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Multi-component marine electromagnetic signal acquisition cable, system and method

A cable and marine technology, used in radio wave measurement systems, electromagnetic wave detection, electric/magnetic exploration, etc.

Inactive Publication Date: 2014-06-25
KJT ENTPR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no active sources in such MT methods, which rely on naturally occurring EM fields

Method used

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  • Multi-component marine electromagnetic signal acquisition cable, system and method
  • Multi-component marine electromagnetic signal acquisition cable, system and method
  • Multi-component marine electromagnetic signal acquisition cable, system and method

Examples

Experimental program
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Embodiment Construction

[0060] An example of a marine electromagnetic (EM) survey acquisition system is in figure 1 shown schematically. The system may include a survey vessel 10 moving along the surface of a body of water 11 such as a lake or ocean. The survey vessel 10 includes thereon certain equipment, shown generally at 12 and referred to for convenience as a "recording system". Recording system 12 may include (not one individually shown below for clarity of illustration) navigation means, source excitation and control equipment, and means for recording and processing measurements made by the various sensors in the acquisition system. The vessel 10 may tow a seismic energy source 14 such as an air gun or an array of such air guns, a vertical electric dipole "source" antenna 19 comprising vertically spaced electrodes 16C, 16D and may comprise horizontally spaced electrodes 16A, Horizontal electric dipole "source" antenna 17 at 16B. The vertical electrodes 16C, 16D are typically powered by curr...

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Abstract

A marine electromagnetic sensor cable includes a plurality of sensor modules disposed at spaced apart locations along a cable. Each module includes at least one pair of electrodes associated with the module. The electrodes are arranged to measure electric field in a direction along the direction of the cable. The cable is arranged to form a closed pattern. Another marine electromagnetic sensor cable includes a plurality of sensor modules disposed at spaced apart locations along a cable. Each module includes at least one pair of electrodes associated therewith. The electrodes are arranged to measure electric field in a direction along the direction of the cable. A plurality of spaced apart magnetic field sensors is associated with each module and arranged to enable determining an electric field amplitude in a direction transverse to the direction of the cable from magnetic field gradient.

Description

technical field [0001] The present invention relates generally to the field of marine electromagnetic geophysical surveying. More specifically, the present invention relates to cables and related equipment for acquiring, recording and transmitting generated electromagnetic signals for subsurface geodesic exploration. Background technique [0002] Electromagnetic geophysical surveys include "controlled source" and natural source electromagnetic surveys. Controlled source electromagnetic surveying involves applying electric or magnetic fields to earth formations, those formations below the seafloor in marine surveys, and by measuring voltage differences induced at electrodes, antennas and / or interrogating the surface or on the seafloor or The upper magnetometer measures the magnitude of the electric field and / or the magnitude of the magnetic field. Electric and / or magnetic fields are induced in response to electric and / or magnetic fields applied to the earth's subsurface, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/00
CPCG01V3/12G01V3/083Y02A90/30
Inventor K·M·斯特拉克S·L·赫尔维希
Owner KJT ENTPR
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