3D resistivity cascaded automatic imaging method

Abstract

This invention relates to earth physical exploring technique, which is of large earth electrical magnetic exploring data 3D resistance automatic imaging method, which comprises the following steps: using regular electrical magnetic exploring method to test and record area data; adopting the exploring two electrodes direction resistance rate and phase curve for insert value and induce with each image result as next reduce base near to aim object structure imaging.

Description

technical field [0001] The invention relates to geophysical prospecting technology, and relates to a three-dimensional resistivity cascade automatic imaging method for processing magnetotelluric prospecting data. Background technique [0002] The development of traditional magnetotelluric prospecting data processing and imaging technology has gone through several stages. At first, it could only make some qualitative explanations. According to the bathymetry curve, the general uplift and depression pattern of the basin was understood. Later, a one-dimensional and semi-quantitative inversion of Bostic (BOSTIC for short) inversion method can understand the general change of longitudinal electrical properties, and later developed one-dimensional layered medium inversion and one-dimensional continuous medium inversion, etc., the layering accuracy has been improved, but the initial model needs to be input, and the inversion There are equivalence and multi-solutions in the inversio...

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Problems solved by technology

[0002] The development of traditional magnetotelluric prospecting data processing and imaging technology has gone through several stages. At first, it could only make some qualitative explanations. According to the bathymetry curve, the general uplift and depression pattern of the basin was understood. Later, a one-dimensional and semi-quantitative inversion of Bostic (BOSTIC for short) inversion method can understand the general change of longitudinal electrical properties, and later developed one-dimensional layered medium inversion and one-dimensional continuous medium inversion, etc., the layering accuracy has been improved, but the initial model needs to be input, and the inversion There are equivalence and multi-solutions in the inversion, especially in the case of non-layered ground, the inversion results may even lead to erroneous geological understanding; after 1990, the two-dimensional inversion imaging method developed rapidly, such as the commonly used two-dimensional inversion The inversion methods include Occam (abbreviated as Occam) inversion, rapid relaxation method (abbreviated as RRI) inversion and many other inversion methods, which have greatly improved the imaging effect of magnetotelluric inversion, but the two-dimensional simulation is compared with the actual ground The electrical model is still an approximate result, and it is impossible to describe the geoelectric model objectively, and the equivalence and multi-solution are still serious. It is characterized by inversion calculation speed blocks and less computer resources

In recent years, 3D inversion has also developed rapidly, but because accurate simulation is not yet practical, computer memory and speed are difficult to meet production needs

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