Static Effect Correction Method Based on Plane Wave Electromagnetic Sounding
A static effect and electromagnetic sounding technology, applied in geophysical surveying, instruments, etc., can solve problems such as complicated methods, high work intensity, time-consuming and laborious calibration work, etc., and achieve high calibration accuracy, simple and reliable methods, and direct measurement effects
Active Publication Date: 2018-08-14
CENT SOUTH UNIV +1
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Problems solved by technology
However, the above-mentioned correction methods are either complicated and difficult to implement, or the correction work is time-consuming and labor-intensive, and the work intensity is high.
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[0034] Such as figure 1 Shown is the method flowchart of the method of the present invention: this static effect correction method based on plane wave electromagnetic sounding provided by the present invention comprises the following steps:
[0035] S1. Before the measurement, supply direct current to the extension lines on both sides of the measuring electrodes at the electromagnetic sounding point. figure 2 shown);
[0036] S2. When the DC power supply is used, record the voltage value U of the measurement point A when the voltage is stable;
[0037] S3. Stop the DC power supply after the stable voltage value U is recorded in step S2, and record the voltage U generated by the accumulated charge after power failure 2 ;
[0038] S4. Use the following formula to calculate the static correction coefficient k:
[0039] k=U 2 / (U-U 2 )
[0040] S5. Utilize the static correction coefficient k that step S4 obtains, adopt following formula to correct static effect:
[0041] ...
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The invention discloses a static effect correcting method based on plane wave electromagnetic sounding. The method comprises the following steps of: supplying direct currents and measuring polar distances which are not less than three times of a power supply polar distance to the extension cords on the two sides of a measuring electrode at an electromagnetic sounding point; recording a voltage value U at a measuring point A when the voltage is stable; stopping the supply of the direct currents and recording a voltage U2 generated by the accumulated charges after the power outage; calculating a static correcting coefficient k; and correcting a static effect. According to the static effect correcting method based on plane wave electromagnetic sounding disclosed by the invention, in the manner of supplying the direct currents to the extension cords on the two sides of the measuring electrode, the static effect in the plane wave ground electromagnetic sounding is directly corrected by adopting a direct measuring total electric field and an accumulated electric field, so that the correcting precision is high, the measurement is direct and the method is simple and reliable.
Description
technical field [0001] The invention belongs to the field of geophysics, and in particular relates to a static effect correction method based on plane wave electromagnetic sounding. Background technique [0002] In 1950, Tichonov and Cagnaird proposed the magnetotelluric sounding method (MT) based on the plane electromagnetic wave theory, and gradually developed the audio-frequency magnetotelluric sounding method (AMT) and controllable Source audio magnetotelluric sounding (CSAMT), collectively known as plane wave magnetotelluric sounding. These methods are widely used in the field of geological exploration. However, when there is a local conductive inhomogeneity near the surface, under the action of the external electric field, the surface of the inhomogeneity will generate accumulated charges, thereby generating an additional electric field proportional to the external electric field, resulting in distortion of the measured electric field, which is almost It has nothing ...
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IPC IPC(8): G01V13/00
CPCG01V13/00
Inventor 席振铢李国瑞龙霞黄龙周胜侯海涛宋刚陈兴朋薛军平亓庆新王亮肖炜韦洪兰王鹤边祥会董志强潘继敏范福来席贝格董轩铭
Owner CENT SOUTH UNIV