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Method for building and judging three-dimensional strip-shaped random fault zone model in aviation time domain

A technology of time-domain electromagnetics and discriminant methods, which is applied in the fields of electric/magnetic exploration, radio wave measurement system, sound wave re-radiation, etc., can solve problems such as blank research areas, and does not consider the establishment of strip-shaped random fault zones, etc., to achieve improved Accuracy and reliability, reduced exploration costs, and improved efficiency

Active Publication Date: 2018-05-04
JILIN UNIV
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Problems solved by technology

[0008] At present, most of the research on random fault zones is aimed at the fields of ground penetrating radar, earthquake and controlled source electromagnetic detection, but none of them consider the establishment of strip random fault zones, and the identification of fault zones by airborne time-domain electromagnetic method leads to a gap in this research field.

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  • Method for building and judging three-dimensional strip-shaped random fault zone model in aviation time domain
  • Method for building and judging three-dimensional strip-shaped random fault zone model in aviation time domain
  • Method for building and judging three-dimensional strip-shaped random fault zone model in aviation time domain

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Embodiment Construction

[0043] see Figure 1 to Figure 18 Shown:

[0044] The airborne time-domain electromagnetic three-dimensional strip random fault zone model establishment and discrimination method provided by the present invention are as follows:

[0045] Step 1, using Yee grid to divide the earth model into a grid;

[0046] Such as image 3 , Figure 4 As shown, in Step 1, the Yee grid is used to discretize the earth model into 175×175×78 grids. The electric field is sampled on the edge of the Yee cell, the magnetic field is sampled at the center of the face of the Yee cell, the electric field is surrounded by four magnetic fields, and the magnetic field is surrounded by four electric fields;

[0047] Step 2, using statistical methods to construct a random strip fault zone model;

[0048] When establishing a conductivity model to calculate the electromagnetic response in the time domain, it is common practice to set the conductivity of the same medium as a constant. However, in a random ...

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Abstract

The invention discloses a method for building and judging a three-dimensional strip-shaped random fault zone model in the aviation time domain. The method comprises the steps of step 1, performing gridding subdivision on a geodetic model by adopting Yee grids; step 2, conducting a random strip-shaped fault zone model by adopting the statistical method; step 3, determining the number and the widthof random fault zones; step 4, deducing a explicit differential iterative formula in six direction magnetic fields and electric fields; step 5, endowing a corresponding random electric conductivity value to a geodetic grid model; step 6, judging the tendency and the position of the model through a response curve and a slicing diagram. By adopting the method, the blank of the time domain electromagnetic method in the exploration of fault zones can be made up. The accuracy and the reliability of the electromagnetic method in the exploration of oil and gas reservoirs are greatly improved. The efficiency of related work is improved, and the exploration cost is greatly reduced.

Description

technical field [0001] The invention relates to a method for establishing and discriminating a model of a random strip-shaped fault zone, in particular to a method for establishing and discriminating a model of a three-dimensional strip-shaped random fault zone in the airborne time domain. Background technique [0002] The Fixed-wing Time-Domain Electromagnetic (FTEM) system uses a fixed-wing aircraft as a flight platform. This system is widely used in the rapid exploration of complex areas such as mountains, deserts, lakes, swamps, and land-sea interaction zones. Oil and gas, metal deposits, groundwater detection and geological mapping are playing an increasingly important role. In recent years, the refined exploration of complex underground structures has received widespread attention, and fault zones, as a highly complex geological structure, have gradually become a research hotspot. Generally, scholars believe that fault zones are accompanied by oil and gas generation, ...

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Application Information

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IPC IPC(8): G01V3/38G01V3/08
CPCG01V3/08G01V3/38
Inventor 关珊珊于一兵嵇艳鞠黎东升耿毅男
Owner JILIN UNIV
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