CN1215326C - Method and system for automatically measuring roch complex electrical resistance by coil method - Google Patents
Method and system for automatically measuring roch complex electrical resistance by coil method Download PDFInfo
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- CN1215326C CN1215326C CN 02117896 CN02117896A CN1215326C CN 1215326 C CN1215326 C CN 1215326C CN 02117896 CN02117896 CN 02117896 CN 02117896 A CN02117896 A CN 02117896A CN 1215326 C CN1215326 C CN 1215326C
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Abstract
The present invention relates to a method and a system for automatically scanning and measuring rock complex resistivity by a coil method, wherein the system comprises a computer, a signal generation circuit, a coil measuring system, a sampling phase shift circuit, a digital storage oscilloscope and a locking phase amplifier, wherein the computer is used for controlling and generating measurement signals and processing measuring results, the signal generation circuit is used for generating measuring transmission signals and transmitting the measuring transmission signals to the coil measuring system and the sampling phase shift circuit, the coil measuring system is used for measuring rocks to be measured and outputting measuring signals to the phase locking amplifier, the sampling phase shift circuit is used for outputting the processed measuring transmission signals to the digital storage oscilloscope and the phase locking amplifier, the digital storage oscilloscope is used for receiving the measuring transmission signals which are fed back by the sampling phase shift circuit and outputting the measuring transmission signals to the computer and the phase locking amplifier is used for outputting the measuring signals which are output by the coil measuring system to the computer. The present invention can accurately and fully scanning and measuring the complex resistivity of rocks within certain frequency ranges. Thus, electricity parameters of the rocks are integrally obtained, and integral technical data is better provided for the detection of petroleum and natural gas and the discrimination of oil layers and water layers.
Description
Technical field:
The present invention relates to a kind of method and system of automatically measuring roch complex electrical resistance by coil method, particularly a kind of method and system thereof that adopts coil method and automatic frequency sweep mode to test the rock complex resistivity.
Background technology:
At present, a lot of for the device of physical test of rock, when in the laboratory, little core sample being measured, generally adopted the electrode method to measure in the past, also have and adopt the frequency sweep method to measure complex resistivity, still, do not adopt coil method to measure; At the petroleum prospecting scene, though there is the coil method of employing to carry out the measurement of formation conductivity, do not adopt sweep measurement, do not measure complex parameter yet, more there is not frequency of utilization information.
Experimental studies have found that according to long-term petrophysical property: the electrical parameter of rock, for example: resistivity, specific inductive capacity, there is dispersion phenomenon, the water saturation of its frequency dispersion parameter and rock has extraordinary corresponding relation, and the plural number part of these two electrical parameters includes abundant rock information, this information can be used for surveying better the oil gas situation, distinguishes oil-water-layer.Adopt the method for coil frequency sweep can measure rock complex resistivity effectively, obtain above-mentioned rock electrical parameter, therefore, adopt coil method sweep measurement rock complex resistivity to have very important significance for oil-gas exploration.
Adopt the complex resistivity of coil method sweep measurement rock and solution, have very big difficulty than foregoing measuring method, it relates to difficult problems such as frequency selection, coil system design, directly coupling signal removal, high s/n ratio Detection of weak; So, still do not have respective coil method rock complex resistivity automatic frequency sweep measuring system at present.
Summary of the invention:
Fundamental purpose of the present invention is to provide a kind of method and system of automatically measuring roch complex electrical resistance by coil method, it can be in the certain frequency scope sweep measurement rock complex resistivity (or telegram in reply conductance) exactly, more completely obtain the electrical parameter of rock, being that the differentiation of the detection of petroleum gas and oil-water-layer provides accurate complete technical data better.
The object of the present invention is achieved like this:
The method that a kind of complex resistivity autoscan is measured adopts the automatic frequency sweep mode by measuring coil system to measured medium emission measurement signal; By receiving the measuring-signal of this process measured medium, obtain the complex resistivity or the telegram in reply conductance of measured medium.
The concrete steps of described method are:
Step 1: pass through to measure coil system emission measurement signal with a beginning frequency of setting that opens;
Step 2: read the range value that measurement that digital oscilloscope measures transmits;
Step 3: calculate and record transmitter current value;
Step 4: the fixed phase of adjusting lock-in amplifier;
Step 5: it is automatic range that lock-in amplifier is set;
Step 6: the real part and the imaginary values of reading in measured signal;
Step 7:, then finish if frequency sweep finishes;
Step 8: next frequency of signalization generator, execution in step 2.
A kind of coil method rock complex resistivity autoscan measuring system which comprises at least:
Computing machine is used to control the generation measuring-signal and handles the measurement result that reads;
Signal generating circuit is used for producing to measure under the control of computing machine transmitting; And this measurement transmitted send the measurement coil system that is connected to its output terminal and sampling phase-shift circuit respectively to;
Measure coil system, be used to connect signal generating circuit tested rock is measured; And this measuring-signal outputed to lock-in amplifier;
The sampling phase-shift circuit is used to measure transmit and outputs to digital storage oscilloscope and the lock-in amplifier that is attached thereto respectively after handling;
Digital storage oscilloscope, the measurement that is used to receive sampling phase-shift circuit feedback transmits, and this signal is outputed to computing machine;
Lock-in amplifier, the measuring-signal that is used for measuring coil system output outputs to computing machine.
Described signal generating circuit is provided with signal generator and power amplifier at least, and the input of this signal generator is connected with computing machine, and its output is connected to the input end of power amplifier.
The input end of this sampling phase-shift circuit is connected to the output terminal of signal generating circuit, and the input end of digital storage oscilloscope connects the output terminal of this sampling phase-shift circuit, and the output terminal of this digital storage oscilloscope is connected with computing machine.
Described measurement coil system at least by transmitting coil, go straight coupling coil and receiving coil to form; This transmitting coil, the internal diameter that removes straight coupling coil and receiving coil and external diameter are equal, and along its axial installing; This goes straight coupling coil to be located between transmitting coil and the receiving coil.
The input end of this transmitting coil connects the output terminal of signal generating circuit, and the measuring-signal of this transmitting coil emission is received by receiving coil, and is sent to the input end of the lock-in amplifier that is attached thereto.
It also comprises the rock core fastener that is used for fixing sample and measures the coil system position.
Adopt gpib bus to connect between described computing machine, signal generating circuit, sampling phase-shift circuit, lock-in amplifier and the digital storage oscilloscope.
The method of the measurement result that computer control generation measuring-signal and processing are read specifically comprises following step:
Step 1: computer installation system initial parameter and signal generator open the beginning frequency;
Step 2: computing machine reads the range value that measurement that digital oscilloscope measures transmits;
Step 3: COMPUTER CALCULATION also writes down the transmitter current value;
Step 4: computing machine is adjusted the fixed phase of lock-in amplifier;
Step 5: the computer installation lock-in amplifier is an automatic range;
Step 6: computing machine reads in the real part and the imaginary values of measured signal;
Step 7:, then finish if frequency sweep finishes;
Step 8: next frequency of computer installation signal generator, execution in step 2.
The frequency range of signal frequency sweep is 25kHz～15MHz.
When sample was solid body, described solid body was a hollow circular cylinder; When sample was solution, this solution added container; And measure coil system and be arranged on the sample center.
The present invention is by by computing machine, signal generating circuit, measurement coil system, the sampling automatically measuring roch complex electrical resistance by coil method system that phase-shift circuit, digital storage oscilloscope and lock-in amplifier constituted, can be in the certain frequency scope accurately, sweep measurement rock complex resistivity all sidedly, thereby intactly obtained the electrical parameter of rock, provide accurate complete technical data for the detection of petroleum gas and the differentiation of oil-water-layer better.
Description of drawings:
Fig. 1 is a theory of constitution block diagram of the present invention.
Fig. 2 is a coil system structural representation of the present invention.
Fig. 3 is a rocklet sample synoptic diagram of the present invention.
Used container synoptic diagram when Fig. 4 is used to measure solution for the present invention.
Fig. 5 is a system monitoring software flow pattern of the present invention.
Fig. 6, Fig. 7 are a test result of the present invention.
Embodiment:
Below, the present invention is described in further detail with specific embodiment in conjunction with the accompanying drawings:
Referring to Fig. 1, one embodiment of the invention are made up of signal generator 1, power amplifier 2, sampling phase-shift circuit 3, coil system 4, rock core fastener 5, lock-in amplifier 6, digital storage oscilloscope 7 and computing machine 8.Adopt general parallel interface bus (General-PurposeInterface Bus is called for short GPIB) to be electrically connected between above-mentioned each parts.
Wherein this computing machine 8 is the control center of native system, and its control miscellaneous part is operated accordingly, and it has constituted a complete sweep measurement systems control division branch with being stored in its inner Control Software.Under the control of this computing machine 8, the scope of swept-frequency signal is 25kHz～15MHz, and evenly increases with logarithmic scale, exports a plurality of discrete point in frequency.Generally speaking, the output current of signal generator 1 is less, and its output impedance is 50 Ω; Transmitting coil is an inductive load, and its impedance is very big with frequency change, so above-mentioned signal generator 1 can not finely mate with transmitting coil.Do not adopt signal generator 1 directly to drive transmitting coil in the present embodiment; But earlier the signal through 1 output of 2 pairs of signal generators of power amplifier carries out power amplification, outputs to transmitting coil again after then.
Because the swept frequency range relative bandwidth of using is very wide, and the impedance variation of transmitting coil is also very big, even it is all identical on all frequencies to introduce the gain that feedback is difficult to also to accomplish that power amplifier realizes, promptly on different frequencies, the output current of transmitting coil is not necessarily identical; Therefore in the present embodiment, adopt digital storage oscilloscope 7 to measure the size of transmitter current, and the data of measuring are sent in the connected computing machine so that carry out the correction that electric current changes.In addition, another effect of digital storage oscilloscope 7 is whether the waveform of monitors transmitted electric current in measuring process has distortion phenomenon, and suitably adjusts transmitter current on this basis, to guarantee the purity of each discrete point in frequency.Sampling phase-shift circuit 3 is converted to the voltage signal of homophase with it with transmitter current, as the voltage input signal of lock-in amplifier 6 reference channels.The electric current of transmitting coil emission with on every side measured medium effect after in receiving coil, produce the induced potential signal, this induced potential promptly reflects the size of this medium conductivity, therefore being needs the signal that detects.
Because the voltage signal in the receiving coil is very faint, the conventional testing circuit of sampling can't detect, and therefore adopts lock-in amplifier 6 to detect in this enforcement, then this detected value is passed to computing machine 8.In computing machine 8, through handling, this voltage amplitude value and phase data are converted into complex resistivity or telegram in reply conductance.
Referring to Fig. 2, Fig. 3, rock core fastener 5 is responsible for the fixing of sample and coil system 4 positions.The structure of coil system 4 comprises transmitting coil T, receiving coil R and removes directly coupling signal coil B as shown in Figure 2; The position of this removal directly coupling signal coil B is located at the centre at transmitting coil T and receiving coil R.Coil system 4 is placed on the central authorities of sample, and transmitting coil T transmits during measurement, and receiving coil R receives the induction electromotive force that feeds back from measured medium.
Referring to Fig. 4, the measuring method when it is fluid for measured medium; Promptly adopt cell therefor C that measured medium is measured.This coil system 4 is fixed on the central authorities of container C, coil and solution insulation.
Referring to Fig. 5, the various piece circuit is all worked under the control of computing machine in the whole sweep measurement system, and concrete flow process is:
At first, each instrument is carried out initialization, comprise setting, amplitude output signal and the false alarm etc. of setting, instrument range and the sensitivity of instrument self checking, instrument working method;
Then, count according to the discrete frequency of the frequency range of whole sweep measurement system works and sweep measurement and to calculate logarithmic scale frequency sweep increase step-length down, and be initial frequency the frequency configuration of signal generator;
Utilize digital storage oscilloscope 7 to measure the size of signal voltage on the transmitter current sample resistance, calculate and write down the size of transmitter current according to the voltage that measures;
Detect principle according to small-signal, adjust the reference signal phase place of lock-in amplifier, make that detected real part voltage and imaginary part voltage are more approaching on the order of magnitude, so that make full use of the detection sensitivity of lock-in amplifier;
Because the size of measuring-signal differ greatly (reaching several magnitude) under the different frequency in the sweep measurement, therefore on each discrete point in frequency all lock-in amplifier be set to automatic range and detect, to be chosen as the immediate range of measuring-signal, improve measuring accuracy;
Repeat above-mentioned survey record, till all discrete point in frequency measure in sweep measurement.
Referring to Fig. 6, Fig. 7, it is the result of a sample of employing the present invention measurement, and wherein, Fig. 6 is the relation of signal amplitude and dielectric conductance rate, and Fig. 7 is the variation relation of signal phase with conductivity.
Above embodiment is only in order to explanation and unrestricted technical scheme of the present invention; Although with reference to above-mentioned all embodiments the present invention is had been described in detail, those of ordinary skill in the art can not deny: each technical characterictic among the present invention still can be done corresponding modification, adjusts or be equal to replacement; But all do not break away from any modification or partial replacement of the spirit and scope of the present invention, all should be disclosed technical characterictic, and all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1, a kind of method of rock complex resistivity autoscan measurement is characterized in that: adopt the automatic frequency sweep mode by measuring coil system to measured medium emission measurement signal; By receiving the measuring-signal of this process measured medium; Obtain the complex resistivity of measured medium; Concrete step is:
Step 1: pass through to measure coil system emission measurement signal with a beginning frequency of setting that opens;
Step 2: read the range value that measurement that digital oscilloscope measures transmits;
Step 3: calculate and record transmitter current value;
Step 4: the fixed phase of adjusting lock-in amplifier;
Step 5: it is automatic range that lock-in amplifier is set;
Step 6: the real part and the imaginary values of reading in measured signal;
Step 7:, then finish if frequency sweep finishes;
Step 8: if scanning does not finish, next frequency of signalization generator then, execution in step 2-8.
2, a kind of coil method rock complex resistivity autoscan measuring system is characterized in that: which comprises at least:
Computing machine is used to control the generation measuring-signal and handles the measurement result that reads;
Signal generating circuit is provided with signal generator and power amplifier at least, and the input of this signal generator is connected with computing machine, and its output is connected to the input end of power amplifier; This signal generating circuit is used for producing to measure under the control of computing machine transmitting; And this measurement transmitted send the measurement coil system that is connected to its output terminal and sampling phase-shift circuit respectively to;
Measure coil system, described measurement coil system at least by transmitting coil, go straight coupling coil and receiving coil to form; This transmitting coil, the internal diameter that removes straight coupling coil and receiving coil and external diameter are equal, and along its axial installing; This goes straight coupling coil to be located between transmitting coil and the receiving coil; The input end of this transmitting coil connects the output terminal of signal generating circuit, and the measuring-signal of this transmitting coil emission is received by receiving coil, and is sent to the input end of the lock-in amplifier that is attached thereto; This measurement coil system is used to connect signal generating circuit tested rock is measured; And this measuring-signal outputed to lock-in amplifier;
The sampling phase-shift circuit, the input end of this sampling phase-shift circuit is connected to the output terminal of signal generating circuit, the input end of digital storage oscilloscope connects the output terminal of this sampling phase-shift circuit, the output terminal of this digital storage oscilloscope is connected with computing machine, is used to measure transmit output to digital storage oscilloscope and the lock-in amplifier that is attached thereto respectively after handling;
Digital storage oscilloscope, the measurement that is used to receive sampling phase-shift circuit feedback transmits, and this signal is outputed to computing machine;
Lock-in amplifier, the measuring-signal that is used for measuring coil system output outputs to computing machine.
3, coil method rock complex resistivity autoscan measuring system according to claim 2 is characterized in that: it also comprises the rock core fastener that is used for fixing sample and measures the coil system position.
4, coil method rock complex resistivity autoscan measuring system according to claim 2 is characterized in that: adopt general parallel interface bus to connect between described computing machine, signal generating circuit, sampling phase-shift circuit, lock-in amplifier and the digital storage oscilloscope.
5, coil method rock complex resistivity autoscan measuring system according to claim 2, it is characterized in that: the frequency range of signal frequency sweep is 25kHz～15MHz.
6, coil method rock complex resistivity autoscan measuring system according to claim 2, it is characterized in that: when sample was solid body, described solid body was a hollow circular cylinder; When sample was solution, this solution added container; And measure coil system and be arranged on the sample center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02117896 CN1215326C (en) | 2002-05-27 | 2002-05-27 | Method and system for automatically measuring roch complex electrical resistance by coil method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02117896 CN1215326C (en) | 2002-05-27 | 2002-05-27 | Method and system for automatically measuring roch complex electrical resistance by coil method |
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| Publication Number | Publication Date |
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| CN1461950A CN1461950A (en) | 2003-12-17 |
| CN1215326C true CN1215326C (en) | 2005-08-17 |
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| CN 02117896 Expired - Fee Related CN1215326C (en) | 2002-05-27 | 2002-05-27 | Method and system for automatically measuring roch complex electrical resistance by coil method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101937105B (en) * | 2010-04-28 | 2013-03-20 | 中国石油大学(北京) | Method for detecting hydrocarbon reservoir by low-frequency signal and device thereof |
| CN102546007A (en) * | 2011-12-30 | 2012-07-04 | 浙江大学 | Device and method for realizing frequency measurement of multifrequency microwave signals by using Brillouin scattering |
| CN107748291B (en) * | 2017-11-17 | 2024-04-26 | 长江大学 | Rock complex resistivity measuring device and system thereof |
| CN108508274B (en) | 2018-06-05 | 2020-10-09 | 中国石油天然气股份有限公司 | Resistivity measurement method, device and system |
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