Horizontal magnetic field and in-well vertical magnetic field combined measurement method based on ground base point

A technology of vertical magnetic field and measurement method, applied in geophysical measurement, measurement device, radio wave measurement system, etc., can solve the problem of limited resolution of deep geological body identification, save data storage space, improve measurement reliability, The effect of reducing waste of resources

Active Publication Date: 2022-05-13
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, due to the influence of the skin effect, the identification resolution of deep geological bodies may be limited

Method used

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  • Horizontal magnetic field and in-well vertical magnetic field combined measurement method based on ground base point
  • Horizontal magnetic field and in-well vertical magnetic field combined measurement method based on ground base point
  • Horizontal magnetic field and in-well vertical magnetic field combined measurement method based on ground base point

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Embodiment

[0054] Such as figure 1As shown, the present invention provides a joint measurement method based on the horizontal magnetic field of the ground base point and the vertical magnetic field in the well. The inclination data is obtained through the horizontal magnetic field of the ground base point and the vertical magnetic field in the well, which improves the measurement accuracy of the magnetic field inversion. Its specific implementation steps are as follows:

[0055] (1) Set ground base points, arrange horizontal magnetic rods, and collect ground magnetic field data

[0056] Use GPS to locate the ground base point that is far away from the target area, and lay two magnetic rods horizontally at a distance of 10m. A magnetic rod is oriented north-south to measure the magnetic field data H dx , and the other magnetic rod faces east-west to measure the magnetic field data H dy , the purpose of selecting the base point at a far position is to avoid the influence of deep undergr...

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Abstract

The invention discloses a horizontal magnetic field and in-well vertical magnetic field combined measurement method based on a ground base point. The method comprises the following steps: acquiring in-well vertical magnetic field data of a ground horizontal magnetic field and a to-be-measured target area based on a natural magnetotelluric field source; constructing a spatial three-dimensional model; tipper data are arranged according to ground base point horizontal magnetic field data and in-well vertical magnetic field data; performing staggered grid finite difference forward modeling on the three-dimensional model according to the tipper data to obtain tipper forward modeling data; establishing a three-dimensional regularization inversion objective function, and calculating to obtain the gradient of the three-dimensional regularization inversion objective function; and based on the gradient of the three-dimensional regularization inversion objective function, performing inversion on the uniform half-space initial model by using the tipper forward modeling data to obtain a magnetic field response result of the underground deep geologic body. Through vertical magnetic field information in a well and horizontal magnetic field data collected by a ground base point, tipper data is established, three-dimensional magnetic field anomaly of an underground deep geologic structure is obtained, and the precision of inversion of a deep geologic body is effectively improved.

Description

technical field [0001] The invention relates to the technical field of natural magnetotelluric field measurement, in particular to a method for joint measurement of a horizontal magnetic field based on ground base points and a vertical magnetic field in a well. Background technique [0002] The natural magnetotelluric field, with its enormous energy and wide frequency range, can pass through the thick lithosphere and provide effective information for the study of the deep structure of the earth. When the alternating electromagnetic field propagates in the underground medium, according to the principle of skin depth, detection at different depths corresponds to different frequency signals, which can be used to solve many geological problems. Magnetotelluric sounding (magnetotelluric, MT) takes the natural field as the field source to play a unique advantage. It has the advantages of large exploration depth, portable equipment, low cost of detection, not shielded by high-resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/40
CPCG01V3/40Y02A90/30
Inventor 王堃鹏李棂泽王向鹏罗威纪伟
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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