CN110007353A - Induction logging formation conductivity measuring instrument and method - Google Patents
Induction logging formation conductivity measuring instrument and method Download PDFInfo
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- CN110007353A CN110007353A CN201910282917.8A CN201910282917A CN110007353A CN 110007353 A CN110007353 A CN 110007353A CN 201910282917 A CN201910282917 A CN 201910282917A CN 110007353 A CN110007353 A CN 110007353A
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
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Abstract
The present invention discloses a kind of induction logging formation conductivity measuring instrument and method, measuring instrument includes including transmitting coil and receiving coil, transmitting coil is connected with launch driving circuit, in transmitting coil or on transmitting coil or any position of transmitting coil proximity is equipped with supervision induction coil, transmitting coil generates induced electromotive force in receiving coil, supervision induction coil, and receiving coil and supervision induction coil are respectively connected with emf measuring circuit.The measuring instrument ensure that measurement accuracy, simplify design of measuring system and design.Measurement method increases two-way switching switch on the basis of measuring instrument or three-dimensional switching switch introduces many measuring methods, to increase substantially the interference free performance of measuring system, rejects zero bias, inhibits temperature drift.
Description
Technical field
The present invention relates to a kind of induction logging formation conductivity measuring instrument and methods, belong to induction logging instrument and induction
Signal measurement method and technology field.
Background technique
Geophysical log is referred to as " eyes " of underground, measures lithology, physical property, permeability and the oily of down-hole formation
Property etc..Main physical means include that electromagnetic method, acoustic method, radiometric method, temperature, pressure measurement and fluid-solid are direct
Sampling and measuring etc..In all rock parameters of logger measurement, resistivity is especially important.Resistivity measurements are that determination contains
Hydrocarbon saturation especially determines the basis of the unimpinged undisturbed formation saturation degree in reservoir, is estimated according to formation resistivity full
It is the important content of formation evaluation with degree.
Induction logging instrument application electromagnetic induction principle measures formation conductivity, by Doll in introducing oil well logging in 1949
Since, tremendous development can be obtained in unique advantage used in non-conductive drilling fluid by it, with lateral class logger advantage
Complementation provides reliable formation conductivity relevant information for geologic interpretation expert.With the progress of whole science and technology, induction is surveyed in recent years
Well technology has significant progress, and array induction instrument obtains the application that routinizes, and three micro- induction instrument aratus are gradually mature.Although induction
Logger has developed several generations, but the fundamental method of measurement of induction logging instrument does not become.
As shown in Figure 1, it includes transmitting coil and receiving coil that heritage, which answers logger, transmitting coil is connected with transmitting and drives
Dynamic circuit.It is I that launch driving circuit generates a current strength in transmitting coilTAlternation emission current, emission current exists
Induced electromotive force and induced current are inspired in receiving coil and stratum.It is this to be known as by the induction field that emission current directly excites
Induction field, corresponding induced electromotive force are an induced electromotive force, and corresponding induced current is an induced current.Stratum
In an induced current secondary induced electromotive force can be excited in receiving coil again.An induced electromotive force in receiving coil
It is unrelated with formation conductivity, and amplitude is much higher than secondary induced electromotive force, for the ease of the secondary induced electromotive force of precise measurement, people
Introduce the shielded coil contrary with main coil coiling；When shielded coil is concatenated with receiving coil, by adjusting shielding
The number of turns of coil and/or position make an induced electromotive force in shielded coil and an induction electric in main receiving coil
Gesture is equal in magnitude, contrary, makes an induced electromotive force zero in entire receiving coil system, thus prominent secondary induced electricity
Kinetic potential.An induction current intensity in stratum is directly proportional to formation conductivity, the secondary sense thus generated in receiving coil
It answers electromotive force intensity directly proportional to formation conductivity, therefore, can be obtained by the secondary induced electromotive force in measurement receiving coil
Obtain the conductivity on stratum, basic relational expression are as follows:
Wherein, σaFor measured formation conductivity, referred to as apparent conductivity；URFor the secondary induction electric in receiving coil
Gesture；K is instrumental constant, is defined as under unity emitter current excitation, and instrument is generated in the uniform stratum of Their unit conductance rate
Secondary induced electromotive force intensity.
Heritage answers the measurement method of logger to design according to formula (1), i.e., it is strong to measure secondary induced electromotive force simultaneously
Spend URWith emission current intensity IT.I is measured using current transformer or current transformer generally in launch driving circuitT.Using
When this measurement method, for the measurement accuracy for guaranteeing formation conductivity, it is necessary to while accurately measuring secondary induced electromotive force intensity
URWith emission current intensity IT.Induced electromotive force is measured, uses induction coil as sensor；And emission current intensity is measured, electricity consumption
Current transformer is as sensor.When being measured with two kinds of dissimilar sensors, it is difficult to ensure that matched measurement accuracy, is easy
It attends to one thing and lose sight of another.In addition, measured current strength and true emission current intensity ITBetween there is a certain error,
And this error changes with the temperature change of measurement environment, therefore, this traditional measurement method realizes more difficult, easy limitation
Stratum apparent conductivity σaMeasurement accuracy.
Summary of the invention
In view of the drawbacks of the prior art, the present invention provides a kind of induction logging formation conductivity measuring instrument and method, makes
The signal for calculating conductivity has the measurement accuracy to match, simplifies design of measuring system and realizes, as long as improving electromotive force
The precision of measurement module, so that it may improve stratum apparent conductivity σaMeasurement accuracy.
In order to solve the technical problem, the technical solution adopted by the present invention are as follows: induction logging formation conductivity measuring instrument
Device, including transmitting coil and receiving coil, transmitting coil are connected with launch driving circuit, in transmitting coil or on transmitting coil
Or any position of transmitting coil proximity is equipped with supervision induction coil, transmitting coil is in receiving coil, supervision induction coil
Induced electromotive force is generated, receiving coil and supervision induction coil are respectively connected with emf measuring circuit.
It is switched as a further improvement, being equipped with two-way switching between receiving coil emf measuring circuit connected to it,
The contact 1 of two-way switching switch is connected with supervision induction coil, and contact 2 is connected with receiving coil.
As a further improvement, supervision induction coil emf measuring circuit connected to it between, receiving coil and its
A three-dimensional switching switch, the short circuit of contact 0 of two three-dimensional switching switches are equipped between the emf measuring circuit of connection
Or ground connection, the contact 1 of two three-dimensional switching switches are connected with supervision induction coil, the contact 2 of two three-dimensional switching switches
It is connected respectively with supervision induction coil, receiving coil.
As a further improvement, the quantity of receiving coil be N number of, N >=1, each receiving coil be respectively connected with one it is electronic
Gesture measuring circuit.
As a further improvement, the emf measuring circuit that supervision induction coil is connect with receiving coil includes preceding storing
Big circuit, analog to digital conversion circuit, superposition de-noising circuit and digital detecting circuit.
The invention also discloses a kind of induction logging formation conductivity measurement methods, comprising the following steps: S01), construction electricity
Conductance measuring circuit, the electrical conductivity measurement circuit include transmitting coil and receiving coil, and transmitting coil is connected with transmitting driving
Circuit, in transmitting coil or on transmitting coil or any position of transmitting coil proximity is equipped with supervision induction coil, transmitting
Coil generates induced electromotive force in receiving coil, supervision induction coil, and receiving coil and supervision induction coil are respectively connected with
Emf measuring circuit；S02), the induced electromotive force V of supervision induction coil is measured using emf measuring circuitTWith reception line
The induced electromotive force U of circleR, according to formulaCalculate formation conductivity, σaFor measured stratum electricity
Conductance；K is instrumental constant, is defined as under unity emitter current excitation, produced by instrument is in the uniform stratum of Their unit conductance rate
Secondary induced electromotive force intensity；α is the induced electromotive force and transmitting coil that transmitting coil generates in supervision induction coil
The proportionality coefficient of emission current.
As a further improvement, handling electrical conductivity measurement circuit, surveyed in receiving coil electromotive force connected to it
It measures and is switched between circuit equipped with two-way switching, the contact 1 of two-way switching switch is connected with supervision induction coil, contact 2 and reception
Coil is connected, and controls two-way switching switch and connect respectively with contact 1,2 according to certain number ratio, then according to formulaCalculate formation conductivity, u1And v1It is electronic when indicating two-way switching switch connection contact 1
The induced electromotive force of receiving coil and supervision induction coil that gesture measuring circuit detects, u2And v2Indicate that two-way switching switch connects
When logical contact 2, the induced electromotive force of receiving coil and supervision induction coil that emf measuring circuit detects.
As a further improvement, electrical conductivity measurement circuit is handled, it is connected to it electronic in supervision induction coil
It is equipped with a three-dimensional switching between gesture measuring circuit, between receiving coil emf measuring circuit connected to it to switch, two
The short circuit or ground connection of contact 0 of a three-dimensional switching switch, the contact 1 of two three-dimensionals switching switches with supervision induction coil phase
Even, the contact 2 of two three-dimensional switching switches is connected with supervision induction coil, receiving coil respectively, and control three-dimensional switching switch is pressed
It is connect respectively with contact 0,1,2 according to certain number ratio, then according to formulaCalculate formation conductivity, u0And v0Indicate that three-dimensional switching switch connects
When logical contact 0, the induced electromotive force of receiving coil and supervision induction coil that emf measuring circuit detects, u1And v1It indicates
When three-dimensional switches switch connection contact 1, the induced electricity of receiving coil and supervision induction coil that emf measuring circuit detects
Kinetic potential, u2And v2When indicating three-dimensional switching switch connection contact 2, the receiving coil and supervision that emf measuring circuit detects are felt
Answer the induced electromotive force of coil.
As a further improvement, introducing an attenuator circuit, attenuation coefficient ATT, ATT are less than 1, at this time according to formulaCalculate formation conductivity.
Beneficial effects of the present invention: the present invention is in transmitting coil or on transmitting coil or transmitting coil proximity introduces prison
Induction coil is superintended and directed, transmitting coil generates the emission current that induced electromotive force is proportional to transmitting coil in supervision induction coil, leads to
Cross the induced electromotive force U of measurement induction receiving coilRWith the induced electromotive force V of supervision induction coilTCalculate formation conductivity,
URAnd VTAll generated by induction coil as sensor.When circuit is realized, in addition to amplification factor has difference, it can use identical
Measuring circuit.Due to the sensor using same type, almost the same measuring circuit, to ensure that twice signal has phase
The measurement accuracy matched simplifies design of measuring system and realizes.As long as improving the precision of electro-motive force measurement module, so that it may improve
Stratum apparent conductivity σaMeasurement accuracy.
It is switched by two-way switching and introduces " ratio of gains " measurement pattern and " signal ratio " measurement pattern, realized by two kinds of moulds
The ratio of relative measurement under formula determines stratum apparent conductivity, to increase substantially the interference free performance of measuring system.
Switch switch by three-dimensional and introduce zero bias measurement, forms " zero bias ", " ratio of gains " and " signal ratio " measurement pattern
Alternately, it rejects zero bias, inhibits temperature drift, stratum apparent conductivity is determined using the ratio of relative measurement, it is ensured that the stabilization of measurement
Reliably.
Detailed description of the invention
Fig. 1 is the circuit diagram of existing conductivity measurement instrument；
Fig. 2 is the circuit diagram of conductivity measurement instrument described in embodiment 1；
Fig. 3 is schematic diagram when conductivity measurement instrument described in embodiment 2 is in different measurement patterns, and 3a is in gain
Schematic diagram when than measurement pattern, schematic diagram when 3b is in signal than measurement pattern；
Fig. 4 is the flow chart of conductivity measuring method described in embodiment 2；
Fig. 5 is schematic diagram when conductivity measurement instrument described in embodiment 3 is in different measurement patterns, and 5a is zero bias measurement
Schematic diagram when mode, schematic diagram when 5b is in ratio of gains measurement pattern, showing when 5c is in signal than measurement pattern
It is intended to；
Fig. 6 is the flow chart of conductivity measuring method described in embodiment 3；
Fig. 7 is the circuit diagram of conductivity measurement instrument described in embodiment 4；
In figure: 1, launch driving circuit, 2, transmitting coil, 3, supervision induction coil, 4, emf measuring circuit, 5, shielding
Coil, 6, receiving coil, 7, emf measuring circuit.
Specific embodiment
The present invention is further illustrated in the following with reference to the drawings and specific embodiments.
Embodiment 1
The present embodiment discloses a kind of induction logging conductivity measurement instrument, as shown in Fig. 2, including transmitting coil 2 and reception
Coil 6, transmitting coil 2 are connected with launch driving circuit 1, and receiving coil 6 is serially connected with shielded coil 5.
In this implementation, induction logging instrument does not measure emission current directly, but supervision induction is equipped in transmitting coil
Coil 3, transmitting coil 2 generate induced electromotive force, receiving coil 6 and supervision sense in receiving coil 6, supervision induction coil 3
Coil 3 is answered to be connected separately with emf measuring circuit 7 and emf measuring circuit 4.
Supervision induction coil 3 can also be arranged on transmitting coil or transmitting coil proximity, guarantees that transmitting coil 2 exists
Induced electromotive force is generated in supervision induction coil 3.
In the present embodiment, transmitting coil generates induced electromotive force V in supervision induction coilTIt is proportional to the hair of transmitting coil
Radio stream IT, enabling α is proportionality coefficient, that is, have:
VT=α IT(2),
Formula (2) are substituted into formula (1) to obtain the final product:
According to formula (3) it is found that by measurement receiving coil and supervising the induced electromotive force ratio U in induction coilR/VT
Stratum apparent conductivity just can be obtained.
According to formula (3), twice signal need only be measured, is the induced electromotive force U for incuding receiving coil respectivelyRFeel with supervision
Answer the induced electromotive force V of coilT, they are all generated by induction coil as sensor.When emf measuring circuit is realized, except putting
Big multiple has outside difference, can use identical measuring circuit.Due to the sensor using same type, almost the same measurement electricity
Road, to ensure that twice signal has the measurement accuracy to match, simplify design of measuring system and realize.As long as improving electricity
The precision of kinetic potential measurement module, so that it may improve stratum apparent conductivity σaMeasurement accuracy.
What supervision induction coil measured is the magnetic field strength that transmitting coil emits into surrounding medium, more directly measures induction
The source of phenomenon, to solve measured current strength and true emission current intensity ITBetween difference problem.
In the present embodiment, the emf measuring circuit of induction coil is supervised and emf measuring circuit that receiving coil connects
It include pre-amplification circuit, analog to digital conversion circuit, superposition de-noising circuit and digital detecting circuit, in addition to pre-amplification circuit
Amplification factor is different, other are all the same.
The present embodiment also discloses a kind of induction logging formation conductivity measurement method, and this method is based on above-mentioned stratum electricity
Conductance measuring instrument measures the induced electromotive force U of induction receiving coil using two emf measuring circuits respectivelyRFeel with supervision
Answer the induced electromotive force V of coilT, then formation conductivity is calculated according to formula (3).
Embodiment 2
The measuring circuit of induced electromotive force generally comprises preposition amplification, analog-to-digital conversion, superposition de-noising and digital detection, each
There is its respective gain in a measuring circuit channel, in logging operation, the gain in each measuring circuit channel with environment temperature change
Change and change, referred to as circuit temperature drift.How to control or reduce circuit temperature drift becomes the difficult point of Instrument Circuit Designing.
In order to control and reduce circuit temperature drift, the anti-interference of emf measuring circuit is improved, the present embodiment is in embodiment 1
Increase a two-way switching switch on the basis of the formation conductivity measuring instrument, two-way switching switch is set to receiving coil
Between 6 emf measuring circuits 7 connected to it, the contact 1 of two-way switching switch is connected with supervision induction coil, contact 2 and
Receiving coil is connected.Two-way switching switch can be connected to contact 1 or contact 2 respectively, when being connected to contact 1, as shown in Figure 3a,
The input of the emf measuring circuit of supervision induction coil and receiving coil is the induced electromotive force V for supervising induction coilT；When
When being connected to contact 2, if shown in 3b, the input of supervision induction coil emf measuring circuit is the induced electricity for supervising induction coil
Kinetic potential VT, the input of receiving coil emf measuring circuit is the induced electromotive force U of receiving coilR。
U is used in Fig. 3RIndicate the induced electromotive force of receiving coil, the gain G of corresponding emf measuring circuitUIt indicates；Prison
Superintend and direct the induced electromotive force V of induction coilTIt indicates, the gain G of corresponding emf measuring circuitVIt indicates.Note that U hereR、
VT、GUAnd GVIt is all plural number.Launch driving circuit used is same as the prior art, does not illustrate and in figure.
As shown in Figure 3a, when two-way switching switchs access contact 1, the input of two emf measuring circuits is identical, this
When, u is used in the output of two circuits respectively1And v1It indicates, then
Circuit gain ratio is obtained at this time,
This measuring process is known as " ratio of gains " measurement pattern.
As shown in Figure 3b, when two-way switching switchs access contact 2, the input of two emf measuring circuits is different, point
It Wei not URAnd VT, at this point, u is used in the output of two circuits respectively2And v2It indicates, then
Signal ratio is obtained at this time:
This measuring process is known as " signal ratio " measurement pattern.
In completion " ratio of gains " measurement pattern " and " signal ratio " measurement pattern after, the measurement result of two steps is combined
Calculate stratum apparent conductivity σa.(5) formula is substituted into (7) formula to get arriving:
(8) formula is substituted into (3) formula to get arriving:
A kind of feeling well logging conductivity measuring method is also disclosed in the present embodiment, and this method is based on measuring instrument described in embodiment 2
Device controls two-way switching switch intermittently make contact 1 and contact 2, realizes gain as shown in figure 4, being the flow chart of this method
Than measurement pattern and signal than the alternating of measurement pattern, the output of two kinds of measurement patterns is recorded, stratum is then calculated according to formula 9
Conductivity.In the present embodiment, the alternating ratio of two kinds of measurement patterns is it can be selected that such as 1:16, i.e., 1 ratio of gains measures: 16 times
Signal is than measurement.
The present embodiment, which is realized, determines stratum apparent conductivity by the relative measurement under both of which.Using identical electronics member
The temperature drift trend of device, two measuring circuit channels is essentially identical, the ratio of gains in two channels within a lesser period
Significant changes do not occur, are further ensured that the measurement accuracy of stratum apparent conductivity.
Embodiment 3
In order to further control and reduce circuit temperature drift, the present embodiment introduces zero bias measurement, i.e., supervision induction coil with
A three-dimensional is equipped between its emf measuring circuit connected, between receiving coil emf measuring circuit connected to it
Switching switch, the short circuit or ground connection of contact 0 of two three-dimensionals switching switch, the contact 1 of two three-dimensionals switching switches with prison
It superintends and directs induction coil to be connected, the contact 2 of two three-dimensional switching switches is connected with supervision induction coil, receiving coil respectively.Work as three-dimensional
When switching switch is connected to contact 0, the input of corresponding emf measuring circuit is 0, when three-dimensional switching switch is connected to contact 1
When, the input of corresponding emf measuring circuit is the induced electromotive force V for supervising induction coilT, when three-dimensional switching switch connects
When contact 2, the input of corresponding emf measuring circuit is the induced electromotive force U of receiving coilR。
U is used in Fig. 5RIndicate the induced electromotive force of receiving coil, the gain G of corresponding emf measuring circuitUIt indicates；Prison
Superintend and direct the induced electromotive force V of induction coilTIt indicates, the gain G of corresponding emf measuring circuitVIt indicates.Note that U hereR、
VT、GUAnd GVIt is all plural number.Launch driving circuit used is same as the prior art, does not illustrate and in figure.
As shown in Figure 5 a, when three-dimensional switches switch access contact 0, the input signal of twice measuring circuit is all 0, is measured
The zero bias value of twice measuring circuit is u0And v0, this measuring process is known as zero bias measurement pattern；
As shown in Figure 5 b, when three-dimensional switches switch access contact 1, the input signal of twice measuring circuit is all VT, this
When, u is used in the output of two circuits respectively1And v1It indicates, then
This measuring process is known as " ratio of gains " measurement pattern.
As shown in Figure 5 c, when three-dimensional switches switch access contact 2, the input signal of twice measuring circuit is respectively URWith
VT, at this point, u is used in the output of two circuits respectively2And v2It indicates, then
This measuring process is known as " signal ratio " measurement pattern.
(1) formula obtains the ratio of gains, in conjunction with (2) formula, obtains signal ratio
Apparent conductivity determines by following formula,
A kind of feeling well logging conductivity measuring method is also disclosed in the present embodiment, and this method is based on measuring instrument described in embodiment 3
Device, as shown in fig. 6, being the flow chart of this method, intermittently make contact 0,1,2, realization zero bias increase control three-dimensional switching switch
Benefit ratio, signal record the output of three kinds of measurement patterns, then calculate stratum conductance according to formula than the alternating of three kinds of measurement patterns
Rate.In the present embodiment, the alternating ratio of three kinds of measurement patterns is it can be selected that such as
Zero bias: the ratio of gains: signal ratio: zero bias ...=1:1:16:1 ...,
Or it is more more complicated, such as:
Zero bias: signal ratio: the ratio of gains: signal ratio: zero bias ...=1:10:1:10:1 ...,
The selection of this alternating ratio can select according to the actual situation, and the present embodiment is without exhaustion.
Embodiment 4
In the present embodiment, induction logging formation conductivity measuring instrument described in embodiment 3 is used for the battle array of more receiving coils
Column type instrument, is just provided with multiple receiving coils, and each receiving coil switches switch by three-dimensional and connects a conductivity survey
Circuit is measured, other are identical with embodiment 3.
An attenuator circuit is introduced in transmitting supervisory signals measuring circuit, attenuator circuit is to be serially connected in pre-amplification circuit
Two divider resistances between analog to digital conversion circuit, the voltage Δ V1 and resistance and modulus detected between two resistance respectively turn
Change the voltage Δ V2 between circuit, attenuation coefficientATT emits the signal and subarray of supervision less than 1 after decaying
Reception signal magnitude it is close, at this moment, formula (10) becomes following form:
Formation conductivity is calculated by formula 11.
Described above is only basic principle and preferred embodiment of the invention, and those skilled in the art do according to the present invention
Improvement and replacement out, belong to the scope of protection of the present invention.
Claims (9)
1. induction logging formation conductivity measuring instrument, including transmitting coil and receiving coil, transmitting coil is connected with transmitting and drives
Dynamic circuit, it is characterised in that: in transmitting coil or on transmitting coil or any position of transmitting coil proximity is equipped with supervision
Induction coil, transmitting coil generate induced electromotive force, receiving coil and supervision induction in receiving coil, supervision induction coil
Coil is respectively connected with emf measuring circuit.
2. induction logging formation conductivity measuring instrument according to claim 1, it is characterised in that: receiving coil connects with it
Two-way switching is equipped between the emf measuring circuit connect to switch, the contact 1 of two-way switching switch is connected with supervision induction coil,
Contact 2 is connected with receiving coil.
3. induction logging formation conductivity measuring instrument according to claim 1, it is characterised in that: supervision induction coil with
A three-dimensional is equipped between its emf measuring circuit connected, between receiving coil emf measuring circuit connected to it
Switching switch, the short circuit or ground connection of contact 0 of two three-dimensionals switching switch, the contact 1 of two three-dimensionals switching switches with prison
It superintends and directs induction coil to be connected, the contact 2 of two three-dimensional switching switches is connected with supervision induction coil, receiving coil respectively.
4. induction logging formation conductivity measuring instrument according to claim 1-3, it is characterised in that: receive line
The quantity of circle is N number of, N >=1, and each receiving coil is respectively connected with an emf measuring circuit.
5. induction logging formation conductivity measuring instrument according to claim 1-3, it is characterised in that: supervision sense
The emf measuring circuit for answering coil to connect with receiving coil includes pre-amplification circuit, analog to digital conversion circuit, superposition de-noising
Circuit and digital detecting circuit.
6. induction logging formation conductivity measurement method, it is characterised in that: the following steps are included: S01), construction conductivity measurement
Circuit, the electrical conductivity measurement circuit include transmitting coil and receiving coil, and transmitting coil is connected with launch driving circuit, are being sent out
In ray circle or on transmitting coil or any position of transmitting coil proximity is equipped with supervision induction coil, and transmitting coil is receiving
Induced electromotive force is generated in coil, supervision induction coil, receiving coil and supervision induction coil are respectively connected with electro-motive force measurement
Circuit；S02), the induced electromotive force V of supervision induction coil is measured using emf measuring circuitTWith the induced electricity of receiving coil
Kinetic potential UR, according to formulaCalculate formation conductivity, σaFor measured formation conductivity；K is instrument
Constant is defined as under unity emitter current excitation, instrument generated secondary induced electricity in the uniform stratum of Their unit conductance rate
Kinetic potential intensity；α is the ratio of the emission current of induced electromotive force and transmitting coil that transmitting coil generates in supervision induction coil
Example coefficient.
7. induction logging formation conductivity measurement method according to claim 6, it is characterised in that: to conductivity measurement electricity
Road is handled, and increases two-way switching switch between receiving coil emf measuring circuit connected to it, and two-way switching is opened
The contact 1 of pass is connected with supervision induction coil, and contact 2 is connected with receiving coil, controls two-way switching switch according to certain time
Number ratio is connect with contact 1,2 respectively, then according to formulaCalculate formation conductivity, u1And v1
When indicating two-way switching switch connection contact 1, the sense of receiving coil and supervision induction coil that emf measuring circuit detects
Answer electromotive force, u2And v2When indicating two-way switching switch connection contact 2, receiving coil and prison that emf measuring circuit detects
Superintend and direct the induced electromotive force of induction coil.
8. induction logging formation conductivity measurement method according to claim 6, it is characterised in that: to conductivity measurement electricity
Road is handled, supervision induction coil emf measuring circuit connected to it between, receiving coil it is connected to it electronic
Increase a three-dimensional switching switch between gesture measuring circuit, the equal short circuit in contact 0 or ground connection that two three-dimensional switchings switch, two
The contact 1 of a three-dimensional switching switch is connected with supervision induction coil, and the contact 2 of two three-dimensional switching switches is felt with supervision respectively
Coil, receiving coil is answered to be connected, control three-dimensional switching switch is connect with contact 0,1,2 respectively according to certain number ratio, so
Afterwards according to formulaCalculate formation conductivity, u0And v0Indicate three-dimensional switching
When switch connection contact 0, the induced electromotive force of receiving coil and supervision induction coil that emf measuring circuit detects, u1With
v1When indicating three-dimensional switching switch connection contact 1, receiving coil and supervise induction coil that emf measuring circuit detects
Induced electromotive force, u2And v2When indicating three-dimensional switching switch connection contact 2, receiving coil that emf measuring circuit detects with
Supervise the induced electromotive force of induction coil.
9. induction logging formation conductivity measurement method according to claim 8, it is characterised in that: introduce a decaying electricity
Road, attenuation coefficient ATT, ATT are less than 1, at this time according to formula
Calculate formation conductivity.
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