CN115877468A - Noise-resistant seabed differential electrode system data acquisition method, device and terminal - Google Patents

Noise-resistant seabed differential electrode system data acquisition method, device and terminal Download PDF

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CN115877468A
CN115877468A CN202110941166.3A CN202110941166A CN115877468A CN 115877468 A CN115877468 A CN 115877468A CN 202110941166 A CN202110941166 A CN 202110941166A CN 115877468 A CN115877468 A CN 115877468A
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electrodes
electric field
target
noise
correlation coefficient
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吴梦影
何展翔
侯宇健
应志奇
幺永超
袁慧
沈义斌
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Southern University of Science and Technology
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Southern University of Science and Technology
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Abstract

The application is suitable for the field of signal processing, and provides a noise-resistant data acquisition method, a noise-resistant data acquisition device and a noise-resistant data acquisition terminal for a submarine differential electrode system. The noise-resistant seabed differential electrode system data acquisition method specifically comprises the following steps: determining a correlation coefficient between every two electric field intensities of at least three electrodes at a target moment, the at least three electrodes being arranged in the same direction; determining whether an electrode causing signal noise exists in the at least three electrodes at the target time based on the correlation coefficient. The embodiment of the application can identify whether the electrode causing the signal noise exists at the target moment, so that the detection of the signal noise is realized, and the problem that the data analysis accuracy is reduced when the electric field signal data provided by the electrode causing the signal noise is used for carrying out data analysis is solved.

Description

Noise-resistant seabed differential electrode system data acquisition method, device and terminal
Technical Field
The application belongs to the field of signal processing, and particularly relates to a noise-resistant seabed differential electrode system data acquisition method, a noise-resistant seabed differential electrode system data acquisition device and a noise-resistant seabed differential electrode system data acquisition terminal.
Background
Marine controlled source electromagnetic surveying, similar to seismic surveying, is a method for achieving active target surveying by artificially exciting electromagnetic fields and receiving electromagnetic signals by a signal acquisition system located on the seafloor. The ocean controllable source electromagnetic exploration technology can determine whether trap (trap) contains oil gas (oil gas) or not and indicate the trap boundary containing oil gas, so that the success rate of oil gas exploration is improved, and the method becomes one of important means of ocean oil gas exploration at present.
The current marine controllable source electromagnetic exploration technology mainly adopts two modes when data acquisition is carried out. One is to use a mobile streamer signal acquisition system. The other method is to put a fixed-release type signal acquisition system on the seabed which is a research target, and the signal acquisition system acquires field source signals reflected by seabed media, and the method is the mainstream method for acquiring the electromagnetic exploration data of the ocean controllable source at present.
The conventional fixed-drop signal acquisition system generally comprises a box body, a controller, a detection assembly and a buoyancy regulating assembly. The detection assembly mainly comprises an electric field sensor, a magnetic field sensor, a connecting part and the like, wherein the electric field sensor mainly comprises two groups of mutually orthogonal submarine electric field detection electrodes. After the signal acquisition system is thrown to the seabed, the voltage between each group of detection electrodes and the change trend of the voltage along with time can be measured, so that the electric field intensity changes in two orthogonal observation directions are obtained, and the required ocean electric field signal is obtained.
However, when two groups of detection electrodes on the signal acquisition system measure the potential on the seabed, current may pass through the detection electrodes, so that the detection electrodes are polarized. A large amount of signal noise often exists in ocean electric field signals acquired by the polarization-based detection electrode. Therefore, the electric field signal acquired by the existing data acquisition mode has high noise level and poor stability, useful information is difficult to identify, and difficulty is often brought to subsequent data analysis.
Disclosure of Invention
The embodiment of the application provides a noise-resistant submarine differential electrode system data acquisition method, a noise-resistant submarine differential electrode system data acquisition device and a noise-resistant submarine differential electrode system terminal, which can identify whether an electrode causing signal noise exists at a target moment, realize the detection of the signal noise and avoid the problem of reduced data analysis accuracy when data analysis is carried out by using electric field signal data provided by the electrode causing the signal noise.
The embodiment of the application provides a noise-resistant data acquisition method for a submarine differential electrode system, which comprises the following steps:
determining a correlation coefficient between every two electric field intensities of at least three electrodes at a target moment, the at least three electrodes being arranged in the same direction;
determining whether an electrode causing signal noise exists in the at least three electrodes at the target time based on the correlation coefficient.
A noise-resistant data acquisition device for a subsea differential electrode system according to a second aspect of the embodiments of the present application includes:
a determination unit for determining a correlation coefficient between every two electric field intensities of at least three electrodes at a target time, the at least three electrodes being arranged in a same direction;
a detection unit for determining whether an electrode causing signal noise exists in the at least three electrodes at the target time based on the correlation coefficient.
A third aspect of the embodiments of the present application provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method when executing the computer program.
A fourth aspect of the embodiments of the present application provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the above method.
A fifth aspect of embodiments of the present application provides a computer program product, which when run on a terminal, causes the terminal to perform the steps of the method.
In the embodiment of the application, the correlation coefficient between every two electric field intensities in the electric field intensities of the at least three electrodes at the target moment is determined, and whether the electrode causing the signal noise exists in the at least three electrodes at the target moment is determined based on the correlation coefficient, so that whether the electrode causing the signal noise exists at the target moment can be identified, the detection of the signal noise is realized, and the problem that the data analysis accuracy is reduced when the data analysis is carried out by using the electric field signal data provided by the electrode causing the signal noise can be avoided. The anti-noise seabed differential electrode system data acquisition method is applied to the ocean controllable source electromagnetic exploration technology, the influence of signal noise caused by electrodes with poor polarization or contact on electric field signal analysis can be effectively avoided, and the accuracy of the ocean controllable source electromagnetic exploration can be improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of an implementation of a noise-resistant data acquisition method for a subsea differential electrode system according to an embodiment of the present application;
fig. 2 is a schematic diagram of a signal acquisition system provided in an embodiment of the present application;
fig. 3 is a schematic diagram of a specific implementation flow for determining a correlation coefficient between a first electric field strength and a second electric field strength according to an embodiment of the present application;
FIG. 4 is a flowchart illustrating an embodiment of the present application for determining whether an electrode causing signal noise exists in three target electrodes at a target time;
fig. 5 is a schematic structural diagram of a noise-resistant data acquisition device of a subsea differential electrode system according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall be protected by the present application.
Marine controlled source electromagnetic prospecting, similar to seismic prospecting, is a method of achieving active target prospecting by artificially exciting an electromagnetic field and receiving electromagnetic signals by a signal acquisition system located at the sea floor. The marine controllable source electromagnetic exploration technology can determine whether trap (trap) contains oil gas (oil gas) and indicate the trap boundary containing oil gas, so that the success rate of oil gas exploration is improved, and the marine controllable source electromagnetic exploration technology becomes one of the important means of the current marine oil gas exploration.
The current marine controllable source electromagnetic exploration technology mainly adopts two modes when acquiring data: one is to use a mobile streamer signal acquisition system. The other method is to put a fixed-release type signal acquisition system on the seabed as a research target, and the signal acquisition system acquires field source signals reflected by seabed media, which is the mainstream method for acquiring the current marine controllable source electromagnetic exploration data.
The conventional fixed-drop signal acquisition system generally comprises a box body, a controller, a detection assembly and a buoyancy regulating assembly. The detection assembly mainly comprises an electric field sensor, a magnetic field sensor, a connecting part and the like, wherein the electric field sensor mainly comprises two groups of mutually orthogonal submarine electric field detection electrodes. After the signal acquisition system is thrown into the seabed, the voltage between each group of detection electrodes and the change trend of the voltage along with time can be measured, so that the electric field intensity change in two orthogonal observation directions is obtained, and the required ocean electric field signal is obtained.
However, when two groups of detection electrodes on the signal acquisition system measure the potential on the seabed, current may pass through the detection electrodes, so that the detection electrodes are polarized. A large amount of signal noise often exists in ocean electric field signals acquired by the polarization-based detection electrode. Therefore, the electric field signal acquired by the existing data acquisition mode has high noise level and poor stability, useful information is difficult to identify, and difficulty is often brought to subsequent data analysis.
In order to explain the technical means of the present application, the following description will be given by way of specific examples.
Fig. 1 shows a schematic implementation flow diagram of a noise-resistant subsea differential electrode system data acquisition method provided in an embodiment of the present application, where the method can be applied to a terminal, and is applicable to a situation where signal noise needs to be detected and data analysis accuracy of an electric field signal is improved.
The terminal can be a computer, a signal acquisition system with certain computing capacity, or other equipment for marine controllable source electromagnetic exploration.
Specifically, the noise-resistant subsea differential electrode system data acquisition method may include the following steps S101 to S102.
Step S101, determining a correlation coefficient between every two electric field intensities in the electric field intensities of at least three electrodes at the target moment.
The at least three electrodes are arranged along the same direction, and the target time can be any one or more sampling times of the electrodes for collecting the electric field signals.
In the embodiment of the present application, an electric field strength exists between each two electrodes of the at least three electrodes, and a correlation coefficient may be determined between the two electric field strengths calculated based on different electrodes, and the correlation coefficient may be used to indicate a linear correlation degree between the two electric field strengths in the time dimension. By studying the correlation coefficient corresponding to the target time, the terminal can determine whether an electrode causing signal noise exists at the target time.
Step S102, determining whether an electrode causing signal noise exists in at least three electrodes at the target moment based on the correlation coefficient.
Specifically, in some embodiments of the present application, the terminal may select three target electrodes from the at least three electrodes, and the selected three target electrodes may be any three electrodes of the at least three electrodes.
Next, in some embodiments of the present application, based on a correlation coefficient between every two electric field intensities of the three target electrodes at the target time, it may be determined whether an electrode causing signal noise is present among the three target electrodes at the target time.
The three target electrodes may be three electrodes arranged in a first direction on the signal acquisition system, or may also be three electrodes arranged in a second direction orthogonal to the first direction on the signal acquisition system.
In order to reduce the hardware cost, one of the three target electrodes is an electrode arranged on the intersection point of the first direction and the second direction on the signal acquisition system.
That is, as shown in fig. 2, the signal acquisition system includes a pair of electrodes respectively located in the first direction
Figure BDA0003214912780000061
And &>
Figure BDA0003214912780000062
And another pair of electrodes +in a second direction orthogonal to the first direction>
Figure BDA0003214912780000063
And &>
Figure BDA0003214912780000064
It may further include a center electrode N positioned at an intersection of the first direction and the second direction so as to intersect each otherThe phases form a differential electrode system. Wherein the central electrode N can be coupled to a pair of electrodes in a first direction>
Figure BDA0003214912780000065
And &>
Figure BDA0003214912780000066
Three target electrodes may be combined, or the combination may be combined with another pair of electrodes located in a second direction orthogonal to the first direction>
Figure BDA0003214912780000067
And &>
Figure BDA0003214912780000068
Three target electrodes are formed, so that the signal noise detection of each electrode in the first direction and the second direction which are orthogonal to each other is realized while the number of electrodes on a signal acquisition system is saved. It should be noted that each electrode on the signal acquisition system is a ground electrode.
With electrodes in FIG. 2
Figure BDA0003214912780000069
And electrode->
Figure BDA00032149127800000610
The direction x is taken as an example as a first direction, in which the long electrode pair is formed>
Figure BDA00032149127800000611
Short electrode pair>
Figure BDA00032149127800000612
And a short electrode pair>
Figure BDA00032149127800000613
Three electric field measuring electrode systems, all of which can be used to characterize the electric field strength E in the first direction x x 。
Specifically, the electric field strength measured by each electric field measuring electrode system is respectively:
Figure BDA00032149127800000614
and->
Figure BDA00032149127800000615
Wherein
Figure BDA00032149127800000616
V N Respectively represent an electrode->
Figure BDA00032149127800000617
Electrode->
Figure BDA00032149127800000618
And the potential of the buried point of the electrode N,
Figure BDA00032149127800000619
respectively representing the polar distance length between two corresponding electrodes of each electric field measuring electrode system.
After obtaining the corresponding electric field strength of each electric field measuring electrode system, the correlation coefficient between the two electric field strengths can be determined based on each two electric field strengths.
Specifically, as shown in fig. 3, in some embodiments of the present application, in the step of determining the correlation coefficient between every two of the electric field strengths of the at least three electrodes at the target time, the step of determining the correlation coefficient between the first electric field strength and the second electric field strength of the at least three electrodes at the target time may include the following steps S301 to S302.
In step S301, a first electric field intensity average value of the first electric field intensity for n times and a second electric field intensity average value of the second electric field intensity for n times are calculated.
The n times may be sampling times of the electrode potentials, and may specifically include the target time. The first electric field strength is an electric field strength between two of the at least three electrodes, and the second electric field strength is an electric field strength between two of the at least three electrodes different from the at least one electrode corresponding to the first electric field strength. That is, the first electric field strength and the second electric field strength are different electric field strengths measured by the electric field measuring electrode system.
In some embodiments of the present application, a first electric field strength and a second electric field strength may be obtained at each of the n time instants, and a first electric field strength average of the first electric field strength at the n time instants and a second electric field strength average of the second electric field strength at the n time instants may be determined based on the first electric field strength and the second electric field strength corresponding to each of the n time instants.
In step S302, a correlation coefficient between the first electric field strength and the second electric field strength at the target time is calculated according to the first electric field strength average value, the second electric field strength average value, the first electric field strength at the target time and the second electric field strength at the target time.
Specifically, the correlation coefficient between the first electric field strength and the second electric field strength
Figure BDA0003214912780000071
Wherein,
Figure BDA0003214912780000072
k and L respectively represent different electric field measuring electrode systems; i is a time sampling sequence number; />
Figure BDA0003214912780000073
Is the average value of the corresponding first electric field intensity in n time instants, i.e. the first electric field intensity E when i is equal to 1 to n K (x i ) Average value of (d);
Figure BDA0003214912780000074
is the average value of the corresponding second electric field intensity in n time instants, i.e. the second electric field intensity E when i is equal to 1 to n L (x i ) Average value of (d); d i Is namely E K (x i ) And E L (x i ) Normalized number betweenAccording to the difference. Coefficient of correlation R i The value of (c) is in the range of (-1, + 1).
In an embodiment of the present application, R i The larger the absolute value of (A), the larger the degree of correlation between the first electric field strength and the second electric field strength, R i The smaller the absolute value of (b) is, the smaller the degree of correlation between the first electric field strength and the second electric field strength is. Thus, according to R i Can identify noisy data caused by polarization or poor contact.
Assume the above
Figure BDA0003214912780000081
Is shown as E 1 、/>
Figure BDA0003214912780000082
Is represented by E 2 And & ->
Figure BDA0003214912780000083
Is represented by E 3 Then based on the method shown in FIG. 3, E can be calculated 1 And E 2 Coefficient of correlation between R i (E 1 ，E 2 )、E 1 And E 3 Coefficient of correlation between R i (E 1 ，E 3 ) And E 2 And E 3 Coefficient of correlation between R i (E 2 ，E 3 )。
Next, as shown in fig. 4, in some embodiments of the present application, the above determining whether an electrode causing signal noise exists in the three target electrodes at the target time based on a correlation coefficient between every two electric field intensities in the electric field intensities of the three target electrodes at the target time may include the following steps S401 to S402.
In step S401, it is detected whether or not there is a correlation coefficient smaller than a correlation coefficient threshold value in the correlation coefficients between every two electric field intensities in the electric field intensities of the three target electrodes at the target time.
The correlation coefficient threshold may be adjusted according to actual conditions, and in some embodiments of the present application, the correlation coefficient threshold may be 0.6 or 0.8, and the like.
In step S402, if there is a correlation coefficient smaller than a correlation coefficient threshold value in the correlation coefficients between every two electric field intensities in the electric field intensities of the three target electrodes at the target time, it is determined that there is an electrode causing signal noise in the three target electrodes.
In some embodiments of the present application, when there is no correlation coefficient, i.e., R, smaller than a correlation coefficient threshold value among correlation coefficients between every two electric field intensities of the three target electrodes at the target time i (E 1 ，E 2 )、R i (E 1 ，E 3 ) And R i (E 2 ，E 3 ) Are all larger than the threshold value of the correlation coefficient, and indicate E within n moments 1 、E 2 And E 3 The inter-correlation is high, which means that no polarization or poor contact occurs in each electrode, the change of the electric field intensity between the electrodes with time is basically the same, and no signal noise occurs in the electric field signal, so that the terminal can confirm that no electrode causing signal noise exists in the three target electrodes. When there is a correlation coefficient smaller than a correlation coefficient threshold value, namely R, in the correlation coefficient between every two electric field intensities in the electric field intensities of the three target electrodes at the target time i (E 1 ，E 2 )、R i (E 1 ，E 3 ) And R i (E 2 ，E 3 ) In the presence of at least one correlation coefficient R i When the correlation coefficient is smaller than the correlation coefficient threshold, it is indicated that the correlation between the two electric field strengths corresponding to the correlation coefficient smaller than the correlation coefficient threshold within n moments is low, which indicates that at least one of the electric field strengths is subjected to signal interference, where the signal interference may be caused by polarization or poor contact of at least one of the two electrodes corresponding to the electric field strength, the changes of the electric field strengths between the electrodes with time are different, and signal noise occurs in the electric field signal, so that the terminal can confirm that an electrode causing the signal noise exists in the three target electrodes.
More specifically, if there are one correlation coefficient greater than or equal to the correlation coefficient threshold value and two correlation coefficients less than the correlation coefficient threshold value among the correlation coefficients between every two electric field intensities of the three target electrodes at the target time, the target electrodes other than the two target electrodes corresponding to the correlation coefficient greater than or equal to the correlation coefficient threshold value among the three target electrodes may be used as the electrodes causing the signal noise.
For example, if the polarization of the central electrode N in fig. 2 occurs after the central electrode N is turned on, which causes signal noise interference (this phenomenon generally exists in the early stage of signal acquisition, and then the noise disappears as the polarization gradually stabilizes), the electric field strength associated with the central electrode N is subjected to similar signal interference at each sampling time in the corresponding time period, and the changes are substantially the same, so that the correlation coefficient R between the two electric field strengths associated with the central electrode N i Greater than or equal to a correlation coefficient threshold, i.e. R i (E 1 ，E 2 ) Is relatively large. Due to E 3 Independent of the central electrode N, without signal interference from the central electrode N, E 3 And E 1 Or E 3 And E 2 Are different from one another, and therefore, R i (E 1 ，E 3 ) And R i (E 2 ，E 3 ) Less than the correlation coefficient threshold, i.e., not correlated. Therefore, the terminal can use the center electrode N as an electrode causing signal noise according to the correlation coefficient.
Similarly, if the central electrode N begins to contact poorly at a certain time, which results in signal noise (generally, the signal acquisition system is better in early signal after being put into the sea bottom, and the electrode has a problem of poor contact due to some reason after being used for a certain period of time), the electric field strength associated with the central electrode N is disturbed by similar signals and shows substantially the same change from each sampling time after the time, and therefore, the correlation coefficient R between the two electric field strengths associated with the central electrode N is substantially the same i Greater than or equal to a correlation coefficient threshold, i.e. R i (E 1 ，E 2 ) Is relatively large. Due to E 3 Independent of the central electrode N, without signal interference from the central electrode N, then E 3 And E 1 Or E 3 And E 2 Are not the same, and therefore, R i (E 1 ，E 3 ) And R i (E 2 ，E 3 ) Less than the correlation coefficient threshold, i.e., not correlated. Therefore, the terminal can use the center electrode N as an electrode causing signal noise according to the correlation coefficient.
As is apparent from the above description, in some embodiments of the present application, an electrode in which signal noise is caused may be determined based on a correlation coefficient between each two electric field strengths of the three target electrodes.
In other embodiments of the present application, if the correlation coefficient between every two electric field intensities of the three target electrodes at the target time is smaller than the correlation coefficient threshold, it indicates that at least two electrodes causing signal noise exist in the three target electrodes.
In the above description, a specific implementation of the electrode for detecting signal noise is described by taking three target electrodes disposed in the x direction of the first direction as an example, and the y direction (i.e., the electrode) of the second direction is described by taking the three target electrodes as an example
Figure BDA0003214912780000101
And electrode->
Figure BDA0003214912780000102
Listening direction), the specific implementation manner of detecting the electrode causing the signal noise is the same as the detection manner of detecting the three target electrodes arranged in the first direction x direction, which is not described herein again.
And when the number of the electrodes arranged in the first direction x direction or the second direction y direction is greater than three, the terminal may first select any three electrodes, detect whether there is an electrode causing signal noise, reselect different three electrodes, detect whether there is an electrode causing signal noise, and so on until all the electrode combination modes are detected, to obtain whether there is an electrode causing signal noise in the plurality of electrodes, or further determine which electrode is the electrode causing signal noise in the plurality of electrodes.
In the embodiment of the application, the correlation coefficient between every two electric field intensities in the electric field intensities of the at least three electrodes at the target moment is determined, and whether the electrode causing the signal noise exists in the at least three electrodes at the target moment is determined based on the correlation coefficient, so that whether the electrode causing the signal noise exists at the target moment can be identified, the detection of the signal noise is realized, and the problem that the data analysis accuracy is reduced when the data analysis is carried out by using the electric field signal data provided by the electrode causing the signal noise is avoided. The noise-resistant seabed differential electrode system data acquisition method is applied to the technology of marine controllable source electromagnetic exploration, the influence of signal noise caused by polarized or poorly contacted electrodes on electric field signal analysis can be effectively avoided, and the accuracy of marine controllable source electromagnetic exploration can be improved.
Moreover, based on the signal noise detection at a plurality of target moments, the time boundary between the occurrence and the termination of the noise can be quantitatively identified, namely, the specific time period of the occurrence of the polarization or the poor contact can be judged.
In order to maintain the synchronicity of time, in some embodiments of the present application, after determining whether an electrode causing signal noise is present among the at least three electrodes at the target time, if an electrode causing signal noise is present among the at least three electrodes at the target time, the electric field strength associated with the electrode causing signal noise at the target time among the at least three electrodes is replaced with the electric field strength associated with the electrode not causing signal noise at the target time among the at least three electrodes.
In some embodiments of the present application, the terminal may replace the electric field intensity between two electrodes with at least one electrode being polarized or having poor contact at the target time by using the electric field intensity between two electrodes with no polarization and poor contact at the target time. That is, the terminal may replace the electric field data having the signal noise with the electric field data having no signal noise at the same time, so that the electric field data having the signal noise may be prevented from being used when analyzing the electric field data at the target time.
Assuming the center electrode N is polarized as described above, the center electrode is determinedPole N at sample time t a To t b Polarization takes place, the sampling time t can be used a To t b Corresponding to
Figure BDA0003214912780000111
Instead of dropping the sampling time t a To t b Corresponding->
Figure BDA0003214912780000112
And &>
Figure BDA0003214912780000113
According to the embodiment of the application, the measured electric field signals can be subjected to correlation analysis, signal noise generated by electrode polarization and poor contact between the electrodes can be identified, the signal noise can be eliminated in a data substitution mode, and the data quality is improved.
It should be noted that, for simplicity of description, the foregoing method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts, as some steps may, in accordance with the present application, occur in other orders.
Fig. 5 is a schematic structural diagram of a noise-resistant subsea differential electrode system data acquisition device 500 according to an embodiment of the present disclosure, where the noise-resistant subsea differential electrode system data acquisition device 500 is disposed on a terminal. The terminal can be a computer, a signal acquisition system with certain computing capacity, or other equipment for marine controllable source electromagnetic exploration.
Specifically, the noise-resistant subsea differential electrode system data acquisition device 500 may include:
a determination unit 501 for determining a correlation coefficient between every two electric field intensities of at least three electrodes at a target moment, the at least three electrodes being arranged in the same direction;
a detecting unit 502, configured to determine whether an electrode causing signal noise exists in the at least three electrodes at the target time based on the correlation coefficient.
In some embodiments of the present application, the detection unit 502 may be specifically configured to: determining whether an electrode causing signal noise is present among three target electrodes at the target time, which are any three electrodes among the at least three electrodes, based on a correlation coefficient between every two electric field intensities among the electric field intensities of the three target electrodes at the target time.
In some embodiments of the present application, the three target electrodes are three electrodes disposed along a first direction on the signal acquisition system, or the three target electrodes are three electrodes disposed along a second direction orthogonal to the first direction on the signal acquisition system.
In some embodiments of the present application, one of the three target electrodes is an electrode disposed on the signal acquisition system at an intersection of the first direction and the second direction.
In some embodiments of the present application, the detecting unit 502 may be specifically configured to: detecting whether a correlation coefficient smaller than a correlation coefficient threshold value exists in correlation coefficients between every two electric field intensities in the electric field intensities of the three target electrodes at the target moment; and if a correlation coefficient smaller than the threshold value exists in the correlation coefficient between every two electric field intensities in the electric field intensities of the three target electrodes at the target moment, determining that an electrode causing signal noise exists in the three target electrodes.
In some embodiments of the present application, when the determining unit 501 determines the correlation coefficient between the first electric field strength and the second electric field strength of the at least three electrodes at the target time, it may specifically be configured to: calculating a first electric field intensity average value of the first electric field intensity in n time instants and a second electric field intensity average value of the second electric field intensity in the n time instants, wherein the n time instants comprise the target time instant; calculating a correlation coefficient between the first electric field strength and the second electric field strength at the target time based on the first electric field strength average, the second electric field strength average, the first electric field strength at the target time, and the second electric field strength at the target time.
In some embodiments of the present application, the noise-immune subsea differential electrode system data acquisition device 500 may further comprise a data replacement unit, which may be configured to: if there is an electrode causing signal noise among the at least three electrodes at the target time, replacing an electric field strength associated with an electrode causing signal noise at the target time among the at least three electrodes with an electric field strength associated with an electrode not causing signal noise at the target time among the at least three electrodes.
It should be noted that, for convenience and brevity of description, the specific working process of the noise-resistant subsea differential electrode system data acquisition device 500 may refer to the corresponding process of the method described in fig. 1 to fig. 4, and is not described herein again.
Fig. 6 is a schematic diagram of a terminal according to an embodiment of the present application. The terminal can be a computer, a signal acquisition system with certain computing capacity, or other equipment for marine controllable source electromagnetic exploration.
The terminal 6 may include: a processor 60, a memory 61 and a computer program 62 stored in said memory 61 and executable on said processor 60, such as a noise immune subsea differential electrode system data acquisition program. The processor 60, when executing the computer program 62, implements the steps in each of the noise immune subsea differential electrode system data acquisition method embodiments described above, such as steps S101 to S102 shown in fig. 1. Alternatively, the processor 60, when executing the computer program 62, implements the functions of the modules/units in the device embodiments, such as the determining unit 501 and the detecting unit 502 shown in fig. 5.
The computer program may be divided into one or more modules/units, which are stored in the memory 61 and executed by the processor 60 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program in the terminal.
For example, the computer program may be divided into: a determination unit and a detection unit. The specific functions of each unit are as follows: a determination unit for determining a correlation coefficient between every two electric field intensities of at least three electrodes at a target moment, the at least three electrodes being arranged in a same direction; a detection unit for determining whether an electrode causing signal noise exists in the at least three electrodes at the target time based on the correlation coefficient.
The terminal may include, but is not limited to, a processor 60, a memory 61. Those skilled in the art will appreciate that fig. 6 is merely an example of a terminal and is not intended to be limiting and may include more or fewer components than those shown, or some of the components may be combined, or different components, e.g., the terminal may also include input-output devices, network access devices, buses, etc.
The Processor 60 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 61 may be an internal storage unit of the terminal, such as a hard disk or a memory of the terminal. The memory 61 may also be an external storage device of the terminal, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal. Further, the memory 61 may also include both an internal storage unit and an external storage device of the terminal. The memory 61 is used for storing the computer programs and other programs and data required by the terminal. The memory 61 may also be used to temporarily store data that has been output or is to be output.
It should be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional units and modules is only used for illustration, and in practical applications, the above function distribution may be performed by different functional units and modules as needed, that is, the internal structure of the apparatus may be divided into different functional units or modules to perform all or part of the above described functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described or recited in any embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer-readable medium may contain suitable additions or subtractions depending on the requirements of legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer-readable media may not include electrical carrier signals or telecommunication signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present application, and they should be construed as being included in the present application.

Claims (10)

1. A noise-resistant data acquisition method for a submarine differential electrode system is characterized by comprising the following steps:
determining a correlation coefficient between every two electric field intensities in the electric field intensities of at least three electrodes at a target moment, wherein the at least three electrodes are arranged along the same direction;
determining whether an electrode causing signal noise exists in the at least three electrodes at the target time based on the correlation coefficient.
2. The noise-resilient subsea differential electrode system data acquisition method according to claim 1, wherein said determining, based on said correlation coefficients, whether an electrode causing signal noise is present in said at least three electrodes at said target time comprises:
determining whether an electrode causing signal noise is present among three target electrodes at the target time, which are any three electrodes among the at least three electrodes, based on a correlation coefficient between every two electric field intensities among the electric field intensities of the three target electrodes at the target time.
3. The noise-resilient seafloor differential electrode system data collection method of claim 2, wherein the three target electrodes are three electrodes disposed on the signal collection system along a first direction, or the three target electrodes are three electrodes disposed on the signal collection system along a second direction orthogonal to the first direction.
4. The noise immune subsea differential electrode system data acquisition process according to claim 3, wherein one of said three target electrodes is an electrode on said signal acquisition system disposed at the intersection of said first direction and said second direction.
5. The noise immune subsea differential electrode system data collection method according to any of claims 2-4, wherein said determining whether an electrode causing signal noise is present in said three target electrodes at said target time based on a correlation coefficient between every two electric field strengths of the electric field strengths of said three target electrodes at said target time comprises:
detecting whether a correlation coefficient smaller than a correlation coefficient threshold value exists in correlation coefficients between every two electric field intensities in the electric field intensities of the three target electrodes at the target moment;
and if the correlation coefficient smaller than the threshold value exists in the correlation coefficient between every two electric field intensities in the electric field intensities of the three target electrodes at the target moment, determining that an electrode causing signal noise exists in the three target electrodes.
6. The noise immune subsea differential electrode system data collection method of claim 5, wherein in said step of determining the correlation coefficient between each two of the electric field strengths of the at least three electrodes at a target time, the step of determining the correlation coefficient between the first and second electric field strengths of the at least three electrodes at the target time comprises:
calculating a first electric field intensity average value of the first electric field intensity in n time instants and a second electric field intensity average value of the second electric field intensity in the n time instants, wherein the n time instants comprise the target time instant;
calculating a correlation coefficient between the first electric field strength and the second electric field strength at the target time based on the first electric field strength average, the second electric field strength average, the first electric field strength at the target time, and the second electric field strength at the target time.
7. The noise immune subsea differential electrode system data acquisition method of any of claims 1-4, further comprising:
and if the electrodes causing the signal noise exist in the at least three electrodes at the target moment, replacing the electric field intensity associated with the electrodes causing the signal noise at the target moment in the at least three electrodes with the electric field intensity associated with the electrodes not causing the signal noise at the target moment in the at least three electrodes.
8. A noise-resistant data acquisition device of a seabed differential electrode system is characterized by comprising:
a determination unit for determining a correlation coefficient between every two electric field intensities of at least three electrodes at a target time, the at least three electrodes being arranged in a same direction;
a detection unit for determining whether an electrode causing signal noise exists in the at least three electrodes at the target time based on the correlation coefficient.
9. A terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
CN202110941166.3A 2021-08-17 2021-08-17 Noise-resistant seabed differential electrode system data acquisition method, device and terminal Pending CN115877468A (en)

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