Multi-polarization magnetotelluric sounding method

A technology of magnetotelluric sounding and line surveying, applied in the field of geophysical exploration, can solve problems such as inability to complete characterization, and achieve the effects of improving shallow detection accuracy, weakening static effects and high reliability

Active Publication Date: 2019-11-22
HUNAN WUWEI GEOLOGICAL SCI & TECH CO LTD
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Problems solved by technology

However, the underground medium is a complex three-dimensional geological body, and one electric field pitch cannot completely describe the electromagnetic multi-polarization response characteristics of the complex and irregular three-dimensional geological body underground (such as figure 1 shown)

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Embodiment Construction

[0038] Such as Figure 4 Shown is the method flow diagram of the method of the present invention: this multi-polarization magnetotelluric sounding method provided by the present invention comprises the following steps:

[0039] S1. On each measuring point, with the measuring point as the center, several pairs of electrodes are set along the direction of the survey line and the method of vertical survey line to observe the electric field in the x direction and the y direction; specifically, several pairs of electrodes are set according to the following rules:

[0040] R1: the number of electrode pairs N=ceil[lg(f max )]-floor[lg(f min )]; where f max is the maximum target frequency, f min is the minimum target frequency, ceil() is an upward rounding function, and floor() is a downward rounding function;

[0041] R2: The electrode distance of the nth group is n times of the unit electrode distance; n is a natural number from 1 to N;

[0042] R3: The unit electrode distance ...

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Abstract

The invention discloses a multi-polarization magnetotelluric sounding method, which comprises the following steps: at each measuring point, with the measuring point as the center, setting a pluralityof pairs of electrodes in the direction of a measuring line and the direction vertical to the measuring line, and observing electric fields in the x and y directions; setting magnetic rods in the x direction and the y direction vertical to the measuring line and observing magnetic fields in the x and y directions; observing multi-electrode-spacing electric fields and magnetic fields simultaneouslyand obtaining a magnetic field actually-measured time sequence and an electric field actually-measured time sequence; and carrying out data processing on the magnetic field actually-measured time sequence and the electric field actually-measured time sequence to finish common-point same-frequency multi-polarization magnetotelluric sounding. The multi-polarization magnetotelluric sounding method can carry out common-point same-frequency multi-electrode-spacing sounding, and can weaken the static effect caused by a surface heterogeneous body through data processing, thereby improving detectionaccuracy of complex and irregular three-dimensional geological bodies; and the method is high in reliability and is simple and convenient.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, and in particular relates to a multi-polarization magnetotelluric sounding method. Background technique [0002] Tichonov in 1950 and Cagnaird in 1953 proposed the magnetotelluric method (MT) based on the theory of plane electromagnetic waves, and gradually developed the audio-frequency magnetotelluric method (AMT) and controllable Source audio magnetotelluric sounding (CSAMT), collectively referred to as plane wave magnetotelluric sounding, these methods are widely used in the field of geological exploration. At present, the observation methods based on the plane wave electromagnetic sounding method can be divided into the following types: 1. Scalar mode, observe a set of horizontally orthogonally polarized electric and magnetic fields; 2. Vector mode, observe two groups of horizontally orthogonally polarized Electric field and magnetic field; 3. Tensor mode, not only to observe two sets ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/12G01V3/38
CPCG01V3/12G01V3/38
Inventor 席振铢龙霞王亮陈兴朋韦洪兰肖炜周胜薛军平黄基文
Owner HUNAN WUWEI GEOLOGICAL SCI & TECH CO LTD
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