CN106958443B - Method and system for correcting carbon-oxygen ratio logging drilling fluid invasion influence factors - Google Patents
Method and system for correcting carbon-oxygen ratio logging drilling fluid invasion influence factors Download PDFInfo
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- CN106958443B CN106958443B CN201710301023.XA CN201710301023A CN106958443B CN 106958443 B CN106958443 B CN 106958443B CN 201710301023 A CN201710301023 A CN 201710301023A CN 106958443 B CN106958443 B CN 106958443B
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- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 title claims abstract description 144
- 239000012530 fluid Substances 0.000 title claims abstract description 58
- 238000005553 drilling Methods 0.000 title claims abstract description 57
- 230000009545 invasion Effects 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000000342 Monte Carlo simulation Methods 0.000 claims abstract description 28
- 238000012937 correction Methods 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000005755 formation reaction Methods 0.000 claims description 33
- 230000015572 biosynthetic process Effects 0.000 claims description 31
- 229910052760 oxygen Inorganic materials 0.000 claims description 24
- 239000001301 oxygen Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 229910052799 carbon Inorganic materials 0.000 claims description 16
- 230000001419 dependent effect Effects 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 10
- 230000001939 inductive effect Effects 0.000 claims description 6
- 238000012795 verification Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 239000003550 marker Substances 0.000 claims description 2
- 238000010200 validation analysis Methods 0.000 claims 1
- 230000033558 biomineral tissue development Effects 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- 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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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a correction method and a system for invasion influence factors of drilling fluid in carbon-oxygen ratio logging, wherein Monte Carlo simulation is carried out by arranging a grid cell card, a curved surface card and a material card, so that carbon-oxygen ratios corresponding to different porosities when drilling fluid invades under the set stratum environment and the borehole environment are simulated, a relation curve of the porosity and the carbon-oxygen ratio is fitted, a function relation of the porosity and the carbon-oxygen ratio is concluded, a volume model is utilized to correct the actually measured stratum carbon-oxygen ratio in the carbon-oxygen ratio logging, and the influence factor of the invasion of the drilling fluid in the carbon-oxygen ratio logging is corrected, so that the actually measured carbon-oxygen ratio is more accurate, and the interference of the invasion of the drilling fluid on the measured carbon-oxygen ratio is eliminated.
Description
Technical Field
The invention relates to the field of carbon-oxygen ratio logging, in particular to a method and a system for correcting invasion influence factors of a carbon-oxygen ratio logging drilling fluid.
Background
During the production of oil fields, various pipe strings (tubing, screens, casing) are run into the borehole, and researchers have performed a series of theoretical and instrumental research and development work since the 20 th century, 60 s, in order to enable the measurement of various parameters in the formation in a cased well. Early-appearing through-casing logging instruments were primarily thermal neutron lifetime and carbon-to-oxygen ratio logs.
The carbon-oxygen ratio well logging is to utilize a pulse neutron source to emit high-energy fast neutron pulses with the energy of 14MeV to a stratum, gamma rays emitted when atomic nuclei and fast neutrons in the stratum generate inelastic scattering and gamma rays emitted when the atomic nuclei capture thermal neutrons are measured respectively, the energy of inelastic scattering gamma rays and capture gamma rays generated by different atomic nuclei is different, the inelastic scattering gamma rays and the capture gamma rays with different energy are recorded, and various elements and the content of the elements in the stratum can be analyzed.
The carbon-oxygen ratio logging has the main advantages that various elements in the stratum can be directly measured by penetrating through a pipe column structure and a cement sheath, the influence of the water mineralization of the stratum is avoided, the method has obvious advantages when the difference between the water mineralization of the stratum and the water mineralization of injection is large, the application effect is good when the logging is carried out in the stratum with high porosity, the problem that the existing electric logging cannot evaluate the saturation of the reservoir in a cased well is solved, and the defect that the neutron life logging has poor measuring effect in a low-stratum water mineralization area is overcome. The method provides information of physical property, lithology, oiliness, effective thickness and the like of the stratum, and also provides parameters of underground gas, oil and water dynamics, productivity, residual oil saturation, oil extraction index and the like.
Because high-energy fast neutrons need to penetrate through an oil pipe, a casing, an oil casing annulus and a cement ring to reach the stratum when the carbon-oxygen ratio is measured through the casing, the stratum is possibly influenced by the invasion of drilling fluid, and therefore the measured response value contains information of non-stratum and information of non-real stratum. During the carbon-oxygen ratio logging data processing process, the main influence factors of the influences need to be corrected so as to improve the accuracy of the residual oil saturation calculation. Currently, there is a lack of correction methods and measures for this effect of drilling fluid invasion in carbon-to-oxygen ratio logging.
Disclosure of Invention
The invention aims to overcome the technical defects, provides a method and a system for correcting invasion influence factors of a carbon-oxygen ratio logging drilling fluid, and solves the technical problems in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention provides a method for correcting invasion influence factors of a carbon-oxygen ratio logging drilling fluid, which comprises the following steps:
s1, setting a grid cell card, a curved surface card and a material card, and establishing a Monte Carlo simulation model;
s2, carrying out Monte Carlo simulation, simulating carbon-oxygen ratios corresponding to different porosities when drilling fluid invades under the set formation environment and the well bore environment, respectively taking the porosity and the carbon-oxygen ratios as independent variables and dependent variables, fitting a relation curve of the porosity and the carbon-oxygen ratios, and inducing a functional relation of the porosity and the carbon-oxygen ratios;
s3, verifying the functional relation between the porosity and the carbon-oxygen ratio summarized in the S2;
and S4, judging whether the functional relation between the porosity and the carbon-oxygen ratio is a linear relation, and if so, correcting the actually measured formation carbon-oxygen ratio in the carbon-oxygen ratio logging by adopting a volume model.
The technical scheme of the invention also provides a system for correcting the invasion influence factors of the carbon-oxygen ratio logging drilling fluid, which comprises the following steps:
a model building module: setting a grid cell card, a curved surface card and a material card, and establishing a Monte Carlo simulation model;
monte carlo simulation module: carrying out Monte Carlo simulation, simulating carbon-oxygen ratios corresponding to different porosities when drilling fluid invades under the set formation environment and the well bore environment, respectively taking the porosity and the carbon-oxygen ratios as independent variables and dependent variables, fitting a relation curve of the porosity and the carbon-oxygen ratios, and inducing a functional relation of the porosity and the carbon-oxygen ratios;
a verification module: verifying the functional relation between the porosity and the carbon-oxygen ratio induced in the Monte Carlo simulation module;
a correction module: and judging whether the functional relation between the porosity and the carbon-oxygen ratio is a linear relation or not, and if so, correcting the actually measured formation carbon-oxygen ratio in the carbon-oxygen ratio logging in a volume model mode.
Compared with the prior art, the invention has the beneficial effects that: through setting up the grid cell card, the curved surface card, the material card carries out the simulation of Monte Carlo, simulate out and set for the stratum environment, the carbon-oxygen ratio that different porosities when drilling fluid invades under the well bore environment correspond, the relation curve of fit porosity and carbon-oxygen ratio, conclude the functional relation of porosity and carbon-oxygen ratio, utilize the volume model to rectify actual measurement's stratum carbon-oxygen ratio in the carbon-oxygen ratio logging, this influence factor of drilling fluid invasion has been rectified in the carbon-oxygen ratio logging, make actual measurement's carbon-oxygen ratio more accurate, the interference of drilling fluid invasion to measured carbon-oxygen ratio has been got rid of.
Drawings
FIG. 1 is a flow chart of a method for correcting invasion influence factors of a carbon-oxygen ratio logging drilling fluid provided by the invention;
FIG. 2 is a block diagram of a system for correcting invasion influence factors of a carbon-oxygen ratio logging drilling fluid, provided by the invention;
fig. 3 is a block diagram of the structure of the correction module in fig. 2.
In the drawings: 1. the system comprises a carbon-oxygen ratio logging drilling fluid invasion influence factor correction system, 11, a model building module, 12, a Monte Carlo simulation module, 13, a verification module, 14, a correction module, 141, a mark layer determination unit, 142, an invasion volume calculation unit, 143, an actual measurement unit, 144 and a correction unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a method for correcting invasion influence factors of a carbon-oxygen ratio logging drilling fluid, which comprises the following steps:
s1, setting a grid cell card, a curved surface card and a material card, and establishing a Monte Carlo simulation model;
s2, carrying out Monte Carlo simulation, simulating carbon-oxygen ratios corresponding to different porosities when drilling fluid invades under the set formation environment and the well bore environment, respectively taking the porosity and the carbon-oxygen ratios as independent variables and dependent variables, fitting a relation curve of the porosity and the carbon-oxygen ratios, and inducing a functional relation of the porosity and the carbon-oxygen ratios;
s3, verifying the functional relation between the porosity and the carbon-oxygen ratio summarized in the S2;
and S4, judging whether the functional relation between the porosity and the carbon-oxygen ratio is a linear relation, and if so, correcting the actually measured formation carbon-oxygen ratio in the carbon-oxygen ratio logging by adopting a volume model.
The invention relates to a method for correcting invasion influence factors of a carbon-oxygen ratio logging drilling fluid, which comprises the following steps of S1:
the grid cell card describes the geometric unit of stratum cross section when the carbon-oxygen ratio is logged, and the stratum cross section includes the cross section that stratum, measuring equipment, borehole environment constitute, and the borehole environment includes: the cement sheath, the pipe column (casing, oil pipe, screen pipe), the well fluid (oil, water), the curved surface card describes the curved surface of the grid element, the material card describes the element components of the cross section of the stratum, and the element components comprise the types of the elements and the proportion of each element.
The invention relates to a method for correcting invasion influence factors of a carbon-oxygen ratio logging drilling fluid, which comprises the following steps of S2:
different parameter settings of the grid cell card, the curved surface card and the material card correspond to different stratum environments and borehole environments.
The invention relates to a method for correcting invasion influence factors of a carbon-oxygen ratio logging drilling fluid, which comprises the following steps of S3:
and replacing the set formation environment and the set borehole environment, performing Monte Carlo simulation again, simulating carbon-oxygen ratios corresponding to different porosities when the drilling fluid invades under the replaced formation environment and the borehole environment, respectively taking the porosity and the carbon-oxygen ratios as independent variables and dependent variables, fitting a relation curve of the porosity and the carbon-oxygen ratios, and verifying the functional relation of the porosity and the carbon-oxygen ratios summarized in S2.
The method for correcting the invasion influence factors of the drilling fluid for the carbon-oxygen ratio logging comprises the following steps of correcting the actually measured formation carbon-oxygen ratio in the carbon-oxygen ratio logging in a volume model mode in step S4:
s41, determining a pure water layer in the stratum with the carbon-oxygen ratio to be corrected during logging of the carbon-oxygen ratio as a mark layer, and recording the carbon-oxygen ratio C/O of the pure water layerWater (W)；
S42, calculating the total volume Z of the stratum with the carbon-oxygen ratio to be corrected and the invasion volume Z of the drilling fluid into the stratum during the carbon-oxygen ratio logging1And then subtracting the invaded volume from the total volume to obtain the non-invaded volume Z of the drilling fluid non-invaded stratum2Wherein Z is2＝Z-Z1；
S43, measuring the carbon-oxygen ratio C/O in the stratum by using the carbon-oxygen ratio loggingMeasuring；
S44 carbon to oxygen ratio C/O in formation measured for carbon to oxygen ratio logMeasuringAnd (3) correcting: C/O to be acquiredWater (W)、Z1、Z2、C/OMeasuringSubstituting into a volume model formula to calculate the corrected carbon-oxygen ratio C/O of the stratumCorrection ofThe volume model formula is:
the invention also provides a system 1 for correcting the invasion influence factors of the carbon-oxygen ratio logging drilling fluid, which comprises:
the model building module 11: setting a grid cell card, a curved surface card and a material card, and establishing a Monte Carlo simulation model;
monte carlo simulation module 12: carrying out Monte Carlo simulation, simulating carbon-oxygen ratios corresponding to different porosities when drilling fluid invades under the set formation environment and the well bore environment, respectively taking the porosity and the carbon-oxygen ratios as independent variables and dependent variables, fitting a relation curve of the porosity and the carbon-oxygen ratios, and inducing a functional relation of the porosity and the carbon-oxygen ratios;
the verification module 13: verifying the functional relation between the porosity and the carbon-oxygen ratio induced in the Monte Carlo simulation module;
the correction module 14: and judging whether the functional relation between the porosity and the carbon-oxygen ratio is a linear relation or not, and if so, correcting the actually measured formation carbon-oxygen ratio in the carbon-oxygen ratio logging in a volume model mode.
The correction system 1 for the carbon-oxygen ratio logging drilling fluid invasion influence factors comprises a model building module 11:
the grid cell card describes a geometric unit of a stratum cross section during carbon-oxygen ratio logging, the stratum cross section comprises a cross section formed by a stratum, measuring equipment and a borehole environment, the curved surface card describes a curved surface of the grid cell, and the material card describes element components of the stratum cross section.
The system 1 for correcting the carbon-oxygen ratio logging drilling fluid invasion influence factors comprises a Monte Carlo simulation module 12:
different parameter settings of the grid cell card, the curved surface card and the material card correspond to different stratum environments and borehole environments.
The invention relates to a system 1 for correcting carbon-oxygen ratio logging drilling fluid invasion influence factors, wherein a correction module 14 comprises:
the marker layer determination unit 141: determining a pure water layer in the stratum with the carbon-oxygen ratio to be corrected during logging of the carbon-oxygen ratio as a mark layer, and recording the carbon-oxygen ratio of the pure water layerValue C/OWater (W)；
Intrusion volume calculation unit 142: calculating the total volume Z of the formation to be corrected for the carbon-to-oxygen ratio and the invasion volume Z of the drilling fluid into the formation1And then subtracting the invaded volume from the total volume to obtain the non-invaded volume Z of the drilling fluid non-invaded stratum2Wherein Z is2＝Z-Z1；
Actual measurement unit 143: carbon-to-oxygen ratio C/O measurement in formations using carbon-to-oxygen ratio logsMeasuring；
The correction unit 144: carbon to oxygen ratio C/O in formations measured for carbon to oxygen logMeasuringCorrecting the acquired C/OWater (W)、Z1、Z2、C/OMeasuringSubstituting into a volume model formula to calculate the corrected carbon-oxygen ratio C/O of the stratumCorrection ofThe volume model formula is:
the correction system 1 for the carbon-oxygen ratio logging drilling fluid invasion influence factors comprises a verification module 13:
and replacing the set formation environment and the set borehole environment, performing Monte Carlo simulation again, simulating carbon-oxygen ratios corresponding to different porosities when the drilling fluid invades under the replaced formation environment and the borehole environment, fitting a relation curve of the porosity and the carbon-oxygen ratios by taking the porosity and the carbon-oxygen ratios as independent variables and dependent variables respectively, and verifying the functional relation of the porosity and the carbon-oxygen ratios summarized in the Monte Carlo simulation module 12.
Compared with the prior art, the invention has the beneficial effects that: through setting up the grid cell card, the curved surface card, the material card carries out the simulation of Monte Carlo, simulate out and set for the stratum environment, the carbon-oxygen ratio that different porosities when drilling fluid invades under the well bore environment correspond, the relation curve of fit porosity and carbon-oxygen ratio, conclude the functional relation of porosity and carbon-oxygen ratio, utilize the volume model to rectify actual measurement's stratum carbon-oxygen ratio in the carbon-oxygen ratio logging, this influence factor of drilling fluid invasion has been rectified in the carbon-oxygen ratio logging, make actual measurement's carbon-oxygen ratio more accurate, the interference of drilling fluid invasion to measured carbon-oxygen ratio has been got rid of.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A method for correcting invasion influence factors of a carbon-oxygen ratio logging drilling fluid is characterized by comprising the following steps:
s1, setting a grid cell card, a curved surface card and a material card, and establishing a Monte Carlo simulation model;
s2, carrying out Monte Carlo simulation, simulating carbon-oxygen ratios corresponding to different porosities when drilling fluid invades under the set formation environment and the well bore environment, fitting a relation curve of the porosity and the carbon-oxygen ratio by taking the porosity and the carbon-oxygen ratio as an independent variable and a dependent variable respectively, and inducing a functional relation of the porosity and the carbon-oxygen ratio;
s3, verifying the functional relation between the porosity and the carbon-oxygen ratio summarized in S2;
s4, judging whether the function relation between the porosity and the carbon-oxygen ratio is linear, if so, correcting the actually measured formation carbon-oxygen ratio in the carbon-oxygen ratio logging by adopting a volume model;
the step of correcting the formation carbon-oxygen ratio actually measured in the carbon-oxygen ratio logging by adopting a volume model in the step S4 comprises the following steps:
s41, determining a pure water layer in the stratum with the carbon-oxygen ratio to be corrected during logging of the carbon-oxygen ratio as a mark layer, and recording the carbon-oxygen ratio C/O of the pure water layerWater (W)；
S42, calculating the total volume Z of the stratum with the carbon-oxygen ratio to be corrected and the invasion volume Z of the drilling fluid into the stratum1And then subtracting the invaded volume from the total volume to obtain the non-invaded volume Z of the drilling fluid non-invaded stratum2Wherein Z is2＝Z-Z1；
S43, logging and measuring stratum by using carbon-oxygen ratioMedium carbon to oxygen ratio C/OMeasuring；
S44 carbon to oxygen ratio C/O in formation measured for carbon to oxygen ratio logMeasuringAnd (3) correcting: C/O to be acquiredWater (W)、Z1、Z2、C/OMeasuringSubstituting into a volume model formula to calculate the corrected carbon-oxygen ratio C/O of the stratumCorrection ofThe volume model formula is:
2. the method for correcting the carbon to oxygen ratio logging drilling fluid invasion influencing factors according to claim 1, wherein in step S1:
the grid cell card describes a geometric unit of a stratum cross section during carbon-oxygen ratio logging, the stratum cross section comprises a cross section formed by a stratum, measuring equipment and a borehole environment, the curved surface card describes a curved surface of the grid cell, and the material card describes element components of the stratum cross section.
3. The method for correcting the carbon to oxygen ratio logging drilling fluid invasion influencing factors according to claim 1, wherein in step S2:
the different parameter settings of the grid cell card, the curved surface card and the material card correspond to different stratum environments and borehole environments.
4. The method for correcting the carbon to oxygen ratio logging drilling fluid invasion influencing factors according to claim 1, wherein in step S3:
and replacing the set formation environment and the set borehole environment, performing Monte Carlo simulation again, simulating carbon-oxygen ratios corresponding to different porosities when the drilling fluid invades in the replaced formation environment and the borehole environment, fitting a relation curve of the porosity and the carbon-oxygen ratios by taking the porosity and the carbon-oxygen ratios as independent variables and dependent variables respectively, and verifying the functional relation of the porosity and the carbon-oxygen ratios summarized in S2.
5. A system for correcting carbon to oxygen ratio logging drilling fluid invasion affecting factors, comprising:
a model building module: setting a grid cell card, a curved surface card and a material card, and establishing a Monte Carlo simulation model;
monte carlo simulation module: carrying out Monte Carlo simulation, simulating carbon-oxygen ratios corresponding to different porosities when drilling fluid invades in a set formation environment and a well bore environment, respectively taking the porosity and the carbon-oxygen ratios as independent variables and dependent variables, fitting a relation curve of the porosity and the carbon-oxygen ratios, and inducing a functional relation of the porosity and the carbon-oxygen ratios;
a verification module: verifying the functional relation between the porosity and the carbon-oxygen ratio summarized in a Monte Carlo simulation module;
a correction module: judging whether the functional relation between the porosity and the carbon-oxygen ratio is a linear relation, and if so, correcting the actually measured formation carbon-oxygen ratio in the carbon-oxygen ratio logging in a volume model manner;
the correction module includes:
a marker layer determination unit: determining a pure water layer in the stratum with the carbon-oxygen ratio to be corrected during logging of the carbon-oxygen ratio as a mark layer, and recording the carbon-oxygen ratio C/O of the pure water layerWater (W)；
Intrusion volume calculation unit: calculating the total volume Z of the formation to be corrected for the carbon-to-oxygen ratio and the invasion volume Z of the drilling fluid into the formation1And then subtracting the invaded volume from the total volume to obtain the non-invaded volume Z of the drilling fluid non-invaded stratum2Wherein Z is2＝Z-Z1；
An actual measurement unit: carbon-to-oxygen ratio C/O measurement in formations using carbon-to-oxygen ratio logsMeasuring；
A correction unit: carbon to oxygen ratio C/O in formations measured for carbon to oxygen logMeasuringCorrecting the acquired C/OWater (W)、Z1、Z2、C/OMeasuringSubstituting into a volume model formula to calculate the corrected carbon-oxygen ratio C/O of the stratumCorrection ofVolume modelThe formula is as follows:
6. the system for correcting carbon to oxygen logging drilling fluid invasion influencing factors of claim 5, wherein in the model building module:
the grid cell card describes a geometric unit of a stratum cross section during carbon-oxygen ratio logging, the stratum cross section comprises a cross section formed by a stratum, measuring equipment and a borehole environment, the curved surface card describes a curved surface of the grid cell, and the material card describes element components of the stratum cross section.
7. The system for correcting carbon to oxygen logging drilling fluid invasion affecting factors of claim 5, wherein in the Monte Carlo simulation module:
the different parameter settings of the grid cell card, the curved surface card and the material card correspond to different stratum environments and borehole environments.
8. The system for correcting carbon to oxygen logging drilling fluid invasion affecting factors of claim 5, wherein in the validation module:
and replacing the set formation environment and the set borehole environment, performing Monte Carlo simulation again, simulating carbon-oxygen ratios corresponding to different porosities when the drilling fluid invades under the replaced formation environment and the borehole environment, fitting a relation curve of the porosity and the carbon-oxygen ratios by taking the porosity and the carbon-oxygen ratios as independent variables and dependent variables respectively, and verifying the functional relation of the porosity and the carbon-oxygen ratios summarized in the Monte Carlo simulation module.
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