The Experimental Research Of Attenuation Distribution Law About The Induced Electrical In Secondary Field

With the quick development of the national economy, and the lack of the traditional iron resource,it is necessary to search and exploit the non-traditional iron resource. Hebei Province is rich in extremely low content magnetite. However, there is no data of searching and exploiting non-traditional iron resource and corresponding norm in China. How to find out and make full use of existing resources is an important subject.Induced polarization method has been studied more mature in direct current method, but also is a effective geophysical exploration techniques for the exploration of multi-metallic mineral and water resources. It have variety of advantages ,such as many choices of installation, provided more physical parameters, reflecting the geoelectric information-rich, but have disadvantages, too. Such as the multiple solutions of interpretation, affected by multi-factors and so on. In order to meet the market demand for do more in-depth study of induced electrical in secondary field, so that it can make more data interpretation in line with the objective reality.In this paper, using the induced polarization theory, studied the distribution of each parameter about secondary field under the conditions of different media, all-space, half-space by simulation test.First, utilize soil box simulative test method to accomplish detecting with different electrode distances in the same condition, the same electrode distance under the same conditions from a different coating thickness by induced polarization method to detect. Quantitatively obtained the conversion relations of apparent resistivity and apparent polarizability in half-space to full space conditions.Secondly, using indoor simulation test method under the same conditions to complete the detection of different electrode distance, the same electrode distance under the same conditions from a different conductive mineral content of the induced polarization method to detect. Analysis and comparison the quantitative relationship obtained with the apparent resistivity and apparent polarizability of different conductive mineral content. Discussed the exponential function relationship between attenuation of apparent polarizability in secondary field and conductivity of mineral content. Obtained that can be taken to achieve over clocking magnetite grade boundary, the exponential function coefficient should be larger than 2.31.Finally, optimizing the use of data obtained apparent metallic modulus through the indoor data processing, conducted a qualitative analysis based on inversion maps. Fitting the data obtained after extremely low content magnetite grade boundary conditions for J greater than 0.35 (1/??m). Combined with other parameters establish a discriminant model of orebody.