CN117454675A - Method, system and equipment for correcting constant-source transient electromagnetic response - Google Patents
Method, system and equipment for correcting constant-source transient electromagnetic response Download PDFInfo
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Abstract
The invention discloses a method, a system and equipment for correcting a constant-source transient electromagnetic response, and relates to the technical field of transient electromagnetic exploration; constructing an equivalent model; the parameters of the equivalent model include: the number of layers and thickness of the ground model; constructing an equivalent model objective function according to the response corresponding to the equivalent model under the acquisition parameters and the constant source transient electromagnetic response under the acquisition parameters; optimizing the equivalent model objective function by adopting an effective set method to obtain an optimal equivalent model; and determining the transient electromagnetic response of the central loop under the acquisition parameters by using the optimal equivalent model, and taking the transient electromagnetic response as the corrected transient electromagnetic response of the current measuring point. The invention can solve the problem of complex response caused by field source effect in the fixed source transient electromagnetic method.
Description
Technical Field
The invention relates to the technical field of transient electromagnetic exploration, in particular to a method, a system and equipment for correcting constant-source transient electromagnetic response.
Background
In the application scenes of mineral exploration, water resource detection, engineering exploration, non-explosive detection and the like, the transient electromagnetic method is an effective and widely applied geophysical technology. The method has the advantages of small volume effect, high working efficiency, strong adaptability and the like.
In transient electromagnetic detection, the most common forms of apparatus include a center return apparatus, a source return apparatus, and the like. The central loop device belongs to a dynamic source device and has the advantages of good coupling with the ground, simple response curve form, convenience in explanation and the like, but the measurement of each measuring point needs to move a transmitting loop, so that the field workload is large, the working efficiency is low, and the construction cost is high. The transmitting loop and the transmitting equipment of the fixed source loop device are fixed, and only the mobile receiving equipment performs measurement at different measuring points, so that the fixed source loop device has the advantages of high working efficiency and low construction cost, but the transient electromagnetic response of the fixed source loop device is complex and the abnormal response is not visual enough due to the non-uniformity of the primary transmitting field at different measuring points. Meanwhile, because the responses of different transmitting loops and different receiving positions are different, the response difference is obvious at the edge part of the transmitting loops, and the data is difficult to splice.
Based on the above-mentioned problems, it is needed to provide a standardized calibration method or system for the response of a stationary transient electromagnetic, which can eliminate the response complexity caused by the field source effect of the stationary transient electromagnetic, and further solve the problem that the splicing of the source transient electromagnetic data at the edge of the transmitting loop is difficult, so as to provide transient electromagnetic data with simple form and uniform magnitude for the analysis and subsequent quantitative interpretation of the transient electromagnetic response curve.
Disclosure of Invention
The invention aims to provide a method, a system and equipment for correcting a constant-source transient electromagnetic response, which can solve the problem that constant-source transient electromagnetic data are difficult to splice at the edge of a transmitting loop, and provide transient electromagnetic data with simple form and unified magnitude for transient electromagnetic response curve analysis and subsequent quantitative interpretation.
In order to achieve the above object, the present invention provides the following solutions:
a method of correcting a source transient electromagnetic response, comprising:
acquiring acquisition parameters of an acquisition device; the acquisition parameters include: transmitting loop side length, current and falling edge;
constructing an equivalent model; the parameters of the equivalent model include: the number of layers and thickness of the ground model;
constructing an equivalent model objective function according to the response corresponding to the equivalent model under the acquisition parameters and the constant source transient electromagnetic response under the acquisition parameters;
optimizing the equivalent model objective function by adopting an effective set method to obtain an optimal equivalent model;
and determining the transient electromagnetic response of the central loop under the acquisition parameters by using the optimal equivalent model, and taking the transient electromagnetic response as the corrected transient electromagnetic response of the current measuring point.
Optionally, the constructing an equivalent model objective function according to the response corresponding to the equivalent model under the acquisition parameters and the stationary source transient electromagnetic response under the acquisition parameters further includes:
using the formulaDetermining the response corresponding to the equivalent model;
wherein,response corresponding to the equivalent model, ρ 0 For the initial resistivity value, f is a field value function, L is the emission loop side length, I is the current, ground is the falling edge, N is the number of layers of the electrical model, and H is the thickness of the electrical model.
Optionally, the constructing an equivalent model objective function according to the response corresponding to the equivalent model under the acquisition parameters and the fixed source transient electromagnetic response under the acquisition parameters specifically includes:
using the formulaDetermining an equivalent model objective function;
wherein,for constant source transient electromagnetic response, C m Data weight matrix, < >>As an objective function, r is a transient electromagnetic response vector, r T Is the transpose of r.
Optionally, the optimizing the objective function of the equivalent model by using an active set method to obtain an optimal equivalent model specifically includes:
optimizing the equivalent model objective function by adopting an effective set method, and continuously adjusting the resistivity value to enable the equivalent model objective function to reach a minimum value;
and obtaining an optimal equivalent model according to the resistivity value corresponding to the minimum value.
A system for correcting a source transient electromagnetic response, comprising:
the acquisition parameter acquisition module is used for acquiring acquisition parameters of the acquisition device; the acquisition parameters include: transmitting loop side length, current and falling edge;
the equivalent model construction module is used for constructing an equivalent model; the parameters of the equivalent model include: the number of layers and thickness of the ground model;
the equivalent model objective function construction module is used for constructing an equivalent model objective function according to the response corresponding to the equivalent model under the acquisition parameters and the constant source transient electromagnetic response under the acquisition parameters;
the optimal equivalent model determining module is used for optimizing an equivalent model objective function by adopting an effective set method to obtain an optimal equivalent model;
and the transient electromagnetic response correction module is used for determining the central loop transient electromagnetic response under the acquisition parameters by utilizing the optimal equivalent model and taking the central loop transient electromagnetic response as the corrected transient electromagnetic response of the current measuring point.
A source-transient electromagnetic response correction apparatus comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, which when executed by the processor, implement the described method of source transient electromagnetic response correction.
Optionally, the memory is a computer readable storage medium.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the method, the system and the equipment for correcting the constant-source transient electromagnetic response provided by the invention utilize the optimal equivalent model to quickly perform standardized correction on the constant-source transient electromagnetic data, correct the constant-source loop transient electromagnetic response into the equivalent center loop transient electromagnetic response, eliminate the response complexity caused by the field source effect of the constant-source transient electromagnetic, solve the problem that the constant-source transient electromagnetic data is difficult to splice at the edge of the transmitting loop, and provide transient electromagnetic data with simple form and unified magnitude for transient electromagnetic response curve analysis and subsequent quantitative interpretation.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for calibrating electromagnetic response of a constant source transient;
FIG. 2 is a schematic view of an embodiment of an anomaly buried in the ground;
fig. 3 is a contour plot of the response plane at t=0.5 ms;
FIG. 4 is a schematic graph of the decay curve at typical points (-150 m,0 m);
fig. 5 is a contour plot of the corrected transient electromagnetic response plane.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a method, a system and equipment for correcting a constant-source transient electromagnetic response, which can solve the problem that constant-source transient electromagnetic data are difficult to splice at the edge of a transmitting loop, and provide transient electromagnetic data with simple form and unified magnitude for transient electromagnetic response curve analysis and subsequent quantitative interpretation.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the method for correcting the electromagnetic response of the source transient provided by the invention comprises the following steps:
s101, acquiring acquisition parameters of an acquisition device; the acquisition parameters include: the firing loop side length, current, and falling edge.
S102, constructing an equivalent model; the parameters of the equivalent model include: the number of layers and thickness of the earth model.
Using the formulaAnd determining the response corresponding to the equivalent model. Wherein,response corresponding to the equivalent model, ρ 0 For the initial resistivity value, f is a field value function, L is the emission loop side length, I is the current, ramp is the falling edge, N is the number of layers of the ground model, and H is the thickness of the ground model.
S103, constructing an equivalent model objective function according to the response corresponding to the equivalent model under the acquisition parameters and the constant source transient electromagnetic response under the acquisition parameters.
Using the formulaDetermining an equivalent model objective function; wherein (1)>For constant source transient electromagnetic response, C m Data weight matrix, < >>As an objective function, r is a transient electromagnetic response vector, r T Is the transpose of r.
S104, optimizing the equivalent model objective function by adopting an effective set method to obtain an optimal equivalent model.
Optimizing the equivalent model objective function by adopting an effective set method, and continuously adjusting the resistivity value to enable the equivalent model objective function to reach a minimum value; and obtaining an optimal equivalent model according to the resistivity value corresponding to the minimum value.
S105, determining the transient electromagnetic response of the central loop under the acquisition parameters by using the optimal equivalent model, and taking the transient electromagnetic response as the corrected transient electromagnetic response of the current measuring point.
The invention is described in further detail below with reference to a specific example.
S1, aiming at an abnormal body buried underground, as shown in FIG. 2, the ground background resistivity is 100 omega-m, the geometric dimension of the abnormal body is 100m multiplied by 30m, the center position is positioned at (-150 m, -150m, -100 m), the resistivity is 10 omega-m, a transmitting loop with the side length of 600 m multiplied by 600 m is adopted, the transmitting current is 18 amperes, the falling edge is 10 mu S, the measurement is completed with the point distance and the line distance of 25 m according to the fixed source loop measurement mode, the response plane contour map (FIG. 3) when t=0.5 ms and the attenuation curve (FIG. 4) of a typical measuring point positioned at (-150 m, -150m,0 m) are drawn, and the abnormal body is reflected on the response section, but is influenced by the field source effect, the response characteristic is complex, and the position of the abnormal body cannot be intuitively represented.
S2, setting the number of layers of the equivalent model as 10 layers, each layer has a thickness of [20m,50 m and (3) the following (1).
S3, taking an initial resistivity value of the equivalent model as 100 omega-m, and calculating a corresponding constant source loop transient electromagnetic response d of the equivalent model under the acquisition parameters of 600 m×600 m of the side length of the emission loop, 18 amperes of emission current and 10 mu S of the falling edge eq 。
S4, constructing an equivalent model objective function:
。
wherein d represents transient electromagnetic data, the superscripts "fix" and "eq" represent the constant source transient electromagnetic response and the response of the equivalent model respectively, C m Representing a matrix of data weights.
S5, respectively adopting data of different measuring points, carrying out objective function optimization by adopting an active set method, and continuously adjusting the model resistivity value to obtain transient electromagnetic data d with a constant source fix The optimal equivalent model resistivity rho is matched.
S6, calculating corresponding central loop transient electromagnetic response under the acquisition parameters of 600 m & lt 600 & gt m of the side length of the transmitting loop, 18 amperes of the transmitting current and 10 mu S of the falling edge according to the calculated optimized equivalent model for each measuring point, and taking the corresponding central loop transient electromagnetic response as the corrected transient electromagnetic response of the current measuring point, wherein the corrected transient electromagnetic response is well matched with the transient electromagnetic response (figure 4) of the central loop device, and the corrected response plane contour map (figure 5) obviously gets rid of the influence of the field source non-uniformity effect, so that the position of an abnormal body and the symmetry characteristics of the abnormal body can be intuitively reflected.
The standardized correction method for the constant source transient electromagnetic response can be used for rapidly carrying out standardized correction on the constant source transient electromagnetic data, correcting the constant source transient electromagnetic data into equivalent central loop transient electromagnetic data, effectively eliminating the influence of field source non-uniform effect, simplifying transient electromagnetic response, solving the problem of splicing the edge positions of the constant source transient electromagnetic data, and facilitating the subsequent morphological analysis and processing interpretation of data curves.
The method is based on the equivalent model, realizes standardized correction of the constant source transient electromagnetic data, eliminates response complexity caused by the field source effect, and provides convenience for analysis of abnormal curves.
The standardized correction method for the constant source transient electromagnetic data provided by the invention corrects the constant source transient electromagnetic data into equivalent central loop transient electromagnetic response data, and solves the problem of splicing the edge positions of the constant source transient electromagnetic data.
Corresponding to the method, the invention provides a constant source transient electromagnetic response correction system, which comprises:
the acquisition parameter acquisition module is used for acquiring acquisition parameters of the acquisition device; the acquisition parameters include: the firing loop side length, current, and falling edge.
The equivalent model construction module is used for constructing an equivalent model; the parameters of the equivalent model include: the number of layers and thickness of the earth model.
And the equivalent model objective function construction module is used for constructing an equivalent model objective function according to the response corresponding to the equivalent model under the acquisition parameters and the constant source transient electromagnetic response under the acquisition parameters.
And the optimal equivalent model determining module is used for optimizing the equivalent model objective function by adopting an effective set method to obtain an optimal equivalent model.
And the transient electromagnetic response correction module is used for determining the central loop transient electromagnetic response under the acquisition parameters by utilizing the optimal equivalent model and taking the central loop transient electromagnetic response as the corrected transient electromagnetic response of the current measuring point.
In order to execute the method corresponding to the above embodiment to achieve the corresponding functions and technical effects, the present invention further provides a source-fixed transient electromagnetic response correction device, including: at least one processor, at least one memory, and computer program instructions stored in the memory, which when executed by the processor, the method of correcting a source transient electromagnetic response.
The memory is a computer-readable storage medium.
Based on the above description, the technical solution of the present invention may be embodied in essence or a part contributing to the prior art or a part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method of the embodiments of the present invention. And the aforementioned computer storage medium includes: various media capable of storing program codes, such as a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. A method for correcting a stationary transient electromagnetic response, comprising:
acquiring acquisition parameters of an acquisition device; the acquisition parameters include: transmitting loop side length, current and falling edge;
constructing an equivalent model; the parameters of the equivalent model include: the number of layers and thickness of the ground model;
constructing an equivalent model objective function according to the response corresponding to the equivalent model under the acquisition parameters and the constant source transient electromagnetic response under the acquisition parameters;
optimizing the equivalent model objective function by adopting an effective set method to obtain an optimal equivalent model;
and determining the transient electromagnetic response of the central loop under the acquisition parameters by using the optimal equivalent model, and taking the transient electromagnetic response as the corrected transient electromagnetic response of the current measuring point.
2. The method according to claim 1, wherein the constructing an equivalent model objective function according to the response corresponding to the equivalent model under the acquisition parameters and the constant source transient electromagnetic response under the acquisition parameters further comprises:
using the formulaDetermining the response corresponding to the equivalent model;
wherein,response corresponding to the equivalent model, ρ 0 For the initial resistivity value, f is a field value function, L is the emission loop side length, I is the current, ramp is the falling edge, N is the number of layers of the ground model, and H is the thickness of the ground model.
3. The method for correcting the constant source transient electromagnetic response according to claim 2, wherein the constructing the objective function of the constant source transient electromagnetic response according to the response corresponding to the constant source model under the acquisition parameters and the constant source transient electromagnetic response under the acquisition parameters specifically comprises:
using the formulaDetermining an equivalent model objective function;
wherein,to fixSource transient electromagnetic response, C m Data weight matrix, < >>As an objective function, r is a transient electromagnetic response vector, r T Is the transpose of r.
4. The method for correcting the electromagnetic response of the constant source transient according to claim 1, wherein the optimizing the objective function of the equivalent model by using the active set method to obtain the optimal equivalent model specifically comprises:
optimizing the equivalent model objective function by adopting an effective set method, and continuously adjusting the resistivity value to enable the equivalent model objective function to reach a minimum value;
and obtaining an optimal equivalent model according to the resistivity value corresponding to the minimum value.
5. A system for correcting a source-specific transient electromagnetic response, comprising:
the acquisition parameter acquisition module is used for acquiring acquisition parameters of the acquisition device; the acquisition parameters include: transmitting loop side length, current and falling edge;
the equivalent model construction module is used for constructing an equivalent model; the parameters of the equivalent model include: the number of layers and thickness of the ground model;
the equivalent model objective function construction module is used for constructing an equivalent model objective function according to the response corresponding to the equivalent model under the acquisition parameters and the constant source transient electromagnetic response under the acquisition parameters;
the optimal equivalent model determining module is used for optimizing an equivalent model objective function by adopting an effective set method to obtain an optimal equivalent model;
and the transient electromagnetic response correction module is used for determining the central loop transient electromagnetic response under the acquisition parameters by utilizing the optimal equivalent model and taking the central loop transient electromagnetic response as the corrected transient electromagnetic response of the current measuring point.
6. A stationary transient electromagnetic response correction apparatus, comprising: at least one processor, at least one memory and computer program instructions stored in the memory, which when executed by the processor, implement a method of source transient electromagnetic response correction as claimed in any one of claims 1-4.
7. The apparatus of claim 6, wherein the memory is a computer readable storage medium.
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