Towing type marine electromagnetic data acquisition cable

Abstract

The invention provides a towing type marine electromagnetic data acquisition cable. The towing type marine electromagnetic data acquisition cable comprises an acquisition cable sheath; the acquisitioncable sheath is a long-strip-shaped hollow cavity; one end of the cavity is provided with a cable hole communicating with the internal part of the cavity; a non-magnetic cable and a cable are arranged in the cable hole; one end of the non-magnetic cable is connected with an internal chamber of one end, far from the cable hole, of the cavity; the other end of the non-magnetic cable is arranged atthe external part of the cavity through the cable hole; the internal part of the cavity is uniformly distributed with n electrode supports (n is a positive integer); the electrode supports are connected with an inner wall of the cavity; the position of each electrode support, corresponding to the acquisition cable sheath, is provided with at least an electrode installing hole whose internal and external parts are through; tantalum capacitor non-polarized electrodes connected with the corresponding electrode supports are arranged in the electrode installing holes; and a signal acquisition unitis arranged between each two electrode supports in the cavity. The beneficial effects of the towing type marine electromagnetic data acquisition cable are that the polarization effect of the electrodes is reduced, the noise level is reduced, and the detection of weak marine electromagnetic field signals is facilitated.

Description

technical field [0001] The invention relates to the technical field of marine exploration, in particular to a towed marine electromagnetic data acquisition cable. Background technique [0002] The ocean contains abundant resources, 70% of the earth's surface is covered by the ocean, and various mineral resources such as oil, natural gas, and rare metals have extremely rich reserves on the seabed, and these resources need to be identified and exploited. In the field of marine exploration technology, marine electromagnetic data is of great significance to the exploration and comprehensive evaluation of seabed minerals and oil and gas resources. [0003] The existing marine electromagnetic data acquisition methods can mainly include two types: the first is that the marine electromagnetic data acquisition cable is towed in seawater or laid on the seabed, and the marine electromagnetic (current) excitation source is dragged and excited in the water, and the towed The marine elec...

AI Technical Summary

Problems solved by technology

[0004] At present, the electrodes in the industry that use marine electromagnetic streamers to measure the electric field components along the cable direction are ordinary metal ring electrodes, and no non-polarized electrodes are used. Therefore, the polarization effect of the electrodes themselves is relatively large, resulting in high noise levels of the electrodes. , which is not conducive to the detection of weak ocean electric field signals with large offsets or deep formations below the seabed

However, the silver chloride non-polarized electrodes widely used in sunken marine electromagnetic data collection stations cannot be used in towed marine electromagnetic data collection cables due to their need to be immersed in seawater or salt water for storage, and their special cylindrical structure. to measure the ocean electric field component along the cable direction

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