AU2021100491A4 - A method for analyzing equivalence phenomenon of electrical source transient electromagnetic method - Google Patents
A method for analyzing equivalence phenomenon of electrical source transient electromagnetic method Download PDFInfo
- Publication number
- AU2021100491A4 AU2021100491A4 AU2021100491A AU2021100491A AU2021100491A4 AU 2021100491 A4 AU2021100491 A4 AU 2021100491A4 AU 2021100491 A AU2021100491 A AU 2021100491A AU 2021100491 A AU2021100491 A AU 2021100491A AU 2021100491 A4 AU2021100491 A4 AU 2021100491A4
- Authority
- AU
- Australia
- Prior art keywords
- equivalence
- phenomenon
- electrical source
- transient electromagnetic
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- General Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Electromagnetism (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention discloses a method for analyzing equivalence phenomenon of electrical source
transient electromagnetic method, which comprises the following steps:
Si, based on the forward modeling theory of electrical source, verify whether the equivalence
phenomenon of electrical source transient electromagnetic method exists in the area to be
measured, and obtain the existence conditions of the equivalence phenomenon.
S2, respectively calculating horizontal electric field components and vertical magnetic field
components based on a three-layer geoelectric model under the influence of transient
electromagnetic of an electrical source, and obtaining the influence degree of the horizontal
electric field components and the vertical magnetic field components on equivalence
phenomenon.
S3, based on the component with low influence degree on the equivalence phenomenon in step
S2, obtaining the influence degree of different offset distances on the equivalence phenomenon
of electrical source transient electromagnetic, and obtaining the influence curve of offset
distances on the equivalence phenomenon of electrical source transient electromagnetic based
on the influence degree. The method can quickly and accurately acquire the influencing factors
and influencing rules of the equivalence phenomenon of the electrical source transient
electromagnetic method.
1/4
Si, based on the forward modeling theory of electrical source, veify whether the equivalence
phenomenon of electrical source tranent electromagnetic method exists in the area to be meured,
and obtain theexistence conditions of the equivalence phenomenon.
S2, respectively calculating horizontal electne field components and vertical magnetic
field corponentbased on a three-layer geoelectric odel under the influence of transient
electromagnetic of an electrical source, and obtammg the influence degree of the
horizontal electric field conporients and the vertical magnetic field components on
equivalence phenrnenor
S3, based on the component with low influence degree on the equivalence
phenomenon in step S2, obtaining the influence degree of different offset distances on
the equivalence phenomenon of electrical source transient electromagnetic, and
obtaining the influence curve of offset distances on the equivalence phenomenon of
electrical source transient electromagnetic based on the influence degree.
Fig. 1 A flow chart of the method for analyzing equivalence phenomenon of
electrical source transient electromagnetic method according to the invention.
Description
1/4
Si, based on the forward modeling theory of electrical source, veify whether the equivalence phenomenon of electrical source tranent electromagnetic method exists in the area to be meured, and obtain theexistence conditions of the equivalence phenomenon.
S2, respectively calculating horizontal electne field components and vertical magnetic field corponentbased on a three-layer geoelectric odel under the influence of transient electromagnetic of an electrical source, and obtammg the influence degree of the horizontal electric field conporients and the vertical magnetic field components on equivalence phenrnenor
S3, based on the component with low influence degree on the equivalence phenomenon in step S2, obtaining the influence degree of different offset distances on the equivalence phenomenon of electrical source transient electromagnetic, and obtaining the influence curve of offset distances on the equivalence phenomenon of electrical source transient electromagnetic based on the influence degree.
Fig. 1 A flow chart of the method for analyzing equivalence phenomenon of
electrical source transient electromagnetic method according to the invention.
A method for analyzing equivalence phenomenon of electrical source transient
electromagnetic method
[01] The invention belongs to the technical field of electrical source transient electromagnetic method equivalence phenomenon analysis, in particular refers to a method for analyzing equivalence phenomenon of electrical source transient electromagnetic method.
[02] Equivalence phenomenon is an inevitable problem encountered in electro magnetic exploration. Equivalence phenomenon refers to the phenomenon that the difference between apparent resistivity curves or response curves of two geoelectric sections with different formation parameters is within the relevant error range, so that they are regarded as the same curve, which is a common problem encountered in electro-magnetic exploration and electro-magnetic exploration. The existence of equivalence phenomenon can easily lead to multiple solutions of data interpretation, which has a great impact on the exploration effect of electromagnetic method.
[03] People have realized the existence of equivalence phenomenon for a long time, and studied its principle and basic characteristics. Luo Yanzhong (1979) studied the S-type equivalence phenomenon of G-type curves in direct current method, and thought that if the product of resistivity and thickness of two G-type two-layer sections is the same, regardless of the same value of the thickness and resistivity of the first layer, the tail sections of their sounding curves will coincide with each other within a sufficient precision range. Nie Shunfu (1986) studied the equivalent range of H-shaped sounding curve, and thought that the size of H-shaped equivalent range was closely related to the thickness parameter of intermediate layer. Li Jinming (2005) theoretically deduced the equivalence phenomenon of S and H in frequency domain electrical sounding, and made a physical explanation.
[04] According to the nature of emission source, transient electromagnetic method can be divided into magnetic source transient electromagnetic and electrical source transient electromagnetic. Misac N. Nabighian(1991) expounded the TEM equivalence phenomenon of magnetic source, and thought that the existence of equivalence phenomenon seriously affected TEM data processing and inversion. Li Xiu (2002) systematically summarized the equivalence principle of apparent resistivity curve of TEM magnetic source, and proved that the resolution of transient electromagnetic sounding method is better than that of direct current sounding and frequency domain sounding through the equivalence phenomenon range.
[05] Electrical source transient electromagnetic method can be divided into electrical source long offset transient electromagnetic method LOTEM and electrical source short offset transient electromagnetic method SOTEM. LOTEM originated in 1930s. Misac N. Nabighian (1988) introduced in detail the electromagnetic propagation, response calculation and characteristics, apparent resistivity calculation, etc. Strack K M. (1992) studied LOTEM and provided a large number of field examples. SOTEM has been developing since it was put forward. However, no matter LOTEM or SOTEM, the phenomenon of transient electromagnetic equivalence of electrical source is rarely involved at home and abroad.
[06] Therefore, it is particularly necessary to provide a method for analyzing equivalence phenomenon of electrical source transient electromagnetic method.
[07] The purpose of the present invention is to provide a method for analyzing equivalence phenomenon of electrical source transient electromagnetic method, so as to solve the technical problems existing in the existing technologies, and to quickly and accurately obtain the influencing factors and influencing rules of the equivalence phenomenon of electrical source transient electromagnetic method.
[08] In order to achieve the above purpose, the present invention provides the following scheme: the present invention provides a method for analyzing equivalence phenomenon of electrical source transient electromagnetic method, which comprises the following steps:
[09] Si, based on the forward modeling theory of electrical source, verify whether the equivalence phenomenon of electrical source transient electromagnetic method exists in the area to be measured, and obtain the existence conditions of the equivalence phenomenon.
[010] S2, respectively calculating horizontal electric field components and vertical magnetic field components based on a three-layer geoelectric model under the influence of transient electromagnetic of an electrical source, and obtaining the influence degree of the horizontal electric field components and the vertical magnetic field components on equivalence phenomenon.
[011] S3, based on the component with low influence degree on the equivalence phenomenon in step S2, obtaining the influence degree of different offset distances on the equivalence phenomenon of electrical source transient electromagnetic, and obtaining the influence curve of offset distances on the equivalence phenomenon of electrical source transient electromagnetic based on the influence degree.
[012] Preferably, in Sl, verifying whether the equivalence phenomenon exists in the area to be measured is based on the forward modeling theory of electrical source, which specifically includes: under the influence of electrical source transient electromagnetic, calculating the apparent resistivity at the geoelectric section based on the three-layer geoelectric model, obtaining the expression of each layer parameter based on the apparent resistivity, and comparing the expression of each layer parameter with the expression of each layer parameter obtained by magnetic source transient electromagnetic, if they are the same, the equivalence phenomenon exists, otherwise, the equivalence phenomenon does not exist.
P2 -- P
[013] Preferably, the expressions of formation parameters include: 1
-P3 - h2 P h2 2, where , P2 and A respectively represent the resistivity of the
first, second and third layers in the three-layer geoelectric model, and hi and h2 respectively represent the thickness of the first and second layers in the three-layer geoelectric model.
[014] Preferably, the equivalence phenomenon includes T equivalence phenomenon, H equivalence phenomenon and S equivalence phenomenon.
[015] Preferably, in S1, the method for obtaining the existence conditions of T equivalence phenomenon comprises: keeping the parameters of the first layer and the third layer of the three-layer geoelectric model unchanged, setting several three-layer
geoelectric models with different intermediate layer thickness h2 and resistivity P2
and equal 2 h, the apparent resistivity response of transient electromagnetic of electrical source in the whole region is calculated, and the existence condition of T equivalence phenomenon is obtained based on the resolution of response curve.
[016] Preferably, in Sl, the method for verifying the existence condition of H equivalence includes: keeping the parameters of the first layer and the third layer of the three-layer geoelectric model unchanged, setting several three-layer geoelectric models
with constant middle layer thickness h2 and different middle layer resistivity P2
, calculating the apparent resistivity response of the transient electromagnetic of the electrical source in the whole region, and verifying whether there is H equivalence phenomenon based on the resolution of the response curve.
[017] Preferably, in Si, the method for obtaining the existence conditions of S equivalence phenomenon comprises: keeping the parameters of the first layer and the third layer of the three-layer geoelectric model unchanged, setting several three-layer
geoelectric models with intermediate layer thickness h2 and resistivity P2 smaller
than those of the first layer and/or the third layer, and keeping the ratio S2 of
intermediate layer thickness h2 and resistivity P2 unchanged.
[018] Preferably, S2 comprises: respectively calculating horizontal electric field components and vertical magnetic field components based on a three-layer geoelectric model under the influence of electrical source transient electromagnetic, and obtaining the influence degree of horizontal electric field components and vertical magnetic field components on equivalence phenomenon based on the resolution of horizontal electric field components and vertical magnetic field components.
[019] Preferably, S3 includes: respectively calculating the response of horizontal electric field components at different offset distances under the condition of satisfying
T equivalence phenomenon, H equivalence phenomenon and S equivalence phenomenon, and obtaining the influence degree of different offset distances on electrical source transient electromagnetic equivalence phenomenon based on the resolution of horizontal electric field components.
[020] The invention discloses the following technical effects:
[021] According to the method, the influence factors and the influence rules of the equivalence phenomenon of the electrical source transient electromagnetic method can be quickly and accurately obtained through the horizontal electric field component and the vertical magnetic field component, and the influence of the equivalence phenomenon on exploration can be pertinently weakened in practical application through the influence rules of different factors.
[022] In order to explain the embodiments of the present invention or the technical scheme in the existing technologies more clearly, the figures required in the embodiments will be briefly introduced below. Obviously, the figures in the following description are only some embodiments of the present invention, and for ordinary technicians in the field, other figures can be obtained according to these figures without paying creative labor.
[023] Fig. 1 is a flow chart of the method for analyzing equivalence phenomenon of electrical source transient electromagnetic method according to the invention.
[024] Fig. 2 is an apparent resistivity curve obtained in the process of obtaining the existence condition of the T equivalence phenomenon in the embodiment of the present invention.
[025] Fig. 3 is an apparent resistivity curve obtained in the process of obtaining the existence condition of the H equivalence phenomenon in an embodiment of the present invention.
[026] Fig. 4 is an apparent resistivity curve obtained in the process of obtaining the existence condition of the S equivalence phenomenon in an embodiment of the present invention.
[027] The technical scheme in the embodiments of the present invention will be described clearly and completely with reference to the figures in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative labor belong to the scope of protection of the present invention.
[028] In order to make the above objects, features and advantages of the present invention more obvious and easy to understand, the present invention will be further explained in detail with reference to the figures and specific embodiments.
[029] Referring to Fig. 1, this embodiment provides a method for analyzing equivalence phenomenon of electrical source transient electromagnetic method, which includes the following steps:
[030] Si, based on the forward modeling theory of electrical source, verify whether the equivalence phenomenon of electrical source transient electromagnetic method exists in the area to be measured, and obtain the existence conditions of the equivalence phenomenon.
[031] The electrical source forward modeling theory is used to verify whether the equivalence phenomenon exists in the area to be measured, which specifically includes: under the influence of electrical source transient electromagnetic, calculating the apparent resistivity at the geoelectric section based on the three-layer geoelectric model, obtaining the expression of each layer parameter based on the apparent resistivity, and comparing the expression of each layer parameter with that obtained by magnetic source transient electromagnetic. The expressions of the parameters of each layer
P3 = v2 = h p2 = include: 1 , where , P2 and respectively represent the resistivity of the first, second and third layers in the three-layer geoelectric model,
and hi and h2 respectively represent the thickness of the first and second layers in the three-layer geoelectric model.
[032] In this embodiment, the expressions of the calculated parameters of each layer are the same as those obtained by the magnetic source transient electromagnetic, which proves that there is equivalence phenomenon in the electrical source transient electromagnetic in the area to be measured.
[033] The equivalence phenomena include T equivalence and H equivalence when the middle layer of the three-layer geoelectric model is thin layer with high resistance, and S equivalence phenomenon when the middle layer of the three-layer geoelectric model is thin layer with low resistance.
[034] The method for obtaining the existence condition of the T equivalence phenomenon comprises the following steps:
[035] Under the condition of high resistance of thin layer, the parameters of the first layer and the third layer are kept unchanged, and several three-layer geoelectric
models with different thickness h2 and resistivity P2 of middle layer and equal
2 - 22 are set up, and the apparent resistivity response of transient electromagnetic
of electrical source in the whole region is calculated, and the existence conditions of T equivalence phenomenon are obtained based on the resolution of response curve. In this embodiment, three three-layer geoelectric models are set, and the model parameters are shown in Table 1:
[036] Table 1
Model 1 Model 2 Model 3
Lay Thickne Resistivity La Thickn Resistivit Lay Thickne Resistivit er ss (m) (Q-m) yer ess (m) y (Q-m) er ss (m) y (-m)
1 500 20 1 500 20 1 500 20 2 30 200 2 40 150 2 50 120
3 50 3 50 3 50
[037] The apparent resistivity curves obtained are shown in Fig. 2. It can be seen from Fig. 2 that the apparent resistivity curves of the three models basically coincide, and the apparent resistivity basically does not change under the same time channel. T therefore, as long as the product 2 of resistivity and thickness of the middle layer is unchanged, the change of thickness h2 and resistivity P2 cannot affect the apparent resistivity, which satisfies the T equivalence phenomenon.
[038] The method for obtaining the existence condition of H equivalent comprises the following steps:
[039] When the thin layer has high resistance, the parameters of the first layer and the third layer are kept unchanged, and several three-layer geoelectric models with
constant thickness h2 and different resistivity P2 of the middle layer are set up to calculate the apparent resistivity response of the transient electromagnetic of the electrical source in the whole region, and obtain the existence conditions of H equivalence phenomenon based on the resolution of the response curve. In this embodiment, three three-layer geoelectric models are set, and the model parameters are shown in Table 2:
[040] Table 2
Model 1 Model 2 Model 3
Laye Thickne Resistivit Lay Thickn Resistivit La Thickn Resistivit r ss (m) y (Q-m) er ess y (4-m) ye ess y (4-m) (m) r (m)
1 500 20 1 500 20 1 500 20 2 50 200 2 50 150 2 50 120 3 50 3 50 3 50
[041] Under the three-layer geoelectric models with three different intermediate layers, the apparent resistivity curves are shown in Fig. 3. It can be seen from Fig. 3 that the apparent resistivity curves of the three models basically coincide, and the apparent resistivity basically does not change under the same time channel. Therefore,
hi as long as the intermediate layer thickness is constant, that is, 2 is constant, the change of resistivity can not affect the apparent resistivity and satisfy the H equivalence phenomenon.
[042] The method for obtaining the existence condition of the S equivalence phenomenon comprises the following steps:
[043] In the low-resistivity thin layer, the parameters of the first layer and the third layer are kept unchanged, and several three-layer geoelectric models are set, in
which the thickness h2 and resistivity P2 of the middle layer are smaller than those of
the first layer and/or the third layer, and the ratio S2 of the thickness h2 and resistivity
P2 of the middle layer is unchanged. The apparent resistivity response of the transient electromagnetic of the electrical source in the whole region is calculated, and the existence conditions of the S equivalence phenomenon are obtained based on the resolution of the response curve. In this embodiment, three three-layer geoelectric models are set, and the model parameters are shown in Table 3:
[044] Table 3
Model 1 Model 2 Model 3
Laye Thickne Resistivit Lay Thickn Resistivit La Thickn Resistivit r ss (m) y (Q-m) er ess y (4-m) ye ess y (4-m) (m) r (m)
1 500 10 1 500 10 1 500 10 2 25 5 2 50 10 2 100 20 3 50 3 50 3 50
[045] Under the three-layer geoelectric models with three different intermediate layers, the apparent resistivity curves are shown in Fig. 4. It can be seen from Fig. 4 that the apparent resistivity curves of the three models basically coincide, and there is basically no change in apparent resistivity under the same time channel. Therefore, as
long as the thickness h2 and resistivity P2 of the intermediate layer are smaller than those of the first and/or third layer, and the ratio S2 of the thickness h2 and resistivity
P2 of the intermediate layer is unchanged, the S equivalence phenomenon is satisfied.
[046] S2, respectively calculating horizontal electric field component Ex and vertical magnetic field component Hz based on a three-layer geoelectric model under the influence of electrical source transient electromagnetic, and obtaining the influence degree of horizontal electric field component Ex and vertical magnetic field component Hz on equivalence phenomenon.
[047] Under the condition of satisfying T equivalence phenomenon, H equivalence phenomenon and S equivalence phenomenon, horizontal electric field component Ex and vertical magnetic field component Hz are calculated respectively based on three-layer geoelectric model, and the influence degree of horizontal electric field component Ex and vertical magnetic field component Hz on equivalence phenomenon is obtained based on the resolution of horizontal electric field component Ex and vertical magnetic field component Hz. The higher the resolution, the smaller the influence on equivalence phenomenon.
[048] In this embodiment, it is verified that the equivalence effect of Ex component is obviously weaker than that of Hz under the conditions of satisfying T equivalence phenomenon, H equivalence phenomenon and S equivalence phenomenon, especially in the data before 1Oms, the resolution ability of Ex is stronger than that of Hz.
[049] S3, based on the component with low influence degree on the equivalence phenomenon in step S2, obtaining the influence degree of different offset distances on the equivalence phenomenon of electrical source transient electromagnetic, and obtaining the influence curve of offset distances on the equivalence phenomenon of electrical source transient electromagnetic based on the influence degree.
[050] Under the condition of satisfying T equivalence phenomenon, H equivalence phenomenon and S equivalence phenomenon, the responses of Ex components at different offset distances are calculated respectively. Based on the resolution of horizontal electric field component Ex, the influence degree of different offset distances on transient electromagnetic equivalence of electrical source is obtained.
[051] In this embodiment, it is verified that under the conditions of satisfying the T equivalence phenomenon, H equivalence phenomenon and S equivalence phenomenon, the difference of Ex response decreases gradually with the increase of offset distance, that is, the smaller the offset distance, the weaker the equivalence effect.
[052] Through the influence curve of offset distance on transient electromagnetic equivalence phenomenon of electrical source, the influence of equivalence phenomenon on exploration can be reduced in practical application.
[053] Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms, in keeping with the broad principles and the spirit of the invention described herein.
[054] The present invention and the described embodiments specifically include the best method known to the applicant of performing the invention. The present invention and the described preferred embodiments specifically include at least one feature that is industrially applicable
Claims (9)
1. A method for analyzing equivalence phenomenon of electrical source transient
electromagnetic method, comprising:
Si, based on the forward modeling theory of electrical source, verify whether the
equivalence phenomenon of electrical source transient electromagnetic method exists
in the area to be measured, and obtain the existence conditions of the equivalence
phenomenon.
S2, respectively calculating horizontal electric field components and vertical magnetic
field components based on a three-layer geoelectric model under the influence of
transient electromagnetic of an electrical source, and obtaining the influence degree of
the horizontal electric field components and the vertical magnetic field components on
equivalence phenomenon.
S3, based on the component with low influence degree on the equivalence phenomenon
in step S2, obtaining the influence degree of different offset distances on the
equivalence phenomenon of electrical source transient electromagnetic, and obtaining
the influence curve of offset distances on the equivalence phenomenon of electrical
source transient electromagnetic based on the influence degree.
2. The method for analyzing equivalence phenomenon of electrical source transient
electromagnetic method according to claim 1, characterized in that in S1, verifying
whether the equivalence phenomenon exists in the area to be measured based on
electrical source forward modeling theory specifically comprises: under the influence
of electrical source transient electromagnetic, calculating the apparent resistivity at the geoelectric section based on the three-layer geoelectric model, obtaining the expression of each layer parameter based on the apparent resistivity, and comparing the expression of each layer parameter with the expression of each layer parameter obtained by magnetic source transient electromagnetic, if they are the same, the equivalence phenomenon exists, otherwise, the equivalence phenomenon does not exist.
3. The method for analyzing equivalence phenomenon of electrical source transient
electromagnetic method according to claim 2, characterized in that the expressions of
2p- p3 - v2 formation parameters include: p2 where , P2 and A
respectively represent the resistivity of the first, second and third layers in the three
layer geoelectric model, and hi and h2 respectively represent the thickness of the first
and second layers in the three-layer geoelectric model.
4. The method for analyzing equivalence phenomenon of electrical source transient
electromagnetic method according to claim 3, characterized in that the equivalence
phenomenon include T equivalence phenomenon, H equivalence phenomenon and S
equivalence phenomenon.
5. The method for analyzing equivalence phenomenon of electrical source transient
electromagnetic method according to claim 4, characterized in that in Sl, the method
for obtaining the existence conditions of T equivalence phenomenon comprises:
keeping the parameters of the first layer and the third layer of the three-layer geoelectric
model unchanged, setting several three-layer geoelectric models with different
h2 ~ ~ P2T ph intermediate layer thickness and resistivity P2 2and equal 2 , the apparent
resistivity response of transient electromagnetic of electrical source in the whole region is calculated, and the existence condition of T equivalence phenomenon is obtained based on the resolution of response curve.
6. The method for analyzing equivalence phenomenon of electrical source transient
electromagnetic method according to claim 4, characterized in that in SI, the method
for verifying the existence condition of H equivalence includes: keeping the parameters
of the first layer and the third layer of the three-layer geoelectric model unchanged,
setting several three-layer geoelectric models with constant middle layer thickness h2
and different middle layer resistivity P2 , calculating the apparent resistivity response
of the transient electromagnetic of the electrical source in the whole region, and
verifying whether there is H equivalence phenomenon based on the resolution of the
response curve.
7. The method for analyzing equivalence phenomenon of electrical source transient
electromagnetic method according to claim 4, characterized in that in SI, the method
for obtaining the existence conditions of S equivalence phenomenon comprises:
keeping the parameters of the first layer and the third layer of the three-layer geoelectric
model unchanged, setting several three-layer geoelectric models with intermediate
layer thickness h2 and resistivity P2 smaller than those of the first layer and/or the
third layer, and keeping the ratio S2 of intermediate layer thickness h2 and resistivity
P2 unchanged.
8. The method for analyzing equivalence phenomenon of electrical source transient
electromagnetic method according to claim 4, characterized in that the S2 comprises:
respectively calculating horizontal electric field components and vertical magnetic field components based on a three-layer geoelectric model under the influence of electrical source transient electromagnetic, and obtaining the influence degree of horizontal electric field components and vertical magnetic field components on equivalence phenomenon based on the resolution of horizontal electric field components and vertical magnetic field components.
9. The method for analyzing equivalence phenomenon of electrical source transient
electromagnetic method according to claim 4, characterized in that the S3 comprises:
respectively calculating the response of horizontal electric field components at different
offset distances under the condition of satisfying T equivalence phenomenon, H
equivalence phenomenon and S equivalence phenomenon, and obtaining the influence
degree of different offset distances on electrical source transient electromagnetic
equivalence phenomenon based on the resolution of horizontal electric field
components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021100491A AU2021100491A4 (en) | 2021-01-26 | 2021-01-26 | A method for analyzing equivalence phenomenon of electrical source transient electromagnetic method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021100491A AU2021100491A4 (en) | 2021-01-26 | 2021-01-26 | A method for analyzing equivalence phenomenon of electrical source transient electromagnetic method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021100491A4 true AU2021100491A4 (en) | 2021-04-15 |
Family
ID=75397059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021100491A Ceased AU2021100491A4 (en) | 2021-01-26 | 2021-01-26 | A method for analyzing equivalence phenomenon of electrical source transient electromagnetic method |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2021100491A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114265124A (en) * | 2021-12-30 | 2022-04-01 | 成都理工大学 | Unfavorable geologic body positioning method based on time domain transient electromagnetic probability inversion |
-
2021
- 2021-01-26 AU AU2021100491A patent/AU2021100491A4/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114265124A (en) * | 2021-12-30 | 2022-04-01 | 成都理工大学 | Unfavorable geologic body positioning method based on time domain transient electromagnetic probability inversion |
| CN114265124B (en) * | 2021-12-30 | 2022-08-02 | 成都理工大学 | Unfavorable geologic body positioning method based on time domain transient electromagnetic probability inversion |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2021100491A4 (en) | A method for analyzing equivalence phenomenon of electrical source transient electromagnetic method | |
| CN103645249B (en) | Online fault detection method for reduced set-based downsampling unbalance SVM (Support Vector Machine) transformer | |
| US20100058257A1 (en) | Topology optimization method using equivalent static loads | |
| Lu et al. | A self-adaptive genetic algorithm to estimate JA model parameters considering minor loops | |
| CN107909194B (en) | System-level testability design multi-objective optimization method | |
| Hyeon et al. | Short-term speed forecasting using vehicle wireless communications | |
| GB2508560A (en) | Method and device for determining the defect type of a partial discharge | |
| CN104407273A (en) | Electric energy quality disturbance source positioning method considering monitoring reliability | |
| CN115166839A (en) | Magnetotelluric sounding method power spectrum intelligent selection method based on deep learning classification | |
| CN104573219A (en) | Method for calculating direct-current transmission line electric field intensity and radio interference | |
| CN112232011B (en) | Wide-frequency-band electromagnetic response self-adaptive determination method and system of integrated circuit | |
| CN114178905A (en) | Milling cutter wear loss prediction method and system | |
| US9384314B2 (en) | Reduction of warpage of multilayered substrate or package | |
| CN113360412A (en) | Test scene selection method and device, electronic equipment and storage medium | |
| KR20130076490A (en) | Adaptive estimation method of local source impedance for double-circuit transmission line systems | |
| CN101614799B (en) | Signal separation and selection method applied in current sensor angular difference on-line monitoring system | |
| EP2429218A1 (en) | Detection signal delay method, detection device and encoder | |
| CN108268744B (en) | Kriging-based frame circuit breaker robustness parameter design method | |
| CN117351321A (en) | Single-stage lightweight subway lining cavity recognition method and related equipment | |
| Hwang et al. | A new machine condition monitoring method based on likelihood change of a stochastic model | |
| CN115684855A (en) | Electric power equipment internal insulation defect discharge quantity quantification method and system based on twin model | |
| CN106326278A (en) | Data exception judgment method and device | |
| US9773086B1 (en) | Methods, systems, and articles of manufacture for implementing coplanar waveguide transmission lines in electronic designs | |
| Gao et al. | Robust design of electromagnetic wave absorber using the Taguchi method | |
| CN106777918A (en) | The inversion method of the function gradient structure material property based on guided wave and fuzzy algorithmic approach |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |