CN111290013A - Seismic cable detection device and method - Google Patents
Seismic cable detection device and method Download PDFInfo
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- CN111290013A CN111290013A CN202010224262.1A CN202010224262A CN111290013A CN 111290013 A CN111290013 A CN 111290013A CN 202010224262 A CN202010224262 A CN 202010224262A CN 111290013 A CN111290013 A CN 111290013A
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
- G01V1/181—Geophones
- G01V1/184—Multi-component geophones
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Abstract
The invention provides a seismic cable detection device and a method, wherein the device comprises: a host; calibrating a detector; the signal excitation module is communicated with the host and receives an instruction of the host to generate a seismic wave simulation signal; the signal processing module is used for receiving seismic wave analog signals generated by the signal excitation module, converting the seismic wave analog signals into receivable signals of the seismic cable geophone, and respectively transmitting the receivable signals to the calibration geophone and the seismic cable geophone to be detected; the signal acquisition module is communicated with the calibration detector or the seismic cable detector to be detected, receives feedback signals of the calibration detector and the seismic cable detector to be detected and transmits the feedback signals to the host; and the host machine compares the feedback signals of the calibration detector and the seismic cable detector to be detected to generate a detection result. The detection method is to generate a detection result of whether the seismic cable is qualified or not by comparing the calibration detector signal with the seismic cable detector signal to be detected.
Description
Technical Field
The invention relates to the technical field of signal processing and equipment detection, in particular to a seismic cable detection device and method.
Background
Seismic cables are used for seismic wave acquisition and basic processing. Taking the application of the field of marine oil and gas exploration as an example, the marine oil and gas exploration mainly utilizes a seismic source to excite seismic waves, collects acoustic signals of the seismic waves reflected by a seabed stratum through a receiving end, and calculates and maps the collected acoustic data to analyze the seabed stratum condition. Conventional receivers have oil filled cables, solid cables, OBS, etc. The oil-filled cable and the solid cable are collectively called as seismic cables, and the cable is called as a cable before cabling (finished seismic cable), and the oil-filled cable and the solid cable are called as oil-filled cables and solid cables after cabling (finished seismic cable) is finished (oil-filled and glue-filled and cured), and are also called as towing cables. The seismic cable is provided with signal acquisition and processing instruments such as a wave detector, an acquisition circuit and the like. The manufacturing quality and the used state of the seismic wave data directly influence the acquisition quality of the seismic wave data. Therefore, in the field of seismic cable applications, detection of the operational performance of a seismic cable is particularly important.
The main factor affecting the performance of a seismic cable is the performance of the geophones and the signal acquisition circuitry. In the prior art, the performance detection work of the seismic cable is usually completed by a manual detection method. The geophone in the seismic cable is knocked manually, the sound wave signal is collected by the collection system, and the quality of the sound wave signal is judged manually and subjectively, so that whether the geophone and a corresponding collection circuit meet the requirement of normal work or not is obtained.
The detection mode has the factors of large workload, low detection precision and the like, is greatly influenced by human subjective factors and external detection conditions, cannot qualitatively and quantitatively analyze and judge the quality of the detector and the corresponding acquisition circuit thereof, and further cannot systematically and accurately evaluate the state of the seismic cable.
Disclosure of Invention
The invention aims to provide a detection device and a detection method capable of automatically and accurately completing the performance detection of a seismic cable, which can be used for detection before and after the seismic cable is cabled (becomes a finished seismic cable).
In order to achieve the purpose, the invention adopts the technical scheme that:
a seismic cable detection apparatus comprising:
a host computer: a transmission parameter instruction can be set;
calibrating a detector;
the signal excitation module is communicated with the host computer and used for acquiring a transmission parameter instruction of the host computer so as to generate a seismic wave analog electric signal;
the signal processing module is used for receiving seismic wave analog electric signals generated by the signal excitation module, converting the seismic wave analog electric signals into analog acoustic signals which can be received by the seismic cable geophone, and respectively transmitting the analog acoustic signals to the calibration geophone and the seismic cable geophone to be detected;
the signal acquisition module is communicated with the calibration detector or the seismic cable detector to be detected, receives feedback signals of the calibration detector and the seismic cable detector to be detected and transmits the feedback signals to the host;
the host machine receives and stores the feedback signals in sequence according to the channel numbers of the detectors; and the host machine compares the feedback signals of the calibration detector and the seismic cable detector to be detected to generate a detection result.
Preferably, the signal processing module uses a transducer to convert an analog electrical signal generated by the host computer into an analog acoustic signal.
Preferably, the detection device further comprises a power amplification module, which is respectively connected with the output ends of the host and the signal excitation module, and receives an amplification instruction of the host to amplify the seismic wave analog signal.
Preferably, the detection device further comprises a water tank, and a first mounting bracket for mounting the transducer and a second mounting bracket for mounting a geophone section of the seismic cable to be detected or a calibration geophone are arranged in the water tank.
Preferably, the first and second mounting brackets are configured such that the transducer and the section of the cable receiver under test or calibration receiver are mounted at the same height.
Preferably, the inner wall of the water tank is covered with a sound attenuation material.
Preferably, the detection device further comprises a seismic source box, and the host, the signal excitation module and the power amplification module are all installed in the seismic source box.
The invention further provides a seismic cable detection method, which comprises the following steps:
and (3) calibration signal detection: selecting a detector with the same model as a detector in the seismic cable to be detected as a calibration detector, setting parameters through a host to generate a seismic wave analog signal, receiving the seismic wave analog signal by the calibration detector, and collecting a feedback signal of the calibration detector under the set parameters as a calibration signal by the host;
detecting signals of the seismic cable to be detected: replacing a calibration geophone by the geophone section of the seismic cable to be detected, generating seismic wave analog signals by adopting the same set parameters, receiving the seismic wave analog signals by the geophone section of the seismic cable to be detected, and acquiring feedback signals of the geophone of the seismic cable to be detected as seismic cable signals;
generating a detection result: and setting a difference threshold, comparing the seismic cable signal with the calibration signal, if the difference between the seismic cable signal and the calibration signal is within the range of the difference threshold, determining that the seismic cable to be tested is qualified, and if not, determining that the seismic cable to be tested is unqualified.
Preferably, the setting parameter includes a plurality of parameter values;
changing one parameter value in a plurality of parameter values in the calibration signal detection process, and then collecting a feedback signal of the calibration detector to obtain a plurality of groups of calibration signals;
in the process of detecting the seismic cable signals to be detected, the same set parameters are adopted to obtain a plurality of groups of seismic cable signals;
and comparing the calibration signal corresponding to each group with the seismic cable signal, if the difference value of each group is within the threshold range, determining that the seismic cable to be tested is qualified, and otherwise, determining that the seismic cable to be tested is unqualified.
Preferably, for multiple seismic cables, comparing the seismic cable signal of each geophone with the calibration signal, if the difference value of each seismic cable signal and the calibration signal is within the range of the difference threshold value, determining that the seismic cable to be detected is qualified, and if all the seismic cables to be detected are qualified, determining that the seismic cable to be detected is qualified.
The invention has the beneficial effects that:
the seismic cable detection device and the method provided by the invention can be used for evaluating the manufacturing process of each stage of the finished seismic cable (becoming a finished seismic cable), monitoring the production and use states of the manufactured seismic cable, detecting the loss degree of the finished seismic cable after being used for years, and evaluating the usable state and the usable life of the finished seismic cable after being used for years. The device and the method can simulate the use environment of the seismic cable, qualitatively and quantitatively generate a comparison result through a calibration comparison mode, can respectively calibrate and detect a plurality of detectors in the seismic cable, further evaluate the state of the whole seismic cable, have high efficiency and high detection precision, and can guide and improve the cable forming (forming the finished seismic cable) process of the seismic cable and improve the working effect of the seismic cable in the fields of oil-gas exploration and the like.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a logical block diagram of a seismic cable detection apparatus of the present invention;
FIG. 2 is a schematic view of a seismic source box of the seismic cable detection apparatus of the present invention;
FIG. 3 is a schematic diagram of the water tank structure of the seismic cable detection apparatus of the present invention;
FIG. 4 is a flow chart of a seismic cable detection method of the present invention;
1-a host;
2-a signal excitation module;
3-a power amplification module;
4-a seismic source box;
5-a water tank;
6-a first mounting bracket, 601-a transducer mounting slot;
7-a second mounting bracket, 701-a seismic cable/calibration geophone mounting groove;
8-a transducer;
9-seismic cable to be tested.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a seismic cable detection device and a detection method, which can be used for performance test of each stage of seismic cable manufacturing and application, and qualitative and quantitative evaluation of the manufacturing process of the seismic cable, defects in the manufacturing process and loss degree after use.
The invention firstly provides a seismic cable detection device, which is used for detecting a seismic cable to be detected and can communicate with the seismic cable to be detected, and the device comprises:
the system comprises a host 1, wherein the host 1 is loaded with data acquisition and processing software and used for performance analysis of the seismic cable, and a transmission parameter instruction can be issued through the host;
the calibration detector is the same as the detector in the seismic cable to be tested in model, and a signal fed back by the calibration detector is a calibration signal and is used for comparing with a feedback signal of the detector in the seismic cable to be tested in the experiment;
the signal excitation module 2 is communicated with the host, receives the instruction of the host to generate a seismic wave analog signal, can set an emission parameter instruction through the host according to the characteristic of the seismic cable to be detected, and generates an analog electric signal after receiving the emission parameter instruction;
the signal processing module is used for receiving seismic wave analog signals generated by the signal excitation module, converting the seismic wave analog signals into receivable signals of the seismic cable geophone to be detected, and transmitting the receivable signals to the calibration geophone and the seismic cable geophone to be detected respectively; specifically, the signal processing module converts the analog electrical signal into an analog acoustic wave signal that can be received by the detector, and in this embodiment, a transceiver-integrated transducer is adopted;
the signal acquisition module is communicated with the calibration geophone or the seismic cable to be detected, receives feedback signals of the calibration geophone and the seismic cable to be detected and transmits the feedback signals to the host;
and the host 1 compares the feedback signals of the calibration detector and the seismic cable detector to be detected to generate a detection result. Because the whole seismic cable comprises a plurality of detectors, the host machine receives and stores the feedback signals in sequence according to the channel numbers of the detectors.
The calibration detector generates a standard signal, namely a calibration signal, which is used for measuring the detector to be tested to be normal, and the feedback signal of the seismic cable detector is compared with the calibration signal, so that whether the seismic cable to be tested is a product meeting the standard can be judged.
Furthermore, in order to ensure that the seismic wave analog signal generated by the signal excitation module meets the standard of the detection experiment, the detection device further comprises a power amplification module 3, which is respectively connected with the output end of the host and the output end of the signal excitation module 2, and can receive the amplification instruction of the host 1 and amplify the received seismic wave analog signal according to the amplification instruction. The amplification instruction refers to power amplification times (such as 50 times, 100 times, 200 times and the like), and is determined according to experimental requirements and the condition of the seismic cable detector to be tested. The amplified seismic wave analog signal can more effectively excite the reaction of the detector, and the detection experiment can be smoothly carried out.
Further, the installation of the seismic cable detection device is realized through the following structure.
The detection device further comprises a seismic source box 4 and a water tank 5 which are independent from each other.
The host 1, the signal excitation module 2 and the power amplification module 3 are all installed in the seismic source box 4. The seismic source box 4 adopts the size of 450mm 400mm, wherein the output end of the power amplification module 3 is connected to the outer side of the seismic source box body.
The water tank 5 is used for installing the transducer 8 and a calibration geophone or a geophone section of a seismic cable 9 to be detected, and a first installation support 6 used for installing the transducer 8 and a second installation support 7 used for installing the geophone section of the seismic cable 9 to be detected or the calibration geophone are arranged in the water tank 5. In this embodiment, the water tank 5 has a size of 1000mm × 500mm, and during the experiment, the water tank 5 is filled with water to simulate the underwater application environment of the seismic cable.
The output of the power amplification module 3 in the seismic source tank 4 is connected to the transducer 8 in the water tank 5.
When a detection experiment is carried out, the transducer is installed on a first installation support 6, a calibration detector is installed on a second installation support 7, after data acquisition is finished, a seismic cable detector section to be detected is installed on the second installation support 7, preferably, in order to ensure that the detector can smoothly receive signals of the transducer, the first installation support and the second installation support are the same in height, the first installation support 6 comprises a transducer installation groove 601 facing the second installation support 7, the second installation support 7 comprises a seismic cable installation groove perpendicular to the direction of the transducer installation groove, and therefore the first installation support 6 and the second installation support 7 are configured to enable the transducer 8 and the seismic cable 9 section to be detected or the calibration detector to be installed at the same height, and enable the output of the transducer 8 to be aligned with the detector. Referring to fig. 3, in this embodiment, the first mounting bracket 6 is a trapezoid bracket, and a transducer mounting groove 601 facing the second mounting bracket 7 is formed on an upper end surface of the bracket, so that an output end of the transducer faces the geophone of the seismic cable to be detected after the transducer is mounted; the adoption of second installing support 7 is the sub-support that two intervals set up, and two sub-support tip all are provided with the notch, and two notch height are the same, and highly the same with transducer mounting groove 601, guarantee that the seismic cable wave detector that awaits measuring is at same axis and height with the transducer, and guarantee that transducer 8 and the seismic cable wave detector that awaits measuring are at the same height, form seismic cable/mark wave detector mounting groove 701 between two spaced notches, this more is favorable to the stable seismic cable that supports.
Furthermore, the inner wall of the water tank 5 is covered with a noise elimination material to reduce the error of the collected signal caused by the reflection and scattering of the seismic wave analog signal in the water tank 5. The water tank 5 is an open-topped structure, and the sound-deadening material is disposed on the four walls and the bottom inside the water tank 5.
The invention further provides a detection method of the seismic cable. The method can be used for detection and analysis of the seismic cable at each stage, the state of the seismic cable is evaluated, and the detection flow refers to the figure 4.
The detection method of the seismic cable comprises the following steps:
in the embodiment, a concrete detection experiment method is described by taking 48 oil-filled cables as an example, a single-channel cable, a plurality of channels of cables (channel numbers: 48, 96, 120, 240, 480 and the like), a single-channel oil-filled cable, a plurality of channels of oil-filled cables (channel numbers: 48, 96, 120, 240, 480 and the like), a solid cable (channel numbers: 48, 96, 120, 240, 480 and the like), and finished seismic cables used for years can all be analogized by adopting the method to achieve the purpose of detecting the state of the seismic cable, and when the cables are subjected to a detection experiment, all connection parts of the cables need to be subjected to waterproof sealing treatment. The detection process will be performed for each channel of the seismic cable, typically, the seismic cable is provided with a data acquisition module, and a plurality of seismic cable receivers share one data packet, for example, for a 48-channel oil-filled cable, each receiver has a data acquisition port, but each 8 receivers share one data packet, and the receiver feedback data of the 8 channels will be packed and sent to the host.
S1: calibration signal detection
And selecting the same type of detectors as calibration detectors according to the type of the detectors in the seismic cable to be detected.
The transducer is arranged on a first mounting bracket, the calibration detector is arranged on a second mounting bracket, the positions of the transducer and the calibration detector are adjusted, the transducer and the calibration detector are kept in the same central axis and height, and the transducer and the calibration detector are fixed by fixing pieces. And detecting the calibration detector to obtain a calibration signal.
Water is added into the water tank 5 to ensure that the water level covers the transducer and the calibration detector to simulate the underwater application environment.
The set parameters including emission parameters, amplification factor parameters, acquisition parameters and the like are set through the host. The transmission parameters comprise waveform, frequency, amplitude, phase angle and the like of the transmitted waves; the magnification factor parameter refers to the magnification factor of the seismic wave analog signal and the like; the acquisition parameters refer to the sampling period, sampling length, sampling bandwidth, and the like of the data. And collecting a feedback signal of the calibration detector. Specifically, after the host issues the parameters, the signal excitation module generates an analog seismic wave electric signal according to the set parameters, and the power amplification module amplifies the signal according to the amplification factor parameters and transmits the signal to the transducer to convert the signal into an analog seismic wave acoustic signal. After the calibration detector receives the analog seismic wave sound signal, a feedback signal is generated and transmitted to the host computer, and the feedback signal is stored by the host computer.
And changing a certain parameter, such as changing a frequency set value of the transmitted wave, changing the waveform, the signal amplitude, the signal phase angle and the like of the transmitted wave, and continuously collecting a feedback signal of the calibration detector. By changing a single parameter, the sensitivity of the detector to the response of each index can be detected. As the sound wave signals excited by the seismic source used for offshore exploration are all mixed signals, the marine seismic source system is simulated by changing the set parameter signals during detection experiments. Because the signals excited by different operating seismic sources and different excitation energy have certain difference (mainly in main frequency and frequency spectrum); when the same seismic source operates in different sea areas (such as the water depth of 100m, 300m and 600m), because the seabed environments are different, the horizons of some seabed strata are clear, some seabed strata are complex, and the signals of sound wave signals reflected by different types of seabed strata are different, the seismic cable detection experiment under the conditions of different frequencies, different amplitudes and the like is carried out by singly changing parameters during measurement.
In the process, the host machine sets the set parameter values to one group each time, and stores the parameter values and the calibration detector feedback signals according to the groups. Based on this, if the N sets of setting parameters are adopted, the N sets of corresponding calibration signals are obtained.
S2: seismic cable signal detection to be tested
And disassembling the calibration geophone, installing the seismic cable to be tested, enabling the geophone section in the seismic cable to be tested to be positioned at the second installation support, aligning the geophone section with the transducer after installation, and adjusting the seismic cable to be tested to enable the geophone in the seismic cable to be tested to be consistent with the spatial position of the calibration geophone during the experiment. And detecting the seismic cable detector to be detected to obtain a seismic cable signal.
And generating seismic wave simulation sound wave signals by using the same set parameters as those in the step S1, and receiving feedback signals of the seismic cable geophone to be tested.
In the process, the host sets the set parameter values to one group each time, and stores the parameter values and the corresponding feedback signals of the seismic cable detector to be detected according to the group.
And sequentially completing the detection of each channel of the seismic cable to be detected. For the 48-channel oil-filled cable, the geophone in the 1 st channel is used for replacing a calibration geophone, and the position of the geophone is kept unchanged and is positioned on the same central axis and height with the transducer. Referring to the setting parameter values in step S1, the setting parameters are sequentially changed, and feedback data of the 1 st detector is acquired. The detection experiments of the detectors of the 2 nd, 3 rd, … … th to 48 th are sequentially performed.
In the above experimental processes, experiments were carried out by following the single variable method. The signal of each detector is stored separately.
S3: calculation of detection result
And setting a difference threshold, comparing the feedback signal of the seismic cable detector to be tested with the calibration signal, and if the difference of the comparison result is within the range of the set difference threshold, determining that the seismic cable to be tested meets the design or use requirements.
The feedback signal of each detector of the seismic cable to be tested needs to be compared with the calibration signal of the calibration detector in sequence. Specifically, the feedback signals of each detector of the seismic cable to be detected in the state of each set of set parameters are respectively compared with the calibration signals of the corresponding calibration detectors under the same set parameters. And if the signal difference value of the channel is within the threshold range, determining that the channel of the seismic cable to be tested meets the design or use requirements. And for the plurality of seismic cables, if each channel of the seismic cable to be detected is qualified, the seismic cable to be detected is qualified.
The specific determination method comprises the following steps: and comparing the calibration signal of the calibration wave detector which is tested under the same set parameters with the test signal of each tested wave detector in the 48 oil-filled cables, wherein the calibration signal is compared with the test signal of each tested wave detector in the 48 oil-filled cables in terms of wave form, jump point of wave form, amplitude of signal, frequency of signal, phase angle of signal and other parameters, and analyzing the manufacturing process of each wave detector in the seismic cable and the corresponding acquisition circuit thereof so as to systematically evaluate the state of the whole 48 oil-filled cables.
Take the comparison of the trip point parameters of the waveforms as an example. The method comprises the following steps that the takeoff point of a calibration wave detector waveform needs to be consistent with the takeoff point of a first seismic cable wave detector waveform, specifically: and (3) the jump point of the received waveform of the calibration wave detector jumps at 300us, the jump point of the received waveform of the first cable wave detector needs to be within 290-310 us (within a threshold range), and if the jump point of the received waveform of the first cable wave detector is within 600us and exceeds the threshold range, the first cable wave detector is judged to be unqualified. And comparing the frequency spectrums by taking a frequency spectrum comparison example, wherein the frequency spectrum distribution graph is consistent, if the main frequency of the frequency spectrum of the signal received by the calibration detector is 450Hz, the main frequency of the frequency spectrum of the signal received by the first seismic cable detector needs to be within the range of 449Hz to 451Hz, and if the main frequency is not within the range of 449Hz to 451Hz, the frequency spectrum distribution graph is unqualified.
And evaluating the health state of the seismic cable to be detected according to the detection result of each wave detector of the seismic cable to be detected. For products with bad health status, the products belong to products which do not meet the standard, and can not leave the factory or be used continuously.
The seismic cable to be detected adopted by the detection method provided by the invention can be a cable before cabling (becoming a finished seismic cable), an oil-filled cable after cabling (becoming a finished seismic cable) (after oil filling and glue filling curing), a solid cable and a finished seismic cable used for years, and the detection steps are the same as the method.
The method adopts a qualitative and quantitative evaluation mode to analyze the performance of each stage of the seismic cable cabling (finished seismic cable), analyzes the manufacturing process of the seismic cable based on the evaluation result, guides the improvement of the defects in the manufacturing process of the seismic cable, and improves the manufacturing process level of the seismic cable; meanwhile, the using state of the seismic cable in use can be evaluated in an auxiliary mode, the loss degree of the seismic cable geophone used for many years and the loss degree of the corresponding acquisition circuit of the seismic cable geophone are distinguished, whether the requirement of continuous operation is met or not is judged, the service life of the seismic cable geophone is evaluated, and the seismic cable is guided to be replaced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A seismic cable detection apparatus, comprising:
a host computer: a transmission parameter instruction can be set;
calibrating a detector;
the signal excitation module is communicated with the host computer and used for acquiring a transmission parameter instruction of the host computer so as to generate a seismic wave analog electric signal;
the signal processing module is used for receiving seismic wave analog electric signals generated by the signal excitation module, converting the seismic wave analog electric signals into analog acoustic signals which can be received by the seismic cable geophone, and respectively transmitting the analog acoustic signals to the calibration geophone and the seismic cable geophone to be detected;
the signal acquisition module is communicated with the calibration detector or the seismic cable detector to be detected, receives feedback signals of the calibration detector and the seismic cable detector to be detected and transmits the feedback signals to the host;
the host machine receives and stores the feedback signals in sequence according to the channel numbers of the detectors; and the host machine compares the feedback signals of the calibration detector and the seismic cable detector to be detected to generate a detection result.
2. The seismic cable detection apparatus of claim 1, wherein the signal processing module employs a transducer to convert an analog electrical signal generated by the host computer into an analog acoustic signal.
3. The seismic cable detection apparatus of claim 2, further comprising a power amplification module connected to the output of the host and the signal excitation module, respectively, for receiving an amplification command from the host to amplify the seismic wave analog signal.
4. A seismic cable testing apparatus according to claim 2, wherein the testing apparatus further comprises a water tank, and a first mounting bracket for mounting the transducer and a second mounting bracket for mounting a seismic cable geophone section under test or a calibration geophone are provided in the water tank.
5. The cable sensing apparatus of claim 4, wherein the first mounting bracket and the second mounting bracket are configured to mount the transducer and the cable geophone section under test or calibration geophone at the same elevation.
6. The seismic cable detection apparatus of claim 4, wherein the tank inner wall is covered with a sound damping material.
7. The seismic cable detection apparatus of claim 3, wherein the detection apparatus further comprises a seismic source box, and the host, the signal excitation module, and the power amplification module are all mounted within the seismic source box.
8. A seismic cable detection method using the seismic cable detection apparatus according to any one of claims 1 to 7, comprising:
and (3) calibration signal detection: selecting a detector with the same model as a detector in the seismic cable to be detected as a calibration detector, setting parameters through a host computer, generating a seismic wave analog signal, and collecting a feedback signal of the calibration detector under the set parameters as a calibration signal;
detecting signals of the seismic cable to be detected: replacing a calibration geophone by the geophone section of the seismic cable to be detected, generating seismic wave analog signals by adopting the same set parameters, and acquiring feedback signals of the geophone section of the seismic cable to be detected as seismic cable signals;
generating a detection result: and setting a difference threshold, comparing the seismic cable signal with the calibration signal, if the difference between the seismic cable signal and the calibration signal is within the range of the difference threshold, determining that the seismic cable to be tested is qualified, and if not, determining that the seismic cable to be tested is unqualified.
9. A seismic cable detection method as claimed in claim 8, wherein: the setting parameters comprise a plurality of parameter values;
changing one parameter value in a plurality of parameter values in the calibration signal detection process, and then collecting a feedback signal of the calibration detector to obtain a plurality of groups of calibration signals;
in the process of detecting the seismic cable signals to be detected, the same set parameters are adopted to obtain a plurality of groups of seismic cable signals;
and comparing the calibration signal corresponding to each group with the seismic cable signal, if the difference value of each group is within the threshold range, determining that the seismic cable to be tested is qualified, and otherwise, determining that the seismic cable to be tested is unqualified.
10. A seismic cable detection method as claimed in claim 8 or 9, wherein for a plurality of seismic cables, the seismic cable signal of each geophone is compared with a calibration signal, and if the difference between a certain seismic cable signal and the calibration signal is within a difference threshold range, the seismic cable to be detected is qualified, and if all the seismic cables to be detected are qualified, the seismic cable to be detected is qualified.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111751907A (en) * | 2020-06-29 | 2020-10-09 | 中国石油天然气集团有限公司 | Detection method and system for acoustic logging instrument transmitting acoustic system probe |
| CN113917289A (en) * | 2021-12-14 | 2022-01-11 | 中海油田服务股份有限公司 | Solid cable testing device and method |
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