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A seabed natural potential detection and interference correction method equipped with transient electromagnetic

A natural potential and transient electromagnetic technology, applied in the direction of electric/magnetic exploration, radio wave measurement system, measurement device, etc., can solve the problems of large influence, small data amplitude, interference, etc., and achieve the effect of improving the effect

Active Publication Date: 2021-01-19
SECOND INST OF OCEANOGRAPHY MNR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the partial shielding effect of the camera towed body, the amplitude of the collected data is small. In addition, the natural electric field signal observed by the electrode is significantly interfered by the flashlight (mainly pulse signal), and the towed body's posture (swinging back and forth ) and the impact of drag body bottoming out is greater

Method used

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  • A seabed natural potential detection and interference correction method equipped with transient electromagnetic
  • A seabed natural potential detection and interference correction method equipped with transient electromagnetic
  • A seabed natural potential detection and interference correction method equipped with transient electromagnetic

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Embodiment 1

[0033] like figure 1 As shown, the present invention designs a new submarine natural potential observation method equipped with a transient electromagnetic double drag body, which keeps the electrode distance stable and synchronizes with the transient electromagnetic instrument during the process of towing to observe the natural potential, and eliminates electrode distance changes , Undersea currents and other sources of potential anomalies, including:

[0034] 1) The specific deployment process of this observation method

[0035] The submarine natural potential observation device consists of a collection cabin, 6 electrodes and a 20m electrode wire. The electrodes form a group in pairs, and the three groups of electrodes output three groups of potential differences (E12, E34, E56). figure 1 The middle is the seabed natural potential observation method of the present invention equipped with transient electromagnetic double drag bodies. The number in the figure is the electro...

Embodiment 2

[0041] A method for correcting transient electromagnetic double-drag body electrical interference by using morphological filtering, comprising the following steps:

[0042] S1: Use the above seabed natural potential observation method to drag horizontally along the survey line to obtain natural electric field data, and use a higher frequency (2400Hz) than the transient electromagnetic emission bipolar square wave to collect;

[0043] S2: After recovering the transient electromagnetic double-drag body, export the natural electric field data from the acquisition cabin, obtain the natural potential data by equivalent calculation and integration, and resample to filter out the induced electric field signal generated by the transient electromagnetic loop source;

[0044] S3: Select a suitable window length (30-60s) according to prior information such as ship speed (1-2knot) and the range of sulfide ore bodies, and use the morphological filtering method within the window length to re...

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Abstract

The invention discloses a submarine spontaneous potential observation method with transient electromagnetic double trailers and an electric interference correction method. The double trailers of a transient electromagnetic instrument are connected through a relay cable. An electrode cable is bound to the relay cable. A plurality of AgCl non-polarized electrode pairs are arranged on the electrode cable in sequence, and each group of electrode distance is identical. The weak positive buoyancy of the double trailers is applied to flatten the electrode cable to form horizontal observation. The electrode distance is enabled to be constant in the process of observing the spontaneous potential by horizontal towing on the sea floor, the false abnormality of the spontaneous potential caused by the change of the electrode distance can be eliminated, location is performed by the ultra-short baseline and the attitude sensor and the horizontal deflection angle is recorded and the electrode cable is maintained to be level during the towing process. Secondly, compared with the conductivity anomaly detected by the transient electromagnetic instrument, the potential anomaly caused by the bottom current is eliminated. In addition, the morphological method is applied to remove the interference of transient electromagnetic signals, and the filtering effect is improved. The guarantee can be provided for the more accurate observation of the spontaneous potential generated by the seafloor ore body.

Description

technical field [0001] The invention relates to the technical field of seabed ore body electrical exploration, in particular to a seabed natural potential observation method equipped with a transient electromagnetic double-drag body and a method for correcting electric interference morphology. Background technique [0002] The near-bottom spontaneous potential method is a very important geophysical prospecting method for sulfide orebodies. In the traditional observation method, the electrodes need to be carried by steel cables and camera drag bodies. Hanging on the steel cable, the vertical observation mode of the natural potential sensor, the position of the electrode is fixed on the steel cable with a buckle, the electrode will move with the steel cable, and its swing frequency will affect the electric field signal, and the current in the steel cable will also It affects the effect of electrode observation signal and reduces the signal-to-noise ratio of spontaneous potent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/08
CPCG01V3/083G01V3/088
Inventor 陶春辉朱忠民王文义沈金松邓显明周建平李泽金小兵
Owner SECOND INST OF OCEANOGRAPHY MNR
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