2D Inversion of magnetic and gravity data: a case study on Golgohar mine

Document Type : Research Paper

Authors

1 Faculty of Mining, Petroleum &Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran.

2 Institute of Geophysics University of Tehran, Tehran, Iran.

Abstract

Because of the limitations of manipulating single geophysical data sets to interpret subsurface anomalies for many cases, it is required to combine geophysical data in order to decrease the ambiguity and non-uniqueness of the interpretation. Integration interpretation of two different geophysical data sets is one of the most common ways to integrate geophysical data and in this paper we want to utilize the combination of gravity and magnetic data for the Golgohar mine in Iran. This mining case is located in the Sanandaj-Sirjan zone in the province of Kerman. Gravity and magnetic data are interpreted using a MATLAB code written based on the damped weighted minimum length solution for which the model weighting is the product of the multiplying of compactness and depth weighting constraints. At first the inversion algorithm is applied on the synthetic case to investigate its reliability for practical application on the real data. Reconstructed models from the noise contaminated synthetic data are suggestive of productivity of the inversion algorithm. Ultimately, the algorithm is applied for the interpretation of the real data and the inversion results of both data sets shows a high correlation about the magnetite anomaly position horizontally and vertically. The results represent an anomaly with the depth ranges approximately from 25 to 130 m with horizontal extension of about 120 m from 280 to 400 m relative to the start of the interested profile.

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