CN114814953A - Time-shifting electromagnetic exploration observation system - Google Patents
Time-shifting electromagnetic exploration observation system Download PDFInfo
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- CN114814953A CN114814953A CN202110067836.3A CN202110067836A CN114814953A CN 114814953 A CN114814953 A CN 114814953A CN 202110067836 A CN202110067836 A CN 202110067836A CN 114814953 A CN114814953 A CN 114814953A
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- 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
- G01V3/08—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
- G01V3/081—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 the magnetic field is produced by the objects or geological structures
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Abstract
The embodiment of the application provides a time shift electromagnetic prospecting observation system, includes: the system comprises a three-component magnetic sensor and at least one receiving magnetic rod which are arranged underground in a target work area, and a data acquisition control system which is electrically connected with the three-component magnetic sensor and the receiving magnetic rod; the three-component magnetic sensor comprises at least one vertical component sensing unit used for sensing the electromagnetic data of the underground vertical direction of the target work area and two horizontal component sensing units used for sensing the electromagnetic data of different underground horizontal directions of the target work area respectively.
Description
Technical Field
The application relates to the field of geophysical exploration, in particular to a time-shifting electromagnetic exploration observation system.
Background
In the development process of oil and gas fields, the moving direction and range of oil, gas and water are monitored by utilizing an effective time-shifting geophysical exploration technical method, so that the recovery rate can be greatly improved, and the cost of oil and gas development is reduced. At present, the common technical means include methods such as tracer and seismic exploration, and have some limitations, such as: the tracer can not monitor the movement tracks and ranges of water and gas in the whole process in real time; seismic exploration methods are expensive, have limited operations in oil fields, and the like. According to experimental data, the resistivity of an oil reservoir changes relatively greatly after a large amount of water or gas enters the oil reservoir, and if a method capable of accurately measuring the resistivity of the oil reservoir is used, detection of water waves, gas waves and the range of the water waves and the gas waves can be achieved.
Therefore, the inventor provides a time-shifting electromagnetic exploration observation system by virtue of experience and practice of related industries for many years, so as to overcome the defects of the prior art.
Disclosure of Invention
To the problems in the prior art, the application provides a time-shifting electromagnetic exploration observation system which can quickly, accurately and conveniently acquire time-shifting electromagnetic exploration data under a strong electromagnetic interference environment.
In order to solve the technical problem, the application provides the following technical scheme:
in a first aspect, the present application provides a time-lapse electromagnetic survey observation system, comprising: the system comprises a three-component magnetic sensor and at least one receiving magnetic rod which are arranged underground in a target work area, and a data acquisition control system which is electrically connected with the three-component magnetic sensor and the receiving magnetic rod;
the three-component magnetic sensor comprises at least one vertical component sensing unit for sensing the electromagnetic data in the underground vertical direction of the target work area and two horizontal component sensing units for respectively sensing the electromagnetic data in different underground horizontal directions of the target work area.
Further, the three-component magnetic sensor is disposed at a middle position of the electrode rod.
Further, the main body of the electrode rod is in a cylindrical shape and can enter the shallow underground well of the target work area.
Furthermore, two ends of the electrode rod are respectively provided with an annular non-polarized electrode.
Furthermore, the electrode rod is made of glass fiber materials.
Furthermore, an armored cable penetrates through the electrode rod and is used for connecting the three-component magnetic sensor and the data acquisition control system.
And further, the solar energy power supply system is used for supplying power to the data acquisition control system and is electrically connected with the data acquisition control system.
And the wireless signal receiving and transmitting terminal is used for communicating with a wireless network and is in signal connection with the data acquisition control system.
Further, the wireless signal transceiver terminal also comprises a remote terminal control system for receiving signals transmitted by the wireless signal transceiver terminal from the wireless network.
Furthermore, a signal modulation and demodulation unit is arranged between the line signal receiving and transmitting terminal and the data acquisition control system.
According to the technical scheme, the time-shifting electromagnetic exploration observation system is provided, accurate induction is carried out on magnetotelluric signals through the three-component magnetic sensor arranged underground of the target work area, electromagnetic interference and human noise from the ground are reduced by means of the natural filter of the ground, and data with high signal-to-noise ratio are obtained.
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, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an observation system for time-lapse electromagnetic surveying according to the present application;
FIG. 2 is a second schematic structural diagram of a time-lapse electromagnetic survey observation system according to the present application;
FIG. 3 is a schematic diagram of a three-component magnetic sensor according to the present application;
FIG. 4 is a schematic diagram of an assembled three-component magnetic sensor according to the present application;
FIG. 5 is a graph illustrating the variation of ambient noise intensity with sensor burying depth according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, 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 partial embodiments of the present application, but not all 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.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used in other meanings besides orientation or positional relationship, for example, the term "upper" may also be used in some cases to indicate a certain attaching or connecting relationship. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The problems that qualified electromagnetic data cannot be acquired due to strong electromagnetic interference in an oil area in the prior art, and the electromagnetic exploration method and the wide application in oil field development are restricted are considered.
In order to be able to quickly, accurately and conveniently acquire time-shifting electromagnetic survey data in a strong electromagnetic interference environment, the application provides an embodiment of a time-shifting electromagnetic survey observation system, referring to fig. 1 and fig. 2, in the embodiment, the time-shifting electromagnetic survey observation system is specifically arranged in a three-component magnetic sensor and at least one receiving magnetic rod under a target work area, and a data acquisition control system electrically connected with the three-component magnetic sensor and the receiving magnetic rod.
The three-component magnetic sensor comprises at least one vertical component sensing unit for sensing the electromagnetic data in the underground vertical direction of the target work area and two horizontal component sensing units for respectively sensing the electromagnetic data in different underground horizontal directions of the target work area.
It is understood that the prior art uses a magnetic sensor assembled with a single component design, about 1 meter long and 6-8 cm in diameter, which has only a vertical component (Hz) and can only be used in vertical wells, while according to the technical requirements of geophysical prospecting, the embedded horizontal component (Hx, Hy) magnetic sensor requires well support with a diameter of about 1 meter, and therefore, this is impossible to achieve in actual practice.
Optionally, referring to fig. 3, the three-component magnetic sensor of the present application includes at least one vertical component sensing unit for sensing the electromagnetic data in the underground vertical direction of the target work area and two horizontal component sensing units for respectively sensing the electromagnetic data in different underground horizontal directions of the target work area, so as to accurately sense the electromagnetic data in the underground of the target work area.
Optionally, the three-component magnetic sensor of the present application has a diameter of 10-12 centimeters and a length of about 1.5 meters.
Alternatively, the receiving magnetic rod may be an existing vertical electric dipole.
Optionally, the data acquisition control system may be an electromagnetic data acquisition station.
From the above description, according to the time-shifting electromagnetic exploration observation system provided by the embodiment of the application, the magnetotelluric signal is accurately sensed by the three-component magnetic sensor arranged underground of the target work area, and by means of the natural filter of the earth, the electromagnetic interference and the human noise from the ground are reduced, so that the data with high signal-to-noise ratio is obtained.
As a preferred embodiment, referring to fig. 4, the three-component magnetic sensor is disposed at the middle position of an electrode rod, wherein the electrode rod has a cylindrical shape capable of entering the shallow well under the target work area, and both ends of the electrode rod are respectively provided with an annular non-polarized electrode, the electrode rod is made of glass fiber material, and an armored cable is further disposed through the electrode rod and is used for connecting the three-component magnetic sensor and the data acquisition control system, whereby, by using the annular non-polarized electrode, the non-polarized electrode is mounted at both ends of a glass fiber electrode rod with a diameter of about 6-8 cm and a length of 5-15 m, and then connected with other sensors through the armored cable, the three-component magnetic sensor can also be mounted at the middle position of the electrode rod, and the integrated assembly of the electromagnetic sensor is realized.
As a preferred embodiment, the system further comprises a solar power supply system for supplying power to the data acquisition control system, wherein the solar power supply system is electrically connected with the data acquisition control system so as to reduce the intensity and cost of system maintenance.
As a preferred embodiment, the system further comprises a wireless signal transceiving terminal for communicating with a wireless network, and the wireless signal transceiving terminal is in signal connection with the data acquisition control system.
As a preferred embodiment, the wireless signal transceiver further comprises a remote terminal control system for receiving the signal transmitted by the wireless signal transceiver from the wireless network.
As a preferred implementation manner, a signal modulation and demodulation unit is disposed between the line signal transceiving terminal and the data acquisition control system signal.
In addition, the wireless signal receiving and transmitting terminal can remotely set acquisition parameters through a network, then data acquisition is started, the data is temporarily stored in a data acquisition station, a remote terminal user can download the data periodically or aperiodically through the network, after the remote control debugging is successful, the time-shifting electromagnetic exploration system is started, and the operation state of the system is regularly maintained and monitored.
In some possible embodiments of the present application, the method for performing survey observation by using the time-shift electromagnetic survey observation system of the present application may be:
(1) evaluating the background noise intensity in an exploration area, analyzing a curve (see figure 5) of attenuation ratio of the background noise to the embedding depth of the sensor in the exploration area, and determining the embedding depth of the sensor on the basis;
(2) protecting the embedded electric and magnetic sensors and testing various technical indexes before embedding;
(3) embedding the electric and magnetic sensors to the designed depth, and then testing the background noise intensity and the instrument performance index;
(4) installing a solar power supply system, a wireless data transmission system, remote control and data transmission tests, and testing;
(5) and the time-shifting electromagnetic exploration data acquisition system normally operates.
Optionally, the data observation apparatus of the present invention may be applied to, but not limited to, an electromagnetic prospecting method for time shift such as a magnetotelluric Method (MT), a controlled acoustic magnetotelluric method (CSAMT), a time-frequency electromagnetic method (TFEM), a Transient Electromagnetic Method (TEM), and a complex resistivity method (CR/SIP).
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (10)
1. A time-lapse electromagnetic survey observation system, comprising: the system comprises a three-component magnetic sensor and at least one receiving magnetic rod which are arranged underground in a target work area, and a data acquisition control system which is electrically connected with the three-component magnetic sensor and the receiving magnetic rod;
the three-component magnetic sensor comprises at least one vertical component sensing unit for sensing the electromagnetic data in the underground vertical direction of the target work area and two horizontal component sensing units for respectively sensing the electromagnetic data in different underground horizontal directions of the target work area.
2. A time-lapse electromagnetic survey observation system according to claim 1, wherein the three-component magnetic sensor is disposed at a middle position of the electrode rod.
3. A time-lapse electromagnetic survey observation system according to claim 2, wherein the body of the electrode rod is shaped as a cylinder that can enter a shallow well in the subsurface of the target work area.
4. A time-lapse electromagnetic surveying observation system according to claim 3, wherein annular non-polarized electrodes are provided at both ends of the electrode rod, respectively.
5. The time-lapse electromagnetic survey observation system of claim 2, wherein the electrode rod is made of a glass fiber material.
6. The time-lapse electromagnetic survey observation system according to claim 2, wherein an armored cable is further provided in the electrode rod, and the armored cable is used for connecting the three-component magnetic sensor and the data acquisition control system.
7. A time-lapse electromagnetic survey observation system according to claim 1, further comprising a solar power supply system for supplying power to the data acquisition control system, the solar power supply system being electrically connected to the data acquisition control system.
8. A time-lapse electromagnetic survey observation system according to claim 1, further comprising a wireless signal transceiving terminal for communicating with a wireless network, the wireless signal transceiving terminal being in signal connection with the data acquisition control system.
9. A time-lapse electromagnetic survey observation system according to claim 8, further comprising a remote terminal control system for receiving signals transmitted by the wireless signal transceiving terminals from the wireless network.
10. The time-lapse electromagnetic survey observation system according to claim 8, wherein a signal modem unit is provided between the line signal transceiver terminal and the data acquisition control system signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110067836.3A CN114814953A (en) | 2021-01-19 | 2021-01-19 | Time-shifting electromagnetic exploration observation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110067836.3A CN114814953A (en) | 2021-01-19 | 2021-01-19 | Time-shifting electromagnetic exploration observation system |
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| CN114814953A true CN114814953A (en) | 2022-07-29 |
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| CN202110067836.3A Pending CN114814953A (en) | 2021-01-19 | 2021-01-19 | Time-shifting electromagnetic exploration observation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117761784A (en) * | 2024-02-19 | 2024-03-26 | 山东省煤田地质局第三勘探队 | Device for exploring fixed magnetic rod by geophysical magnetotelluric method |
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2021
- 2021-01-19 CN CN202110067836.3A patent/CN114814953A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117761784A (en) * | 2024-02-19 | 2024-03-26 | 山东省煤田地质局第三勘探队 | Device for exploring fixed magnetic rod by geophysical magnetotelluric method |
| CN117761784B (en) * | 2024-02-19 | 2024-05-03 | 山东省煤田地质局第三勘探队 | Device for exploring fixed magnetic rod by geophysical magnetotelluric method |
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