CN111812719A - Method and system for acquiring polarization information of underground medium - Google Patents
Method and system for acquiring polarization information of underground medium Download PDFInfo
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- CN111812719A CN111812719A CN202010418696.5A CN202010418696A CN111812719A CN 111812719 A CN111812719 A CN 111812719A CN 202010418696 A CN202010418696 A CN 202010418696A CN 111812719 A CN111812719 A CN 111812719A
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- G01V3/08—Electric 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
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Abstract
The method obtains polarization information of the underground medium based on a frequency domain electromagnetic method, namely firstly obtaining magnetic field parameters of a first magnetic field and magnetic field parameters of a second magnetic field in a preset space, then respectively decomposing the magnetic field parameters of the first magnetic field and the second magnetic field to obtain secondary magnetic field parameters of the first magnetic field and secondary magnetic field parameters of the second magnetic field, and finally calculating the induced polarization information of the underground medium according to the secondary magnetic field parameters of the first magnetic field and the secondary magnetic field parameters of the second magnetic field, does not need to be in contact with the ground, does not need to manually set a copper electrode inserted into the ground, only forms a magnetic field through a coil, and can obtain the induced polarization information of the underground medium by processing and calculating the magnetic field parameters, and is also applicable to some special regions, thereby improving the polarization information obtaining efficiency, the labor cost for acquiring the polarization information is reduced, and the applicability of the method is improved.
Description
Technical Field
The application relates to the technical field of geological exploration, in particular to a method and a system for acquiring polarization information of underground media.
Background
Induced Polarization Method (Induced Polarization Method) is the best detection Method applied in metal ore exploration at present.
At present, when the traditional excitation planning method is used for measuring the polarization information of the underground medium, a field acquisition method of a direct current electrode is needed, namely field workers need to manually insert copper electrodes into the ground, and the polarization rate is obtained by continuously measuring the potential difference between the two copper electrodes. The working mode is time-consuming and labor-consuming, and has poor applicability in some areas with high grounding resistance and poor ground trafficability.
Disclosure of Invention
In order to solve the technical problems, the application provides an acquisition method and an acquisition system for polarization information of an underground medium, so as to achieve the purposes of improving the acquisition efficiency of the polarization information of the underground medium, reducing the labor cost for acquiring the polarization information of the underground medium, and improving the applicability of the acquisition method for the polarization information of the underground medium.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
a method for acquiring polarization information of a subsurface medium comprises the following steps:
acquiring magnetic field parameters of a first magnetic field and magnetic field parameters of a second magnetic field in a preset space, wherein the frequencies of the first magnetic field and the second magnetic field are different;
decomposing the magnetic field parameters of the first magnetic field to obtain secondary magnetic field parameters of the first magnetic field;
decomposing the magnetic field parameters of the second magnetic field to obtain secondary magnetic field parameters of the second magnetic field;
and calculating the induced polarization information of the underground medium according to the secondary magnetic field parameters of the first magnetic field and the secondary magnetic field parameters of the second magnetic field.
Optionally, the calculating induced polarization information of the subsurface medium according to the secondary magnetic field parameter of the first magnetic field and the secondary magnetic field parameter of the second magnetic field includes:
substituting the secondary magnetic field parameters of the first magnetic field and the secondary magnetic field parameters of the second magnetic field into a first preset formula to calculate and obtain induced polarization information of the underground medium;
the first preset formula includes:
wherein DIP represents induced polarization information of the subsurface medium, Bs(f1) Denotes the secondary magnetic field parameter of the first magnetic field, Imag [ B ]s(f1)]An imaginary part, B, of a secondary magnetic field parameter representing the first magnetic fields(f2) A secondary magnetic field parameter, Imag [ B ], representing the second magnetic fields(f2)]Represents the imaginary part of the secondary magnetic field parameter of the second magnetic field, f represents the frequency of the first magnetic field, f2Representing the frequency of the second magnetic field.
Optionally, the obtaining the magnetic field parameter of the first magnetic field and the magnetic field parameter of the second magnetic field in the preset space includes:
in the preset space, a transmitting coil is used for transmitting a first magnetic line of force so as to enable the first magnetic line of force to react with the underground medium to generate a first magnetic field, and a receiving coil is used for receiving magnetic field parameters of the first magnetic field;
and in the preset space, a second magnetic line is transmitted by using the transmitting coil so as to enable the second magnetic line to react with the underground medium to generate a second magnetic field, and the receiving coil is used for receiving the magnetic field parameters of the second magnetic field.
Optionally, the decomposing the magnetic field parameter of the first magnetic field to obtain the secondary magnetic field parameter of the first magnetic field includes:
decomposing the magnetic field parameters of the first magnetic field into a primary magnetic field of the first magnetic field and a secondary magnetic field of the first magnetic field such that the sum of the primary magnetic field of the first magnetic field and the secondary magnetic field of the first magnetic field is equal to the magnetic field parameters of the first magnetic field.
Optionally, the respectively performing the magnetic field parameters of the second magnetic field to obtain the secondary magnetic field parameters of the second magnetic field includes:
decomposing the magnetic field parameters of the second magnetic field into a primary magnetic field of the second magnetic field and a secondary magnetic field of the second magnetic field such that the sum of the primary magnetic field of the second magnetic field and the secondary magnetic field of the second magnetic field is equal to the magnetic field parameters of the second magnetic field.
A system for acquiring polarization information of a subsurface medium, comprising: the device comprises a transmitting coil, a receiving coil and a processing module; wherein the content of the first and second substances,
the processing module is used for acquiring magnetic field parameters of a first magnetic field and magnetic field parameters of a second magnetic field in a preset space by using the transmitting coil and the receiving coil, wherein the frequencies of the first magnetic field and the second magnetic field are different, decomposing the magnetic field parameters of the first magnetic field to obtain secondary magnetic field parameters of the first magnetic field, decomposing the magnetic field parameters of the second magnetic field to obtain secondary magnetic field parameters of the second magnetic field, and calculating the induced polarization information of the underground medium according to the secondary magnetic field parameters of the first magnetic field and the secondary magnetic field parameters of the second magnetic field.
Optionally, the processing module is configured to obtain, by using the transmitting coil and the receiving coil, a magnetic field parameter of a first magnetic field and a magnetic field parameter of a second magnetic field in a preset space, and specifically, in the preset space, transmit a first magnetic line of force by using the transmitting coil, so that the first magnetic line of force reacts with the underground medium to generate a first magnetic field, and receive the magnetic field parameter of the first magnetic field by using the receiving coil;
and in the preset space, a second magnetic line is transmitted by using the transmitting coil so as to enable the second magnetic line to react with the underground medium to generate a second magnetic field, and the receiving coil is used for receiving the magnetic field parameters of the second magnetic field.
Optionally, the processing module calculates induced polarization information of the underground medium according to the secondary magnetic field parameter of the first magnetic field and the secondary magnetic field parameter of the second magnetic field, and specifically substitutes the secondary magnetic field parameter of the first magnetic field and the secondary magnetic field parameter of the second magnetic field into a first preset formula to calculate and obtain the induced polarization information of the underground medium;
the first preset formula includes:
wherein DIP represents induced polarization information of the subsurface medium, Bs(f1) Denotes the secondary magnetic field parameter of the first magnetic field, Imag [ B ]s(f1)]An imaginary part, B, of a secondary magnetic field parameter representing the first magnetic fields(f2) A secondary magnetic field parameter, Imag [ B ], representing the second magnetic fields(f2)]Represents the imaginary part of the secondary magnetic field parameter of the second magnetic field, f represents the frequency of the first magnetic field, f2Representing the frequency of the second magnetic field.
Optionally, the processing module decomposes the magnetic field parameter of the first magnetic field to obtain a secondary magnetic field parameter of the first magnetic field, and specifically, decomposes the magnetic field parameter of the first magnetic field into a primary magnetic field of the first magnetic field and a secondary magnetic field of the first magnetic field, so that a sum of the primary magnetic field of the first magnetic field and the secondary magnetic field of the first magnetic field is equal to the magnetic field parameter of the first magnetic field.
Optionally, the processing module is configured to respectively perform the magnetic field parameters of the second magnetic field to obtain secondary magnetic field parameters of the second magnetic field, and the secondary magnetic field parameters of the second magnetic field are specifically used to decompose the magnetic field parameters of the second magnetic field into a primary magnetic field of the second magnetic field and a secondary magnetic field of the second magnetic field, so that a sum of the primary magnetic field of the second magnetic field and the secondary magnetic field of the second magnetic field is equal to the magnetic field parameters of the second magnetic field.
It can be seen from the above technical solutions that the present application provides a method and a system for acquiring polarization information of an underground medium, wherein the method for acquiring polarization information of an underground medium acquires polarization information of an underground medium based on a frequency domain electromagnetic method, that is, first acquires a magnetic field parameter of a first magnetic field and a magnetic field parameter of a second magnetic field in a preset space, then decomposes the magnetic field parameters of the first magnetic field and the second magnetic field respectively to acquire a secondary magnetic field parameter of the first magnetic field and a secondary magnetic field parameter of the second magnetic field, and finally calculates induced polarization information of an underground medium according to the secondary magnetic field parameter of the first magnetic field and the secondary magnetic field parameter of the second magnetic field, the method does not need to contact with the ground, does not need to manually set a copper electrode inserted into the ground, forms a magnetic field only through a coil, and processes and calculates the magnetic field parameters to acquire the induced polarization information of the underground medium, the method is also applicable to areas with higher grounding resistance and poorer ground trafficability, and achieves the purposes of improving the acquisition efficiency of the polarization information of the underground medium, reducing the labor cost for acquiring the polarization information of the underground medium and improving the applicability of the method for acquiring the polarization information of the underground medium.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for acquiring polarization information of a subsurface medium according to an embodiment of the present application;
fig. 2 is a schematic flowchart of a method for acquiring polarization information of a subsurface medium according to another embodiment of the present application;
FIG. 3 is a schematic view of a subsurface media model provided by an embodiment of the present application;
FIG. 4 is a graphical representation of the results of a simulation of the subsurface medium model shown in FIG. 3 according to one embodiment of the present application;
fig. 5 is a schematic flowchart of a method for acquiring polarization information of a subsurface medium according to another embodiment of the present application;
fig. 6 is a schematic structural diagram of a system for acquiring polarization information of a subsurface medium according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a method for acquiring polarization information of an underground medium, as shown in fig. 1, the method includes:
s101: acquiring magnetic field parameters of a first magnetic field and magnetic field parameters of a second magnetic field in a preset space, wherein the frequencies of the first magnetic field and the second magnetic field are different;
s102: decomposing the magnetic field parameters of the first magnetic field to obtain secondary magnetic field parameters of the first magnetic field;
s103: decomposing the magnetic field parameters of the second magnetic field to obtain secondary magnetic field parameters of the second magnetic field;
s104: and calculating the induced polarization information of the underground medium according to the secondary magnetic field parameters of the first magnetic field and the secondary magnetic field parameters of the second magnetic field.
In this embodiment, the method for acquiring polarization information of an underground medium acquires polarization information of the underground medium based on a frequency domain electromagnetic method, that is, first acquiring magnetic field parameters of a first magnetic field and a second magnetic field in a preset space, then decomposing the magnetic field parameters of the first magnetic field and the second magnetic field respectively to acquire secondary magnetic field parameters of the first magnetic field and secondary magnetic field parameters of the second magnetic field, and finally calculating induced polarization information of the underground medium according to the secondary magnetic field parameters of the first magnetic field and the secondary magnetic field parameters of the second magnetic field, without contacting with the ground, without manually setting a copper electrode inserted into the ground, only forming a magnetic field by a coil, and processing and calculating the magnetic field parameters to acquire the induced polarization information of the underground medium, and is also applicable to some regions with higher ground resistance and poorer ground trafficability, the method and the device achieve the purposes of improving the efficiency of acquiring the polarization information of the underground medium, reducing the labor cost of acquiring the polarization information of the underground medium and improving the applicability of the method for acquiring the polarization information of the underground medium.
Optionally, with reference to fig. 2, the calculating induced polarization information of the subsurface medium according to the secondary magnetic field parameter of the first magnetic field and the secondary magnetic field parameter of the second magnetic field includes:
s1041: substituting the secondary magnetic field parameters of the first magnetic field and the secondary magnetic field parameters of the second magnetic field into a first preset formula to calculate and obtain induced polarization information of the underground medium;
the first preset formula includes:
wherein DIP represents induced polarization information of the subsurface medium, Bs(f1) Denotes the secondary magnetic field parameter of the first magnetic field, Imag [ B ]s(f1)]An imaginary part, B, of a secondary magnetic field parameter representing the first magnetic fields(f2) A secondary magnetic field parameter, Imag [ B ], representing the second magnetic fields(f2)]Represents the imaginary part of the secondary magnetic field parameter of the second magnetic field, f represents the frequency of the first magnetic field, f2Representing the frequency of the second magnetic field.
The derivation and acquisition process of the first preset formula is described as follows:
the control equation of the frequency domain controllable source electromagnetic field can be expressed by formula (1) and formula (2):
in the formulas (1) and (2), E represents an electric field, B represents a magnetic field, omega represents an angular frequency, and M and J represent a magnetic source and an electric source respectively. σ, μ are the electrical conductivity and magnetic permeability, respectively, of the earth's medium. Suppose the earth has no magnetism mu ═ mu0We decompose the magnetic field into a primary magnetic field BpAnd a secondary magnetic field BsThen, there are:
B＝Bp+Bs(3)；
we can deduce the secondary field control method of the magnetic field by decomposition:
if the electrical conductivity of the earth's medium is non-dispersive, equation (4) can be written as:
when angular frequency ω is 0, B by definition s0. We therefore assume that when the frequency is sufficiently low, the secondary magnetic field can be represented by a first order taylor expansion:
equation (5) can be written as:
analytical formulae (7), BpIs purely real, so the term on the right hand side of the equation is purely imaginary. Equation of
Is a purely real number, then:
equation (6) is thus a pure imaginary number. Real denotes the Real part of the complex number and Imag denotes the imaginary part of the complex number. Thus, in non-dispersive earth media, the imaginary part of the secondary magnetic field of the magnetic source frequency sounding is a physical quantity that varies linearly with frequency.
At this time, we can define a calculation expression of the physical quantity for obtaining the information about the induced polarization, i.e. the first preset formula:
as can be seen from the first preset formula, when the measurement frequency is low, the imaginary component of the secondary magnetic field is a physical quantity that varies linearly with the frequency. Therefore, in the case of non-dispersive conductivity of the local sphere medium, DIP is 0.
By using the first preset formula, the induced polarization characteristic of the underground medium can be judged by using the induced polarization information of the underground medium obtained by calculation, so that the judgment of the attribute of the underground medium is realized.
As mentioned above, a low frequency situation is assumed in the derivation process of the first preset formula, so in an embodiment of the present application, the frequency of the first magnetic field and the frequency of the second magnetic field are generally small, and may be, for example, 1Hz, 2Hz, 3Hz, and the like, that is, the frequency of the first magnetic field and the frequency of the second magnetic field do not exceed a preset threshold, and the value of the preset threshold may be 10Hz or 20Hz, and the present application does not limit this.
In order to verify the use effect of the induced polarization information of the subsurface medium, a model was designed as shown in fig. 3, in which a cubic anomaly Block (subsurface medium) was located in a uniform half space with a resistivity of 100 Ω · m. The depth of the anomaly is 100m, with a size of 100m by 100m in the x-, y-and z-directions, respectively. The resistivity of the anomaly Block is 5 Ω · m. The measurement range was from-150 m to 150m, with a spacing of 25 m. The calculated frequencies were 1Hz and 2 Hz. We have calculated two sets of data in total: individual conduction anomalies, coupling of conduction anomalies and excitatory effects. Induced polarization parameters: τ is 0.1s, η is 0.3, and c is 0.5. The specific result is shown in fig. 4, and it can be seen from fig. 4 that, after the abnormal body is added with the induced polarization information, the induced polarization information values of the three components of the secondary magnetic field can well reflect the induced polarization information. In fig. 4, X, Y denote horizontal distances in two vertical directions, Bx, By, and Bz denote three components of the magnetic field in the XYZ direction, respectively, and DIP denotes the induced polarization parameter.
Optionally, referring to fig. 5, the acquiring the magnetic field parameter of the first magnetic field and the magnetic field parameter of the second magnetic field in the preset space includes:
s1011: in the preset space, a transmitting coil is used for transmitting a first magnetic line of force so as to enable the first magnetic line of force to react with the underground medium to generate a first magnetic field, and a receiving coil is used for receiving magnetic field parameters of the first magnetic field;
s1012: and in the preset space, a second magnetic line is transmitted by using the transmitting coil so as to enable the second magnetic line to react with the underground medium to generate a second magnetic field, and the receiving coil is used for receiving the magnetic field parameters of the second magnetic field.
The decomposing the magnetic field parameters of the first magnetic field to obtain the secondary magnetic field parameters of the first magnetic field comprises:
s1021: decomposing the magnetic field parameters of the first magnetic field into a primary magnetic field of the first magnetic field and a secondary magnetic field of the first magnetic field such that the sum of the primary magnetic field of the first magnetic field and the secondary magnetic field of the first magnetic field is equal to the magnetic field parameters of the first magnetic field.
The step of respectively obtaining the magnetic field parameters of the second magnetic field to obtain the secondary magnetic field parameters of the second magnetic field comprises:
s1031: decomposing the magnetic field parameters of the second magnetic field into a primary magnetic field of the second magnetic field and a secondary magnetic field of the second magnetic field such that the sum of the primary magnetic field of the second magnetic field and the secondary magnetic field of the second magnetic field is equal to the magnetic field parameters of the second magnetic field.
The system for acquiring polarization information of a subsurface medium provided by the embodiments of the present application is described below, and the system for acquiring polarization information of a subsurface medium described below may be referred to in correspondence with the method for acquiring polarization information of a subsurface medium described above.
Accordingly, an embodiment of the present application provides a system for acquiring polarization information of a subsurface medium, as shown in fig. 6, including: a transmitting coil TX, a receiving coil RX and a processing module; wherein the content of the first and second substances,
the processing module is configured to acquire a magnetic field parameter of a first magnetic field and a magnetic field parameter of a second magnetic field in a preset space by using the transmitting coil TX and the receiving coil RX, where the frequencies of the first magnetic field and the second magnetic field are different, decompose the magnetic field parameter of the first magnetic field to obtain a secondary magnetic field parameter of the first magnetic field, decompose the magnetic field parameter of the second magnetic field to obtain a secondary magnetic field parameter of the second magnetic field, and calculate induced polarization information of an underground medium according to the secondary magnetic field parameter of the first magnetic field and the secondary magnetic field parameter of the second magnetic field.
As shown in fig. 6, the transmitting coil TX and the receiving coil RX may be disposed on an aircraft (e.g., a helicopter, an unmanned aerial vehicle, etc.) to establish a magnetic field and obtain magnetic field parameters, so as to achieve the purpose of obtaining polarization information of an underground medium without contacting the ground, and greatly improve the applicability of the method and the system for obtaining polarization information of an underground medium.
In fig. 6, the distance between the transmitting coil TX and the receiving coil RX is about 8m, and generally, the distance between the transmitting coil TX and the receiving coil RX needs to be greater than or equal to a certain value to avoid interference between the two coils.
Optionally, the processing module is configured to obtain a magnetic field parameter of a first magnetic field and a magnetic field parameter of a second magnetic field in a preset space by using the transmitting coil TX and the receiving coil RX, and specifically, in the preset space, transmit a first magnetic line by using the transmitting coil TX so that the first magnetic line and the underground medium act to generate a first magnetic field, and receive the magnetic field parameter of the first magnetic field by using the receiving coil RX;
and in the preset space, a second magnetic line is transmitted by using the transmitting coil TX so that the second magnetic line and the underground medium act to generate a second magnetic field, and the magnetic field parameters of the second magnetic field are received by using the receiving coil RX.
Optionally, the processing module calculates induced polarization information of the underground medium according to the secondary magnetic field parameter of the first magnetic field and the secondary magnetic field parameter of the second magnetic field, and specifically substitutes the secondary magnetic field parameter of the first magnetic field and the secondary magnetic field parameter of the second magnetic field into a first preset formula to calculate and obtain the induced polarization information of the underground medium;
the first preset formula includes:
wherein DIP represents induced polarization information of the subsurface medium, Bs(f1) Denotes the secondary magnetic field parameter of the first magnetic field, Imag [ B ]s(f1)]An imaginary part, B, of a secondary magnetic field parameter representing the first magnetic fields(f2) A secondary magnetic field parameter, Imag [ B ], representing the second magnetic fields(f2)]Represents the imaginary part of the secondary magnetic field parameter of the second magnetic field, f represents the frequency of the first magnetic field, f2Representing the frequency of the second magnetic field.
Optionally, the processing module decomposes the magnetic field parameter of the first magnetic field to obtain a secondary magnetic field parameter of the first magnetic field, and specifically, decomposes the magnetic field parameter of the first magnetic field into a primary magnetic field of the first magnetic field and a secondary magnetic field of the first magnetic field, so that a sum of the primary magnetic field of the first magnetic field and the secondary magnetic field of the first magnetic field is equal to the magnetic field parameter of the first magnetic field.
Optionally, the processing module is configured to respectively perform the magnetic field parameters of the second magnetic field to obtain secondary magnetic field parameters of the second magnetic field, and the secondary magnetic field parameters of the second magnetic field are specifically used to decompose the magnetic field parameters of the second magnetic field into a primary magnetic field of the second magnetic field and a secondary magnetic field of the second magnetic field, so that a sum of the primary magnetic field of the second magnetic field and the secondary magnetic field of the second magnetic field is equal to the magnetic field parameters of the second magnetic field.
In summary, the embodiment of the present application provides a method and a system for acquiring polarization information of an underground medium, wherein the method for acquiring polarization information of an underground medium acquires polarization information of an underground medium based on a frequency domain electromagnetic method, that is, first acquires a magnetic field parameter of a first magnetic field and a magnetic field parameter of a second magnetic field in a preset space, then decomposes the magnetic field parameters of the first magnetic field and the second magnetic field respectively to acquire a secondary magnetic field parameter of the first magnetic field and a secondary magnetic field parameter of the second magnetic field, and finally calculates induced polarization information of the underground medium according to the secondary magnetic field parameter of the first magnetic field and the secondary magnetic field parameter of the second magnetic field, the method does not need to contact with the ground, does not need to manually set a copper electrode inserted into the ground, forms a magnetic field only through a coil, and processes and calculates the magnetic field parameters to acquire the induced polarization information of the underground medium, the method is also applicable to areas with higher grounding resistance and poorer ground trafficability, and achieves the purposes of improving the acquisition efficiency of the polarization information of the underground medium, reducing the labor cost for acquiring the polarization information of the underground medium and improving the applicability of the method for acquiring the polarization information of the underground medium.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for acquiring polarization information of underground media is characterized by comprising the following steps:
acquiring magnetic field parameters of a first magnetic field and magnetic field parameters of a second magnetic field in a preset space, wherein the frequencies of the first magnetic field and the second magnetic field are different;
decomposing the magnetic field parameters of the first magnetic field to obtain secondary magnetic field parameters of the first magnetic field;
decomposing the magnetic field parameters of the second magnetic field to obtain secondary magnetic field parameters of the second magnetic field;
and calculating the induced polarization information of the underground medium according to the secondary magnetic field parameters of the first magnetic field and the secondary magnetic field parameters of the second magnetic field.
2. The method for acquiring polarization information of a subsurface medium according to claim 1, wherein the calculating induced polarization information of a subsurface medium according to the secondary magnetic field parameters of the first magnetic field and the secondary magnetic field parameters of the second magnetic field comprises:
substituting the secondary magnetic field parameters of the first magnetic field and the secondary magnetic field parameters of the second magnetic field into a first preset formula to calculate and obtain induced polarization information of the underground medium;
the first preset formula includes:
wherein DIP represents induced polarization information of the subsurface medium, Bs(f1) Denotes the secondary magnetic field parameter of the first magnetic field, Imag [ B ]s(f1)]An imaginary part, B, of a secondary magnetic field parameter representing the first magnetic fields(f2) A secondary magnetic field parameter, Imag [ B ], representing the second magnetic fields(f2)]Represents the imaginary part of the secondary magnetic field parameter of the second magnetic field, f represents the frequency of the first magnetic field, f2Representing the frequency of the second magnetic field.
3. The method for acquiring polarization information of a subsurface medium as claimed in claim 1, wherein acquiring the magnetic field parameters of the first magnetic field and the magnetic field parameters of the second magnetic field in the predetermined space comprises:
in the preset space, a transmitting coil is used for transmitting a first magnetic line of force so as to enable the first magnetic line of force to react with the underground medium to generate a first magnetic field, and a receiving coil is used for receiving magnetic field parameters of the first magnetic field;
and in the preset space, a second magnetic line is transmitted by using the transmitting coil so as to enable the second magnetic line to react with the underground medium to generate a second magnetic field, and the receiving coil is used for receiving the magnetic field parameters of the second magnetic field.
4. The method of claim 1, wherein decomposing the magnetic field parameters of the first magnetic field to obtain the secondary magnetic field parameters of the first magnetic field comprises:
decomposing the magnetic field parameters of the first magnetic field into a primary magnetic field of the first magnetic field and a secondary magnetic field of the first magnetic field such that the sum of the primary magnetic field of the first magnetic field and the secondary magnetic field of the first magnetic field is equal to the magnetic field parameters of the first magnetic field.
5. The method for acquiring polarization information of a subsurface medium according to claim 1, wherein the step of obtaining the magnetic field parameters of the second magnetic field separately comprises:
decomposing the magnetic field parameters of the second magnetic field into a primary magnetic field of the second magnetic field and a secondary magnetic field of the second magnetic field such that the sum of the primary magnetic field of the second magnetic field and the secondary magnetic field of the second magnetic field is equal to the magnetic field parameters of the second magnetic field.
6. A system for acquiring polarization information of a subsurface medium, comprising: the device comprises a transmitting coil, a receiving coil and a processing module; wherein the content of the first and second substances,
the processing module is used for acquiring magnetic field parameters of a first magnetic field and magnetic field parameters of a second magnetic field in a preset space by using the transmitting coil and the receiving coil, wherein the frequencies of the first magnetic field and the second magnetic field are different, decomposing the magnetic field parameters of the first magnetic field to obtain secondary magnetic field parameters of the first magnetic field, decomposing the magnetic field parameters of the second magnetic field to obtain secondary magnetic field parameters of the second magnetic field, and calculating the induced polarization information of the underground medium according to the secondary magnetic field parameters of the first magnetic field and the secondary magnetic field parameters of the second magnetic field.
7. The system for acquiring polarization information of an underground medium according to claim 6, wherein the processing module is configured to acquire the magnetic field parameters of the first magnetic field and the magnetic field parameters of the second magnetic field in a preset space by using the transmitting coil and the receiving coil, and in particular, to transmit the first magnetic force lines by using the transmitting coil in the preset space so that the first magnetic force lines interact with the underground medium to generate a first magnetic field, and receive the magnetic field parameters of the first magnetic field by using the receiving coil;
and in the preset space, a second magnetic line is transmitted by using the transmitting coil so as to enable the second magnetic line to react with the underground medium to generate a second magnetic field, and the receiving coil is used for receiving the magnetic field parameters of the second magnetic field.
8. The system for acquiring polarization information of a subsurface polarized medium according to claim 6, wherein the processing module calculates the induced polarization information of the subsurface medium according to the secondary magnetic field parameter of the first magnetic field and the secondary magnetic field parameter of the second magnetic field, and is specifically configured to substitute the secondary magnetic field parameter of the first magnetic field and the secondary magnetic field parameter of the second magnetic field into a first preset formula to calculate the induced polarization information of the subsurface medium;
the first preset formula includes:
wherein DIP represents induced polarization information of the subsurface medium, Bs(f1) Denotes the secondary magnetic field parameter of the first magnetic field, Imag [ B ]s(f1)]An imaginary part, B, of a secondary magnetic field parameter representing the first magnetic fields(f2) A secondary magnetic field parameter, Imag [ B ], representing the second magnetic fields(f2)]Represents the imaginary part of the secondary magnetic field parameter of the second magnetic field, f represents the frequency of the first magnetic field, f2Representing the frequency of the second magnetic field.
9. The system of claim 6, wherein the processing module decomposes the magnetic field parameters of the first magnetic field to obtain the secondary magnetic field parameters of the first magnetic field is configured to decompose the magnetic field parameters of the first magnetic field into a primary magnetic field of the first magnetic field and a secondary magnetic field of the first magnetic field, such that a sum of the primary magnetic field of the first magnetic field and the secondary magnetic field of the first magnetic field is equal to the magnetic field parameters of the first magnetic field.
10. The system of claim 6, wherein the processing module is configured to separate the magnetic field parameters of the second magnetic field to obtain the secondary magnetic field parameters of the second magnetic field, and is specifically configured to decompose the magnetic field parameters of the second magnetic field into a primary magnetic field of the second magnetic field and a secondary magnetic field of the second magnetic field, so that a sum of the primary magnetic field of the second magnetic field and the secondary magnetic field of the second magnetic field is equal to the magnetic field parameters of the second magnetic field.
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