CN108222924A - Reservoir fluid identification method - Google Patents
Reservoir fluid identification method Download PDFInfo
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- CN108222924A CN108222924A CN201611155926.3A CN201611155926A CN108222924A CN 108222924 A CN108222924 A CN 108222924A CN 201611155926 A CN201611155926 A CN 201611155926A CN 108222924 A CN108222924 A CN 108222924A
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- 239000012530 fluid Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000008398 formation water Substances 0.000 claims abstract description 34
- 230000004044 response Effects 0.000 claims abstract description 32
- 238000012937 correction Methods 0.000 claims description 26
- 239000003129 oil well Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 3
- 230000009545 invasion Effects 0.000 abstract description 6
- 230000009977 dual effect Effects 0.000 abstract description 2
- 239000011435 rock Substances 0.000 description 18
- 230000015572 biosynthetic process Effects 0.000 description 16
- 239000000706 filtrate Substances 0.000 description 16
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 13
- 238000013329 compounding Methods 0.000 description 10
- 239000002002 slurry Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000035699 permeability Effects 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000010430 carbonatite Substances 0.000 description 2
- 230000005251 gamma ray Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003595 spectral effect Effects 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)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention provides a reservoir fluid identification method, which comprises the following steps: according to a response equation of a dual laterolog instrument and logging information of a to-be-logged well, inverting to obtain the true resistivity of the to-be-logged reservoir; acquiring apparent formation water resistivity according to the true resistivity of the reservoir and the porosity of the reservoir; according to the reservoir fluid identification method, the influence of mud invasion on reservoir fluid identification is eliminated, and the accuracy of reservoir fluid identification is improved.
Description
Technical field
The present invention relates to logging technique field more particularly to a kind of fluid identification of reservoir methods.
Background technology
In recent years, with the progress and development of petroleum exploration and development science and technology, low-porosity fracture hole type carbonatite is in oil oil
Status in gas exploration becomes to become more and more important, and in this year oil gas entirety reserves, oil gas stores up in low-porosity fracture hole type carbonatite
The ratio of amount gradually increases, and low-porosity fracture hole type carbonate rock reservoir flow net model is the key that petroleum vapour exploration.
In the prior art, the mean value and variance of apparant formation water resistivity are calculated according to well-log information, and according to apparent reservoir water
The mean value and variance of resistivity judge it is the fluid of oily or aqueous fluid in reservoir.
But after being opened due to low-porosity fracture-cavity type carbonate stratum brill, slurry compounding stratum is driven away and substitutes stratum
Connate fluid in interstitial space, so as to increase the difficulty of properties of fluid in bearing stratum identification.
Invention content
The present invention provides a kind of fluid identification of reservoir method, for solving in the prior art, when slurry compounding is serious, and meeting
The problem of fluid properties is caused to judge by accident.
The present invention provides a kind of fluid identification of reservoir method, including：
According to On Dual-Lateral Log response equation and well-log information to be logged well, reservoir to be logged well described in acquisition
True resistivity；
According to the true resistivity of the reservoir and the porosity of the reservoir, apparant formation water resistivity is obtained；
The fluid type of the reservoir is identified according to the apparant formation water resistivity.
Optionally, when described when well logging is inclined shaft or horizontal well, the method further includes：
Resistivity anisotropy correction coefficient λ is obtained according to the well-log information of statistics；
The well-log information to be logged well according to resistivity anisotropy correction coefficient λ corrections；
It is described according to On Dual-Lateral Log response equation and well-log information to be logged well, storage to be logged well described in acquisition
The true resistivity of layer, including：
The well-log information to be logged well according to after On Dual-Lateral Log response equation and correction, obtains institute
State the true resistivity of reservoir to be logged well.
Optionally, the well-log information to be logged well according to resistivity anisotropy correction coefficient λ corrections, packet
It includes：
According toCalculate the apparent resistivity of the reservoir to be logged well after obtaining correction
Rh'；
Wherein, θ ' is the hole angle of the oil well, Ra' apparent resistivity for the reservoir before correcting in the well-log information, λ
It is corrected for resistivity anisotropy correction coefficient.
Optionally, it is described according to On Dual-Lateral Log response equation and well-log information to be logged well, it is treated described in acquisition
The true resistivity of the reservoir of well logging, including：
According to deep lateral log response equationWith shallow lateral survey
Well response equationInversion Calculation obtains the true resistivity of the reservoir；
Wherein, RdaFor the deep lateral log response that deep lateral log response equation calculates, RsaIt is responded for shallow lateral logging
The shallow lateral logging response of equation calculation, Ud、UsMonitor electrode M during for depth laterolog1The potential at place, PdiWith PsiIt is right
Answer electrode screening electric current or principal current, UdiAnd UsiFor single columnar electrode cylindricality boundary condition solution, a be instrument radius, ρ0
For wellbore radius, ρ1For average invaded zone depth, RmFor mud resistivity, RxoFor average invaded zone resistivity, RtFor ground layer original
Resistivity, KdFor deep lateral log K factor, I0For main electrode current, KsFor deep lateral log K factor.
Optionally, it is described according to the true resistivity of the reservoir and the porosity of the reservoir, obtain apparent reservoir water resistance
Rate, including：
Using formulaIt calculates and obtains the apparant formation water resistivity Rwa；
Wherein, φ is the porosity of the reservoir,True resistivity for the reservoir.
Optionally, the fluid type that the reservoir is identified according to the apparant formation water resistivity, including：
When the apparant formation water resistivity is more than predetermined threshold value, the fluid that the fluid type is oily is determined；
When the apparant formation water resistivity is not more than predetermined threshold value, it is aqueous fluid to determine the fluid type.
Fluid identification of reservoir method provided by the invention, by according to On Dual-Lateral Log response equation and waiting to log well
Well-log information, the true resistivity of reservoir to be logged well described in acquisition；According to the true resistivity of the reservoir and the reservoir
Porosity obtains apparant formation water resistivity；The fluid type of the reservoir is identified according to the apparant formation water resistivity, is solved
After being drilled out due to the reservoir of carbonate rock, mud filtrate invades permeable formation, and the resistivity and rock of mud filtrate are original
The resistivity of pore-fluid is different, causes invaded zone resistivity different from stratum raw resistivity, with Logging Data To Evaluate stratum
The problem of class of fluids can judge by accident eliminates the influence that slurry compounding identifies reservoir fluid classification, improves reservoir stream
The accuracy of body classification identification.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the flow chart of fluid identification of reservoir method that the embodiment of the present invention one provides；
Fig. 2 is the flow chart of fluid identification of reservoir method provided by Embodiment 2 of the present invention；
Fig. 3 is the flow chart of fluid identification of reservoir method that the embodiment of the present invention three provides；
Fig. 4 is the flow chart of fluid identification of reservoir method that the embodiment of the present invention four provides.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiments obtained without creative efforts shall fall within the protection scope of the present invention.
Fig. 1 is the flow chart of fluid identification of reservoir method that the embodiment of the present invention one provides, as shown in Figure 1, this method packet
It includes：
S101, according to On Dual-Lateral Log response equation and well-log information to be logged well, it is to be logged well described in acquisition
The true resistivity of reservoir.
Wherein, after stratum is drilled out, permeable formation can be invaded in the mud of the near wellbore to be logged well, is made described to be measured
The resistivity radial distribution of the rock medium of the near wellbore of well is uneven.In the rock stratum hole at the borehole wall to be logged well
In fluid almost all replaced by mud filtrate, this part is flushed zone, resistivityIn the outside of flushed zone
It is the intermediate zone that mud filtrate is partly filled in a hole, the general name of flushed zone and intermediate zone is invaded zone, resistivity
For Ri；It is not by the undisturbed formation of slurry compounding, resistivity R outward againt.To fracture hole carbonate reservoir, asked for simplification
The flushed zone and the intermediate zone are collectively referred to as invaded zone by topic, the present invention, and the invaded zone described in measurement for waiting to log well
True formation resistivity be a kind of interference.
Wherein, when described when the fluid resistivity contained originally in the formation pore logged well is relatively low, resistivity is higher
After mud filtrate intrusion, the rock resistivity raising (R of the invaded zonet<Ri), this slurry compounding is more to increase resistance slurry compounding
Appear in water layer；When the fluid resistivity contained originally in the formation pore to be logged well the stratum to be logged well than described in infiltration
Mud filtrate resistivity it is high when, after mud filtrate intrusion, the invaded zone rock resistivity reduces (Rt>Ri), this mud is invaded
Enter and invaded for anti-drag mud, is generally present in the not bery high oil reservoir of formation water salinity.It is described for the situation of decreased resistance invasion
The resistivity of rock is relatively low near the radially borehole wall to be logged well, and radially the resistivity on the deeper stratum to be logged well is higher.
In the present embodiment, the decreased resistance invasion model ideal to be logged well can be turned to step model, if by invaded zone
Radius bigger, then its is equivalentAlso bigger, if likewise, handleBigger, then equivalent invasion radius bigger.In this implementation,
The class of fluids identification of carbonate rock oil-bearing reservoir can be reduced to step anti-drag mud intrusion model, the storage of carbonate rock oily
The resistivity distribution of layer can be reduced to the distribution of step decreased resistance invasion resistivity.
Wherein, it to On Dual-Lateral Log model in this present embodiment, waits to log well and specifically for described during well logging
Depth point, the resistivity of the invaded zone are distributed what is be to determine, the quality of the stratum permeability depending on the certain depth point.
If the stratum permeability of the certain depth point is good, the invaded zone distribution is wide；If the stratum infiltration of the certain depth point
Property is poor, then the invaded zone narrowly distributing.In the present embodiment, well logging ground is treated described in being calculated with appropriate apparatus measures model
The invaded zone resistivity radial distribution characteristic parameter of layer, this characteristic parameter can express the stratum of the certain depth point
Infiltrative quality.
In the present embodiment, it is described to treat that well logging be straight well, horizontal well or inclined shaft, but be not limited thereto.
In the present embodiment, the reservoir to be logged well is suitable for adding conductive crack or the development of corrosion hole without shale
Reservoir, such as fracture-cavity type carbonate reservoir, Fractured Volcanic reservoir and slit formation tight sandstone reservoir, but not as
Limit.
It should be noted that the well-log information to be logged well includes depth, the shallow resistivity money that dual laterolog equipment measures
Material, gamma ray log data (or natural gamma-ray spectral), density log data, Boundary Using Sonic Logging, well
Drift log data etc..
S102, according to the true resistivity of the reservoir and the porosity of the reservoir, obtain apparant formation water resistivity.
Wherein, the apparent reservoir water earthing resistivity of the reservoir to be logged well is that the fluid type of reservoir through to be logged well is carried out
One important parameter of identification.
S103, the fluid type that the reservoir is identified according to the apparant formation water resistivity.
Wherein, reservoir fluid classification to be logged well described in judgement can be compared oil-bearing reservoir and aqueous reservoir, contain
The apparant formation water resistivity that the true resistivity that oil and gas reservoir inverting obtains calculates is than true resistance that aqueous reservoir inversion obtains
The formation water resistivity that rate calculates is big.
In the present embodiment, by according to On Dual-Lateral Log response equation and well-log information to be logged well, inverting
The true resistivity of reservoir to be logged well described in acquisition；According to the true resistivity of the reservoir and the porosity of the reservoir, obtain
Apparant formation water resistivity；The fluid type of the reservoir is identified according to the apparant formation water resistivity, is solved due to carbonate
After the reservoir of rock is drilled out, mud filtrate intrusion permeable formation, resistivity and the original pore-fluid of rock of mud filtrate
Resistivity is different, causes invaded zone resistivity different from stratum raw resistivity, with Logging Data To Evaluate formation fluid classification meeting
The problem of judging by accident eliminates the influence that slurry compounding identifies reservoir fluid classification, improves the identification of reservoir fluid classification
Accuracy.
Fig. 2 is the flow chart of fluid identification of reservoir method provided by Embodiment 2 of the present invention, as shown in Fig. 2, the present embodiment
For treating well logging for inclined shaft or horizontal well, the method for the present embodiment includes：
S201, resistivity anisotropy correction coefficient is obtained according to the well-log information of statistics.
S202, well-log information to be logged well according to resistivity anisotropy correction coefficient correction.
Wherein, there are anisotropy for fracture-cavity type carbonate formation resistivity, and the resistivity of vertical direction is than level
The resistivity in direction is big.When al-lateral resistivity logger is logged well, due to the effect of bucking electrode, deep lateral log in straight well
The resistivity of main measurement stratum horizontal direction, the resistivity of the main measurement stratum vertical direction of deep lateral log in horizontal well,
The resistivity that deep lateral log mainly measures in Wells contains horizontal direction resistivity and vertical direction resistivity.In this reality
Apply in example, by Wells, horizontal well resistivity correction to straight well on, by statistics lead a well, straight well and corresponding horizontal well
Data determines resistivity anisotropy correction coefficient λ, then according to resistivity anisotropy correction coefficient λ corrections
Well-log information to be logged well.
It is assumed that the resistivity on stratum is transversely isotropic, formula (1) can be obtained through deriving,
R in formula (1)aThe apparent resistivity measured when for hole angle being θ.Formula (1) is transverse isotropy conducting medium
The apparent resistivity R of middle high angle hole or horizontal well measurementsaWith stratum horizontal resistivity RhBetween theoretical relationship.As θ=0, have
Ra=Rh, the resistivity of measurement mainly reflects stratum horizontal direction resistivity；WhenWhen, there is Ra=λ Rh, the resistivity of measurement
Main reflection stratum vertical direction resistivity.
Statistics lead a well and corresponding Wells (horizontal well) bilaterally data pair and hole angle, can estimate stratum it is each to
Different in nature coefficient.Formula (1) is rewritten as formula (2)
The resistivity data that straight well is measured is directly when as Rh, the data of gradient well measurements are Ra.To different regions, divide
Stratum counts straight well and corresponding horizontal well, high angle hole resistivity measurements, and formula can be made using principle of least square method
(2) λ value in.
Optionally, a kind of feasible realization method of S202 is：It is calculated according to formula (3) described to be measured after obtaining correction
The apparent resistivity R of the reservoir of wellh'。
Wherein, θ ' is the hole angle of the oil well, Ra' apparent resistivity for the reservoir before correcting in the well-log information, λ
For resistivity anisotropy correction coefficient.
S203, the well-log information to be logged well according to after On Dual-Lateral Log response equation and correction,
The true resistivity of reservoir to be logged well described in acquisition.
S204, according to the true resistivity of the reservoir and the porosity of the reservoir, obtain apparant formation water resistivity.
S205, the fluid type that the reservoir is identified according to the apparant formation water resistivity.
In the present embodiment, the specific implementation process of S203-S205 may refer to the associated description in embodiment illustrated in fig. 1,
Details are not described herein again.
In conclusion the present embodiment is solved after being drilled out due to the reservoir of carbonate rock, mud filtrate intrusion permeability
Stratum, the resistivity of mud filtrate is different from the resistivity of the original pore-fluid of rock, causes invaded zone resistivity former with stratum
Beginning resistivity is different, the problem of being judged by accident with Logging Data To Evaluate formation fluid classification, eliminates slurry compounding to reservoir
The influence of class of fluids identification improves the accuracy of reservoir fluid classification identification.
Fig. 3 is the flow chart of fluid identification of reservoir method that the embodiment of the present invention three provides, as shown in figure 3, the present embodiment
Method include：
S301, according to obtaining deep lateral log response equation (4) and shallow lateral logging response equation (5) Inversion Calculation
The true resistivity of reservoir.
Wherein, RdaFor the deep lateral log response that deep lateral log response equation calculates, RsaIt is responded for shallow lateral logging
The shallow lateral logging response of equation calculation, Ud、UsMonitor electrode M during for depth laterolog1The potential at place, PdiWith PsiIt is right
Answer electrode screening electric current or principal current, UdiAnd UsiFor single columnar electrode cylindricality boundary condition solution, a be instrument radius, ρ0
For wellbore radius, ρ1For average invaded zone depth, RmFor mud resistivity, RxoFor average invaded zone resistivity, RtFor ground layer original
Resistivity, KdFor deep lateral log K factor, I0For main electrode current, KsFor deep lateral log K factor.
Wherein, a suitable interval range is given according to practical mud filtrate resistivity and the well-log information, at this
In a suitable interval range, one group of parameter (a, ρ are given for equation (4) and equation (5)0,ρ1,Rm,Rxo,Rt) can count
Calculate one group of deep, shallow lateral logging response RdaAnd Rsa.For equation (4) and equation (5), fixed a, ρ0、RmValue gives difference
Parameter Rxo、ρ1、RtValue can be obtained by different depths, shallow lateral logging response, and the parameter is to suitable
Interval range in traversal find.
For equation (4) and equation (5), if the given average invaded zone resistivity R to be logged wellxoIt waits to log well to be described
Mud resistivity RmA multiple, the invasion radius ρ to be logged well1And the stratum raw resistivity R to be logged wellt
Value can calculate the corresponding depth to be logged well, shallow lateral logging response, deep, the shallow lateral survey that this group is calculated
Well response can be found out and immediate that group of given parameters value of practical logging value compared with practical logging value.Further,
One group of parameter (a, ρ are given again for equation (4) and equation (5)0,ρ1,Rm,Rxo,Rt), with above-mentioned identical method, can look for
Go out another pair and immediate that group of parameter of practical logging value, also, the parameter is traversed in given interval range,
After complete interval range of traversal, optimum value is searched out with error sum of squares minimum principle, this process is the refutation process.
By above-mentioned refutation process obtain described in true formation resistivity to be logged well
S302, according to the true resistivity of the reservoir and the porosity of the reservoir, obtain apparant formation water resistivity.
S303, the fluid type that the reservoir is identified according to the apparant formation water resistivity.
In the present embodiment, the specific implementation process of S302 and S303 may refer to the associated description in embodiment illustrated in fig. 1,
Details are not described herein again.
In conclusion the present embodiment is solved after being drilled out due to the reservoir of carbonate rock, mud filtrate intrusion permeability
Stratum, the resistivity of mud filtrate is different from the resistivity of the original pore-fluid of rock, causes invaded zone resistivity former with stratum
Beginning resistivity is different, the problem of being judged by accident with Logging Data To Evaluate formation fluid classification, eliminates slurry compounding to reservoir
The influence of class of fluids identification improves the accuracy of reservoir fluid classification identification.
Fig. 4 is the flow chart of fluid identification of reservoir method that the embodiment of the present invention four provides, as shown in figure 4, the present embodiment
Method include：
S401, according to On Dual-Lateral Log response equation and well-log information to be logged well, it is to be logged well described in acquisition
The true resistivity of reservoir.
In the present embodiment, the specific implementation process of S401 can embodiment as shown in Figure 3 associated description, it is no longer superfluous herein
It states.
S402, acquisition is calculated regarding ground using formula (6) according to the true resistivity of the reservoir and the porosity of the reservoir
Layer water resistance rate.
Wherein, porositys of the φ for the reservoir, Rt *True resistivity for the reservoir that Inversion Calculation obtains.
Wherein, the apparant formation water resistivity RwaIt is the required porosity of stratigraphic unit electric conductivity to be logged well.
For carbonate formation, when the porosity of the reservoir is identical, the electric conductivity of oil gas is than corresponding water flooding in fracture cave reservoir
Poorly conductive, thus the apparant formation water resistivity R of oily intervalwaThan the apparant formation water resistivity of water-bearing interval
RwaGreatly, therefore, the fluid type that can be used to identify crack-hole (hole) type reservoir depending on formation resistivity.
S403, the fluid type that the reservoir is identified according to the apparant formation water resistivity.
Wherein, when the apparant formation water resistivity is more than predetermined threshold value, the stream that the fluid type is oily is determined
Body；When the apparant formation water resistivity is not more than predetermined threshold value, it is aqueous fluid to determine the fluid type.
In conclusion the present embodiment is solved after being drilled out due to the reservoir of carbonate rock, mud filtrate intrusion permeability
Stratum, the resistivity of mud filtrate is different from the resistivity of the original pore-fluid of rock, causes invaded zone resistivity former with stratum
Beginning resistivity is different, the problem of being judged by accident with Logging Data To Evaluate formation fluid classification, eliminates slurry compounding to reservoir
The influence of class of fluids identification improves the accuracy of reservoir fluid classification identification.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its according to
Can so modify to the technical solution recorded in foregoing embodiments either to which part or all technical features into
Row equivalent replacement；And these modifications or replacement, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (6)
- A kind of 1. fluid identification of reservoir method, which is characterized in that including：According to On Dual-Lateral Log response equation and well-log information to be logged well, the very electricity of reservoir to be logged well described in acquisition Resistance rate；According to the true resistivity of the reservoir and the porosity of the reservoir, apparant formation water resistivity is obtained；The fluid type of the reservoir is identified according to the apparant formation water resistivity.
- 2. according to the method described in claim 1, it is characterized in that, when it is described when well logging for inclined shaft or horizontal well when, it is described Method further includes：Resistivity anisotropy correction coefficient λ is obtained according to the well-log information of statistics；The well-log information to be logged well according to resistivity anisotropy correction coefficient λ corrections；It is described according to On Dual-Lateral Log response equation and well-log information to be logged well, reservoir to be logged well described in acquisition True resistivity, including：The well-log information to be logged well according to after On Dual-Lateral Log response equation and correction is treated described in acquisition The true resistivity of the reservoir of well logging.
- It is 3. according to the method described in claim 2, it is characterized in that, described according to the resistivity anisotropy correction coefficient λ Well-log information to be logged well described in correction, including：According toCalculate the apparent resistivity R of the reservoir to be logged well after obtaining correctionh'；Wherein, θ ' is the hole angle of the oil well, Ra' apparent resistivity for the reservoir before correcting in the well-log information, λ is electricity Resistance rate anisotropy correction coefficient corrects.
- 4. according to the method described in claim 1-3 any one, which is characterized in that described to be responded according to On Dual-Lateral Log Equation and well-log information to be logged well, the true resistivity of reservoir to be logged well described in acquisition, including：According to deep lateral log response equationIt is responded with shallow lateral logging EquationInversion Calculation obtains the true resistivity of the reservoir；Wherein, RdaFor the deep lateral log response that deep lateral log response equation calculates, RsaFor shallow lateral logging response equation The shallow lateral logging response of calculating, Ud、UsMonitor electrode M during for depth laterolog1The potential at place, PdiWith PsiFor corresponding electricity Pole bucking current or principal current, UdiAnd UsiFor single columnar electrode cylindricality boundary condition solution, a be instrument radius, ρ0For well Eye radius, ρ1For average invaded zone depth, RmFor mud resistivity, RxoFor average invaded zone resistivity, RtFor stratum initial resistance Rate, KdFor deep lateral log K factor, I0For main electrode current, KsFor deep lateral log K factor.
- 5. according to the method described in claim 4, it is characterized in that, the true resistivity according to the reservoir and the reservoir Porosity, obtain apparant formation water resistivity, including：Using formulaIt calculates and obtains the apparant formation water resistivity Rwa；Wherein, φ is the porosity of the reservoir,True resistivity for the reservoir.
- 6. according to the method described in claim 5, it is characterized in that, described identify the storage according to the apparant formation water resistivity The fluid type of layer, including：When the apparant formation water resistivity is more than predetermined threshold value, the fluid that the fluid type is oily is determined；When the apparant formation water resistivity is not more than predetermined threshold value, it is aqueous fluid to determine the fluid type.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707378A (en) * | 2019-02-20 | 2019-05-03 | 西北大学 | A low-resistance oil layer identification method based on mud invasion characteristics and vertical comparison |
| CN112228049A (en) * | 2020-09-30 | 2021-01-15 | 核工业二〇八大队 | Measuring method for ground leaching process drill hole |
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| CN112228049A (en) * | 2020-09-30 | 2021-01-15 | 核工业二〇八大队 | Measuring method for ground leaching process drill hole |
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