Method for detecting gradient of node seismic instrument detector based on modeling mode

Abstract

The invention belongs to the technical field of seismic exploration equipment detection, and particularly discloses a node seismic instrument geophone gradient detection method based on a modeling mode, which comprises the following steps: selecting a plurality of node acquisition stations and geophones as a group of modeling samples, sending a modeling instruction through a matched handbook, receiving the modeling instruction by the node acquisition stations, and sending the modeling instruction to the geophones; when the detector is connected, excitation electric signals are output to the connected detector, response result data are recorded and transmitted back to a matched handbook, the average value of response results is calculated, and a standard model is established. When the gradient of a geophone or a geophone string is tested, each test result is compared with the model, so that the purpose of testing the embedding gradient of the geophone or the geophone string is achieved. The method is used for detecting the gradient of the node seismic instrument detector.

Description

Technical Field

[0001] The invention belongs to the technical field of seismic exploration equipment detection, and relates to the detection of node seismic instrument geophones, and specifically is a node seismic instrument geophone inclination detection method based on modeling. Background Art

[0002] In seismic exploration, the different buried inclinations of the geophones of the same node seismic instrument will seriously affect the ability of the geophones to pick up effective seismic waves, and thus affect the accuracy and reliability of seismic exploration data.

[0003] At present, most of the commonly used node seismic detection instruments such as GSR, SmartSolo, HardVox, eSeis, iNod, Hawk and Quantum do not have the function of detecting the buried inclination of the detector. Although a few node seismic instruments have such a function, they are only for specific models of built-in detectors that are standard at the factory and have known detector performance indicators. Once the model or combination of seismic detectors used with them is replaced, the detection result of the buried inclination becomes unreliable.

[0004] In addition to the above-mentioned built-in geophones, external geophones are also widely used. Since external geophones can choose different combinations of single geophone cores or multiple geophone cores, the series and parallel connection methods between multiple geophone cores are also complex and changeable. At the same time, different work areas may also connect and use external geophones of different manufacturers and models. When the number of cores, series and parallel connection methods, manufacturers or models are different, the response of the external geophone to the same excitation signal will be different, which makes it more difficult to accurately detect the inclination of the seismic geophone.

[0005] To address the above phenomenon, we currently still rely on changing the hardware structure of the detector or adjusting the construction mode in advance by connecting different work areas in the early stage of construction work, and formulating a construction plan that meets the performance of the selected detector to minimize the burial inclination. However, this type of method cannot accurately detect the inclination, and there is also the problem of increasing construction costs and affecting efficiency. Summary of the invention

[0006] The purpose of the present invention is to provide a method for detecting the inclination of a node seismic instrument geophone based on a modeling approach. Without changing the existing hardware structure and construction mode of the node seismic instrument, without increasing the construction cost, and without affecting the construction efficiency, by optimizing the on-site production organization links during the polarity knocking test before construction, based on the modeling approach, the detection of the buried inclination of the seismic detector or seismic detector string connected to the node seismic instrument acquisition station during the production process is realized.

[0007] To achieve the above object, the present invention provides a method for detecting the inclination of a node seismic instrument geophone based on a modeling method, the method comprising the following steps performed in sequence:

[0008] S1. Select modeling nodes

[0009] Selecting geophones of the same model and burial state, with no less than 20 node acquisition stations arranged according to the seismic construction arrangement parameters as a set of modeling samples;

[0010] Among them, the detectors of the external node collection station should be placed according to normal construction parameters.

[0011] Step S1 can be performed during the polarity knocking test, or when the ambient temperature changes by more than 15° C. during the construction process and when the detector tilt detection is required.

[0012] S2. Send instructions during polarity tapping test

[0013] Use the matching handbook to send modeling instructions to the node collection stations in the same group of detectors that are buried in a compliant manner and can be connected to the wireless network;

[0014] The node acquisition stations are all configured with the same sampling interval and preamplifier gain according to the earthquake construction arrangement parameters;

[0015] S3. Command transmission

[0016] After receiving the modeling instruction, the node acquisition station outputs an excitation electrical signal with known technical characteristics to the connected detector, records the response result data of the detector to the excitation electrical signal, and transmits the response result data back to the matching handheld controller;

[0017] The excitation electrical signal known in the technical features includes an electrical signal with stable amplitude and test duration;

[0018] S4. Establishing a standard model

[0019] Calculate the average value of the response result data according to the response result data of no less than 20 node acquisition stations in the same group received by the matching notebook, and save the average value in the matching notebook as a standard model for detecting the inclination of the node seismic instrument geophone;

[0020] S5. Tilt detection

[0021] By using the node instrument detector inclination test software function of the matching handbook, the measured data of the node seismic instrument detector inclination detection is compared with the standard model to obtain the inclination of the connected node seismic instrument detector.

[0022] S6. Repeated modeling

[0023] If the same acquisition project involves detectors of different models, different manufacturers, and different series-parallel combinations, the above modeling process needs to be repeated. Before testing the detector burial inclination each time, the corresponding detector response characteristic model should be selected on the matching notebook.

[0024] As a limitation, the node geophone is a single geophone or a string of geophones.

[0025] As another limitation, the inclination is expressed as a percentage, and the value of the inclination is positively correlated with the degree to which the node seismic instrument detector deviates from the vertical direction of gravity. That is, the less the node seismic instrument detector deviates from the vertical direction of gravity, the smaller the inclination.

[0026] Due to the adoption of the above scheme, the present invention has the following beneficial effects compared with the prior art:

[0027] The present invention utilizes a modeling method to perform dynamic modeling according to work area conditions, node types, node seismic instrument geophone types, node seismic instrument geophone series-parallel modes, and node seismic instrument geophone layout diagrams, thereby ensuring that the inclination detection results are effective and reliable.

[0028] The invention is applicable to both built-in and external geophones, and is applicable to the detection of the inclination of geophones of node seismic instruments of different models, different manufacturers and different series-parallel combination modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Figure 1 Schematic diagram of arrangement and layout of node seismic instrument geophones in an embodiment of the present invention, wherein 1a, 1b, 1c...1n represent node instruments produced by different manufacturers, 2a, 2b, 2c...2n represent node seismic instrument geophones of different types and different series-parallel combinations, and 3a, 3b represent matching handbooks;

[0031] Figure 2 A flow chart of establishing a standard model in an embodiment of the present invention;

[0032] Figure 3 Schematic diagram of the excitation signal and response result data in formula (1) in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with embodiments, but those skilled in the art should understand that the present invention is not limited to the following embodiments, and any improvements and equivalent changes made based on the specific embodiments of the present invention are within the scope of protection of the claims of the present invention.

[0034] Embodiment Node seismic instrument geophone tilt detection method based on modeling

[0035] This embodiment is a method for detecting the inclination of node seismic instrument geophones based on modeling. Figure 1 The inclination of the seismic detector string in the work area shown is detected.

[0036] like Figure 1 As shown, the node acquisition station 1a is connected to the seismic detector 1b to collect seismic waves, and the matching handbook 3a exchanges information with the node acquisition station 1a through a wireless transmission medium to query the working parameters and status data of the node acquisition station, and can also send control commands to the node acquisition station. Among them, the matching handbook can simultaneously exchange information with multiple node acquisition stations that are accessible by wireless transmission signals. Therefore, the node acquisition stations 2a, 2b or 2n may simultaneously exchange information with the matching handbooks 3a or 3b. Since node seismic instrument detectors of different models, different manufacturers, and different series-parallel combinations have different response results to the same excitation signal, it is necessary to accurately detect the buried inclination. Figure 2 The method is used to establish the standard model of the response of seismic instrument detectors at different nodes to the same excitation signal, as follows:

[0037] 1. Establishment of the Standard Model

[0038] S1. Select modeling nodes

[0039] During the polarity tapping test phase of the seismic instrument system at the beginning of the project, geophones of the same model and burial status were selected, with no less than 20 node acquisition stations arranged according to the seismic construction arrangement parameters as a set of modeling samples;

[0040] S2. Send instructions during polarity tapping test

[0041] Use the matching handbook to send modeling instructions to the node acquisition stations in the same group whose seismic instrument geophones are buried in a compliant manner and can be connected to the wireless network;

[0042] Among them, all node acquisition stations are arranged according to the seismic construction parameters and are configured with the same sampling interval and preamplifier gain;

[0043] Among them, compliance with the detector embedding method refers to achieving what is known in the art as "flat, stable, straight, straight and tight".

[0044] S3. Command transmission

[0045] After receiving the modeling instruction, the node acquisition station outputs an excitation electrical signal with known technical characteristics to the connected node seismic instrument detector, then starts the acquisition, records the response result data of the node seismic instrument detector to the excitation electrical signal, and transmits the response result data back to the matching handbook;

[0046] Among them, the excitation electrical signal with known technical characteristics includes an electrical signal with stable amplitude and test duration.

[0047] The excitation electrical signal is a short DC pulse signal with an amplitude of 10% of the full scale when the preamplifier gain of the node acquisition station is 0dB and a duration of 15ms. When the node acquisition station records the response result data to the excitation signal, the sampling interval and preamplifier gain used are the same as the construction parameters, and the recording length is 5 seconds. The smaller the sampling interval and preamplifier gain used, the better the test results will be.

[0048] S4. Establishing a standard model

[0049] According to the response result data of no less than 20 node acquisition stations in the same group received by the matching notebook, the response result data recorded by each node acquisition station are analyzed and the average value of the response result data is calculated. The average value is saved in the matching notebook and used as a standard model for the tilt detection of the node seismic instrument detector;

[0050] The specific method is:

[0051] First, the sample point related information directly collected from the node collection station is transmitted to the supporting handbook through the response result data.

[0052] Secondly, from the end time t1 of the excitation signal to the end time t2 of the acquisition, the absolute value and amplitude of all the sample points between t1 and t2 (including t1 and t2) are calculated, and the formula (1) is used as follows: Figure 3 As shown;

[0053]

[0054] Where:

[0055] S——test response result of a single channel;

[0056] X i ——the amplitude of the i-th sample point;

[0057] N——The number of sample points between t1 and t2 (including t1 and t2);

[0058] Using the response results recorded by multiple node acquisition stations in the same group, the multiple absolute values ​​and are calculated respectively, and then the average value is calculated using formula (2) as the standard model for node seismic instrument geophone inclination detection; the standard model is stored in the matching notebook;

[0059]

[0060] Where, Mode is the test response result of a given detector group;

[0061] S i ——The response result of the i-th channel in a given detector group;

[0062] n is the number of channels in a given detector group;

[0063] (II) Tilt detection

[0064] Using the node slope test software NodeT app provided with the notebook, the measured data of the inclination detection of the seismic instrument detector at each node are compared with the standard model. The absolute value of the difference obtained by comparison is divided by the standard model and expressed as a percentage. This percentage is the buried inclination of the detector. The numerical value of the inclination is positively correlated with the degree to which the node seismic instrument detector deviates from the vertical direction of gravity.

[0065] After calculation, in this embodiment, the measured data of the node seismic instrument geophone inclination detection is 19580.17891, while in the standard model, this data is 19690.54603. After comparison, the comparison result is 0.6%. The above results show that the node seismic instrument geophone inclination detection method based on modeling mode of the present invention can effectively detect the node seismic instrument geophone inclination.

[0066] In addition, during the daily inspection process, the node collection station automatically performs the corresponding test of the detector burial inclination and saves the test results.

[0067] During manual inspections by construction personnel or automatic inspections by drones, once a wireless communication connection is established between the supporting handbook and the node collection station, the node collection station automatically transmits the daily inspection test results back, and the handbook automatically saves and displays the daily inspection results including the detector buried inclination test.

[0068] (III) Repeated Modeling

[0069] When the same acquisition project contains detectors of different models, different manufacturers, and different series-parallel combinations, the above modeling process shall be executed separately. Before testing a single seismic detector or the burial inclination of a seismic detector string each time, the corresponding detector response characteristic model shall be selected on the supporting notebook.

[0070] In addition, during the implementation of the present invention, after the matching handbook calculates the standard model of the detector, the standard model can also be transmitted back to the node acquisition station. During each test, a comparison is made in the node acquisition station, and the burial inclination is calculated and transmitted to the matching handbook. This also belongs to the technical content of the embodiments of the present invention.

[0071] It should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A method for detecting the inclination of a node seismic instrument geophone based on modeling. It is characterized in that The method comprises the following steps performed in sequence: S1. Select modeling nodes Selecting geophones of the same model and burial state, with no less than 20 node acquisition stations arranged according to the seismic construction arrangement parameters as a set of modeling samples; S2. Send command during polarity tap test Use the matching handbook to send modeling instructions to the node collection stations in the same group of instruments whose detectors are buried in a compliant manner and can be connected to the wireless network; The node acquisition stations are all configured with the same sampling interval and preamplifier gain according to the earthquake construction arrangement parameters; S3. Command transmission After receiving the modeling instruction, the node acquisition station outputs an excitation electrical signal with known technical characteristics to the connected node seismic instrument detector, records the response result data of the node seismic instrument detector to the excitation electrical signal, and transmits the response result data back to the matching handbook; The excitation electrical signal known in the technical features includes an electrical signal with stable amplitude and test duration; S4. Building a Standard Model Calculate the average value of the response result data according to the response result data of no less than 20 node acquisition stations in the same group received by the matching notebook, and save the average value in the matching notebook as a standard model for detecting the inclination of the node seismic instrument geophone; S5. Tilt detection Using the node instrument geophone inclination test software function of the matching handbook, the measured data of the node seismic instrument geophone inclination detection is compared with the standard model to obtain the inclination of the connected node seismic instrument geophone; S6. Repeated modeling If the same acquisition project involves detectors of different models, different manufacturers, and different series-parallel combinations, the above modeling process needs to be repeated. Before testing the detector burial inclination each time, the corresponding detector response characteristic model should be selected on the matching notebook.

2. The method for detecting the inclination of a node seismic instrument geophone based on modeling according to claim 1, It is characterized in that The node seismic instrument geophone is a single seismic geophone or a seismic geophone string.

3. The node seismic instrument geophone inclination detection method based on modeling according to claim 1 or 2, It is characterized in that The inclination is expressed as a percentage, and the numerical value of the inclination is positively correlated with the degree to which the node seismic instrument detector deviates from the vertical direction of gravity.

Images