CN111580168A - Ocean magnetic method measuring system and application thereof - Google Patents

Ocean magnetic method measuring system and application thereof Download PDF

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Publication number
CN111580168A
CN111580168A CN202010353405.9A CN202010353405A CN111580168A CN 111580168 A CN111580168 A CN 111580168A CN 202010353405 A CN202010353405 A CN 202010353405A CN 111580168 A CN111580168 A CN 111580168A
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magnetic
marine
measurement
magnetometer
ocean
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吴治国
刘洪波
王玉敏
臧凯
胡蕾
张宁
何玉海
张超
张一�
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Shandong Institute of Geophysical and Geochemical Exploration
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Shandong Institute of Geophysical and Geochemical Exploration
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/38Processing data, e.g. for analysis, for interpretation, for correction

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  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Electromagnetism (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The invention relates to a marine magnetic method measuring system and application thereof, wherein the measuring system comprises a work ship, a navigation system, a differentiator, a generator, an acquisition system, a communication cable, a marine magnetometer and a buoy; navigation, differentiator, generator and collection system connect gradually and all set up on the work ship, and in the sea was arranged in to ocean magnetometer, ocean magnetometer passed through communication cable and is connected with collection system, and the surface of ocean is arranged in and is connected ocean magnetometer to the cursory. By utilizing the marine magnetic method measuring system and the marine magnetic method measuring working method provided by the invention, scientific researchers have rules and can follow, compared with the traditional marine magnetic method measuring method, the marine magnetic method measuring system has the advantages of rigorous measuring process and accurate and reliable measuring result, and provides a new standard for marine magnetic method measuring operation.

Description

Ocean magnetic method measuring system and application thereof
Technical Field
The invention relates to a marine magnetic method measuring system and application thereof, belonging to the technical field of marine geophysical exploration.
Background
The method promotes the comprehensive development of marine engineering exploration, mineral resource exploration, basic geological research, underwater archaeological excavation and the like, and marks that the development and utilization of the ocean by human beings enter a new stage. Geophysical prospecting is one of the main prospecting means, has the characteristics of high resolution, low cost, high efficiency, greenness, no harm and the like, and is better applied and developed.
The marine magnetic survey is an important marine geophysical survey method, is mainly applied to delineating rock masses, dividing lithology, deducing fracture structures and the like, and provides a basis for marine geological scientific research and mineral resource survey; the method is also applied to the fields of ocean engineering investigation such as ocean bridge and tunnel engineering construction, submarine optical cable routing and oil-gas pipeline investigation, submarine magnetic object detection and the like.
For example, chinese patent document CN103091718A discloses a method for marine oil and gas resource exploration using very low frequency marine electromagnetic method, which includes establishing a very low frequency transmitting station and a transmitting antenna, and laying a submarine data acquisition station in a determined exploration sea area, receiving signals of the very low frequency electromagnetic signals reflected by a submarine medium by using the submarine electromagnetic signal acquisition station, then calculating apparent resistivity and phase of the submarine medium according to the received electromagnetic signal data, and obtaining the structural condition of the submarine oil and gas resource through inversion and geological interpretation. Compared with the marine magnetotelluric method, the method for exploring the marine oil and gas resources by using the extremely-low-frequency marine electromagnetic method has the advantages that the measurement precision of electromagnetic signals is improved, the exploration precision is further improved, compared with the marine artificial source electromagnetic method applied at present, a self-contained emission source is omitted, the construction difficulty and the construction cost are saved, and the method is a detection method combining the advantages of the marine magnetotelluric method and the marine artificial source electromagnetic method.
For another example, chinese patent document CN201583670U discloses a data acquisition system for inland and offshore water magnetic prospecting, which at least includes a working platform, a magnetometer and a GPS, the magnetometer is a ground magnetometer, a probe of the magnetometer is fixed to the working platform through a non-magnetic support, and one or more magnetometers are placed on the working platform. The utility model overcomes the magnetic field influence of the working platform, and is convenient for the selection of the working platform; the nonmagnetic bracket fixes the magnetometer probe, so that the positioning precision is improved; the ground magnetometer is selected to carry out magnetic prospecting work in the water area, so that the accurate positioning of the target body is met; the working platform is provided with a system for simultaneously measuring a plurality of magnetometers, so that the working efficiency is greatly improved; the magnetometer and the GPS are used for respectively finishing the measurement work of the magnetic field and the position of the measuring point, and the data information acquired on site is imaged, thereby being beneficial to the subsequent processing and interpretation work of the magnetic measurement data.
Compared with other exploration means, the marine magnetic method measurement method has the advantages that magnetic objects on the shallow surface of the sea bottom and below can be detected, but a complete measurement system and a complete working process are not formed at present, and no rules can be followed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the marine magnetic method measuring system which is scientific and reasonable in design, convenient to operate and capable of effectively carrying out marine magnetic method measuring operation.
The invention also provides a working method of the marine magnetic method measuring system.
The technical scheme of the invention is as follows:
a marine magnetic method measuring system comprises a workboat, a navigation system, a differentiator, a generator, an acquisition system, a communication cable, a marine magnetometer and a buoy; navigation, differentiator, generator and collection system connect gradually and set up on the work ship, and ocean magnetometer is arranged in the sea water, and ocean magnetometer passes through communication cable and is connected with collection system, and the surface of sea is arranged in to the float and is connected ocean magnetometer.
Preferably, the work ship is a wood structure ship, a glass fiber reinforced plastic structure nonmagnetic ship or a glass fiber reinforced plastic structure weak magnetic ship.
Preferably, the navigation system comprises a GPS global positioning system, a "glonass" navigation system, a galileo satellite navigation system, a beidou satellite navigation system, an MSAS multi-function satellite constellation augmentation system or a StarFire global constellation augmentation system.
Preferably, the buoy is made of a hollow plastic material or a solid foam material. The advantage of this design lies in, and the buoy can suspend in the sea surface, possesses the ability of suspension ocean magnetometer, and the operating conditions of ocean magnetometer is observed to the accessible buoy.
Preferably, the distance between the marine magnetometer and the working ship is 3-5 times of the length of the ship body. The design has the advantages that the distance between the marine magnetometer and the working ship is not suitable for being too far or too close, the specific distance needs to be determined according to actual conditions through tests, and finally the interference is removed through a ship body correction test.
Preferably, the communication cable is an insulated communication cable. The benefit of this design is that the communication cable needs to have sufficient pull and abrasion resistance while having insulating properties to avoid interference.
Preferably, the acquisition system comprises marine magnetic measurement acquisition software MagLog.
Preferably, the differentiator performs satellite time synchronization with the navigation system and the acquisition system.
Preferably, the difference meter is used for transmitting the coordinate data of the workboat in real time for the acquisition system.
An ocean magnetic method measurement working method utilizes the ocean magnetic method measurement system, and comprises the following steps:
(1) project investigation: at present, the marine magnetic method measurement item is developed, the work area is researched, relevant data including natural environment, human environment, past geophysical and geological data, rock magnetic data and measurement parameters are collected, the sea condition of the work area is explored on site, and water level, ports and interference factors are known;
(2) laying a measuring net: the layout of the measuring net is determined according to a design scale, the measuring line distance is not more than 1cm of the length of the drawing scale, and a measuring line on the minimum plastid is ensured to pass through; the distance between the measuring points is ensured that at least 3 continuous measuring points on each measuring line can reflect abnormity on the set working precision;
(3) testing equipment: all the working magnetometers perform noise tests and consistency tests;
(4) establishing a base point and a daily change station: selecting a base point and a daily variation station according to a regional delta T plane diagram, wherein the peripheral topography of the daily variation station is flat, no magnetic interference substances exist, the magnetic field is stable, and the magnetic field variation is less than +/-1.0 nT within the diameter of 4 m;
(5) base point T0Value determination: to accurately find T0The value is observed for 24 hours long period daily change, a section with daily change of less than 2nT for two hours is selected to be taken as an average value, and the average value is taken as T of a measuring area0A value;
(6) installing equipment: installing and connecting a work ship, a navigation system, a differential instrument, a generator, an acquisition system, a communication cable, an ocean magnetometer and a buoy to form the ocean magnetic method measurement system;
(7) magnetic orientation test: carrying out a magnetic orientation influence test on the working ship, selecting a stable magnetic field area, carrying out eight-orientation dragging magnetic measurement to determine the influence of different orientation ship bodies on the magnetic measurement, and carrying out data correction;
(8) and (3) dragging distance test: selecting a stable magnetic field interference-free area, carrying out a marine magnetometer dragging distance test, throwing the marine magnetometer into the sea, keeping the position of the marine magnetometer still, sailing a working ship to a distance by taking the throwing position of the marine magnetometer as a starting point, observing the change of magnetic measurement data, and setting the optimal dragging distance when the magnetic measurement data are stable and unchanged;
(9) connecting equipment: connecting all equipment on a deck of a working ship, fixing the marine magnetometer and the buoy, starting the marine magnetometer until signals are stable, and putting the marine magnetometer after magnetic measurement data do not jump;
(10) synchronization time: before measurement is started, time synchronization is carried out on the marine magnetometer, the marine magnetic method acquisition system and the navigation system;
(11) and (3) navigation measurement: the working ship is subjected to navigation measurement along a measuring line, the time interval for acquiring observation data is 0.2-5 s, the navigation speed is gradually increased to the normal measurement navigation speed for 3-6 knots, and the working ship keeps running at a constant speed; in the process of navigation measurement, monitoring the constant stress of the communication cable, finding that the communication cable is abnormally stressed and immediately decelerating, and recovering the ocean magnetometer; in the process of navigation measurement, when signal interruption is found, the speed is reduced immediately, and the marine magnetometer is recovered;
(12) laying a connecting line: laying a connecting line as the measurement work is carried out, and checking the measurement precision of the magnetic method by using the connecting line as the marine magnetic method measurement quality checking work, wherein the connecting line is a measurement line which is distributed in a cross way with a normal measurement line;
(13) and (4) finishing the measurement: after returning to the correction point, finishing the measurement work of the ocean magnetic method, then processing data, and respectively carrying out daily variation correction, normal field correction and elevation correction on the original data to obtain a delta T magnetic abnormal value;
(14) magnetic data processing and conversion: the method comprises the following steps of (1) carrying out kriging gridding on delta T abnormal data; calculating an abnormal delta T electrode; thirdly, converting the diagram of the delta T abnormity;
(15) writing a report: and deducing a geological structure according to the graph, delineating the magnetic abnormal body and compiling a result report.
The invention has the beneficial effects that:
1. the marine magnetic method measuring system adopts the marine magnetometer, the marine magnetic method acquisition system and other equipment to form the whole marine magnetic method measuring system, has scientific and reasonable design, simple installation and connection and convenient use, and can ensure the accuracy of marine magnetic method measurement.
2. By utilizing the marine magnetic method measuring system and the marine magnetic method measuring working method provided by the invention, scientific and rigorous measuring processes are scientific and rigorous, measuring results are more accurate and reliable, and a new standard is provided for marine magnetic method measuring operation.
Drawings
FIG. 1 is a schematic diagram of the connection relationship of the marine magnetic measurement system of the present invention;
FIG. 2 is a flow chart of the marine magnetic method measurement working method of the present invention;
in the figure: 1-marine magnetometer; 2-floating; 3-seawater; 4-a communication cable; 5-marine magnetic acquisition system; 6-a generator; 7-differencing machines (GNSS); 8-a navigation system; 9-a work ship.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, the present embodiment provides an ocean magnetic method measurement system, which includes a workboat 9, a navigation system 8, a differentiator 7, a generator 6, an acquisition system 5, a communication cable 4, an ocean magnetometer 1 and a buoy 2; navigation system 8, differentiator 7, generator 6 and collection system 5 connect gradually and install on work ship 9, and ocean magnetometer 1 is arranged in the sea water, and ocean magnetometer 1 passes through communication cable 4 to be connected with collection system 5, and buoy 2 arranges the ocean surface in and connects ocean magnetometer 1.
The work ship 9 is one of a wood structure ship, a glass fiber reinforced plastic structure nonmagnetic ship or a glass fiber reinforced plastic structure weak magnetic ship, and aims to avoid magnetic interference in the marine magnetic method measurement process and ensure the accuracy of data acquisition.
The navigation system 8 is selected from one of a GPS global positioning system, a "Glonass" navigation system, a Galileo satellite navigation system, a Beidou satellite navigation system, an MSAS multi-function satellite-based augmentation system or a Starfire global satellite-based augmentation system.
The buoy 2 is made of hollow plastic material or solid foam material. The buoy can suspend in the sea surface, possesses the ability of suspension ocean magnetometer, and the operating conditions of ocean magnetometer is observed to the accessible buoy, discovers there is the abnormal conditions, can retrieve ocean magnetometer immediately.
The distance between the marine magnetometer 1 and the working ship 9 is 3-5 times of the length of the ship body. The distance between the marine magnetometer and the working ship is not suitable for being too far and too close, the specific distance needs to be determined according to actual conditions in a test, and finally the interference is removed through a ship body correction test.
The communication cable 4 is an insulated communication cable. The communication cable needs to have sufficient pulling force and abrasion resistance, guarantees to effectively pull ocean magnetometer, has insulating properties simultaneously, avoids data transmission to receive the interference.
The acquisition system 5 comprises marine magnetic measurement acquisition software MagLog. MagLog is an advanced geophysical data recording software package for serial, USB and network interface instruments, designed primarily for airborne and marine data acquisition, where multiple data sources require precise time synchronization.
The differentiator 7 performs satellite time synchronization with the navigation system 8 and the acquisition system 5, and the differentiator 7 transmits coordinate data of the workboat in real time for the acquisition system 5.
The marine magnetic method measuring system is scientific and reasonable in design, convenient to install, connect and use, meticulously designed in selection of all devices, and reasonable in coordination among all devices, and provides a powerful tool for subsequent marine magnetic method measurement.
Example 2:
as shown in the flowchart of fig. 2, the present embodiment provides an ocean magnetic method measurement working method, and with the ocean magnetic method measurement system provided in embodiment 1, the specific working method includes the following steps:
(1) project investigation: at present, the marine magnetic method measurement item is developed, the work area is researched, relevant data including natural environment, human environment, past geophysical and geological data, rock magnetic data and measurement parameters are collected, the sea condition of the work area is explored on site, and water level, ports and interference factors are known;
(2) laying a measuring net: the layout of the measuring net is determined according to a design scale, the measuring line distance is not more than 1cm of the length of the drawing scale, and a measuring line on the minimum plastid is ensured to pass through; the distance between the measuring points is ensured that at least 3 continuous measuring points on each measuring line can reflect abnormity on the set working precision;
(3) testing equipment: all the magnetometers participating in the work need to carry out noise tests and consistency tests, so that the consistency and accuracy of data acquisition in the whole process are guaranteed;
(4) establishing a base point and a daily change station: selecting a base point and a daily variation station according to a regional delta T plane diagram, wherein the peripheral topography of the daily variation station is flat, no magnetic interference substances exist, the magnetic field is stable, and the magnetic field variation is less than +/-1.0 nT within the diameter of 4 m;
(5) base point T0Value determination: to accurately find T0The value is observed for 24 hours long period daily change, a section with daily change of less than 2nT for two hours is selected to be averaged, and the value is taken as T of the measuring area0A value;
(6) installing equipment: installing and connecting a work ship, a navigation system, a differential instrument, a generator, an acquisition system, a communication cable, an ocean magnetometer and a buoy to form the ocean magnetic method measurement system;
(7) magnetic orientation test: carrying out a ship magnetic orientation influence test, selecting a stable magnetic field area, carrying out eight-orientation dragging magnetic measurement to determine the influence of different orientation ship bodies on the magnetic measurement, and carrying out data correction;
(8) and (3) dragging distance test: selecting a stable magnetic field interference-free area, carrying out a marine magnetometer dragging distance test, throwing the marine magnetometer into the sea, keeping the position of the marine magnetometer still, sailing a working ship to a distance by taking the throwing position of the marine magnetometer as a starting point, observing the change of magnetic measurement data, and setting the optimal dragging distance when the magnetic measurement data are stable and unchanged;
(9) connecting equipment: connecting all equipment on a deck of a working ship, fixing the marine magnetometer and the buoy, starting the marine magnetometer until signals are stable, and putting the marine magnetometer after magnetic measurement data do not jump;
(10) synchronization time: before measurement is started, time synchronization is carried out on the marine magnetometer, the marine magnetic method acquisition system and the navigation system;
(11) and (3) navigation measurement: the working ship is subjected to navigation measurement along a measuring line, the time interval for acquiring observation data is 0.2-5 s, the navigation speed is gradually increased to the normal measurement navigation speed for 3-6 knots, and the working ship keeps running at a constant speed; in the process of navigation measurement, monitoring the constant stress of the communication cable, finding that the communication cable is abnormally stressed and immediately decelerating, and recovering the ocean magnetometer; in the process of navigation measurement, when signal interruption is found, the speed is reduced immediately, and the marine magnetometer is recovered;
(12) laying a connecting line: laying a connecting line as the measurement work is carried out, and checking the measurement precision of the magnetic method by using the connecting line as the marine magnetic method measurement quality checking work, wherein the connecting line is a measurement line which is distributed in a cross way with a normal measurement line;
(13) and (4) finishing the measurement: after returning to the correction point, finishing the measurement work of the ocean magnetic method, then processing data, and respectively carrying out daily variation correction, normal field correction and elevation correction on the original data to obtain a delta T magnetic abnormal value;
(14) magnetic data processing and conversion: the method comprises the following steps of (1) carrying out kriging gridding on delta T abnormal data; calculating an abnormal delta T electrode; thirdly, converting the diagram of the delta T abnormity;
(15) writing a report: and deducing a geological structure according to the graph, delineating the magnetic abnormal body and compiling a result report.
By adopting the measuring method of the embodiment, the whole measuring process is scientific, reasonable, efficient and compact, the coordination among all the devices is perfect, the accuracy of the acquired data is high, excessive interference can be avoided, and an accurate and reliable result report can be finally obtained.

Claims (10)

1. A marine magnetic method measurement system is characterized by comprising a workboat, a navigation system, a differentiator, a generator, an acquisition system, a communication cable, a marine magnetometer and a buoy; navigation, differentiator, generator and collection system connect gradually and set up on the work ship, and ocean magnetometer is arranged in the sea water, and ocean magnetometer passes through communication cable and is connected with collection system, and the surface of sea is arranged in to the float and is connected ocean magnetometer.
2. The marine magnetic method measuring system of claim 1, wherein the work ship is selected from a wood structure ship, a glass fiber reinforced plastic structure nonmagnetic ship or a glass fiber reinforced plastic structure weak magnetic ship.
3. The marine magnetic survey system of claim 1 wherein the navigation system comprises a GPS global positioning system, a "glonass" navigation system, a galileo satellite navigation system, a beidou satellite navigation system, an MSAS multi-function satellite constellation augmentation system or a StarFire global constellation augmentation system.
4. The marine magnetic measurement system of claim 1, wherein the float is a hollow plastic float or a solid foam float.
5. The marine magnetic survey system of claim 1 wherein the marine magnetometer is 3 to 5 times the hull length from the workboat.
6. The marine magnetic survey system of claim 1 wherein the communication cable is selected from an insulated communication cable.
7. The marine magnetic survey system of claim 1 wherein the acquisition system comprises marine magnetic survey acquisition software MagLog.
8. The marine magnetic survey system of claim 1 wherein the differentiator is satellite time synchronized with the navigation system and the acquisition system.
9. The marine magnetic survey system of claim 1 wherein the differentiator transmits real time workboat coordinate data for the acquisition system.
10. An ocean magnetic method measurement working method, which utilizes the ocean magnetic method measurement system of any one of claims 1-9, and the working method comprises the following steps:
(1) project investigation: at present, the marine magnetic method measurement item is developed, the work area is researched, relevant data including natural environment, human environment, past geophysical and geological data, rock magnetic data and measurement parameters are collected, the sea condition of the work area is explored on site, and water level, ports and interference factors are known;
(2) laying a measuring net: the layout of the measuring net is determined according to a design scale, the measuring line distance is not more than 1cm of the length of the drawing scale, and a measuring line on the minimum plastid is ensured to pass through; the distance between the measuring points is ensured that at least 3 continuous measuring points on each measuring line can reflect abnormity on the set working precision;
(3) testing equipment: all the working magnetometers perform noise tests and consistency tests;
(4) establishing a base point and a daily change station: selecting a base point and a daily variation station according to a regional delta T plane diagram, wherein the peripheral topography of the daily variation station is flat, no magnetic interference substances exist, the magnetic field is stable, and the magnetic field variation is less than +/-1.0 nT within the diameter of 4 m;
(5) base point T0Value determination: to accurately find T0The value is observed for 24 hours long period daily change, a section with daily change of less than 2nT for two hours is selected to be taken as an average value, and the average value is taken as T of a measuring area0A value;
(6) installing equipment: installing and connecting a work ship, a navigation system, a differential instrument, a generator, an acquisition system, a communication cable, an ocean magnetometer and a buoy to form the ocean magnetic method measurement system;
(7) magnetic orientation test: carrying out a magnetic orientation influence test on the working ship, selecting a stable magnetic field area, carrying out eight-orientation dragging magnetic measurement to determine the influence of different orientation ship bodies on the magnetic measurement, and carrying out data correction;
(8) and (3) dragging distance test: selecting a stable magnetic field interference-free area, carrying out a marine magnetometer dragging distance test, throwing the marine magnetometer into the sea, keeping the position of the marine magnetometer still, sailing a working ship to a distance by taking the throwing position of the marine magnetometer as a starting point, observing the change of magnetic measurement data, and setting the optimal dragging distance when the magnetic measurement data are stable and unchanged;
(9) connecting equipment: connecting all equipment on a deck of a working ship, fixing the marine magnetometer and the buoy, starting the marine magnetometer until signals are stable, and putting the marine magnetometer after magnetic measurement data do not jump;
(10) synchronization time: before measurement is started, time synchronization is carried out on the marine magnetometer, the marine magnetic method acquisition system and the navigation system;
(11) and (3) navigation measurement: the working ship is subjected to navigation measurement along a measuring line, the time interval for acquiring observation data is 0.2-5 s, the navigation speed is gradually increased to the normal measurement navigation speed for 3-6 knots, and the working ship keeps running at a constant speed; in the process of navigation measurement, monitoring the constant stress of the communication cable, finding that the communication cable is abnormally stressed and immediately decelerating, and recovering the ocean magnetometer; in the process of navigation measurement, when signal interruption is found, the speed is reduced immediately, and the marine magnetometer is recovered;
(12) laying a connecting line: laying a connecting line as the measurement work is carried out, and checking the measurement precision of the magnetic method by using the connecting line as the marine magnetic method measurement quality checking work, wherein the connecting line is a measurement line which is distributed in a cross way with a normal measurement line;
(13) and (4) finishing the measurement: after returning to the correction point, finishing the measurement work of the ocean magnetic method, then processing data, and respectively carrying out daily variation correction, normal field correction and elevation correction on the original data to obtain a delta T magnetic abnormal value;
(14) magnetic data processing and conversion: the method comprises the following steps of (1) carrying out kriging gridding on delta T abnormal data; calculating an abnormal delta T electrode; thirdly, converting the diagram of the delta T abnormity;
(15) writing a report: and deducing a geological structure according to the graph, delineating the magnetic abnormal body and compiling a result report.
CN202010353405.9A 2020-04-29 2020-04-29 Ocean magnetic method measuring system and application thereof Pending CN111580168A (en)

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CN113064211A (en) * 2021-03-25 2021-07-02 国家海洋信息中心 Curie surface depth calculation method based on ocean magnetic force abnormal wavelet transform
CN113447864A (en) * 2021-06-22 2021-09-28 中国船舶重工集团公司第七0七研究所 System and method for automatically retracting and releasing magnetometer for ocean surveying unmanned ship
CN114089431A (en) * 2021-11-18 2022-02-25 海南省海洋地质调查研究院 Method for determining optimal streamer length of marine magnetometer in marine magnetic measurement
CN114578438A (en) * 2022-05-05 2022-06-03 成都理工大学 Electromagnetic detection system for self-adaptive water area
CN115166856A (en) * 2022-07-12 2022-10-11 中国自然资源航空物探遥感中心 Unmanned ship weight magnetic measurement method, system, equipment and computer readable storage medium

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