Seismic instrument signal input channel variable impedance device, equipment and method

Abstract

The invention discloses a seismic instrument signal input channel variable impedance device, equipment and a method. The device comprises an impedance matching board and a data acquisition board, the impedance matching plate comprises a plurality of groups of impedance networks which are connected in parallel and have different direct-current impedances; each impedance network comprises an impedance network module and an impedance electronic switch which are connected; the data acquisition board is connected with the multi-path impedance electronic switch and can test the resistance of the connected analog geophone, and the impedance electronic switch of the impedance network needing to be accessed is determined and controlled to be switched on according to the size of the tested resistance and the mapping relation between the preset test resistance range and the direct-current impedance. The impedance of the signal input channel of the seismic exploration instrument is adapted according to the type of the used analog geophone, so that the optimal impedance matching relation is achieved, and the optimal seismic wave pickup effect is achieved. The method is suitable for all known electromagnetic simulation geophones and piezoelectric geophones with different series-parallel connection combination modes and different direct-current resistors.

Description

Technical Field

[0001] The present invention relates to the technical field of geophysical exploration, and in particular to a variable impedance device, equipment and method for a signal input channel of a seismic instrument. Background Art

[0002] In the current petroleum geophysical exploration industry, seismic instruments and analog geophones are manufactured by numerous manufacturers and models, with varying performance and parameters. The matching relationship between the DC input impedance of the seismic instrument's signal input channel and the DC resistance of the analog geophone directly impacts the seismic signal pickup performance of the seismic instrument system, particularly the amplitude fidelity of the seismic signal. Currently, the DC input impedance of conventional seismic instrument signal input channels is typically fixed, such as 20kΩ, 40kΩ, and 43kΩ. This is generally not user-selectable or adjustable; rather, it is a fixed parameter determined at the factory.

[0003] In contrast, the DC resistance of analog geophones spans a wide range, from hundreds of ohms to thousands of ohms. Multiple combinations of analog geophones may be used in a single seismic exploration project, with DC resistance values ​​ranging from as low as 100 to 200 ohms to as high as several thousand or even tens of thousands of ohms.

[0004] When seismic instruments with different input impedances are used with analog geophones with the same DC resistance value, or when seismic instruments with the same input impedance are used with analog geophones with different DC resistance values, even if the sensitivity and other parameters of the analog geophones are the same, the different impedance matching relationships between the seismic instruments and the analog geophones will result in different pickup effects of the seismic instrument system for the same excitation signal. Summary of the Invention

[0005] In order to realize automatic impedance switching of a seismic instrument signal input channel, an embodiment of the present invention provides a variable impedance device, apparatus, and method for a seismic instrument signal input channel.

[0006] In a first aspect, an embodiment of the present invention provides a variable impedance device for a seismic instrument signal input channel, which is used to connect a seismic instrument host and an analog seismic detector, comprising:

[0007] Impedance matching board and data acquisition board;

[0008] The impedance matching board includes multiple groups of impedance networks with different DC impedances connected in parallel;

[0009] Each of the impedance networks includes an impedance network module and an impedance electronic switch connected to each other;

[0010] The data acquisition board is connected to multiple impedance electronic switches and can test the resistance of the connected simulated seismic detector. According to the size of the tested resistance and the mapping relationship between the preset test resistance range and DC impedance, the impedance electronic switch of the impedance network to be connected is determined and controlled to be turned on.

[0011] In one or some optional embodiments, the variable impedance device of the seismic instrument signal input channel, each of the impedance network modules includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor and a third capacitor;

[0012] The first resistor and the second resistor are connected to form a first branch, and a common end connected to the first resistor and the second resistor is grounded;

[0013] The first capacitor and the second capacitor are connected to form a second branch, and a common terminal connected to the first capacitor and the second capacitor is grounded;

[0014] The third capacitor constitutes a third branch;

[0015] The first branch, the second branch and the third branch are connected in parallel;

[0016] The third resistor is connected between the first resistor and the first capacitor;

[0017] The fourth resistor is connected between the second resistor and the second capacitor;

[0018] The fifth resistor is connected between the first capacitor and the third capacitor;

[0019] The sixth resistor is connected between the second capacitor and the third capacitor.

[0020] In one or some optional embodiments, the first resistor and the second resistor have the same resistance value;

[0021] The first capacitor and the second capacitor have the same capacitance.

[0022] In one or some optional embodiments, the impedance matching board further includes a common mode coil;

[0023] The common mode coil is connected to the signal input ends of the multiple impedance networks.

[0024] In one or some optional embodiments, the data acquisition board includes a main control unit and a test unit;

[0025] The main control unit is connected to the test unit and the impedance electronic switch of the impedance network;

[0026] The testing unit is used to test the resistance of the connected simulated seismic detector;

[0027] The main control unit is used to determine and control the impedance electronic switch of the impedance network to be connected to conduct according to the size of the tested resistance and the mapping relationship between the preset test resistance range and the DC impedance.

[0028] In one or some optional embodiments, the data acquisition board further includes a communication module and a mode switching switch;

[0029] The communication module and the mode switching switch are respectively connected to the main control unit;

[0030] The communication module is connected to the main control unit and is capable of receiving a switching signal from the connected handheld controller and sending the signal to the main control unit;

[0031] The main control unit is further configured to control the mode switching switch to switch to the manual mode according to the received switching signal.

[0032] In one or some optional embodiments, the communication module is further capable of receiving an impedance selection signal from a connected handheld controller and sending the signal to the main control unit;

[0033] The main control unit is further configured to control the impedance electronic switch of the impedance network to be connected to conduct according to the received impedance selection signal.

[0034] In one or some optional embodiments, the data acquisition board further includes a data acquisition switch and a data storage unit;

[0035] The communication module is also capable of receiving data acquisition signals from the connected handheld device and sending the data acquisition signals to the main control unit;

[0036] The main control unit is further used to receive the data acquisition signal and control the data acquisition switch to be turned on.

[0037] In one or some optional embodiments, the data acquisition board further includes an analog-to-digital converter;

[0038] The analog-to-digital converter is connected to the signal output ends of the multiple impedance networks.

[0039] In a second aspect, an embodiment of the present invention provides a variable impedance seismic instrument, comprising: a seismic instrument host and the variable impedance device for the seismic instrument signal input channel described in the first aspect above.

[0040] In a third aspect, an embodiment of the present invention provides a seismic data acquisition method for a variable impedance device for a signal input channel of a seismic instrument, comprising:

[0041] Connect the variable impedance device of the seismic instrument signal input channel to the seismic instrument host;

[0042] Connecting simulated seismic geophones of different series-parallel combinations and different DC resistances to the variable impedance device of the seismic instrument signal input channel;

[0043] The resistance of any simulated seismic detector to be measured is tested through the variable impedance device of the seismic instrument signal input channel, and an impedance network corresponding to the DC impedance is connected according to the magnitude of the tested resistance and the mapping relationship between the preset test resistance range and the DC impedance;

[0044] Data acquisition is performed on the seismic signal picked up by the simulated seismic geophone through the variable impedance device of the seismic instrument signal input channel.

[0045] The beneficial effects of the above technical solutions provided by the embodiments of the present invention include at least:

[0046] The variable impedance device for the signal input channel of a seismic instrument provided in an embodiment of the present invention, after being connected to the seismic instrument host and the simulated seismic detector, can automatically switch to an impedance network that matches the simulated seismic detector according to the test resistance of the connected simulated seismic detector. This device can adapt the impedance of the seismic exploration instrument signal input channel according to the type of simulated seismic detector used to achieve an optimal impedance matching relationship, thereby achieving an optimal seismic wave pickup effect. This device has strong applicability. By rationally configuring impedance network modules with different impedance networks, the device can be applied to all known electromagnetic simulated seismic detectors and piezoelectric detectors with different series and parallel combinations and different DC resistances.

[0047] The variable impedance device for the seismic instrument signal input channel provided in an embodiment of the present invention can also manually select the impedance network of the seismic instrument signal input channel according to user needs, and conduct comparative research experiments on data acquisition effects under multiple impedance modes for the same acquisition circuit, providing strong data support for the impedance usage plan for seismic data acquisition in different construction areas.

[0048] Other features and advantages of the present invention will be described in the following description and will become apparent from the description or will be understood through implementation of the present invention. The purposes and other advantages of the present invention can be realized and obtained through the structures particularly pointed out in the written description, claims, and drawings.

[0049] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0051] Figure 1 Schematic diagram of the structure of a variable impedance device for a signal input channel of a seismic instrument according to an embodiment of the present invention;

[0052] Figure 2 Schematic diagram of the structure of the impedance matching plate of the variable impedance device of the signal input channel of the seismic instrument in an embodiment of the present invention;

[0053] Figure 3 A schematic structural diagram of an impedance network module of an impedance matching board provided in an embodiment of the present invention;

[0054] Figure 4 A schematic diagram of the structure of a seismic data acquisition system provided by an embodiment of the present invention;

[0055] in:

[0056] 10. Variable impedance device for the input channel of the seismic instrument; 101. Impedance matching board; 102. Data acquisition board; 20. Seismic instrument host; 30. Analog seismic geophone; 40. Hand controller. DETAILED DESCRIPTION

[0057] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0058] The inventors discovered that, assuming constant parameters such as the excitation signal amplitude and the sensitivity of the analog geophone, to achieve consistent pickup of the same excitation signal across different seismic instrument systems, the impedance of the seismic instrument's signal input channel must be significantly increased when using an analog geophone with a higher DC resistance. Although piezoelectric geophones are also analog geophones, their operating mechanism differs significantly from traditional electromagnetic analog geophones. They are capacitive sensors and therefore place different requirements on the impedance network of the seismic instrument's signal input channel.

[0059] Currently, in seismic exploration projects involving mixed terrains such as land and mudflats, rivers, lakes, or offshore areas, electromagnetic analog geophones and numerous piezoelectric geophones are commonly used simultaneously. However, the seismic instrument's signal input channel typically uses only one type of resistor-capacitor network, compatible only with electromagnetic analog geophones. This severely impacts the instrument's ability to capture seismic waves, and consequently, the quality of seismic data. To address this issue, the inventors have developed a variable impedance device, apparatus, and method for the seismic instrument's signal input channel, addressing the inability to select or adjust the DC input impedance of the seismic instrument's signal input channel according to user needs during seismic data acquisition.

[0060] Example 1

[0061] Reference Figure 1 and Figure 4 As shown, an embodiment of the present invention provides a variable impedance device 10 for a seismic instrument signal input channel, which is used to connect a seismic instrument host 20 and a simulated seismic detector 30. The device includes:

[0062] Impedance matching board 101 and data acquisition board 102;

[0063] The impedance matching board 101 includes multiple groups of impedance networks with different DC impedances connected in parallel;

[0064] Each of the impedance networks includes an impedance network module and an impedance electronic switch connected to each other;

[0065] The data acquisition board 102 is connected to multiple impedance electronic switches and is capable of testing the resistance of the connected simulated seismic detector 30. According to the size of the tested resistance and the mapping relationship between the preset test resistance range and the DC impedance, the impedance electronic switch of the impedance network to be connected is determined and controlled to be turned on.

[0066] In the embodiment of the present invention, the number of impedance networks on the impedance matching board 101 and the DC impedance of each impedance network module can be set according to actual needs. For example, it can be based on Figure 2As shown, the variable impedance device 10 for the seismic instrument's signal input channel offers eleven impedance network modules, Z1 through Z11, for user selection. These include impedance network modules for mainstream seismic instrument signal input channels, various impedance network modules with higher impedance values, and specialized impedance network modules suitable for piezoelectric geophones. These various impedance network modules reside on a single circuit board, but during the seismic instrument's acquisition process, only one set is connected at any given moment; the others remain disconnected. For example, these eleven impedance network modules can be ten resistor-capacitor network modules adapted for electromagnetic analog seismic detectors with DC impedance of Z1 (20KΩ), Z2 (40KΩ), Z3 (60KΩ), Z4 (80KΩ), Z5 (100KΩ), Z6 (120KΩ), Z7 (140KΩ), Z8 (160KΩ), Z9 (180KΩ) and Z10 (200KΩ), and one resistor-capacitor network module Z11 (5MΩ) adapted for piezoelectric detectors.

[0067] In an embodiment of the present invention, the data acquisition board 102 is respectively connected to the impedance electronic switches S1 to S11 including the above-mentioned multiple different impedance networks, and the switches are switched through the control in the data acquisition circuit, so as to adapt the impedance of the signal input channel of the seismic exploration instrument according to the type of analog seismic detector used, so as to achieve the optimal impedance matching relationship and thus achieve the optimal seismic wave picking effect.

[0068] When the variable impedance device 10 for the signal input channel of the seismic instrument is specifically manufactured, the impedance matching board 101 and the data acquisition board 102 can be connected together through a data socket and fixed with screws.

[0069] In one embodiment, referring to Figure 3 As shown, each impedance network module in the impedance matching board includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2 and a third capacitor C3;

[0070] The first resistor R1 and the second resistor R2 are connected to form a first branch, and a common end where the first resistor R1 and the second resistor R2 are connected is grounded;

[0071] The first capacitor C1 and the second capacitor C2 are connected to form a second branch, and a common terminal where the first capacitor C1 and the second capacitor C2 are connected is grounded;

[0072] The third capacitor C3 constitutes a third branch;

[0073] The first branch, the second branch and the third branch are connected in parallel;

[0074] The third resistor R3 is connected between the first resistor R1 and the first capacitor C1;

[0075] The fourth resistor R4 is connected between the second resistor R2 and the second capacitor C2;

[0076] The fifth resistor R5 is connected between the first capacitor C1 and the third capacitor C2;

[0077] The sixth resistor R6 is connected between the second capacitor C2 and the third capacitor C3.

[0078] In one specific embodiment, the first resistor R1 and the second resistor R2 have the same resistance value; the first capacitor C1 and the second capacitor C2 have the same capacitance value. The first resistor R1, the second resistor R2, the first capacitor C1, and the second capacitor C2 primarily function to remove common-mode interference, while the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the third capacitor C3 function as low-pass filters. Furthermore, the DC input impedance of the impedance network module primarily depends on the resistance values ​​of the first resistor R1 and the second resistor R2. For example, if the DC impedance is 20KΩ, the resistance values ​​of the first resistor R1 and the second resistor R2 are both set to 10KΩ.

[0079] In a specific embodiment, the impedance matching board 101 may further include a common mode coil connected to the signal input terminals of the plurality of impedance networks, and may be used to remove common mode interference signals.

[0080] In one embodiment, the data acquisition board 102 includes a main control unit and a test unit;

[0081] The main control unit is connected to the test unit and the impedance electronic switch of the impedance network;

[0082] The testing unit is used to test the resistance of the connected simulated seismic detector;

[0083] The main control unit is used to determine and control the impedance electronic switch of the impedance network to be connected to conduct according to the size of the tested resistance and the mapping relationship between the preset test resistance range and the DC impedance.

[0084] In one embodiment, the data acquisition board 102 further includes a communication module and a mode switching switch;

[0085] The communication module and the mode switching switch are respectively connected to the main control unit;

[0086] The communication module is connected to the main control unit and is capable of receiving a switching signal from the handheld controller 40 to which it is connected and sending the signal to the main control unit;

[0087] The main control unit is further configured to control the mode switching switch to switch to the manual mode according to the received switching signal.

[0088] In one embodiment, the communication module can also receive an impedance selection signal from the connected wristband 40 and send it to the main control unit;

[0089] The main control unit is further configured to control the impedance electronic switch of the impedance network to be connected to conduct according to the received impedance selection signal.

[0090] The inventor discovered that in the current prior art, there is a lack of a seismic instrument with variable impedance when conducting comparative tests or research on the receiving effects of different input impedances of the same acquisition circuit. Based on this, the inventor further designed the variable impedance device of the seismic instrument signal input channel. By setting a mode switching switch and a handheld controller 40, the handheld controller 40 communicates with the data acquisition board to send an impedance selection signal. Thus, the variable impedance device of the seismic instrument signal input channel can be used by the user to manually select the impedance network of the seismic instrument signal input channel through the handheld controller 40 according to user needs, and conduct comparative research tests on data acquisition effects of the same acquisition circuit under multiple impedance modes, providing strong data support for the impedance usage plan for seismic data acquisition in different construction areas.

[0091] In one embodiment, the data acquisition board 102 further includes a data acquisition switch and a data storage unit;

[0092] The communication module can also receive data acquisition signals from the connected wristband 40 and send them to the main control unit;

[0093] The main control unit is further used to receive the data acquisition signal and control the data acquisition switch to be turned on.

[0094] In a specific embodiment, the data acquisition board 102 further includes an analog-to-digital converter;

[0095] The analog-to-digital converter is connected to the signal output terminals of the plurality of impedance networks. The analog-to-digital converter performs sampling, quantization and encoding to convert the collected continuous analog signal of the seismic wave into a discrete digital signal.

[0096] In a specific embodiment, the data acquisition board 102 may further include a clock unit for achieving time synchronization, a power distribution unit for providing power, etc. The specific implementation of the main control unit, test unit, communication module, data storage unit, analog-to-digital converter, clock unit, and power distribution unit of the data acquisition board 102 may be referred to the detailed description of the relevant art.

[0097] Reference Figure 4As shown, the variable impedance device 10 for the seismic instrument signal input channel can be applied to a seismic data acquisition system to collect seismic data. The specific implementation of the seismic instrument host 20 can refer to the relevant descriptions in the prior art. The analog seismic detector 30 in the system can be an electromagnetic analog seismic detector or a piezoelectric seismic detector. The specific implementation of the handheld controller 40 can also refer to the detailed descriptions in the prior art and is not specifically limited here.

[0098] In order to provide a clearer and more complete description of the variable impedance device for the signal input channel of a seismic instrument provided by an embodiment of the present invention, the following describes a process of automatically implementing seismic data acquisition using the variable impedance device for the signal input channel of a seismic instrument as an example:

[0099] Connect the variable impedance device 10 for the seismic instrument signal input channel to the seismic instrument host 20, configure the device with production parameters such as sampling rate, filter type, and preamplifier gain according to user requirements, and turn the mode switch for the input impedance selection of the device to automatically select the impedance network;

[0100] After correctly connecting the external analog seismic detectors 30 of different series-parallel combinations and different DC resistances to the variable impedance device 10 of the seismic instrument signal input channel, ensure that all external electromagnetic analog seismic detectors connected to the device are well coupled with the ground or that the piezoelectric geophones have been properly laid out;

[0101] The connected external analog seismic geophone 30 is automatically tested through the variable impedance device 10 of the seismic instrument signal input channel. After the test is completed, the geophone (string) with abnormal test value is immediately replaced according to the value of the tested resistance until the test values ​​are normal, and the DC resistance value R of the connected normal geophone (string) is recorded;

[0102] According to the DC resistance R of the connected normal detector (string), Figure 2 The multi-channel impedance electronic switches (S1-S11) of the eleven impedance network modules shown are controlled and switched by the main control unit of the data acquisition board 102. From left to right, the impedance network modules are Z1 (20KΩ), Z2 (40KΩ), Z3 (60KΩ), Z4 (80KΩ), Z5 (100KΩ), Z6 (120KΩ), Z7 (140KΩ), Z8 (160KΩ), Z9 (180KΩ), Z10 (200KΩ), and Z11 (5MΩ). The main control unit of the data acquisition board 102 determines and controls the impedance electronic switches of the impedance network to be connected based on the value of the resistance being tested and the mapping relationship between the preset test resistance range and DC impedance, thereby automatically switching the impedance network modules.

[0103] The mapping relationship between the preset test resistance range and DC impedance may be:

[0104] R≦1KΩ corresponds to Z1, that is, the impedance network module Z1 is automatically switched;

[0105] 1KΩ﹤R≦2KΩ corresponds to Z2, which means the impedance network module Z2 is automatically switched;

[0106] 2KΩ﹤R≦3KΩ corresponds to Z3, that is, automatic switching impedance network module Z3;

[0107] 3KΩ﹤R≦4KΩ corresponds to Z4, that is, automatic switching impedance network module Z4;

[0108] 4KΩ﹤R≦5KΩ corresponds to Z5, that is, automatic switching impedance network module Z5;

[0109] 5KΩ﹤R≦6KΩ corresponds to Z6, that is, automatic switching impedance network module Z6;

[0110] 6KΩ﹤R≦7KΩ corresponds to Z7, that is, automatic switching impedance network module Z7;

[0111] 7KΩ﹤R≦8KΩ corresponds to Z8, that is, automatic switching impedance network module Z8;

[0112] 8KΩ﹤R≦9KΩ corresponds to Z9, that is, automatic switching impedance network module Z9;

[0113] R>9KΩ corresponds to Z10, that is, automatic switching impedance network module Z10;

[0114] When the piezoelectric detector is connected, the impedance network module Z11 is automatically switched.

[0115] After the automatic switching of the impedance network module is completed, the variable impedance device 10 of the seismic instrument signal input channel automatically turns on the data acquisition switch to perform seismic data acquisition.

[0116] In order to provide a clearer and more complete description of the variable impedance device for the signal input channel of a seismic instrument provided by an embodiment of the present invention, the following describes a process of manually implementing seismic data acquisition using the variable impedance device for the signal input channel of a seismic instrument as an example:

[0117] Connect the variable impedance device 10 for the seismic instrument signal input channel to the seismic instrument host 20, configure the device with production parameters such as sampling rate, filter type, and preamplifier gain according to user requirements, and turn the mode switch for the input impedance selection of the device to the manual selection impedance network. Alternatively, the mode switch of the device can be activated by using the handheld controller 40 provided with the variable impedance device 10 for the seismic instrument signal input channel.

[0118] After correctly connecting external electromagnetic simulated seismic geophones of different series-parallel combinations and different DC resistances to the variable impedance device 10 of the seismic instrument signal input channel, ensure that all external electromagnetic simulated seismic geophones connected to the device are well coupled with the ground;

[0119] The connected external electromagnetic simulated seismic geophone is automatically tested through the variable impedance device 10 of the seismic instrument signal input channel. After the test is completed, the geophone (string) with abnormal test value is immediately replaced according to the value of the tested resistance until the test values ​​are normal, and the DC resistance value R of the connected normal geophone (string) is recorded;

[0120] The user can select different DC impedance values ​​through the handheld controller 40 of this device according to test needs. The selectable DC impedance is 20KΩ, 40KΩ, 60KΩ, 80KΩ, 100KΩ, 120KΩ, 140KΩ, 160KΩ, 180KΩ, and 200KΩ. Because the RC network module Z11 is only suitable for piezoelectric geophones and cannot be matched with external electromagnetic analog seismic geophones, the Z11 selection function is disabled when switching to manual mode.

[0121] The user uses the handheld controller 40 provided with the device to turn on the data acquisition switch and collect seismic data. After the collection is completed, the user uses the handheld controller provided with the device to turn off the data acquisition switch.

[0122] Repeat the process of selecting different impedance networks for seismic data acquisition until all connected detectors (strings) of the same type are tested;

[0123] Replace the experimental detector (string) and repeat the above steps until the impedance matching experimental plan set by the user is completed.

[0124] In the above manner, the user manually selects the impedance network of the seismic instrument signal input channel through the handheld 40, and conducts a comparative study test on data acquisition effects under multiple impedance modes using the same acquisition circuit, which can provide strong data support for the impedance usage plan for seismic data acquisition in different construction areas.

[0125] The variable impedance device for the signal input channel of a seismic instrument provided in an embodiment of the present invention, after being connected to the seismic instrument host and the simulated seismic detector, can automatically switch to an impedance network that matches the simulated seismic detector according to the test resistance of the connected simulated seismic detector. This device can adapt the impedance of the seismic exploration instrument signal input channel according to the type of simulated seismic detector used to achieve an optimal impedance matching relationship, thereby achieving an optimal seismic wave pickup effect. This device has strong applicability. By rationally configuring impedance network modules with different impedance networks, the device can be applied to all known electromagnetic simulated seismic detectors and piezoelectric detectors with different series and parallel combinations and different DC resistances.

[0126] Based on the same inventive concept, an embodiment of the present invention further provides a variable impedance seismic instrument, comprising: a seismic instrument host 20 and the variable impedance device 10 for the seismic instrument signal input channel described in the first embodiment.

[0127] Based on the same inventive concept, an embodiment of the present invention further provides a seismic data acquisition method for a variable impedance device for a signal input channel of a seismic instrument, comprising the following steps:

[0128] Connecting the variable impedance device 10 of the seismic instrument signal input channel to the seismic instrument host 20;

[0129] Connecting simulated seismic geophones 30 with different series-parallel combinations and different DC resistances to the variable impedance device 10 of the seismic instrument signal input channel;

[0130] The resistance of any simulated seismic detector 30 to be measured is tested through the variable impedance device 10 of the seismic instrument signal input channel, and an impedance network corresponding to the DC impedance is connected according to the magnitude of the tested resistance and the mapping relationship between the preset test resistance range and the DC impedance;

[0131] Data acquisition is performed on the seismic signal picked up by the simulated seismic geophone through the variable impedance device 10 of the seismic instrument signal input channel.

[0132] The embodiment of the present invention provides a seismic data acquisition method for a variable impedance device for a seismic instrument signal input channel. After connecting a seismic instrument host and a simulated seismic detector through the variable impedance device for the seismic instrument signal input channel, the variable impedance device for the seismic instrument signal input channel automatically switches to an impedance network that matches the simulated seismic detector based on the test resistance of the connected simulated seismic detector. The impedance of the seismic exploration instrument signal input channel is adapted according to the type of simulated seismic detector used to achieve an optimal impedance matching relationship, thereby achieving an optimal seismic wave pickup effect. By rationally configuring impedance network modules with different impedance networks, this method can be applied to all known electromagnetic simulated seismic detectors and piezoelectric detectors with different series and parallel combinations and different DC resistances.

[0133] It should be understood that the specific order or hierarchy of steps in the disclosed processes is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0134] In the foregoing detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that embodiments of the claimed subject matter require more features than are expressly recited in each claim. On the contrary, as reflected in the appended claims, the invention comprises less than all the features of any individual disclosed embodiment. The appended claims are therefore hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0135] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein may be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps described above have been generally described around their functions. Whether such functions are implemented as hardware or software depends on the specific application and the design constraints imposed on the entire system. A skilled person may implement the described functions in an adaptable manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of this disclosure.

[0136] The steps of the methods or algorithms described in conjunction with the embodiments herein may be directly embodied as hardware, software modules executed by a processor, or a combination thereof. The software module may be located in a RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and storage medium may also be present in the user terminal as discrete components.

[0137] For software implementation, the techniques described in this application can be implemented using modules (e.g., procedures, functions, etc.) that perform the functions described in this application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or external to the processor. In the latter case, it is communicatively coupled to the processor via various means, which are well known in the art.

[0138] The foregoing description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purposes of describing the above embodiments, but one of ordinary skill in the art will recognize that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to encompass all such changes, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent the term "comprising" is used in the specification or claims, the term is intended to be encompassed in a manner similar to the term "including," as explained in terms of "including," used as a transitional word in the claims. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or."

Claims

1. A variable impedance device for a seismic instrument signal input channel, used to connect a seismic instrument host and an analog seismic geophone, characterized in that: include: Impedance matching board and data acquisition board; The impedance matching board includes multiple groups of impedance networks with different DC impedances connected in parallel; Each of the impedance networks includes an impedance network module and an impedance electronic switch connected to each other; The data acquisition board is connected to multiple impedance electronic switches and can test the resistance of the connected simulated seismic detector. According to the size of the tested resistance and the mapping relationship between the preset test resistance range and DC impedance, the impedance electronic switch of the impedance network to be connected is determined and controlled to be turned on.

2. The variable impedance device for a seismic instrument signal input channel according to claim 1, characterized in that: Each of the impedance network modules includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, and a third capacitor; The first resistor and the second resistor are connected to form a first branch, and a common end connected to the first resistor and the second resistor is grounded; The first capacitor and the second capacitor are connected to form a second branch, and a common terminal connected to the first capacitor and the second capacitor is grounded; The third capacitor constitutes a third branch; The first branch, the second branch and the third branch are connected in parallel; The third resistor is connected between the first resistor and the first capacitor; The fourth resistor is connected between the second resistor and the second capacitor; The fifth resistor is connected between the first capacitor and the third capacitor; The sixth resistor is connected between the second capacitor and the third capacitor.

3. The variable impedance device for a seismic instrument signal input channel according to claim 2, wherein: The first resistor and the second resistor have the same resistance value; The first capacitor and the second capacitor have the same capacitance.

4. The variable impedance device for a seismic instrument signal input channel according to claim 2, wherein: The impedance matching board also includes a common mode coil; The common mode coil is connected to the signal input ends of the multiple impedance networks.

5. The variable impedance device for a seismic instrument signal input channel according to claim 1, wherein: The data acquisition board includes a main control unit and a test unit; The main control unit is connected to the test unit and the impedance electronic switch of the impedance network; The testing unit is used to test the resistance of the connected simulated seismic detector; The main control unit is used to determine and control the impedance electronic switch of the impedance network to be connected to conduct according to the size of the tested resistance and the mapping relationship between the preset test resistance range and the DC impedance.

6. The variable impedance device for a seismic instrument signal input channel according to claim 5, characterized in that: The data acquisition board also includes a communication module and a mode switching switch; The communication module and the mode switching switch are respectively connected to the main control unit; The communication module is connected to the main control unit and is capable of receiving a switching signal from the connected handheld controller and sending the signal to the main control unit; The main control unit is further configured to control the mode switching switch to switch to the manual mode according to the received switching signal.

7. The variable impedance device for a seismic instrument signal input channel according to claim 6, characterized in that: The communication module is also capable of receiving an impedance selection signal from the connected handheld controller and sending the signal to the main control unit; The main control unit is further configured to control the impedance electronic switch of the impedance network to be connected to conduct according to the received impedance selection signal.

8. The variable impedance device for a seismic instrument signal input channel according to claim 7, characterized in that: The data acquisition board also includes a data acquisition switch and a data storage unit; The communication module is also capable of receiving data acquisition signals from the connected handheld device and sending the data acquisition signals to the main control unit; The main control unit is further used to receive the data acquisition signal and control the data acquisition switch to be turned on.

9. The variable impedance device for a seismic instrument signal input channel according to claim 5, characterized in that: The data acquisition board also includes an analog-to-digital converter; The analog-to-digital converter is connected to the signal output ends of the multiple impedance networks.

10. A variable impedance seismic instrument, characterized in that: include: A seismic instrument host and a variable impedance device for a signal input channel of a seismic instrument as claimed in any one of claims 1 to 9.

11. A seismic data acquisition method for a variable impedance device for a seismic instrument signal input channel, characterized in that: include: Connect the variable impedance device of the seismic instrument signal input channel to the seismic instrument host; Connecting simulated seismic geophones of different series-parallel combinations and different DC resistances to the variable impedance device of the seismic instrument signal input channel; The resistance of any simulated seismic detector to be measured is tested through the variable impedance device of the seismic instrument signal input channel, and an impedance network corresponding to the DC impedance is connected according to the magnitude of the tested resistance and the mapping relationship between the preset test resistance range and the DC impedance; Data acquisition is performed on the seismic signal picked up by the simulated seismic geophone through the variable impedance device of the seismic instrument signal input channel.

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