Three-dimensional gravity inversion using co-kriging stochastic algorithm; application of the method on the gravity data from Safoo mine site

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Khaleghi Yalegonbadi Mansoureh; EBRAHIMZADEH ARDESTANI VAHID

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Journal: JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS Year:2017 | Volume:3 | Issue:1 Page(s): 87-97

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Title

Three-dimensional gravity inversion using co-kriging stochastic algorithm; application of the method on the gravity data from Safoo mine site

Author(s)

Khaleghi Yalegonbadi Mansoureh | EBRAHIMZADEH ARDESTANI VAHID | Issue Writer Certificate

Keywords

Gravimetry

3D Inversion

Co-Kriging

Geostatistics

Variogram

Safoo Mine

Abstract

In this paper, 3D Inversion of gravity data for determination of subsurface density distribution is made using geostatistical Co-Kriging method. Co-Kriging is a mathematical interpolation and extrapolation tool. It uses the spatial correlation between the secondary variables and a primary variable to improve the estimation of the primary variable at un-sampled locations. The Co-Kriging method gives weights to the data so as to minimize the estimation variance (the Co-Kriging variance). In this paper, the primary variable is density, (estimated by ρ *) and the secondary variable is gravity g. For determination of kernel matrix, the subsurface area is divided into large number of rectangular blocks of known sizes and positions. The unknown density contrast of each prism is the parameter that should be estimated. In addition, the weighting matrix has also been used in order to improve the depth resolution. Preconditioned conjugate gradient method has been used for inversion. The computer program has been written in MATLAB and tested on synthetic gravity of a rectangular prism model. The results indicate that the geometry and density of the reconstructed model are close to those of the original model. The gravity data acquired in an area, which includes concealed manganese ore bodies (Safoo mine site), in northwest of Iran. The results show a density distribution in the subsurface from the depth of about 5 to 35-40 m. These results are in good agreement with the results of the borehole drilled in the site.

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APA: Copy

Khaleghi Yalegonbadi, Mansoureh, & EBRAHIMZADEH ARDESTANI, VAHID. (2017). Three-dimensional gravity inversion using co-kriging stochastic algorithm; application of the method on the gravity data from Safoo mine site. JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS, 3(1 ), 87-97. SID. https://sid.ir/paper/268601/en

Vancouver: Copy

Khaleghi Yalegonbadi Mansoureh, EBRAHIMZADEH ARDESTANI VAHID. Three-dimensional gravity inversion using co-kriging stochastic algorithm; application of the method on the gravity data from Safoo mine site. JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS[Internet]. 2017;3(1 ):87-97. Available from: https://sid.ir/paper/268601/en

IEEE: Copy

Mansoureh Khaleghi Yalegonbadi, and VAHID EBRAHIMZADEH ARDESTANI, “Three-dimensional gravity inversion using co-kriging stochastic algorithm; application of the method on the gravity data from Safoo mine site,” JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS, vol. 3, no. 1 , pp. 87–97, 2017, [Online]. Available: https://sid.ir/paper/268601/en

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