CN105370273B - A kind of method of carbon/oxygen log environmental impact factor correction - Google Patents
A kind of method of carbon/oxygen log environmental impact factor correction Download PDFInfo
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- CN105370273B CN105370273B CN201510905675.5A CN201510905675A CN105370273B CN 105370273 B CN105370273 B CN 105370273B CN 201510905675 A CN201510905675 A CN 201510905675A CN 105370273 B CN105370273 B CN 105370273B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000012937 correction Methods 0.000 title claims abstract description 30
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 25
- 239000001301 oxygen Substances 0.000 title claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 14
- 230000007613 environmental effect Effects 0.000 title claims abstract description 7
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 title claims abstract 3
- 239000012530 fluid Substances 0.000 claims abstract description 39
- 238000000342 Monte Carlo simulation Methods 0.000 claims abstract description 8
- 239000004568 cement Substances 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 claims description 3
- 238000007405 data analysis Methods 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims description 2
- 230000003595 spectral effect Effects 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 abstract description 3
- 238000012886 linear function Methods 0.000 abstract 1
- 238000005211 surface analysis Methods 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 3
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 description 2
- 241000720974 Protium Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- -1 sleeve pipe Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004457 water analysis Methods 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention discloses a kind of method of carbon/oxygen log environmental impact factor correction, the theory relation plate gone out using Monte Carlo simulation between influence factor and measured value, based on theoretical plate, the C/O values and the C/O values of uninfluenced layer position of affected layer position are chosen by reference lamina method, impacted C/O values and unaffected C/O values number are subjected to linear function fit using trend surface analysis approximating method, obtain the fit correlation formula of impacted C/O values and unaffected C/O values.The inventive method can fill the two influence factors to annular fluid and gravel and be corrected, the reliability of the log response value of impacted interval can be significantly improved using this method, and then the precision of C/O Log Interpretation evaluation remaining oil saturation is improved, there is stronger versatility.
Description
Technical field
The present invention relates to a kind of logging evaluation technology for improving carbon-to-oxygen ratio and calculating remaining oil saturation Explanation Accuracy, it is specifically
The bearing calibration that annular fluid and gravel filling influence during a kind of carbon/oxygen log, belongs to oil-gas exploration technical field.
Background technology
Carbon-to-oxygen ratio spectrum logging is also in carbon/oxygen log, is a kind of new pulsed neutron log method.It is main in oil
Carbon elements and protium, mainly contain oxygen element and protium in water, carbon oxygen phase in stratum can be obtained by carbon/oxygen log
To content ratio, the oil-gas Layer omitted can be found in the well for descended sleeve pipe, oil reservoir is determined in the oil well to have recovered the oil
Residual saturation etc..
, it is necessary to which logging technique personnel enter to the C/O curves of measurement during carbon/oxygen log calculates remaining oil saturation
Row influences correction, and so as to obtain the curve that can reflect stratum real information, the key of work is the school for determining influence factor
Correction method.Main influence factor includes sleeve pipe, cement sheath, annular fluid, shale content and gravel during carbon/oxygen log
Filling.Existing bearing calibration is primarily directed to these three factors of sleeve pipe, cement sheath and shale content, and these methods are main
It is to be corrected according to experiment plate.And annular fluid and gravel fill the two influence factors and corrected there is presently no corresponding
Method.
The content of the invention
In order to overcome above mentioned problem existing for prior art, the present invention provides a kind of carbon/oxygen log environmental impact factor school
Positive method, single influence factor is carried out by the method for sharp Monte Carlo simulation and carries out theoretical modeling, the correction to theorize
Plate, the relation between each influence factor and measured value is summarized, actual calibration model is then established according to reference lamina method.
Technical scheme is as follows：A kind of method of carbon/oxygen log environmental impact factor correction, including following step
Suddenly：
Step 101, log obtains and layer choosing to be corrected takes：Using conventional carbon oxygen logging method, sent out using neutron source
Project fast neutron and inelastic scattering occurs with stratum each element, stratum each element atomic nucleus discharges inelastic scattering gamma, profit
Spectrum unscrambling is carried out with the feature spectral peak of each element, extracts log；Played back according to log, find and annular fluid influence be present
The annular fluid factor correction reference lamina and gravel filling factor correction reference lamina influenceed with gravel filling, and by the two layers
The C/O logs value of position is as a variable in data analysis；
Step 102, Monte Carlo theoretical modeling：The method of sharp Monte Carlo simulation carries out theoretical mould to single influence factor
Intend, the correcting plate to theorize, analyze the relation between each influence factor and measured value；
Step 103, actual calibration model is established：Data fitting is carried out using reference lamina method, draws empirical equation COR=A
× COR+B, COR is carbon-to-oxygen ratio in formula, and A, B are correction coefficient, is determined generally according to the actual geological condition in different oil fields；
Step 104：Influence factor corrects：On the basis of step 103, the empirical equation obtained using fitting is to carbon-to-oxygen ratio
Carry out annular fluid and gravel filling is corrected, quantitative interpretation is carried out by the carbon-to-oxygen ratio value after correction.
In step 102, the influence factor includes：Sleeve pipe, cement sheath, annular fluid, shale content and gravel filling.
Further, it is the reference lamina based on step 102 selection to carry out data fitting using reference lamina method described in step 103
Carry out, wherein：
（1）The choosing method of annular fluid factor correction reference lamina：Select the water layer not influenceed by annular space, and the layer
Shale content, porosity and whether have gravel filling etc. parameter try one's best it is roughly the same with the holding of layer to be corrected, take correspondingly
The C/O values of interval are as annular space calibration mark layer characteristic；
（3）Gravel fills the choosing method of factor correction reference lamina：Select the minimum water layer of shale content, and the stratum
Shale content, porosity and whether by annular space to be influenceed these three parameters roughly the same with layer holding to be corrected, take respective layer
The C/O values of section fill calibration mark layer characteristic as gravel.
Further, the establishment step of calibration model described in step 103 specifically includes：Annular fluid and gravel are carried out to individual well
Stone fills two influence factors and analyzed, according to the form of curve, as a certain interval C/O and Si/Ca envelope of curves areas
Stepped increase is showed compared with the envelope size of adjacent layer position, then it is assumed that the layer has annular fluid influence.Select first
Taking is influenceed the C/O value X of interval by annular fluid and gravel filling, then chooses the interval not influenceed by annular fluid and gravel filling
C/O values Y.The data of selection are handled, are that ordinate establishes scatter diagram using X as abscissa, Y, by Y data and X parameter
Data relationship is established, according to analysis result, it be Y=aX+b to establish correction fitting formula, wherein, Y is the C/O values for indicating interval, nothing
Dimension；X be impacted interval C/O values, dimensionless；A is the slope of curve, and b is intercept.
Having the beneficial effect that relative to prior art of the invention：The present invention is to combine the Annular cutting to carbon/oxygen log
Body and gravel fill the two influence factors, by sharp Monte Carlo theoretical modeling, the correcting plate that theorizes, according to reference lamina
Method establishes calibration model；The inventive method can be accurately handled the well-log information influenceed by logging environment, by production
It was verified that the true formation information in C/O curves can be obtained using the inventive method, and then improve stratum remaining oil saturation
The precision of well log interpretation evaluation porosity is spent, there is stronger versatility；The present invention provides for RPM well logging influence factor corrections
Method；The inventive method can integrally lift remaining oil saturation well log interpretation ability, pull operation, instruct the economy of offshore oilfield
Efficient Development.
Brief description of the drawings
Fig. 1 is that annular fluid interval identifies schematic diagram.
Fig. 2 is influence of the annular fluid of Monte Carlo simulation to C/O values.
Fig. 3 is that the gravel of Monte Carlo simulation fills the influence to C/O values.
Fig. 4 is the annular fluid calibration model obtained in present example using data fit analysis.
Fig. 5 is that the gravel obtained in present example using data fit analysis fills calibration model.
Fig. 6 is that the annular fluid in the present invention corrects example, and wherein ALAVGCO is the C/O curves after correction, with measured value
Compared to reduction, it is consistent with plate understanding.
Fig. 7 is the gravel filling correction example in the present invention, and wherein ALAVGCO is the C/O curves after correction, with measured value
Compared to increase, it is consistent with plate understanding.
Embodiment
Carbon/oxygen log environmental impact factor bearing calibration of the present invention is made into one below in conjunction with the drawings and specific embodiments
The detailed description of step, specifically comprises the following steps：
Step 101, operated using carbon oxygen logging technology conventional method and obtain log data, according to log data, picked out
C/O and Si/Ca logs, according to the form of curve, the interval of annular fluid and gravel filling is selected, takes the two layers
The C/O curve values of section；Annular fluid interval identification schematic diagram such as Fig. 1.
Step 102, Monte Carlo theoretical modeling：The actual geology and stratum water analysis data in combining target region, establish
Model.Concrete model is as follows：Wellbore section is made up of wellbore fluid, sleeve pipe, cement sheath, and well is full of fresh water, sleeve pipe internal-and external diameter
Respectively 224.5mm and 244.5mm, oil pipe internal-and external diameter are respectively 62.0mm and 73.0mm；The thickness of cement sheath is 33.3cm, into
It is divided into CaSiO3, density 1.95g/cm3；The radial direction radius on stratum is 70cm, a height of 102cm, and fills different fluid respectively
And lithology material；Formation water salinity is 35000ppm；The distance of long short space is respectively 159.766mm and 235.966mm.Cover
Influence of the annular fluid of special Monte Carlo Simulation of Ions Inside to C/O values is as shown in Figure 2；Shadow of the gravel filling of Monte Carlo simulation to C/O values
Ring as shown in Figure 3.
Step 103, the layer to be corrected influenceed by annular space and the reference lamina not influenceed by annular space are found.
Step 104, the C/O data picked out from step 102 are fitted using data fit analysis, be fitted
The annular fluid calibration model arrived is as shown in Figure 4；It is as shown in Figure 5 to be fitted obtained gravel filling calibration model；Using fitting
The model formation come is corrected to annular fluid and gravel filling respectively.
Analyzed specifically, carrying out two influence factors of annular fluid and gravel filling to individual well, according to the shape of curve
State, when a certain interval C/O and Si/Ca envelopes of curves area show stepped increasing compared with the envelope size of adjacent layer position
Greatly, then it is assumed that the layer has annular fluid influence（Such as the red block interval in Fig. 1）.Choose and filled by annular fluid and gravel first
Filling out influences the C/O value X of interval, then chooses the C/O values Y for the interval not influenceed by annular fluid and gravel filling.To the number of selection
Be that ordinate establishes scatter diagram using X as abscissa, Y according to being handled, Y data and X parameter established into data relationship, according to point
Result is analysed, annular fluid correction fitting formula is Y=- 0.069X+1.978, gravel filling correction fitting formula Y=- 2.688X+
7.428, wherein, Y be mark interval C/O values, dimensionless；X be impacted interval C/O values, dimensionless.
The annular fluid calibration model obtained using step 104 fitting is corrected to annular fluid, as shown in fig. 6, its
Middle ALAVGCO is the C/O curves after correction, is reduced compared with measured value, is consistent with plate understanding, illustrates established straightening die
Type has good precision.
The gravel filling calibration model obtained using step 104 fitting is corrected to gravel filling, as shown in fig. 7, its
Middle ALAVGCO is the C/O curves after correction, is increased compared with measured value, is consistent with plate understanding, illustrates established straightening die
Type has good precision.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.The content that this specification is not described in detail belongs to known to professional and technical personnel in the field
Prior art.
Claims (4)
- A kind of 1. method of carbon/oxygen log environmental impact factor correction, it is characterised in that：Comprise the following steps：Step 101, log obtains and layer choosing to be corrected takes：Using conventional carbon oxygen logging method, launched using neutron source With stratum each element inelastic scattering occurs for fast neutron, and stratum each element atomic nucleus discharges inelastic scattering gamma, using each The feature spectral peak of element carries out spectrum unscrambling, extracts log；Played back according to log, find and annular fluid influence and gravel be present The annular fluid factor correction reference lamina and gravel filling factor correction reference lamina that stone filling influences, and by the two layer of position C/O logs value is as a variable in data analysis；Step 102, Monte Carlo theoretical modeling：Theoretical mould is carried out to single influence factor using the method for Monte Carlo simulation Intend, the correcting plate to theorize, analyze the relation between each influence factor and measured value；Step 103, actual calibration model is established：Data fitting is carried out using reference lamina method, draws empirical equation COR=A × COR + B, COR is carbon-to-oxygen ratio in formula, and A, B are correction coefficient, is determined according to the actual geological condition in different oil fields；Step 104：Influence factor corrects：On the basis of step 103, carbon-to-oxygen ratio is carried out using the empirical equation that fitting obtains Annular fluid and gravel filling are corrected, and quantitative interpretation is carried out by the carbon-to-oxygen ratio value after correction.
- 2. method according to claim 1, it is characterised in that：In step 102, the influence factor is：Sleeve pipe, cement sheath, Annular fluid, shale content and gravel filling.
- 3. method according to claim 1, it is characterised in that：Carrying out data fitting using reference lamina method described in step 103 is Carried out based on the reference lamina that step 102 is chosen, wherein：（1）The choosing method of annular fluid factor correction reference lamina：Select the water layer not influenceed by annular space, and the mud of this layer Matter content, porosity and whether there is gravel to fill these three parameters are roughly the same with layer holding to be corrected, take corresponding interval C/O values are as annular space calibration mark layer characteristic；（2）Gravel fills the choosing method of factor correction reference lamina：Select the minimum water layer of shale content, and the mud on the stratum Matter content, porosity and whether influenceed that these three parameters are roughly the same with layer holding to be corrected by annular space, take corresponding interval C/O values fill calibration mark layer characteristic as gravel.
- 4. method according to claim 1, it is characterised in that：The establishment step of calibration model described in step 103 specifically includes： Annular fluid is carried out to individual well and gravel fills two influence factors and analyzed, according to the form of curve, as a certain interval C/O Stepped increase is showed compared with the envelope size of adjacent layer position, then it is assumed that the layer is deposited with Si/Ca envelopes of curves area Influenceed in annular fluid；Choosing first is influenceed the C/O value X of interval by annular fluid and gravel filling, then is chosen not by Annular cutting The C/O values Y for the interval that body and gravel filling influence；The data of selection are handled, are that ordinate is established using X as abscissa, Y Scatter diagram, Y data and X parameter are established into data relationship, according to analysis result, it is Y=aX+b to establish correction fitting formula, wherein, Y be mark interval C/O values, dimensionless；X be impacted interval C/O values, dimensionless；A is the slope of curve, and b is intercept.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106958443B (en) * | 2017-05-02 | 2020-10-09 | 长江大学 | Method and system for correcting carbon-oxygen ratio logging drilling fluid invasion influence factors |
| CN107152277B (en) * | 2017-06-07 | 2020-11-10 | 长江大学 | Method and system for calculating residual oil saturation degree through carbon-oxygen ratio logging |
| CN108661632B (en) * | 2018-05-07 | 2022-02-11 | 何巍巍 | High-precision carbon-oxygen ratio logging method |
| CN109779618B (en) * | 2019-01-10 | 2020-07-07 | 中国石油大学(北京) | Method and device for determining formation residual oil saturation |
| CN109779611A (en) * | 2019-02-21 | 2019-05-21 | 中陕核工业集团地质调查院有限公司 | Application of the petroleum hole cementing concrete ring property parameters in the amendment of old well gamma repetition measurement coefficient |
| CN109915120B (en) * | 2019-04-16 | 2022-06-03 | 北京恒泰万博石油技术股份有限公司 | Correction method of resistivity logging while drilling system based on environmental factors |
| CN112031742B (en) * | 2020-09-03 | 2023-07-04 | 中海油田服务股份有限公司 | Carbon-oxygen ratio energy spectrum logging saturation interpretation method based on database |
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2015
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Patent Citations (5)
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|---|---|---|---|---|
| US4136278A (en) * | 1977-07-14 | 1979-01-23 | Dresser Industries, Inc. | Method and apparatus for pulsed neutron spectral analysis using spectral stripping |
| US8011238B2 (en) * | 2008-10-09 | 2011-09-06 | Chevron U.S.A. Inc. | Method for correcting the measured concentrations of gas components in drilling mud |
| CN101906963A (en) * | 2010-07-23 | 2010-12-08 | 中国石油化工集团公司 | Method for determining saturation by using C/O and formation macro capture cross-section intersecting technique |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Applicant after: China Offshore Oil Group Co., Ltd. Applicant after: CNOOC (China) Limited Zhanjiang Branch Address before: China CNOOC Building No. 25 Beijing 100000 Chaoyang District Chaoyangmen North Street Applicant before: China National Offshore Oil Corporation Applicant before: CNOOC (China) Limited Zhanjiang Branch |
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Inventor after: Li Yuelin Inventor after: Guo Haimin Inventor after: He Shenglin Inventor after: Zheng Yongjian Inventor after: Wang Lijuan Inventor before: Li Yuelin Inventor before: Guo Haimin Inventor before: He Shenglin Inventor before: Zheng Yongjian Inventor before: Wang Lijuan |