3-D DIPON INVERSION METHOD FOR NONLINEAR CONJUGATE GRADIENT OF MAGNETOTEURUS

Abstract

The invention provides a three-dimensional magnetotelluric tipper inversion method using nonlinear conjugate gradients and belongs to the technical field of magnetotelluric sounding. The method comprises steps as follows: S1, inputting data and performing ranking; S2, distributing the parameter of each frequency point to all cpus for tipper inversion and computing; S3, stopping parallel computing and combining the data, and comparing the difference between an invention result and the input date; S4, distributing the data difference and the parameter of each frequency point to all cpus for parallel computing of objective function gradients, computing the search direction p and the step length a and accordingly obtaining a model modification amount; S5, updating a module according to the model modification amount and stopping iteration when an objective function is one hour enough, otherwise, using a new model to repeat the steps from S2 to S5. According to the inversion method, tipper three-dimensional inversion is realized on the basis of tipper data by introducing a nonlinear conjugate gradient method, and the invention result approaches to real underground three-dimensional electrical structure information greatly; the method adopts a parallel computing structure, and the computing efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of magnetotelluric sounding, in particular to a three-dimensional inversion method of magnetotelluric field nonlinear conjugate gradient. Background technique [0002] The magnetotelluric sounding method is widely used in deep geological exploration and exploration of minerals, water, oil, geothermal and other resources. At present, two-dimensional inversion is the mainstream method for data interpretation, and there are few studies on three-dimensional inversion methods. For impedance data, foreign scientists have proposed methods such as fast relaxation method and conjugate gradient method. There is less research. [0003] In the modern geophysical method of exploration using the natural electromagnetic field, there are mainly two methods for collecting the vertical magnetic field component: (1) The magnetotelluric sounding method (MTS) that simultaneously collects the electric field and magnetic field si...

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Problems solved by technology

[0015] However, the above algorithm has the following defects and deficiencies: (1) the calculation efficiency is relatively slow

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