Lithologic density logging result calibration method based on multi-probe high-pressure control algorithm

Abstract

The invention relates to the field of geophysics, and discloses a lithologic density logging result calibration method and device based on a multi-probe high-pressure control algorithm, electronic equipment and a storage medium, the method comprises the following steps: inquiring standard temperature and standard high pressure in a detector, constructing a temperature high-pressure curve, calculating a high-pressure average value, determining a high-voltage control curve of the detector; measuring the actual temperature, determining a high-voltage control signal, and collecting a nuclear pulse signal; measuring an actual temperature, determining a high-voltage control signal, and collecting a nuclear pulse signal of the detector; performing amplification filtering processing on the nuclear pulse signal, performing variable gain amplification on the amplified and filtered signal, and performing multi-channel equal division processing on the variable gain signal; and extracting a signal reference source, identifying a signal full-energy peak of the signal reference source, querying a signal position corresponding to the signal full-energy peak, and carrying out signal calibration on the plurality of equally divided signals to obtain a lithologic density logging calibration result. According to the method, the accuracy of the lithologic density logging result can be improved.

Description

Technical Field

[0001] The present invention relates to the field of geophysics, and particularly to a calibration method, device, electronic device and storage medium for litho-density logging results based on a multi-probe high-voltage control algorithm. Background Art

[0002] Calibration of litho-density logging results based on a multi-probe high-voltage control algorithm refers to using a high-voltage module to provide high voltage for multiple (two or three) detectors of litho-density, collecting the received signals of the detectors with a full-spectrum pulse acquisition circuit board, calibrating the precise positions of the energy segments for measuring density and lithology in the full spectrum according to the collected full-spectrum data, and then counting the pulse counts for measuring density and lithology at these positions.

[0003] Currently, when a litho-density logging instrument is performing logging operations, it is necessary to dynamically adjust the high voltage of each detector to ensure that each detector measures effective radioactive pulse counts, and these counts will be used for calculating formation density and lithology. However, for small-diameter litho-density logging instruments and logging-while-drilling litho-density logging instruments, considering power consumption and mechanical dimensions, configuring different high-voltage modules for each detector requires more components for litho-density logging instruments, and due to the different high-voltage magnitudes of the high-voltage modules, the logging data obtained by the detectors is deviated. Therefore, the accuracy rate of litho-density logging results is insufficient. Summary of the Invention

[0004] To solve the above problems, the present invention provides a calibration method, device, electronic device and storage medium for litho-density logging results based on a multi-probe high-voltage control algorithm, which can reduce the components required for litho-density logging instruments, optimize litho-density logging instruments, and improve the measurement accuracy of litho-density logging instruments.

[0005] In a first aspect, the present invention provides a calibration method for litho-density logging results based on a multi-probe high-voltage control algorithm, including:

[0006] Query the standard temperature and standard high voltage in the detectors of the litho-density logging instrument, construct a temperature-high voltage curve between the standard temperature and the standard high voltage, calculate the high-voltage average value of the temperature-high voltage curve, and determine the high-voltage control curve of the detector according to the high-voltage average value;

[0007] Measure the actual temperature of the detector, determine the high-voltage control signal of the detector by using the high-voltage control curve and the actual temperature, and collect the nuclear pulse signal of the detector according to the high-voltage control signal;

[0008] Amplify and filter the nuclear pulse signal to obtain an amplified and filtered signal, perform variable gain amplification on the amplified and filtered signal to obtain a variable gain signal, and perform multi-channel equal division processing on the variable gain signal to obtain a multi-channel equal division signal;

[0009] Extract the signal reference source corresponding to the litho-density logging tool, identify the signal full-energy peak of the signal reference source, query the signal position corresponding to the signal full-energy peak in the multi-channel equal division signal, and use the signal position to calibrate the multi-channel equal division signal to obtain the litho-density logging calibration result of the litho-density logging tool.

[0010] In a possible implementation manner of the first aspect, constructing the temperature-high pressure curve between the standard temperature and the standard high pressure includes:

[0011] Construct a rectangular coordinate system between the standard temperature and the standard high pressure;

[0012] Query the target high pressure corresponding to the standard temperature in the standard high pressure;

[0013] Construct a temperature-high pressure point of the target high pressure in the rectangular coordinate system;

[0014] Connect the temperature-high pressure points by a curve to obtain the temperature-high pressure curve.

[0015] In a possible implementation manner of the first aspect, calculating the high pressure average value of the temperature-high pressure curve includes:

[0016] Obtain multiple detector curves in the temperature-high pressure curve, and query the same temperature of the multiple detector curves;

[0017] Extract multiple detector high pressures corresponding to the same temperature;

[0018] Calculate the high pressure average value between the multiple detector high pressures using the following formula:

[0019]

[0020] Where, represents the high pressure average value, J represents the number of detectors corresponding to the temperature-high pressure curve, represents the detector high pressure corresponding to the standard temperature i in the jth temperature-high pressure curve.

[0021] In a possible implementation manner of the first aspect, collecting the nuclear pulse signal of the detector according to the high pressure control signal includes:

[0022] According to the high pressure control signal, receive the optical pulse signal of the radioactive source corresponding to the detector;

[0023] Perform signal optoelectronic conversion on the optical pulse signal using the photocathode in the detector to obtain a photoelectron signal;

[0024] Use the photoanode corresponding to the photocathode to multiply the photoelectron signal step by step to obtain the nuclear pulse signal.

[0025] In a possible implementation manner of the first aspect, the multi-channel equal division processing of the variable gain signal to obtain a multi-channel equal division signal includes:

[0026] Identify the signal length of the variable gain signal;

[0027] According to the signal length, calculate the equal division length of the variable gain signal using the following formula;

[0028]

[0029] Wherein, l represents the equal division length of the variable gain signal, L represents the signal length, and 512 represents the number of channels divided;

[0030] According to the equal division length, perform multi-channel equal division processing on the variable gain signal to obtain a multi-channel equal division signal.

[0031] In a possible implementation manner of the first aspect, the identification of the signal full energy peak of the signal reference source includes:

[0032] Perform analog-to-digital conversion on the signal reference source to obtain a digital signal;

[0033] Query the number of pulses corresponding to the digital signal;

[0034] Construct an energy spectrum diagram between the digital signal and the number of pulses;

[0035] Identify the signal full energy peak of the signal reference source in the energy spectrum diagram.

[0036] In a possible implementation manner of the first aspect, the use of the signal position to calibrate the multi-channel equal division signal to obtain the lithology density logging calibration result of the lithology density logging instrument includes:

[0037] Obtain the signal full energy peak corresponding to the signal position and determine the standard energy spectrum diagram of the signal full energy peak;

[0038] Query the standard coordinates corresponding to the signal full energy peak in the standard energy spectrum diagram;

[0039] Extract the standard peak corresponding to the standard coordinates and the position peak corresponding to the signal position;

[0040] Calculate the position difference between the standard peak and the position peak;

[0041] According to the position difference, perform position translation on the multi-channel equally divided signal to obtain a translated signal, and use the translated signal as the lithology density logging calibration result of the lithology density logging instrument.

[0042] In a second aspect, the present invention provides a lithology density logging result calibration device based on a multi-probe high-voltage control algorithm, and the device includes:

[0043] A control curve determination module, configured to query the standard temperature and standard high voltage in the detector of the lithology density logging instrument, construct a temperature-high voltage curve between the standard temperature and the standard high voltage, calculate the high voltage average value of the temperature-high voltage curve, and determine the high voltage control curve of the detector according to the high voltage average value;

[0044] A pulse signal acquisition module, configured to measure the actual temperature of the detector, determine the high voltage control signal of the detector by using the high voltage control curve and the actual temperature, and acquire the nuclear pulse signal of the detector according to the high voltage control signal;

[0045] A signal multi-channel equal division module, configured to perform amplification and filtering processing on the nuclear pulse signal to obtain an amplified and filtered signal, perform variable gain amplification on the amplified and filtered signal to obtain a variable gain signal, and perform multi-channel equal division processing on the variable gain signal to obtain a multi-channel equally divided signal;

[0046] A calibration result determination module, configured to extract the signal reference source corresponding to the lithology density logging instrument, identify the signal full energy peak of the signal reference source, query the signal position corresponding to the signal full energy peak in the multi-channel equally divided signal, and perform signal calibration on the multi-channel equally divided signal by using the signal position to obtain the lithology density logging calibration result of the lithology density logging instrument.

[0047] In a third aspect, the present invention provides an electronic device, including:

[0048] At least one processor; and a memory communicatively connected to the at least one processor;

[0049] Wherein, the memory stores a computer program executable by the at least one processor, so that the at least one processor can execute the lithology density logging result calibration method according to any one of the above first aspects.

[0050] Fourthly, the present invention provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, it implements the calibration method for lithology density logging results based on the multi-probe high-voltage control algorithm as described in any one of the above first aspects.

[0051] Compared with the prior art, the technical principle and beneficial effect of this solution are as follows:

[0052] In the embodiments of the present invention, first, the standard temperature and standard high pressure in the detector of the litho-density logging tool are queried to determine the relationship between temperature and high pressure according to the changes in temperature and high pressure, ensuring subsequent indirect control of high pressure using temperature. Further, in the embodiments of the present invention, a temperature-high pressure curve between the standard temperature and the standard high pressure is constructed to determine the functional relationship between temperature and high pressure. Further, in the embodiments of the present invention, the average high pressure of the temperature-high pressure curve is calculated to convert the ideal temperature-high pressure curve into an actual high pressure curve that can be used in actual scenarios. Further, in the embodiments of the present invention, according to the average high pressure, the high pressure control curve of the detector is determined to determine a unified temperature-high pressure curve during litho-density logging, reducing the cost of configuring different high pressure modules for each detector and reducing the components required for the litho-density logging tool, optimizing the litho-density logging tool and it can also be used for other radioactive measurement devices. In the embodiments of the present invention, the actual temperature of the detector is measured to determine the actual high pressure corresponding to the actual temperature using the high pressure control curve, realizing the control of the high pressure module of the detector using temperature. Further, in the embodiments of the present invention, the high pressure control signal of the detector is determined using the high pressure control curve and the actual temperature to determine the supply voltage of the detector using the calculated high pressure control curve. Further, in the embodiments of the present invention, according to the high pressure control signal, the nuclear pulse signal of the detector is collected to collect the gamma rays emitted by the radioactive source received by the detector, determining the magnitude of the gamma rays after attenuation after being emitted from the radioactive source and passing through the rock formation. In the embodiments of the present invention, the nuclear pulse signal is amplified and filtered to eliminate out-of-band noise using filtering and amplify the in-band signal for subsequent ADC sampling processing using amplification. Further, in the embodiments of the present invention, the amplified and filtered signal is variably amplified to automatically adjust the amplification factor of the processed signal using a programmable gain amplifier according to requirements to meet the requirements of subsequent circuits and systems. Further, in the embodiments of the present invention, the variably amplified signal is processed by multi-channel equal division to adapt to 512 channel numbers, dividing the signal into 512 channels and then entering multiple channels respectively. In the embodiments of the present invention, the signal reference source corresponding to the litho-density logging tool is extracted to introduce a stable peak high-energy gamma ray source and adopt stable spectrum measures to solve the problem that the output pulse amplitude of the detector changes with the ambient temperature and the high pressure on the photomultiplier tube. Further, in the embodiments of the present invention, the signal full energy peak of the signal reference source is identified to use the signal full energy peak for subsequent stable peak measures to solve the problem that the output pulse amplitude of the detector changes with the ambient temperature and the high pressure on the photomultiplier tube, improving the accuracy of the detector detection result. Further,In the embodiment of the present invention, the signal position corresponding to the signal full energy peak is queried in the multi-channel equal division signals for correcting the deviated position and improving the accuracy rate of logging data. Therefore, a lithology density logging result calibration method, device, electronic device and storage medium based on a multi-probe high-voltage control algorithm proposed by the embodiment of the present invention can improve the accuracy of lithology density logging results. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0055] Figure 1 It is a schematic flowchart of a lithology density logging result calibration method based on a multi-probe high-voltage control algorithm provided by an embodiment of the present invention;

[0056] Figure 2 In an embodiment of the present invention Figure 1 It is a schematic flowchart of one of the steps of a lithology density logging result calibration method based on a multi-probe high-voltage control algorithm provided;

[0057] Figure 3 In an embodiment of the present invention Figure 1 It is a schematic flowchart of another step of a lithology density logging result calibration method based on a multi-probe high-voltage control algorithm provided;

[0058] Figure 4 It is a schematic module diagram of a lithology density logging result calibration device based on a multi-probe high-voltage control algorithm provided by an embodiment of the present invention;

[0059] Figure 5 It is a schematic internal structure diagram of an electronic device for implementing a lithology density logging result calibration method based on a multi-probe high-voltage control algorithm provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0060] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0061] An embodiment of the present invention provides a calibration method for lithology density logging results based on a multi-probe high-voltage control algorithm. The execution subject of the calibration method for lithology density logging results based on the multi-probe high-voltage control algorithm includes, but is not limited to, at least one of electronic devices such as a server, a terminal, etc. that can be configured to execute the method provided by the embodiment of the present invention. In other words, the calibration method for lithology density logging results based on the multi-probe high-voltage control algorithm can be executed by software or hardware installed on a terminal device or a server device, and the software can be a blockchain platform. The server includes, but is not limited to: a single server, a server cluster, a cloud server, or a cloud server cluster, etc. The server can be an independent server or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, Content Delivery Network (CDN), and big data and artificial intelligence platforms.

[0062] Refer to Figure 1 As shown, it is a schematic flowchart of a calibration method for lithology density logging results based on a multi-probe high-voltage control algorithm provided by an embodiment of the present invention. Among them, Figure 1 The calibration method for lithology density logging results described in

[0063] S1. Query the standard temperature and standard high voltage in the detector of the lithology density logging instrument, construct a temperature-high voltage curve between the standard temperature and the standard high voltage, calculate the average high voltage of the temperature-high voltage curve, and determine the high-voltage control curve of the detector according to the average high voltage.

[0064] In an embodiment of the present invention, the standard temperature and standard high pressure in the detector of a litho-density logging tool are queried to determine the relationship between temperature and high pressure according to the changes in temperature and high pressure, so as to ensure subsequent indirect control of high pressure using temperature. Among them, the litho-density logging tool refers to an instrument used for litho-density logging, which consists of a radioactive source and multiple detectors with different source distances. The litho-density logging refers to the improvement and extension of density logging. In addition to recording the density of rocks, it also measures the photoelectric absorption cross-section index Pe of the formation, and Pe is related to lithology. During logging, the downhole instrument records the higher-energy part and the lower-energy part of the scattered gamma rays respectively. The intensity of the scattered gamma rays in the higher-energy part depends on density, and the lower-energy part is mainly related to lithology and also related to density. After processing, pe can be obtained. The detector refers to an instrument used to receive the rays emitted by the radioactive source, which consists of a high-voltage power supply module and a pulse amplifier. The high-voltage power supply module is used to supply high voltage to the detector. The high voltage of different types of detector devices is different in the high-voltage power supply module. For example, the high-voltage power supply of the MCC series of modules is within the range of 12 ± 0.5V. The pulse amplifier is used to amplify the detected information. The detector operates in a proportional manner, and the output pulse amplitude is proportional to the recorded gamma-ray energy. The standard temperature refers to the ideal temperature configured when the detector is produced, and the standard high pressure refers to the ideal high pressure configured when the detector is produced.

[0065] Further, in an embodiment of the present invention, a temperature-high pressure curve between the standard temperature and the standard high pressure is constructed to determine the functional relationship between temperature and high pressure. Among them, the temperature-high pressure curve refers to a function curve with temperature on the x-axis and high pressure on the y-axis, indicating the change of high pressure as the temperature increases. Since the ideal temperature and ideal high pressure of each detector are different, multiple detectors correspond to multiple temperature-high pressure curves.

[0066] In an embodiment of the present invention, the construction of the temperature-high pressure curve between the standard temperature and the standard high pressure includes: constructing a rectangular coordinate system between the standard temperature and the standard high pressure; querying the target high pressure corresponding to the standard temperature in the standard high pressure; constructing a temperature-high pressure point of the target high pressure in the rectangular coordinate system; and connecting the temperature-high pressure points with a curve to obtain the temperature-high pressure curve.

[0067] Among them, the target high pressure refers to the standard high pressure queried in the standard high pressure at a certain temperature.

[0068] Further, in the embodiment of the present invention, the high-pressure average value of the temperature-high-pressure curve is calculated to convert the ideal temperature-high-pressure curve into an actual high-pressure curve that can be used in an actual scenario. Wherein, the high-pressure average value refers to the average value between the high-pressure value of a point on the curve at a certain temperature in the temperature-high-pressure curve and the value of the point at the same temperature on the curves of other detectors.

[0069] In one embodiment of the present invention, calculating the high-pressure average value of the temperature-high-pressure curve includes: obtaining a plurality of detector curves in the temperature-high-pressure curve and querying the same temperature of the plurality of detector curves; extracting the high pressures of the plurality of detectors corresponding to the same temperature; calculating the high-pressure average value between the high pressures of the plurality of detectors by using the following formula:

[0070]

[0071] Wherein, represents the high-pressure average value, J represents the number of detectors corresponding to the temperature-high-pressure curve, represents the high pressure of the detector corresponding to the standard temperature i in the jth temperature-high-pressure curve.

[0072] Further, in the embodiment of the present invention, the high-pressure control curve of the detector is determined according to the high-pressure average value to determine a unified temperature-high-pressure curve during litho-density logging, reducing the cost of configuring different high-pressure modules for each detector, reducing the components required for the litho-density logging instrument, optimizing the litho-density logging instrument, and it can also be used for other radioactive measurement devices. Wherein, the high-pressure control curve is similar to the principle of the temperature-high-pressure curve, but the high pressure therein is composed of the high-pressure average value.

[0073] In one embodiment of the present invention, the principle of determining the high-pressure control curve of the detector according to the high-pressure average value is similar to the principle of constructing the temperature-high-pressure curve between the standard temperature and the standard high pressure, and will not be elaborated further here.

[0074] S2. Measure the actual temperature of the detector, determine the high-pressure control signal of the detector by using the high-pressure control curve and the actual temperature, and collect the nuclear pulse signal of the detector according to the high-pressure control signal.

[0075] In the embodiment of the present invention, the actual temperature of the detector is measured to determine the actual high-pressure magnitude corresponding to the actual temperature by using the high-pressure control curve, realizing the control of the high-pressure module of the detector by using the temperature. Wherein, the actual temperature refers to the temperature actually measured by the detector.

[0076] In one embodiment of the present invention, the actual temperature of the detector is measured by a temperature sensor.

[0077] Wherein, the temperature sensor refers to a sensor that can sense temperature and convert it into an available output signal.

[0078] Further, in the embodiment of the present invention, the high-voltage control signal of the detector is determined by using the high-voltage control curve and the actual temperature, so as to determine the supply voltage of the detector by using the calculated high-voltage control curve. Wherein, the high-voltage control signal refers to the supply voltage signal of the high-voltage power supply module in the detector, that is, the voltage of the circuit in the high-voltage power supply module, which is used to supply power to the detector.

[0079] In one embodiment of the present invention, the high-voltage control signal of the detector is determined by using the high-voltage control curve and the actual temperature by querying the actual high voltage corresponding to the actual temperature in the high-voltage control curve.

[0080] Wherein, the actual high voltage refers to the high voltage corresponding to the actual temperature in the high-voltage control curve.

[0081] Further, in the embodiment of the present invention, according to the high-voltage control signal, the nuclear pulse signal of the detector is collected, so as to collect the gamma rays emitted by the radioactive source received by the detector and determine the size of the rays after the gamma rays are emitted from the radioactive source and pass through the rock formation and are attenuated. Wherein, the nuclear pulse signal refers to a signal that uses nuclear radiation detection devices such as photomultiplier tubes (PMTs) and photodiodes (PDs) to sense and transmit nuclear information and convert it into an electrical signal.

[0082] In one embodiment of the present invention, referring to Figure 2 as shown, collecting the nuclear pulse signal of the detector according to the high-voltage control signal includes:

[0083] S201. According to the high-voltage control signal, receive the optical pulse signal of the radioactive source corresponding to the detector;

[0084] S202. Use the photocathode in the detector to perform signal photoelectric conversion on the optical pulse signal to obtain a photoelectron signal;

[0085] S203. Use the photoanode corresponding to the photocathode to multiply the photoelectron signal step by step to obtain the nuclear pulse signal.

[0086] Optionally, multiplying the photoelectron signal step by step by using the photoanode corresponding to the photocathode to obtain the nuclear pulse signal is realized by a photomultiplier tube.

[0087] S3. Perform amplification and filtering processing on the nuclear pulse signal to obtain an amplified and filtered signal, perform variable gain amplification on the amplified and filtered signal to obtain a variable gain signal, and perform multi-channel equal division processing on the variable gain signal to obtain a multi-channel equal division signal.

[0088] In an embodiment of the present invention, by performing amplification and filtering processing on the nuclear pulse signal, it is used to eliminate out-of-band noise through filtering and amplify the in-band signal for convenient subsequent ADC sampling processing. Among them, the amplified and filtered signal refers to the signal after filtering and amplification.

[0089] In an embodiment of the present invention, refer to Figure 3 As shown, performing amplification and filtering processing on the nuclear pulse signal to obtain an amplified and filtered signal includes:

[0090] S301. Use a preamplifier to amplify the nuclear pulse signal to obtain an amplified signal;

[0091] S302. Use a filter to filter the amplified signal to obtain an amplified and filtered signal.

[0092] Among them, the preamplifier refers to a circuit or electronic device placed between the signal source and the amplifier stage, which is designed specifically to receive weak voltage signals from the signal source, and the filter refers to a frequency selection device that can allow specific frequency components in the signal to pass through while greatly attenuating other frequency components.

[0093] Furthermore, in an embodiment of the present invention, by performing variable gain amplification on the amplified and filtered signal, it is used to automatically adjust the amplification factor of the processed signal using a programmable gain amplifier according to needs to meet the requirements of subsequent circuits and systems. Among them, the variable gain signal refers to the signal after being amplified by the programmable gain amplifier. The programmable gain amplifier includes a fully balanced differential amplifier module, a decoder module, and a resistor switch array module. The resistance ratio of the negative feedback resistor divider in the fully balanced differential amplifier module determines the maximum gain of the amplifier. The attenuation amount of the input signal is controlled by the decoding result of the decoder module on the resistor switch array module, and finally the programmability of the gain of the amplifier is realized. The resistor switch array module is two symmetrical resistor attenuation networks with analog switches, and their input resistances are constant, ensuring a constant load effect on the previous stage.

[0094] In an embodiment of the present invention, performing variable gain amplification on the amplified and filtered signal to obtain a variable gain signal is achieved through a variable gain amplifier.

[0095] Further, in the embodiments of the present invention, the variable gain signal is subjected to multi-channel equal division processing to adapt to 512 channels. After the signal is divided into 512 channels, it enters multiple channels respectively. Among them, the multi-channel equal division signal refers to 512-channel data obtained by equally dividing the signal according to the numerical size.

[0096] In an embodiment of the present invention, the multi-channel equal division processing of the variable gain signal to obtain a multi-channel equal division signal includes: identifying the signal length of the variable gain signal; according to the signal length, calculating the equal division length of the variable gain signal by using the following formula;

[0097]

[0098] where l represents the equal division length of the variable gain signal, L represents the signal length, and 512 represents the number of divided channels;

[0099] According to the equal division length, the variable gain signal is subjected to multi-channel equal division processing to obtain a multi-channel equal division signal.

[0100] Exemplarily, a full-spectrum pulse acquisition circuit board is used to collect pulses of each energy segment of the acquisition detector (full-spectrum sampling), and the acquired energy range is broadened. The lithology density instrument only needs to collect pulses in the energy segment of 50 kev - 724 kev. The energy range collected by this full-spectrum pulse acquisition circuit board will be 10 kev - 900 kev. The full-spectrum pulse acquisition circuit board equally divides the collected pulses into 512 channels of counts according to the energy level. CN1 records the pulse counts in the energy segment of 70 kev - 71.758, and CN512 records the pulse counts in the segment of 898.242 kev - 900 kev.

[0101] S4. Extract the signal reference source corresponding to the lithology density logging instrument, identify the signal full energy peak of the signal reference source, query the signal position corresponding to the signal full energy peak in the multi-channel equal division signal, and use the signal position to calibrate the multi-channel equal division signal to obtain the lithology density logging calibration result of the lithology density logging instrument.

[0102] In the embodiments of the present invention, by extracting the signal reference source corresponding to the lithology density logging instrument, a stable peak high-energy gamma ray source is introduced, and a stable spectrum measure is adopted to solve the problem that the output pulse amplitude of the detector changes with the ambient temperature and the high voltage on the photomultiplier tube. Among them, the signal reference source refers to the pulse signal emitted by the Cs - 662 kev stable spectrum source installed in the detector, and the stable spectrum source refers to a stable spectrum source with a stable characteristic energy peak.

[0103] In an embodiment of the present invention, the extraction of the signal reference source corresponding to the litho-density logging tool is achieved by extracting the output pulse signal of a pre-configured steady-spectrum source using the detector corresponding to the litho-density logging tool.

[0104] Further, the embodiment of the present invention identifies the signal full-energy peak of the signal reference source for subsequent peak stabilization measures using the signal full-energy peak, to solve the problem that the output pulse amplitude of the detector changes with the ambient temperature and the high voltage on the photomultiplier tube, and improve the accuracy of the detection result of the detector. Wherein, the signal full-energy peak refers to the spectral peak in the energy spectrum diagram and is also the center of the waveform. For example, in the energy spectrum diagram centered on the 662 kev energy segment, the position of the 662 kev energy segment is the signal full-energy peak.

[0105] In an embodiment of the present invention, the identification of the signal full-energy peak of the signal reference source includes: performing analog-to-digital conversion on the signal reference source to obtain a digital signal; querying the number of pulses corresponding to the digital signal; constructing an energy spectrum diagram between the digital signal and the number of pulses; and identifying the signal full-energy peak of the signal reference source in the energy spectrum diagram.

[0106] Exemplarily, analog signals of different amplitudes are converted into corresponding digital signals. This digital represents a channel address, and the channel address is used as the address code of the memory to record the number of pulses. The count of each channel address can show the distribution of the pulses. Among them, the abscissa of the energy spectrum diagram is the pulse energy value, and the ordinate is the number of pulses.

[0107] Further, the embodiment of the present invention queries the signal position corresponding to the signal full-energy peak in the multi-channel equal-divided signal to correct the deviated position and improve the accuracy of the logging data. Wherein, the signal position refers to the abscissa of the signal full-energy peak in the energy spectrum diagram.

[0108] In an embodiment of the present invention, the querying of the signal position corresponding to the signal full-energy peak in the multi-channel equal-divided signal includes: constructing a signal energy spectrum diagram of the multi-channel equal-divided signal; extracting the first abscissa of the signal full-energy peak in the energy spectrum diagram; performing consistency matching between the first abscissa and the second abscissa in the signal energy spectrum diagram; and when the consistency matching between the first abscissa and the second abscissa in the signal energy spectrum diagram is successful, taking the successfully matched second abscissa as the signal position corresponding to the signal full-energy peak.

[0109] Further, the embodiment of the present invention performs signal calibration on the multi-channel equal-divided signal using the signal position to solve the problem that the output pulse amplitude of the detector changes with the ambient temperature and the high voltage on the photomultiplier tube, and improve the accuracy of the detection result of the detector.

[0110] In one embodiment of the present invention, the signal calibration of the multi-channel equally divided signals by using the signal position to obtain the lithology density logging calibration result of the lithology density logging instrument includes: obtaining the signal full energy peak corresponding to the signal position, and determining the standard energy spectrum diagram of the signal full energy peak; querying the standard coordinates corresponding to the signal full energy peak in the standard energy spectrum diagram; extracting the standard peak corresponding to the standard coordinates and the position peak corresponding to the signal position; calculating the position difference between the standard peak and the position peak; and performing position translation on the multi-channel equally divided signals according to the position difference to obtain a translated signal, and using the translated signal as the lithology density logging calibration result of the lithology density logging instrument.

[0111] Exemplarily, according to the full spectrum data collected during logging, a suitable mathematical method is used to accurately lock the position of the acquisition channel with an energy of 662 kev emitted from the spectrum stabilization source in the entire spectrum, and then calculate the position difference between this position and the position of 662 kev in the standard full spectrum, and use this difference to correct the displacement of the collected full spectrum to obtain the lithology density logging calibration result.

[0112] It can be seen that in the embodiments of the present invention, first, the standard temperature and standard high pressure in the detector of the litho-density logging tool are queried to determine the relationship between temperature and high pressure according to the changes in temperature and high pressure, ensuring subsequent indirect control of high pressure using temperature. Further, in the embodiments of the present invention, a temperature-high pressure curve between the standard temperature and the standard high pressure is constructed to determine the functional relationship between temperature and high pressure. Further, in the embodiments of the present invention, the average high pressure of the temperature-high pressure curve is calculated to convert the ideal temperature-high pressure curve into an actual high pressure curve that can be used in actual scenarios. Further, in the embodiments of the present invention, according to the average high pressure, the high pressure control curve of the detector is determined to determine a unified temperature-high pressure curve during litho-density logging, reducing the cost of configuring different high pressure modules for each detector and reducing the components required for the litho-density logging tool. Optimizing the litho-density logging tool can also be used in other radioactive measurement devices. In the embodiments of the present invention, the actual temperature of the detector is measured to determine the actual high pressure corresponding to the actual temperature using the high pressure control curve, realizing the control of the high pressure module of the detector using temperature. Further, in the embodiments of the present invention, the high pressure control signal of the detector is determined using the high pressure control curve and the actual temperature to determine the supply voltage of the detector using the calculated high pressure control curve. Further, in the embodiments of the present invention, according to the high pressure control signal, the nuclear pulse signal of the detector is collected to collect the gamma rays emitted by the radioactive source received by the detector, determining the size of the gamma rays after being emitted from the radioactive source, passing through the rock formation, and being attenuated. In the embodiments of the present invention, the nuclear pulse signal is amplified and filtered to eliminate out-of-band noise using filtering and amplify the in-band signal for convenient subsequent ADC sampling processing. Further, in the embodiments of the present invention, the amplified and filtered signal is variably amplified to automatically adjust the amplification factor of the processed signal using a programmable gain amplifier according to needs to meet the requirements of subsequent circuits and systems. Further, in the embodiments of the present invention, the variably amplified signal is divided into multiple equal parts to adapt to 512 channels, and the signal is divided into 512 channels and then enters multiple channels respectively. In the embodiments of the present invention, the signal reference source corresponding to the litho-density logging tool is extracted to introduce a peak-stabilizing high-energy gamma ray source and adopt peak-stabilizing measures to solve the problem that the output pulse amplitude of the detector changes with the ambient temperature and the high pressure on the photomultiplier tube. Further, in the embodiments of the present invention, the signal full-energy peak of the signal reference source is identified to use the signal full-energy peak for subsequent peak-stabilizing measures to solve the problem that the output pulse amplitude of the detector changes with the ambient temperature and the high pressure on the photomultiplier tube, improving the accuracy of the detector detection result. Further,In the embodiment of the present invention, by querying the signal position corresponding to the signal full energy peak in the multi-channel equalized signals, it is used to correct the deviated position and improve the accuracy of logging data. Therefore, a calibration method for litho-density logging results based on a multi-probe high-voltage control algorithm proposed in the embodiment of the present invention can improve the accuracy of litho-density logging results.

[0113] As Figure 4 shown, it is a functional module diagram of a calibration device for litho-density logging results based on a multi-probe high-voltage control algorithm of the present invention.

[0114] The calibration device 400 for litho-density logging results based on the multi-probe high-voltage control algorithm of the present invention can be installed in an electronic device. According to the functions achieved, the calibration device for litho-density logging results based on the multi-probe high-voltage control algorithm can include a control curve determination module 401, a pulse signal acquisition module 402, a signal multi-channel equalization module 403, and a calibration result determination module 404. The modules in the present invention can also be referred to as units, which refer to a series of computer program segments that can be executed by a processor of an electronic device and can complete fixed functions, and are stored in the memory of the electronic device.

[0115] In the embodiment of the present invention, the functions of each module / unit are as follows:

[0116] The control curve determination module 401 is used to query the standard temperature and standard high voltage in the detector of the litho-density logging instrument, construct a temperature-high voltage curve between the standard temperature and the standard high voltage, calculate the high voltage average value of the temperature-high voltage curve, and determine the high voltage control curve of the detector according to the high voltage average value;

[0117] The pulse signal acquisition module 402 is used to measure the actual temperature of the detector, determine the high voltage control signal of the detector by using the high voltage control curve and the actual temperature, and collect the nuclear pulse signal of the detector according to the high voltage control signal;

[0118] The signal multi-channel equalization module 403 is used to perform amplification and filtering processing on the nuclear pulse signal to obtain an amplified and filtered signal, perform variable gain amplification on the amplified and filtered signal to obtain a variable gain signal, and perform multi-channel equalization processing on the variable gain signal to obtain multi-channel equalized signals;

[0119] The calibration result determination module 404 is used to extract the signal reference source corresponding to the litho-density logging instrument, identify the signal full energy peak of the signal reference source, query the signal position corresponding to the signal full energy peak in the multi-channel equalized signals, and use the signal position to perform signal calibration on the multi-channel equalized signals to obtain the litho-density logging calibration result of the litho-density logging instrument.

[0120] Specifically, when the modules in the lithology density logging result calibration device 400 based on the multi-probe high-voltage control algorithm in the embodiments of the present invention are used, they adopt the same technical means as those in the above Figures 1 to 3 lithology density logging result calibration method based on the multi-probe high-voltage control algorithm, and can produce the same technical effects, which will not be elaborated here.

[0121] As Figure 5 shown, it is a schematic structural diagram of an electronic device for implementing the lithology density logging result calibration method based on the multi-probe high-voltage control algorithm of the present invention.

[0122] The electronic device may include a processor 50, a memory 51, a communication bus 52, and a communication interface 53, and may also include a computer program stored in the memory 51 and executable on the processor 50, such as a lithology density logging result calibration program based on the multi-probe high-voltage control algorithm.

[0123] Among them, in some embodiments, the processor 50 may be composed of integrated circuits. For example, it may be composed of a single packaged integrated circuit, or may be composed of multiple integrated circuits with the same or different functions, including a combination of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips. The processor 50 is the control core (Control Unit) of the electronic device, connecting various components of the entire electronic device through various interfaces and lines, and by running or executing programs or modules stored in the memory 51 (such as executing a lithology density logging result calibration program based on the multi-probe high-voltage control algorithm, etc.), and calling data stored in the memory 51, to perform various functions of the electronic device and process data.

[0124] The memory 51 includes at least one type of readable storage medium, which includes flash memory, mobile hard disk, multimedia card, card-type memory (such as SD or DX memory, etc.), magnetic memory, magnetic disk, optical disk, etc. The memory 51 can be an internal storage unit of the electronic device in some embodiments, such as the mobile hard disk of the electronic device. The memory 51 can also be an external storage device of the electronic device in some other embodiments, such as a plug-in mobile hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. equipped on the electronic device. Further, the memory 51 can also include both the internal storage unit and the external storage device of the electronic device. The memory 51 can be used not only to store application software installed on the electronic device and various types of data, such as the code of the database configuration connection program, etc., but also to temporarily store the data that has been output or will be output.

[0125] The communication bus 52 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This bus can be divided into an address bus, a data bus, a control bus, etc. The bus is configured to enable the connection and communication between the memory 51 and at least one processor 50, etc.

[0126] The communication interface 53 is used for the communication between the above-mentioned electronic device 5 and other devices, including a network interface and a user interface. Optionally, the network interface can include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), and is generally used to establish a communication connection between this electronic device and other electronic devices. The user interface can be a display, an input unit (such as a keyboard), and optionally, the user interface can also be a standard wired interface, a wireless interface. Optionally, in some embodiments, the display can be an LED display, a liquid crystal display, a touch liquid crystal display, and an OLED (Organic Light-Emitting Diode) toucher, etc. Among them, the display can also be appropriately referred to as a display screen or a display unit, and is used to display the information processed in the electronic device and to display a visual user interface.

[0127] Figure 5 Only the electronic device with components is shown. Those skilled in the art can understand that Figure 5The structures shown do not constitute a limitation on the electronic device, which may include fewer or more components than those shown, or combine certain components, or have a different component arrangement.

[0128] For example, although not shown, the electronic device may further include a power source (such as a battery) for powering each component. Preferably, the power source may be logically connected to the at least one processor 50 through a power management device, so as to implement functions such as charging management, discharging management, and power consumption management through the power management device. The power source may also include any components such as one or more DC or AC power sources, a recharge device, a power failure detection circuit, a power converter or inverter, a power status indicator, etc. The electronic device may also include various sensors, a Bluetooth module, a Wi-Fi module, etc., which will not be elaborated here.

[0129] It should be understood that the embodiments are for illustrative purposes only and are not limited by this structure in the scope of the patent invention.

[0130] The database configuration connection program stored in the memory 51 in the electronic device is a combination of multiple computer programs. When running in the processor 50, it can implement:

[0131] Query the standard temperature and standard high pressure in the detector of the lithology density logging instrument, construct a temperature-high pressure curve between the standard temperature and the standard high pressure, calculate the average high pressure of the temperature-high pressure curve, and determine the high pressure control curve of the detector according to the average high pressure;

[0132] Measure the actual temperature of the detector, use the high pressure control curve and the actual temperature to determine the high pressure control signal of the detector, and collect the nuclear pulse signal of the detector according to the high pressure control signal;

[0133] Perform amplification and filtering processing on the nuclear pulse signal to obtain an amplified and filtered signal, perform variable gain amplification on the amplified and filtered signal to obtain a variable gain signal, and perform multi-channel equal division processing on the variable gain signal to obtain a multi-channel equal division signal;

[0134] Extract the signal reference source corresponding to the lithology density logging instrument, identify the signal full energy peak of the signal reference source, query the signal position corresponding to the signal full energy peak in the multi-channel equal division signal, and use the signal position to calibrate the multi-channel equal division signal to obtain the lithology density logging calibration result of the lithology density logging instrument.

[0135] Specifically, the specific implementation method of the above computer program by the processor 50 may refer to Figure 1 the description of the relevant steps in the corresponding embodiments and will not be elaborated here.

[0136] Furthermore, if the modules / units integrated in the electronic device are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium. The storage medium can be volatile or non-volatile. For example, the computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM, Read-Only Memory).

[0137] The present invention also provides a storage medium. The readable storage medium stores a computer program, and when the computer program is executed by a processor of an electronic device, it can implement:

[0138] Query the standard temperature and standard high pressure in the detector of the litho-density logging tool, construct a temperature-high pressure curve between the standard temperature and the standard high pressure, calculate the average high pressure of the temperature-high pressure curve, and determine the high pressure control curve of the detector according to the average high pressure;

[0139] Measure the actual temperature of the detector, determine the high pressure control signal of the detector by using the high pressure control curve and the actual temperature, and collect the nuclear pulse signal of the detector according to the high pressure control signal;

[0140] Perform amplification and filtering processing on the nuclear pulse signal to obtain an amplified and filtered signal, perform variable gain amplification on the amplified and filtered signal to obtain a variable gain signal, and perform multi-channel equal division processing on the variable gain signal to obtain a multi-channel equal division signal;

[0141] Extract the signal reference source corresponding to the litho-density logging tool, identify the signal full energy peak of the signal reference source, query the signal position corresponding to the signal full energy peak in the multi-channel equal division signal, and perform signal calibration on the multi-channel equal division signal by using the signal position to obtain the litho-density logging calibration result of the litho-density logging tool.

[0142] In several embodiments provided by the present invention, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules is only a logical function division, and there can be other division methods in actual implementation.

[0143] The module described as a separation component may or may not be physically separated. The component shown as a module may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0144] In addition, in each embodiment of the present invention, each functional module can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated unit can be implemented in the form of hardware, or in the form of hardware plus software functional modules.

[0145] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms.

[0146] Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to cover all changes within the meaning and scope of the equivalent elements of the claims in the present invention. Any associated drawing marks in the claims should not be regarded as limiting the claims involved.

[0147] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0148] The above description is only the specific implementation manners of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A calibration method for lithology density logging results based on a multi-probe high-voltage control algorithm, characterized in that, the method includes: Query the standard temperature and standard high voltage in the detectors of the lithology density logging instrument, construct a temperature-high voltage curve between the standard temperature and the standard high voltage, calculate the high voltage average value of the temperature-high voltage curve, and determine the high voltage control curve of the detector according to the high voltage average value; Measure the actual temperature of the detector, use the high voltage control curve and the actual temperature to determine the high voltage control signal of the detector, and collect the nuclear pulse signal of the detector according to the high voltage control signal; Perform amplification and filtering processing on the nuclear pulse signal to obtain an amplified and filtered signal, perform variable gain amplification on the amplified and filtered signal to obtain a variable gain signal, and perform multi-channel equal division processing on the variable gain signal to obtain a multi-channel equal division signal; Extract the signal reference source corresponding to the lithology density logging instrument, identify the signal full energy peak of the signal reference source, query the signal position corresponding to the signal full energy peak in the multi-channel equal division signal, and use the signal position to perform signal calibration on the multi-channel equal division signal to obtain the lithology density logging calibration result of the lithology density logging instrument.

2. The method according to claim 1, characterized in that, the constructing of the temperature-high voltage curve between the standard temperature and the standard high voltage includes: Construct a rectangular coordinate system between the standard temperature and the standard high voltage; Query the target high voltage corresponding to the standard temperature in the standard high voltage; Construct a temperature-high voltage point of the target high voltage in the rectangular coordinate system; Connect the temperature-high voltage points by a curve to obtain the temperature-high voltage curve.

3. The method according to claim 1, characterized in that, the calculating of the high voltage average value of the temperature-high voltage curve includes: Obtain multiple detector curves in the temperature-high voltage curve, and query the same temperature of the multiple detector curves; Extract multiple detector high voltages corresponding to the same temperature; Use the following formula to calculate the high voltage average value between the multiple detector high voltages: Wherein, represents the high-voltage average value, J represents the number of detectors corresponding to the temperature-high-voltage curve, represents the detector high voltage corresponding to the standard temperature i in the j-th temperature-high-voltage curve.

4. The method according to claim 1, characterized in that, the collecting of the nuclear pulse signal of the detector according to the high voltage control signal includes: Receive the optical pulse signal of the radioactive source corresponding to the detector according to the high voltage control signal; Perform signal photoelectric conversion on the optical pulse signal by using the photocathode in the detector to obtain a photoelectron signal; Perform step-by-step multiplication on the photoelectron signal by using the photoanode corresponding to the photocathode to obtain the nuclear pulse signal.

5. The method according to claim 1, characterized in that, the performing of multi-channel equal division processing on the variable gain signal to obtain a multi-channel equal division signal includes: Identify the signal length of the variable gain signal; According to the signal length, use the following formula to calculate the equal division length of the variable gain signal; where, l represents the equal division length of the variable gain signal, L represents the signal length, and 512 represents the number of channels divided. Perform multi-channel equal division processing on the variable gain signal according to the equal division length to obtain multi-channel equal division signals.

6. The method according to claim 1, wherein, identifying the signal full energy peak of the signal reference source includes: performing analog-to-digital conversion on the signal reference source to obtain a digital signal; querying the number of pulses corresponding to the digital signal; constructing an energy spectrum diagram between the digital signal and the number of pulses; identifying the signal full energy peak of the signal reference source in the energy spectrum diagram.

7. The method according to claim 1, wherein, using the signal position to calibrate the multi-channel equal division signal to obtain the lithology density logging calibration result of the lithology density logging instrument includes: acquiring the signal full energy peak corresponding to the signal position, and determining the standard energy spectrum diagram of the signal full energy peak; querying the standard coordinates corresponding to the signal full energy peak in the standard energy spectrum diagram; extracting the standard peak corresponding to the standard coordinates and the position peak corresponding to the signal position; calculating the position difference between the standard peak and the position peak; performing position translation on the multi-channel equal division signal according to the position difference to obtain a translated signal, and using the translated signal as the lithology density logging calibration result of the lithology density logging instrument.

8. A device for calibrating the lithology density logging result based on a multi-probe high-voltage control algorithm, wherein, the device includes: a control curve determination module for querying the standard temperature and standard high voltage in the detector of the lithology density logging instrument, constructing a temperature-high voltage curve between the standard temperature and the standard high voltage, calculating the high voltage average value of the temperature-high voltage curve, and determining the high voltage control curve of the detector according to the high voltage average value; a pulse signal acquisition module for measuring the actual temperature of the detector, determining the high voltage control signal of the detector by using the high voltage control curve and the actual temperature, and acquiring the nuclear pulse signal of the detector according to the high voltage control signal; a signal multi-channel equal division module for performing amplification and filtering processing on the nuclear pulse signal to obtain an amplified and filtered signal, performing variable gain amplification on the amplified and filtered signal to obtain a variable gain signal, and performing multi-channel equal division processing on the variable gain signal to obtain multi-channel equal division signals; a calibration result determination module for extracting the signal reference source corresponding to the lithology density logging instrument, identifying the signal full energy peak of the signal reference source, querying the signal position corresponding to the signal full energy peak in the multi-channel equal division signal, and using the signal position to calibrate the multi-channel equal division signal to obtain the lithology density logging calibration result of the lithology density logging instrument.

9. An electronic device, wherein, the electronic device includes: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and when the computer program is executed by the at least one processor, the at least one processor is enabled to execute the calibration method for lithology density logging results based on the multi-probe high-voltage control algorithm as described in any one of claims 1 to 7.

10. A computer-readable storage medium stores a computer program. Characterized in that when the computer program is executed by a processor, it implements the calibration method for lithology density logging results based on the multi-probe high-voltage control algorithm as described in any one of claims 1 to 7.

Images