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Method for reducing non-uniqueness of electromagnetic sounding inversion result

An electromagnetic bathymetry and inversion technology, applied in the field of geophysical exploration, can solve problems such as unsatisfactory results, and achieve the effect of reducing non-uniqueness

Active Publication Date: 2015-03-18
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0003] However, no matter it is 2D inversion or 3D inversion, even if the fitting error is very small, the obtained inversion results are often not completely consistent with the actual underground electrical structure. The reason is due to the non-uniqueness of geophysical inversion. The result is that the geophysical measurement data has multiple models corresponding to it, and the non-uniqueness of electromagnetic sounding inversion is unavoidable
[0004] How to reduce the non-uniqueness of inversion results has always been the direction of efforts of geophysicists, among which the optimization of inversion algorithms is the most researched, but the results are not completely satisfactory
This has always been the reason why the results of electromagnetic sounding inversion are difficult to meet the actual production needs

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[0029] The present invention will be described in detail below in conjunction with accompanying drawings and examples.

[0030] The specific method steps of the model optimization method for multiple inversion results are as follows:

[0031] 1) Collect the electromagnetic sounding data in the exploration area, and do the following five inversions for each survey line: ① 2D Occam inversion, ② 2D rapid relaxation (RRI) inversion, ③ 2D conjugate gradient inversion ④ 2D visual model inversion, ⑤ 2D generalized inverse inversion, at least 5 2D inversion depth-resistivity models were obtained;

[0032] 2) Regularize the five 2D inversion depth-resistivity models in step 1), and obtain the inversion results of 5 regularized 2D depth-resistivity models;

[0033] The regularization process is to perform interpolation processing on the five two-dimensional inversion depth-resistivity models obtained in step 1) from the surface to the underground depth range, according to the same dept...

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Abstract

The invention discloses a method for reducing the non-uniqueness of an electromagnetic sounding inversion result. The method comprises the following steps: acquiring the electromagnetic sounding data of an exploration area to obtain at least over two two-dimensional inversion depth-resistivity models; performing regularization to obtain regularized two-dimensional depth-resistivity model inversion results; determining a learning sample and a target sample; establishing a BP (Back Propagation) neural network system; inputting the inner section of the area into a neural network in sequence point after point and depth point after depth point to obtain the desired prediction results of each measuring point and each depth point; reducing the prediction results into a real inversion resistivity value to obtain an optimized two-dimensional inversion result. According to the processing method for rapidly optimizing the inversion non-uniqueness of electromagnetic sounding data, neural network processing is performed on a plurality of inversion results, and known information is learned, so that the non-uniqueness is reduced, and the method is practical and effective for obtaining a real model of a complex area target body.

Description

technical field [0001] The invention relates to a geophysical prospecting method, which is an electromagnetic prospecting data processing technology, in particular a method for reducing the non-uniqueness of electromagnetic sounding inversion results. Background technique [0002] Electromagnetic sounding is a geophysical exploration method to understand the change of the resistivity of the underground medium by observing the change of the electromagnetic field on the ground. In recent years, with the rapid development of theoretical research and computer technology, inversion methods for converting collected frequency-resistivity data into depth-resistivity data emerge in endlessly, such as 2D layered model inversion, 2D continuum inversion, and even 3D inversion. The calculation method has gradually matured, the calculation speed has been greatly improved, and the underground geoelectric model can be obtained relatively quickly, so that the electromagnetic sounding method ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
Inventor 何展翔王永涛陶德强
Owner BC P INC CHINA NAT PETROLEUM CORP
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