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

A conjugate gradient and non-linear technology, applied in the fields of electrical/magnetic exploration, geophysical measurement, electrical digital data processing, etc., can solve the problems of slow calculation efficiency and achieve the effect of reliable information and high calculation efficiency

Active Publication Date: 2018-04-20
INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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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

Method used

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

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Embodiment Construction

[0037] The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:

[0038] Such as figure 1 As shown, a 3D inversion method of magnetotelluric nonlinear conjugate gradient includes the following steps: establishing a 3D inversion objective function based on inclination data, introducing a nonlinear conjugate gradient method, solving the gradient of the objective function, and finding the direction and step size, the 3D inversion results are obtained by modifying the model; a parallel computing structure based on frequency points is added to the calculation.

[0039] Specifically include the following steps:

[0040] S1, input inversion parameters, initial model parameters, data and error parameters and sort the data;

[0041] S2, according to the number of CPUs of the application computer, the parameters of each frequency point are automatically assigned to all CPUs to perform parallel calculation of the tilt forwa...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00G01V3/40
Inventor 张昆董浩严加永唐宝山
Owner INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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