CN109781600A - A kind of water logging rock core saturation degree category correction method - Google Patents
A kind of water logging rock core saturation degree category correction method Download PDFInfo
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Abstract
The invention discloses a kind of water logging rock core saturation degree category correction methods, comprising the following steps: 1) chooses the influence factor of water flooding degree and reservoir properties as closed core analysis saturation degree；2) rock core is divided by strong water logging rock core and weak water logging rock core according to water flooding degree；3) reservoir properties classification is carried out to strong water logging rock core and weak water logging rock core respectively；4) classification of saturation degree loss amount is carried out to the rock core of different water flooding degrees, different reservoir physical property classification, and then every a kind of saturation degree loss amount is fitted, linear equation is obtained, then obtains the slope and intercept of linear equation；5) slope of the linear equation obtained according to step 4) and intercept calculate original rock core water containing saturability and oil saturation, and this method can accurately obtain original rock core water containing saturability and oil saturation, and have a wide range of application.
Description
Technical field
The invention belongs to petroleum well logging technology fields, are related to a kind of water logging rock core saturation degree category correction method.
Background technique
Major part waterflooding oil field exists to the tail period stage at present washes phenomenon, and deployment washing inspection shaft carries out
Coring research washing rule becomes essential means, and the limitation of traditional rock core correction analytical method is primarily present following
Several aspects:
1, closed pressure retaining technology is used during coring, keeps the reset condition of rock core as far as possible, it in this way can be from
Guarantee the accuracy of core test on source, but closed coring drilling with keep up pressure is with high costs.
It 2, is to utilize empirical equation and related plate based on the indirect determining method of well-log information and core hole analysis of data,
Oil reservoir initial oil saturation value is obtained indirectly, since the application of empirical equation and plate has a limitation more, therefore this method
Precision is lower relative to rock core direct measuring method.
3, capillary pressure curve calculating method is the reservoir formation process based on laboratory simulation oil expelling water, and what is measured is fluid
The relation curve of saturation degree and capillary pressure determines oil reservoir initial oil saturation using laboratory capillary pressure data.In recent years
Come, much oily area applies capillary pressure curve calculating method to determine initial oil saturation in China, and some areas, which also achieve, compares
Satisfied result, but due to being difficult to ask oil-water boundary tension and wetting contact angle under quasi- reservoir condition, at present can only be
Low level reserves use in calculating.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, a kind of water logging rock core saturation degree classification school is provided
Correction method, this method can accurately obtain original rock core water containing saturability and oil saturation, and have a wide range of application.
In order to achieve the above objectives, water logging rock core saturation degree category correction method of the present invention the following steps are included:
1) influence factor of water flooding degree and reservoir properties as closed core analysis saturation degree is chosen；
2) rock core is divided by strong water logging rock core and weak water logging rock core according to water flooding degree；
3) reservoir properties classification is carried out to strong water logging rock core and weak water logging rock core respectively；
4) classification of saturation degree loss amount is carried out to the rock core of different water flooding degrees, different reservoir physical property classification, it is then right
Every one kind saturation degree loss amount is fitted, and is obtained linear equation, is then obtained the slope and intercept of linear equation；
5) slope of the linear equation obtained according to step 4) and intercept calculate original rock core water containing saturability and oil-containing is full
And degree.
The concrete operations of step 2) are as follows:
Using array induction logging curve, as the regular R that array induction logging curve meets10>R20>R30≈R60≈R90For
When negative variance feature, corresponding rock core fluorescence thin section is described as faint disseminated fluorescence, and aqueous more apparent in rock, then the rock core is
Strong Water Flooding Layer；When array induction logging curve meets R10>R20>R30< R60< R90, fluorescence thin section is described as filling in hole oily
Matter pitch, pitch dip dyeing is more universal, and a small amount of water is contained in hole, then this layer of rock core is weak Water Flooding Layer or non-Water Flooding Layer.
The concrete operations of step 3) are as follows: respectively by the reservoir properties of strong water logging rock core and weak water logging rock core be I class, II class and
Group III, wherein reservoir properties classification uses moving cell index FZI；
Rock physics porosity, permeability, median grain diameter, shale content and Flow Zone Index FZI value characterization,
Under the conditions of pore throat characteristic is similar, different flow units can due to geologic feature variation and exist, Kozeny and Carmen
Using the concept of average Hydraulic Unit radius, interstitial space is considered as a series of capillary, according to Poisscuille and
Darcy law establishes the Kozeny-Carman of porosity and permeability relationship between characterizing different flow units:
Wherein, k is permeability,For effecive porosity, FSFor the pore geometry factor, sgvFor the ratio table of unit particle
Face, τ are the curvature of flow path；
Enabling FZI is Kozeny constant, and
It is obtained by formula (1) and formula (2)
The concrete operations of step 5) are as follows:
In water-oil phase system, when only existing oil and water two-phase fluid in reservoir, there are formula (4) institutes between saturation degree
The relationship shown:
SW is real+SO is real=1 (4)
After decompression degassing, grease saturation degree is unsatisfactory for formula (4), and water saturation correction factor A and oily saturation degree need to be added
Correction factor B；
Enable SW=S 'WA, SO=S 'OB then has:
S′W·A+S′OB=1 (5)
Formula (5) is converted, linear equation is obtained:
Wherein, SW is realAnd SO is realFor original aqueous and oil saturation, S 'WAnd S 'OAqueous and oil-containing saturation is measured for rock core
Degree；
Reservoir Classification is carried out according to different water flooded grades, reservoir properties and the saturation degree extent of damage, then in similar storage
S ' is fitted in layerWWith S 'OLinear equation, by S 'WWith S 'OLinear equation slope and intercept substitute into formula (6) in, must be somebody's turn to do
The correction coefficient A and B of class reservoir obtain reservoir original oil water saturation using normalized.
If the accounting of oily loss amount is λ in saturation data total losses amount, then water saturation data degradation amount is 1- λ, then
The formula of normalized are as follows:
So=(1-SO is real-SW is real)×λ+SO is real (7)
SW=(1-SO is real-SW is real)×(1-λ)+SW is real (8)
Wherein, λ are as follows:
Wherein, SW is realAnd SO is realTo normalize preceding calculated original aqueous, oil saturation, λ is oil loss in total losses amount
Measure proportion, S 'WAnd S 'OAqueous, oil saturation is measured for rock core.
The invention has the following advantages:
Water logging rock core saturation degree category correction method of the present invention chooses water flooding degree and reservoir when specific operation
Influence factor of the physical property as closed core analysis saturation degree, and to the rock to different water flooding degrees, different reservoir physical property classification
The heart carries out the classification of saturation degree loss amount, is then fitted to every a kind of saturation degree loss amount, obtains linear equation, last basis
The slope and intercept of linear equation calculate original rock core water containing saturability and oil saturation, convenient and simple for operation, comprehensively consider
The influence of reservoir properties and water flooding degree, so that accurate saturation parameters are obtained, to meet actual needs.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is rock core saturation degree loss amount in the present invention with the change curve of core analysis porosity；
Fig. 3 is rock core saturation degree loss amount in the present invention with the change curve of horizontal permeability；
Fig. 4 is rock core water flooding degree classification chart in the present invention；
Fig. 5 is water logging rock core saturation degree category correction figure in the present invention.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
With reference to Fig. 1, water logging rock core saturation degree category correction method of the present invention the following steps are included:
1) influence factor of water flooding degree and reservoir properties as closed core analysis saturation degree is chosen；
The phenomenon that waterflooded reservoir increases with water flooding degree, and water saturation error is in " small at both ends and big in the middle ", water logging journey
Higher rock core is spent, remaining oil saturation is lower, and dissolved gas is less, and decompression deaeration capacity is weaker.And for water flooding degree compared with
Low rock core, for the water in hole based on irreducible water, movable water content is too low, and decompression deaeration capacity is not also strong.Only in water logging
When degree is more medium, oil saturation is relatively high, and has sufficient moveable water, and decompression deaeration capacity is most strong, therefore, if
Category correction is not carried out according to water flooding degree, can give and correction result is caused to bring biggish error.
Obtain that physical property is better, and saturation degree loss amount is bigger according to target area core analyzing data, in the preferable reservoir of physical property,
Macrovoid accounts for that total void ratio is higher, and for the water in hole based on moveable water, the water of decompression degassing discharge is more；And in physical property
In poor reservoir, irreducible water saturation is larger, and grease mobility is relatively poor, and water discharge quantity is also just reduced therewith, therefore,
Need to consider influence caused by reservoir properties difference during saturation correction.
2) rock core is divided by strong water logging rock core and weak water logging rock core according to water flooding degree；
The concrete operations of step 2) are as follows:
Using array induction logging curve, as the regular R that array induction logging curve meets10>R20>R30≈R60≈R90For
When negative variance feature, corresponding rock core fluorescence thin section is described as faint disseminated fluorescence, and aqueous more apparent in rock, then the rock core is
Strong Water Flooding Layer；When array induction logging curve meets R10>R20>R30< R60< R90, fluorescence thin section is described as filling in hole oily
Matter pitch, pitch dip dyeing is more universal, and a small amount of water is contained in hole, then this layer of rock core is weak Water Flooding Layer or non-Water Flooding Layer.
3) reservoir properties classification is carried out to strong water logging rock core and weak water logging rock core respectively；
The concrete operations of step 3) are as follows: respectively by the reservoir properties of strong water logging rock core and weak water logging rock core be I class, II class and
Group III, reference table 1, wherein reservoir properties classification uses moving cell index FZI；
Table 1
| Reservoir levels | Porosity (%) | Air permeability (10-3μm2) | RQI(μm) | Lithology |
| I | 17-21 | 70-800 | >1.5 | Medium coarse sand rock, glutenite |
| Ⅱ | 9-19 | 1-80 | 0.9-1.5 | Packsand |
| Ⅲ | 6-14 | 0.05-1 | <0.9 | Argillaceous siltstoue, siltstone |
High water cut can concentrated expression reservoir deposition, diagenesis, Late reformation the effects of, rock physics under normal circumstances
Property with porosity, permeability, median grain diameter, shale content and Flow Zone Index FZI value characterize, wherein median grain diameter and
Shale content is mainly able to reflect out reservoir rock phase character, and porosity and permeability are mainly able to reflect out reservoir properties spy
Sign, Flow Zone Index FZI value can reflect out Microstructure of Reservoirs in terms of feature.
Under the conditions of pore throat characteristic is similar, different flow units can due to geologic feature variation and exist, Kozeny
With the concept of the average Hydraulic Unit radius of Carmen application, interstitial space is considered as a series of capillary, according to
Poisscuille and Darcy law establishes the Kozeny- of porosity and permeability relationship between characterizing different flow units
Carman:
Wherein, k is permeability,For effecive porosity, FSFor the pore geometry factor, sgvFor the ratio table of unit particle
Face, τ are the curvature of flow path；
Enabling FZI is Kozeny constant, and
It is obtained by formula (1) and formula (2)
FZI is the constant of a variation between different element of fluid, but is one in a determining element of fluid
Fixed is normal, as it is a kind of can in the plane with it is vertical on mark off with continuous, similar permeability reservoir units
Actual parameter is able to reflect the size of different type reservoir saturation degree loss amount.
4) classification of saturation degree loss amount is carried out to the rock core of different water flooding degrees, different reservoir physical property classification, it is then right
Every one kind saturation degree loss amount is fitted, and is obtained linear equation, is then obtained the slope and intercept of linear equation；
5) slope of the linear equation obtained according to step 4) and intercept calculate original rock core water containing saturability and oil-containing is full
And degree.
The concrete operations of step 5) are as follows:
In water-oil phase system, when only existing oil and water two-phase fluid in reservoir, there are formula (4) institutes between saturation degree
The relationship shown:
SW is real+SO is real=1 (4)
After decompression degassing, grease saturation degree is unsatisfactory for formula (4), and water saturation correction factor A and oily saturation degree need to be added
Correction factor B；
Enable SW=S 'WA, SO=S 'OB then has:
S′W·A+S′OB=1 (5)
Formula (5) is converted, linear equation is obtained:
Wherein, SW is realAnd SO is realFor original aqueous and oil saturation, S 'WAnd S 'OAqueous and oil-containing saturation is measured for rock core
Degree；
Reservoir Classification is carried out according to different water flooded grades, reservoir properties and the saturation degree extent of damage, then in similar storage
S ' is fitted in layerWWith S 'OLinear equation, by S 'WWith S 'OLinear equation slope and intercept substitute into formula (6) in, must be somebody's turn to do
The correction coefficient A and B of class reservoir obtain reservoir original oil water saturation using normalized.
Wherein, if the accounting of oily loss amount is λ in saturation data total losses amount, then water saturation data degradation amount is 1-
λ, the then formula of normalized are as follows:
So=(1-SO is real-SW is real)×λ+SO is real (7)
SW=(1-SO is real-SW is real)×(1-λ)+SW is real (8)
Wherein, λ are as follows:
Wherein, SW is realAnd SO is realTo normalize preceding calculated original aqueous, oil saturation, λ is oil loss in total losses amount
Measure proportion, S 'WAnd S 'OAqueous, oil saturation is measured for rock core.
It corrects product test: using the present invention, saturation correction being carried out to whole district's sealed coring well rock core, for verifying correction
As a result accuracy, the present invention propose water logging index (Flooded Index), and water logging index is that the crude oil volume of extraction is (movable
Water volume) with the ratio of movable oil volume, the expression formula of water logging index (referred to as FLI) are as follows:
Wherein, SoFor remaining oil oil saturation, SooFor initial oil saturation, SorFor residual oil saturation.
By calculated result compared with formation testing conclusion, reference table 2, as a result surface, coincidence rate is higher, can satisfy practical oil field
Exploitation needs.
Table 2
Claims (6)
1. a kind of water logging rock core saturation degree category correction method, which comprises the following steps:
1) influence factor of water flooding degree and reservoir properties as closed core analysis saturation degree is chosen；
2) rock core is divided by strong water logging rock core and weak water logging rock core according to water flooding degree；
3) reservoir properties classification is carried out to strong water logging rock core and weak water logging rock core respectively；
4) classification that saturation degree loss amount is carried out to the rock core of different water flooding degrees, different reservoir physical property classification, then to each
Class saturation degree loss amount is fitted, and obtains linear equation, then obtains the slope and intercept of linear equation；
5) slope of the linear equation obtained according to step 4) and intercept calculate original rock core water containing saturability and oil saturation.
2. water logging rock core saturation degree category correction method according to claim 1, which is characterized in that the specific behaviour of step 2)
As:
Using array induction logging curve, as the regular R that array induction logging curve meets10>R20>R30≈R60≈R90For minus tolerance
When different feature, corresponding rock core fluorescence thin section is described as faint disseminated fluorescence, and aqueous more apparent in rock, then the rock core is Qiang Shui
Flood layer；When array induction logging curve meets R10>R20>R30< R60< R90, fluorescence thin section be described as in hole fill oil drip
Blueness, pitch dip dyeing is more universal, and a small amount of water is contained in hole, then this layer of rock core is weak Water Flooding Layer or non-Water Flooding Layer.
3. water logging rock core saturation degree category correction method according to claim 1, which is characterized in that the specific behaviour of step 3)
As: it is respectively I class, II class and Group III by the reservoir properties of strong water logging rock core and weak water logging rock core, wherein reservoir properties point
Class uses moving cell index FZI.
4. water logging rock core saturation degree category correction method according to claim 1, which is characterized in that rock physics hole
Porosity, permeability, median grain diameter, shale content and Flow Zone Index FZI value characterization, in the similar condition of pore throat characteristic
Under, different flow units can due to geologic feature variation and exist, Kozeny and the average Hydraulic Unit of Carmen application half
Interstitial space is considered as a series of capillary by the concept of diameter, and according to Poisscuille and Darcy law, it is different to establish characterization
The Kozeny-Carman of porosity and permeability relationship between flow unit:
Wherein, k is permeability,For effecive porosity, FSFor the pore geometry factor, sgvFor the specific surface of unit particle, τ
For the curvature of flow path；
Enabling FZI is Kozeny constant, and
It is obtained by formula (1) and formula (2)
5. water logging rock core saturation degree category correction method according to claim 1, which is characterized in that the specific behaviour of step 5)
As:
In water-oil phase system, when only existing oil and water two-phase fluid in reservoir, there are shown in formula (4) between saturation degree
Relationship:
SW is real+SO is real=1 (4)
After decompression degassing, grease saturation degree is unsatisfactory for formula (4), and water saturation correction factor A and oily saturation correction need to be added
Factor B；
Enable SW=S 'WA, SO=S 'OB then has:
S′W·A+S′OB=1 (5)
Formula (5) is converted, linear equation is obtained:
Wherein, SW is realAnd SO is realFor original aqueous and oil saturation, S 'WAnd S 'OAqueous and oil saturation is measured for rock core；
Reservoir Classification is carried out according to different water flooded grades, reservoir properties and the saturation degree extent of damage, then in similar reservoir
Fit S 'WWith S 'OLinear equation, by S 'WWith S 'OLinear equation slope and intercept substitute into formula (6) in, obtain such storage
The correction coefficient A and B of layer obtain reservoir original oil water saturation using normalized.
6. water logging rock core saturation degree category correction method according to claim 1, which is characterized in that
If the accounting of oily loss amount is λ in saturation data total losses amount, then water saturation data degradation amount is 1- λ, then normalizing
Change the formula of processing are as follows:
So=(1-SO is real-SW is real)×λ+SO is real (7)
SW=(1-SO is real-SW is real)×(1-λ)+SW is real (8)
Wherein, λ are as follows:
Wherein, SW is realAnd SO is realTo normalize preceding calculated original aqueous, oil saturation, λ is oily loss amount institute in total losses amount
Accounting example, S 'WAnd S 'OAqueous, oil saturation is measured for rock core.
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| CN112710806A (en) * | 2019-10-25 | 2021-04-27 | 中国石油化工股份有限公司 | Correction method for sandstone oil reservoir coring saturation |
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| CN112710806A (en) * | 2019-10-25 | 2021-04-27 | 中国石油化工股份有限公司 | Correction method for sandstone oil reservoir coring saturation |
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Application publication date: 20190521 |