CN102606138A - Method for correcting dielectric constant of electromagnetic wave resistivity logger while drilling by means of phase-amplitude method - Google Patents

Method for correcting dielectric constant of electromagnetic wave resistivity logger while drilling by means of phase-amplitude method Download PDF

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CN102606138A
CN102606138A CN2012100950575A CN201210095057A CN102606138A CN 102606138 A CN102606138 A CN 102606138A CN 2012100950575 A CN2012100950575 A CN 2012100950575A CN 201210095057 A CN201210095057 A CN 201210095057A CN 102606138 A CN102606138 A CN 102606138A
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dielectric constant
resistivity
amplitude
response
phase difference
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CN102606138B (en
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宋殿光
段宝良
方辉
魏少华
郭巍
李郴
韩宏克
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China Research Institute of Radio Wave Propagation CRIRP
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Abstract

The invention relates to a method for correcting a dielectric constant of an electromagnetic wave resistivity logger while drilling by means of a phase-amplitude method, which includes the steps: firstly, regarding resistivity and the dielectric constant as two mutually independent variables during computation of response of the electromagnetic wave resistivity logger while drilling; secondly, computing the response of the phase difference and the amplitude ratio of the electromagnetic wave resistivity logger while drilling with given frequency and spacing in a resistivity homogeneous isotropic medium; thirdly, respectively varying the dielectric constant and the resistivity from small to big while the response is computed, and obtaining a group of response values of the phase difference and the amplitude ratio; and finally, according to the response values of the phase difference and the amplitude ratio and the corresponding relation between the dielectric constant and the resistivity, taking the response values of the phase difference and the amplitude ratio as values of a horizontal coordinate and a vertical coordinate of a coordinate system respectively, drawing a chart, obtaining a dielectric constant and a resistivity value in correspondence in a group by means of interpolating in the chart, or making computed data into a database after obtaining the response values of the phase difference and the amplitude ratio, so that the dielectric constant and the resistivity value are obtained by searching in the database, and the dielectric constant is corrected.

Description

With boring the bearing calibration of electromagnetic resistivity logging instrument phase amplitude dielectric constant
Technical field
The present invention relates to a kind of dielectric constant bearing calibration, particularly relate to a kind of phase amplitude method of utilizing carrying out method of correcting with boring electromagnetic resistivity logging instrument dielectric constant.
Background technology
Along with the demand of land horizontal well and increase of high angle hole drilling effort and offshore drilling, the normal cable well logging can not have been satisfied the needs of logging technique, so logging while drilling technology has obtained very fast development.It can be realized drilling well and log well and carry out simultaneously; Be that logger is installed in the position near drill bit; Do not receive on the stratum measure under the condition of obvious intrusion and pollution and the traditional cable log facies relatively, have that real-time is good, the logging accuracy advantages of higher.With boring the electromagnetic resistivity logger is one of instrument the most frequently used in the well logging during; It mainly measures the resistivity information on stratum; Because the resistivity of oil reservoir is higher generally speaking; Therefore it can the effective recognition oil reservoir, and also has and can instruct the drill bit geosteering function that level is crept in oil reservoir.The response of this instrument in the stratum not only receives the influence of resistivity; Also receive the influence of dielectric constant, when low or stratum was low-resistance in the instrument operating frequency, the response of instrument mainly received the influence of resistivity; It is very little influenced by dielectric constant; Yet dielectric constant increases the influence of electromagnetic wave propagation under high frequency or high resistant strata condition, and therefore, resistivity information need carry out the dielectric constant correction to the apparent resistivity that logging while drilling apparatus records in order to obtain accurately.The experience updating formula is adopted in traditional dielectric constant bearing calibration usually, is through the dielectric constant and the conductivity data of oil-producing well saturation water lithology sample all over the world being carried out mapping analysis, finding out the corresponding relation between dielectric constant and the electrical conductivity.And necessary relation not between dielectric constant and the resistivity in fact, clearly this relational expression is a kind of approximate, exists certain error with actual conditions.This error can influence the measurement category and the certainty of measurement of logger.Therefore we have invented and have a kind ofly regarded dielectric constant and resistivity as two independent variables and carry out method of correcting, have effectively removed the influence of dielectric constant, have improved the measurement category and the certainty of measurement index of instrument.
Summary of the invention
The present invention is directed to the prior art deficiency,, propose a kind ofly, can improve the measurement category and the certainty of measurement index of instrument with boring the bearing calibration of electromagnetic resistivity logging instrument phase amplitude dielectric constant in order to reduce the influence of dielectric constant to log response.
The technical scheme that the present invention adopted:
It is a kind of with the bearing calibration of brill electromagnetic resistivity logging instrument phase amplitude dielectric constant,
1), calculating with boring in the response of electromagnetic resistivity logging instrument, regard resistivity and dielectric constant as separate two variablees,
2), in the uniform resistivity isotropic medium calculated for given frequency and spacing with the phase difference that bores the electromagnetic resistivity logging instrument and amplitude than response,
3), dielectric constant and resistivity are changed by from small to large order respectively during calculated response, the excursion of dielectric constant from 1.0 to 300, the excursion of resistivity from 0.1Ohmm to 10000Ohmm,
4), through top computational process; Under every class frequency and spacing combination; The capital draws one group of phase difference and amplitude compares response; These two responses and dielectric constant and resistivity exist one-to-one relationship, i.e. the corresponding a certain frequency source that each dielectric constant and resistivity combination all can be unique compares response apart from a phase difference response and the amplitude under the combination
5), according to phase difference and amplitude than response and dielectric constant and resistivity corresponding relation; Get phase difference and amplitude than response respectively as the value of coordinate system abscissa and ordinate; Draw plate; Then each dielectric constant and resistivity value all can be confirmed with a unique point in this coordinate system, obtain one group of corresponding dielectric constant and resistivity value through in plate, carrying out interpolation.
Described with boring the bearing calibration of electromagnetic resistivity logging instrument phase amplitude dielectric constant; Obtain phase difference and amplitude than response after; Except obtain corresponding dielectric constant and resistivity value through interpolation on chart board; Can also make database with calculating good data before; Obtain dielectric constant and resistivity value through search in database, the making of database is that phase difference and amplitude under a certain frequency that calculates under each dielectric constant and the resistivity value and the spacing combination are formed one group of data than response data by corresponding relation, and promptly (dielectric constant values, resistivity value, phase difference response, amplitude are than response) is as one group of data; In given dielectric constant and resistivity range of variation, can obtain the such data of many groups, arrange in sequence and just obtain database organize such data more.
Described with boring the bearing calibration of electromagnetic resistivity logging instrument phase amplitude dielectric constant; In the search; Phase difference of selecting to obtain under same frequency and the spacing and amplitude are input in the corresponding database as search condition than response and search for; After finding the one group of data that is complementary with search condition, just can read the value of this group data medium dielectric constant microwave medium and resistivity, accomplish search.Obtain and the irrelevant resistivity value of dielectric constant, realize the correction of dielectric constant.
Beneficial effect of the present invention:
1, the present invention is with boring the bearing calibration of electromagnetic resistivity logging instrument phase amplitude dielectric constant; Dielectric constant bearing calibration traditional is with it compared; Guaranteeing resolution ratio, investigation depth and receiving to effectively raise the measurement category and the precision index of instrument under the identical situation of anisotropy influence degree, making the apparent resistivity measurement category rise to becomes possibility more than the 3000Ohmm; Enlarge the range of application of this instrument, avoided instrument failure phenomenon under the high resistant stratum to a certain extent.
2, the present invention is with boring the bearing calibration of electromagnetic resistivity logging instrument phase amplitude dielectric constant; Can under the high resistant stratum, obtain than traditional dielectric constant bearing calibration apparent resistivity value more accurately; When log data being carried out the integrated treatment explanation; The process of removing influences such as well, intrusion, country rock can be more accurate, makes the undisturbed formation resistivity that obtains approach actual value more than traditional dielectric constant bearing calibration, and then obtain formation information more accurately; Make things convenient for the oilfield technology personnel that oil and gas reservoir is made energy storage evaluation more accurately and production program, promoted the using value of instrument in evaluating reservoir.
3, the present invention is with boring the bearing calibration of electromagnetic resistivity logging instrument phase amplitude dielectric constant; Abandoned there is contact in traditional thinking between dielectric constant and the resistivity dielectric constant correction thought; Regarding independently both as variable proofreaies and correct; This thought has played a reference function for dielectric constant bearing calibration from now on, is a developing direction of dielectric constant bearing calibration from now on.
Description of drawings
Fig. 1 a is with boring electromagnetic resistivity logging instrument phase amplitude dielectric constant correcting plate (f=2MHz, spacing are 20in);
Fig. 1 b is with boring electromagnetic resistivity logging instrument phase amplitude dielectric constant correcting plate (f=400kHz, spacing are 20in);
Fig. 2 a, model 1 phase difference apparent resistivity curve;
Fig. 2 b, model 1 amplitude compares apparent resistivity;
Fig. 2 c, model 1 phase amplitude method apparent resistivity;
Fig. 2 d, model 1 phase amplitude method is looked dielectric constant;
Fig. 3 a, the phase difference apparent resistivity curve that model 2 is traditional;
Fig. 3 b, model 2 traditional amplitudes compare apparent resistivity curve;
Fig. 3 c, the apparent resistivity curve that model 2 phase amplitude methods obtain;
Fig. 3 d, model 2 phase amplitude methods obtain looks the dielectric constant curve;
Fig. 4 a, the phase difference apparent resistivity curve that model 3 is traditional;
Fig. 4 b, model 3 traditional amplitudes compare apparent resistivity curve;
Fig. 4 c, the apparent resistivity curve that model 3 phase amplitude methods obtain;
Fig. 5 a, the phase difference apparent resistivity curve that model 4 is traditional;
Fig. 5 b, model 4 traditional amplitudes compare apparent resistivity curve;
Fig. 5 c, the apparent resistivity curve that model 4 phase amplitude methods obtain;
Fig. 6 a, the phase difference apparent resistivity curve that model 5 is traditional;
Fig. 6 b, model 5 traditional amplitudes compare apparent resistivity curve;
Fig. 6 c, the apparent resistivity curve that model 5 phase amplitude methods obtain.
The specific embodiment
Embodiment one: the present invention is with boring the bearing calibration of electromagnetic resistivity logging instrument phase amplitude dielectric constant, and implementation step is following:
1) calculating, regards resistivity and dielectric constant as separate two variablees, do not have any relation between the two with boring in the response of electromagnetic resistivity logging instrument;
2) in the uniform resistivity isotropic medium calculated for given frequency and spacing with the phase difference that bores the electromagnetic resistivity logging instrument and amplitude than responding,
3), dielectric constant and resistivity are changed by from small to large order respectively during calculated response; The excursion of dielectric constant from 1.0 to 300; The excursion of resistivity is from 0.1Ohmm to 10000Ohmm; Under every class frequency and spacing combination, draw one group of phase difference and amplitude and compare response
4) according to phase difference and amplitude than response and dielectric constant and resistivity corresponding relation; Get phase difference and amplitude than response respectively as the value of coordinate system abscissa and ordinate; Draw plate; Then each dielectric constant and resistivity value all can be confirmed with a unique point in this coordinate system, obtain one group of corresponding dielectric constant and resistivity value through in plate, carrying out interpolation then, realize the correction of dielectric constant.
We can both obtain a phase difference and an amplitude compares response under each frequency and spacing make up in reality well logging; These two responses and dielectric constant and resistivity exist one-to-one relationship, i.e. the corresponding a certain frequency source that each dielectric constant and resistivity combination all can be unique compares response apart from a phase difference response and the amplitude under the combination.Owing to exist this corresponding relation, we get phase difference and amplitude than response respectively as the value of coordinate system abscissa and ordinate, then each dielectric constant and resistivity value all can be confirmed with a unique point in this coordinate system.We are 2MHz and 400kHz with the frequency; Spacing is that 20in is that example has been calculated one group of phase difference and amplitude compares response data; And it is as shown in Figure 1 to have drawn plate, and we just can carry out dielectric constant and resistivity value that interpolation obtains one group of correspondence in plate like this.At this moment resistivity value and dielectric constant values are separate, have realized the correction of dielectric constant.
Embodiment two: referring to Fig. 1, present embodiment is with boring the bearing calibration of electromagnetic resistivity logging instrument phase amplitude dielectric constant, and the scheme step that it adopts is following:
1) just drilling in the calculating, regarding resistivity and dielectric constant as separate two variablees,
2) in the uniform resistivity isotropic medium calculated for given frequency and spacing with the phase difference that bores the electromagnetic resistivity logging instrument and amplitude than responding,
3) dielectric constant and resistivity are changed by from small to large order respectively during calculated response; The excursion of dielectric constant from 1.0 to 300, the excursion of resistivity are from 0.1Ohmm to 10000Ohmm, under every class frequency and spacing combination; Draw a phase difference and amplitude and compare response
What present embodiment and embodiment one were different is; Obtain phase difference and amplitude than response after; Except obtain corresponding dielectric constant and resistivity value through interpolation on chart board; Can also make database with calculating good data before; Obtain dielectric constant and resistivity value through search in database, wherein the making of database is that phase difference and amplitude under a certain frequency that calculates under each dielectric constant and the resistivity value and the spacing combination are formed one group of data than response data by corresponding relation, and promptly (dielectric constant values, resistivity value, phase difference response, amplitude are than response) is as one group of data.In given dielectric constant and resistivity range of variation, can obtain the such data of many groups like this.Arrange in sequence and just obtain our said database organize such data more.
In the search; Phase difference of selecting to obtain under same frequency and the spacing and amplitude are input in the corresponding database as search condition than response and search for; After finding the one group of data that is complementary with search condition, just can read the value of this group data medium dielectric constant microwave medium and resistivity, accomplish search.Obtain and the irrelevant resistivity value of dielectric constant, realize the correction of dielectric constant.
Dielectric constant bearing calibration of the present invention, the curve characteristic analysis is following:
1, resolution character analysis
Model 1 is the target zone that in the country rock of 10Ohmm, clips 100Ohmm, and the purpose bed thickness is respectively 2ft, 4ft, 8ft, 16ft, and middle country rock bed thickness is 10ft; Dielectric constant is all elected the empirical formula of Schlumberger company as; Under the frequency 2MHz, under the frequency 400KHZ, hole deviation is 0 °.With boring traditional phase difference and the amplitude of electromagnetic resistivity logging instrument under this model than apparent resistivity curve such as Fig. 2 a, shown in the 2b, utilize apparent resistivity curve that the phase amplitude method of this paper is converted to shown in Fig. 2 c, look dielectric constant shown in Fig. 2 d.Through observing each graph discovery of model 1 apparent resistivity curve among Fig. 2, the longitudinal frame of apparent resistivity curve that the phase amplitude method obtains and traditional phase difference apparent resistivity curve is suitable.Look the dielectric constant curve owing to the influence that receives country rock is serious, lost meaning basically.
Model 2 is identical with the formation thickness and the shoulder-bed resistivity (SBR) of model 1, and just target zone is an anisotropy, and horizontal resistivity is 10Ohmm, and vertical resistivity is 100Ohmm, and hole deviation is 80 °, and dielectric constant is elected the empirical formula of Schlumberger company equally as.Traditional apparent resistivity curve of logging while drilling apparatus such as Fig. 3 a under this model shown in the 3b, utilize apparent resistivity curve that the phase amplitude method of this paper is converted to shown in Fig. 3 c, look dielectric constant shown in Fig. 3 d.Observe each graph discovery among Fig. 3, the apparent resistivity curve that the phase amplitude method obtains all has identical form and longitudinal frame with traditional phase difference apparent resistivity curve, explains that it receives anisotropic influence degree identical with the phase difference apparent resistivity curve.It still is nonsensical looking the dielectric constant curve, therefore will no longer analyze it in the example below.
2, intrusion effect analysis
Model 3 is the target zone that clips three layers of 100Ohmm in the country rock of 10Ohmm equally, and hole deviation is 0 °, but exists intrusion in the target zone; Invade resistivity and be 10Ohmm; Invasion diameter is respectively 10in, 20in, 30in, and the purpose bed thickness is 20ft, and middle country rock bed thickness is 10ft.Dielectric constant is elected the empirical formula of Schlumberger company equally as.Traditional apparent resistivity curve of logging while drilling apparatus such as Fig. 4 a under this model; Shown in the 4b; Utilize apparent resistivity curve that the phase amplitude method of this paper is converted to shown in Fig. 4 c; Observe each graph discovery among Fig. 4, the apparent resistivity curve that the phase amplitude method obtains is identical with traditional phase difference apparent resistivity curve, explains that the influence degree of being invaded is suitable.
3, effect analysis
Model 4 is three layers of medium, and shoulder-bed resistivity (SBR) is 10Ohmm, and target zone resistivity is 1000Ohmm; Bed thickness is 30m, and dielectric constant all elects 30 as, and hole deviation is 0 °; Traditional apparent resistivity curve of logging while drilling apparatus such as Fig. 5 a under this model shown in the 5b, observe this two graph discoveries; Because target zone is thicker; Basically do not receive shoulder effect, but frequency be three phase difference apparent resistivity curve values of 2MHz much smaller than 1000Ohmm, this mainly is the influence that receives dielectric constant; Well overlap and frequency is three phase difference apparent resistivity curve values of 400KHz, explained that the phase difference apparent resistivity that this model lower frequency is 400KHz receives the influence of dielectric constant very little with undisturbed formation.Amplitude than apparent resistivity curve owing to receive the influence of dielectric constant more greatly to lose using value basically.Utilize apparent resistivity curve that the phase amplitude method is converted to shown in Fig. 5 c, observe six curves of this graph discovery and all well overlap, successfully overcome the error that produces by the dielectric constant influence with undisturbed formation.
Model 5 still is three layers of stratum, and shoulder-bed resistivity (SBR) is 10Ohmm, and dielectric constant is 20, and target zone resistivity is 6000Ohmm, and dielectric constant is 60, and bed thickness is 20m, and hole deviation is 0 °.Traditional apparent resistivity curve of logging while drilling apparatus such as Fig. 6 a under this model shown in the 6b, observe this two graph discoveries; Because target zone is thicker; Receive the influence of country rock less, but frequency be three phase difference apparent resistivity curve values of 2MHz less than 1000Ohmm, departed from actual value far away.This explains that it receives the influence of dielectric constant very big.Frequency is that three phase difference apparent resistivity curve values of 400KHz will be higher than the curve that frequency is 2MHz, but makes it still less than actual value owing to exceeded the interpolation scope of plate.Amplitude loses using value than apparent resistivity curve owing to receive the influence of dielectric constant more greatly to be far smaller than actual value.Utilize apparent resistivity curve that the phase amplitude method is converted to shown in Fig. 6 c; Three apparent resistivity curves and the actual value of observing this graph discovery frequency and be 400KHz can well coincide; Though frequency is irregular on three curve forms of 2MHz; But the influence of having removed dielectric constant to a certain extent risen to apparent resistivity value more than the 3000Ohmm, widened the measurement category of apparent resistivity greatly.

Claims (2)

1. one kind with boring the bearing calibration of electromagnetic resistivity logging instrument phase amplitude dielectric constant, it is characterized in that:
1) calculating, regards resistivity and dielectric constant as separate two variablees with boring in the response of electromagnetic resistivity logging instrument;
2) in the uniform resistivity isotropic medium calculated for given frequency and spacing with the phase difference that bores the electromagnetic resistivity logging instrument and amplitude than responding;
3), dielectric constant and resistivity are changed by from small to large order respectively during calculated response; The excursion of dielectric constant from 1.0 to 300; The excursion of resistivity is from 0.1Ohmm to 10000Ohmm; Under every class frequency and spacing combination, draw one group of phase difference and amplitude and compare response;
4) according to phase difference and amplitude than response and dielectric constant and resistivity corresponding relation; Get phase difference and amplitude than response respectively as the value of coordinate system abscissa and ordinate; Draw plate; Then each dielectric constant and resistivity value all can be confirmed with a unique point in this coordinate system, obtain one group of corresponding dielectric constant and resistivity value through in plate, carrying out interpolation then, realize the correction of dielectric constant.
2. one kind with boring the bearing calibration of electromagnetic resistivity logging instrument phase amplitude dielectric constant, it is characterized in that:
1) calculating, regards resistivity and dielectric constant as separate two variablees with boring in the response of electromagnetic resistivity logging instrument;
2) in the uniform resistivity isotropic medium calculated for given frequency and spacing with the phase difference that bores the electromagnetic resistivity logging instrument and amplitude than responding;
3) dielectric constant and resistivity are changed by from small to large order respectively during calculated response; The excursion of dielectric constant from 1.0 to 300; The excursion of resistivity under every class frequency and spacing combination, draws a phase difference and amplitude and compares response from 0.1Ohmm to 10000Ohmm;
4) phase difference and amplitude under a certain frequency that calculates under each dielectric constant and the resistivity value and the spacing combination are formed one group of data than response data by corresponding relation; In given dielectric constant and resistivity range of variation, can obtain the such data of many groups, arrange in sequence and just obtain database organize such data more;
5) obtain phase difference and amplitude than response after; Make database with calculating good data before; Phase difference of selecting to obtain under same frequency and the spacing and amplitude are input in the corresponding database as search condition than response and search for, and find the one group of data that is complementary with search condition, read the value of this group data medium dielectric constant microwave medium and resistivity; Draw and the irrelevant resistivity value of dielectric constant, realize the correction of dielectric constant.
CN201210095057.5A 2012-03-31 2012-03-31 Method for correcting dielectric constant of electromagnetic wave resistivity logger while drilling by means of phase-amplitude method Expired - Fee Related CN102606138B (en)

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CN103015995A (en) * 2012-12-14 2013-04-03 中国电子科技集团公司第二十二研究所 Method and device for measuring stratigraphic dip by resistivity device with tilt coil
CN104408228A (en) * 2014-10-29 2015-03-11 杭州迅美科技有限公司 Method for extracting stratum permittivity
CN107035364A (en) * 2016-02-04 2017-08-11 中石化石油工程技术服务有限公司 Electromagnetism scale method between a kind of well
CN108019206A (en) * 2017-11-16 2018-05-11 中国石油集团长城钻探工程有限公司 With brill electromagnetic wave resistivity instrument Range Extension method under a kind of high-k
CN109915120A (en) * 2019-04-16 2019-06-21 北京恒泰万博石油技术股份有限公司 A kind of resistivity logging while drilling logging system bearing calibration based on environmental factor
CN113204056A (en) * 2021-05-06 2021-08-03 中煤科工集团西安研究院有限公司 Inversion method for determining coal rock interface profile distribution position
CN113803060A (en) * 2020-06-01 2021-12-17 中石化石油工程技术服务有限公司 Correction method and device for electromagnetic wave resistivity conversion curve scale while drilling
CN117967288A (en) * 2024-04-01 2024-05-03 上海达坦能源科技股份有限公司四川分公司 Underground pressure monitoring system and method for oil and gas field

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
CN103015995A (en) * 2012-12-14 2013-04-03 中国电子科技集团公司第二十二研究所 Method and device for measuring stratigraphic dip by resistivity device with tilt coil
CN103015995B (en) * 2012-12-14 2015-06-24 中国电子科技集团公司第二十二研究所 Method and device for measuring stratigraphic dip by resistivity device with tilt coil
CN104408228A (en) * 2014-10-29 2015-03-11 杭州迅美科技有限公司 Method for extracting stratum permittivity
CN107035364A (en) * 2016-02-04 2017-08-11 中石化石油工程技术服务有限公司 Electromagnetism scale method between a kind of well
CN107035364B (en) * 2016-02-04 2021-09-14 中石化石油工程技术服务有限公司 Method for electromagnetic calibration between wells
CN108019206A (en) * 2017-11-16 2018-05-11 中国石油集团长城钻探工程有限公司 With brill electromagnetic wave resistivity instrument Range Extension method under a kind of high-k
CN108019206B (en) * 2017-11-16 2018-10-12 中国石油集团长城钻探工程有限公司 With boring electromagnetic wave resistivity instrument Range Extension method under a kind of high-k
CN109915120A (en) * 2019-04-16 2019-06-21 北京恒泰万博石油技术股份有限公司 A kind of resistivity logging while drilling logging system bearing calibration based on environmental factor
CN113803060A (en) * 2020-06-01 2021-12-17 中石化石油工程技术服务有限公司 Correction method and device for electromagnetic wave resistivity conversion curve scale while drilling
CN113204056A (en) * 2021-05-06 2021-08-03 中煤科工集团西安研究院有限公司 Inversion method for determining coal rock interface profile distribution position
CN117967288A (en) * 2024-04-01 2024-05-03 上海达坦能源科技股份有限公司四川分公司 Underground pressure monitoring system and method for oil and gas field

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