K., Sharma K K. 1999. A finite element method for computation of the regional gravity anomaly. Geophysics, 64(2):461-469.
Paul M K. 1967. A method of computing residual anomalies from Bouguer gravity map by applying relaxation technique. Geophysics, 32(4): 708-719.
Peters L J. 1949. The direct approach to magnetic interpretation and its practical application. Geophysics, 14(3): 290-320.
Simpson S M Jr. 1954. Least squares polynomial fitting to gravitational data and density plotting by digital computers. Geophysics, 19(2): 255-269.
Skeels D C. 1967. What is residual gravity. Geophysics, 32(5): 872-876.
Tong Y C. 1984. A method of extracting local anomaly of gravity-asynchronous iterative method with 9-point difference scheme. Geology and Prospecting, (12): 51-58. (in Chinese.)
Wang S L, Ning S N, Li C, et al. 1993. 3D trend analysis application to the dissociation of potential field anomaly. Coal Geology and Exploration, 21(5): 60-64. (in Chinese with English abstract.)
Wen B H, Cheng F D. 1990. A new interpolating cut method for identifying regional and local fields of magnetic anomaly. Journal of Central South Mining and Metallurgy Institute, 21(3): 229-235. (in Chinese with English abstract.)
Wang B. 2006. 2D and 3D potential-field upward continuation using splines. Geophysics, 54(2): 199-209.
Wang B Z, Xu S Z, Liu B H, et al. 1997. An example of aeromagnetic anomaly separation using multi-interpolation division. Oil Geophysical Prospecting, 32(3): 431-438. (in Chinese with English abstract.)
Xing Y. 2008. Research in the method of separating anomalous gravity and magnetic data: master's degree thesis. Beijing: China University of Geosciences. (in Chinese with English abstract.)
Yang C H. 2005. The application of the sieving-trend analysis method to separating regional anomaly from local anomaly. Geophysical and Geochemical Exploration, 29(2):167-170. (In Chinese with English abstract.)
Zeng H L. 1982. Discussion on effectiveness of some methods for gravity and magnetic data processing. Geophysical and Geochemical Exploration, 6(5): 257-264. (in Chinese.)
Zeng H L, Xu D S. 2002. Estimation of optimum upward continuation height. Earth Science Frontiers, 9(2): 499-503. (in Chinese with English abstract.)
/
〈 |
|
〉 |