CN109031436A - A kind of hypotonic loose sand reservoir water saturation evaluation method of low-resistance based under Reservoir Classification - Google Patents
A kind of hypotonic loose sand reservoir water saturation evaluation method of low-resistance based under Reservoir Classification Download PDFInfo
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Abstract
The invention discloses a kind of hypotonic loose sand reservoir water saturation evaluation methods of low-resistance based under Reservoir Classification, are related to oil-gas exploration and development field field, include the following steps: that core porosity, permeability data obtain；Rock core litho-electric parameters obtain；The determination of Reservoir Classification；The determination of every one kind reservoir litho-electric parameters, the calculating of water saturation.The present invention can significantly improve the precision of low-resistance low permeability reservoir saturation curves calculating, and the model calculation is accurate, applied widely.
Description
Technical field
The invention belongs to oil-gas exploration and development fields, and in particular to based on the hypotonic loose sand storage of low-resistance under Reservoir Classification
Layer water saturation evaluation method provides foundation for the hypotonic loose sand reservoir saturation degree evaluation of low-resistance.
Background technique
Zhujiangkou Basin Zhujiang River group reservoir is the hypotonic loose sand reservoir of low-resistance, has shale weight, bound water content height, object
Property is poor, in the feature of low hole and complex pore structure, the height of shale content has reservoir permeability and irreducible water saturation non-
Often big influence is evaluated using conventional saturation degree evaluating method and is often difficult to determine the true saturation degree in stratum, in turn
Finimeter is caused not calculated accurately, fluid properties differentiate and capability forecasting is difficult.
At this stage, Zhujiangkou Basin Qionghai uplift Zhujiang River group low-resistance low permeability reservoir is sought using conventional Indonesia formula, and simultaneously
Reservoir Classification is not carried out, and through counting, the saturation degree and sealing core drilling calculated using the method, which calculates saturation degree, certain error.
Summary of the invention
The purpose of the present invention is statuses in view of the above technology, it is intended to hypotonic for Zhujiangkou Basin Qionghai uplift Zhujiang River group low-resistance
Reservoir provides a kind of method that accurate reliable water saturation curve calculates, and improves geologic assessment accuracy.
The implementation of the object of the invention is, a kind of aqueous full based on the hypotonic loose sand reservoir of low-resistance under Reservoir Classification
With degree evaluation method, technical scheme is as follows:
1) core porosity, permeability data obtain: choosing enough and have the representative core sample of reservoir, to rock
The heart carries out conventional Physical Property Analysis, obtains core porosity, permeability data；
2) rock core litho-electric parameters obtain: choosing enough and have the representative core sample of reservoir, carry out rock to rock core
Electrical parameter experiment, obtains the litho-electric parameters of rock core；
3) determination of Reservoir Classification: formula is usedCalculate the flowing of each core data
Unit according to geologic information and chooses reliable mathematical method to core data progress Reservoir Classification；It is sought according to well-log information
The Reservoir Classification result of each depth of purpose well；
In formula: FZI-flow unit classification, dimensionless；
RQI-reservoir quality factor, μm；
- standardization porosity, dimensionless；
K-core analysis permeability, mD；
Φ-core analysis porosity, %；
4) every a kind of reservoir free flow the determination of every a kind of reservoir litho-electric parameters: is sought according to the fitting of Reservoir Classification result
The cementation factor and lithologic index of body, capillary and clay water；
5) according to formulaAnd reservoir
Classification results and classification litho-electric parameters are as a result, seek the water saturation of each depth point of purpose well；
In formula: PORC-clay water pore degree, decimal, calculation formula:
PORI-hollow billet water pore volume, decimal, calculation formula: PORL=Swb*PORT-PORC；
PORF-free fluid porosity, decimal, calculation formula: PORF=PORT-Swb*PORT；
PORT-stratum total porosity, decimal；
Rt- ground layer depth resistivity, Ω .m；
Sw- stratum water saturation, decimal；
Swb- stratum irreducible water saturation, decimal；
Φf、Φi、Φc- it is respectively free fluid, capillary and clay water pore degree, decimal；
mf、mi、mc- be respectively free fluid, capillary and clay water cementation factor, decimal；
af、ai、ac- be respectively free fluid, capillary and clay water lithologic index, decimal；
N-reservoir saturation exponent, decimal；
Rwf、Rwi、Rwc- it is respectively free fluid, capillary and clay water resistivity, Ω .m；
SwfThe water saturation of-free fluid, decimal；
Vcl- stratum clay content, decimal；
ρclThe density of-damp clay, g/cm3；
ρdclThe density of-dry clay, g/cm3；
ρcwThe density of-clay water, g/cm3。
Compared with prior art, beneficial effects of the present invention are as follows:
The present invention can significantly improve the precision of low-resistance low permeability reservoir saturation curves calculating, the model calculation is accurate,
It is applied widely.
It is very good that water saturation evaluation result of the present invention is coincide with sealing core drilling saturation degree, and the present invention is in THE WESTERN SOUTH CHINA SEA sea
Domain calculates more than 20 well of water saturation curve, and fluid identification coincidence rate reaches 90%, can preferably meet geological research needs.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of hypotonic loose sand reservoir water saturation evaluation method of low-resistance based under Reservoir Classification of the present invention
Real work process detail drawing；
Fig. 2 is a kind of hypotonic loose sand reservoir water saturation evaluation method of low-resistance based under Reservoir Classification of the present invention
W13 Oilfield Flowing unit Reservoir Classification result；
Fig. 3 is a kind of hypotonic loose sand reservoir water saturation evaluation method of low-resistance based under Reservoir Classification of the present invention
The porosity and formation factor cross plot of the oil field W13 different reservoir type；
Fig. 4 is a kind of hypotonic loose sand reservoir water saturation evaluation method of low-resistance based under Reservoir Classification of the present invention
The saturation exponent and water saturation cross plot of the oil field W13 different reservoir type；
Fig. 5 is a kind of hypotonic loose sand reservoir water saturation evaluation method of low-resistance based under Reservoir Classification of the present invention
Application achievements figure.
Specific embodiment
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
1) core porosity, permeability data obtain: choosing enough and have the representative core sample of reservoir, to rock
The heart carries out conventional Physical Property Analysis, obtains core porosity, permeability data；
2) rock core litho-electric parameters obtain: choosing enough and have the representative core sample of reservoir, carry out rock to rock core
Electrical parameter experiment, obtains the litho-electric parameters of rock core；
3) determination of Reservoir Classification: formula is usedCalculate the flowing list of each core data
Member according to geologic information and chooses reliable mathematical method to core data progress Reservoir Classification；Mesh is sought according to well-log information
Well each depth Reservoir Classification result；
In formula: FZI-flow unit classification, dimensionless；
RQI-reservoir quality factor, μm；
- standardization porosity, dimensionless；
K-core analysis permeability, mD；
Φ-core analysis porosity, %.
4) every a kind of reservoir free flow the determination of every a kind of reservoir litho-electric parameters: is sought according to the fitting of Reservoir Classification result
The cementation factor and lithologic index of body, capillary and clay water, steps are as follows:
1, using porosity cutoff as boundary, when porosity is less than lower limit, under log-log coordinate, the relationship of F- Φ is returned,
Slope is mi, intercept ai；When porosity is greater than lower limit, under log-log coordinate, the relationship of F- Φ, slope m are returnedf, intercept
For af；The a of clay holecAnd mcTake empirical value, respectively 1.4 and 1.6~1.8 (see Fig. 3)；
The cementation factor based on Reservoir Classification in the oil field A13 of the present invention are as follows: A class reservoir ai=1.0, mi=1.62, af=
1.0, mf=1.323；B class reservoir ai=1.0, mi=1.531, af=1.0, mf=1.431；C class reservoir ai=1.02, mi=
1.422 af=1.0, mf=1.532.
2, under linear coordinate, I-Sw relationship, slope n are returned, intercept is b (see Fig. 4)；
The lithologic index based on Reservoir Classification in the oil field A13 of the present invention are as follows: A class reservoir b=1.0, n=1.615；The storage of B class
Layer b=1.0, n=1.712；C class reservoir b=1.0, n=2.162.
5) according to formulaAnd reservoir
Classification results and classification litho-electric parameters are as a result, seek the water saturation of each depth point of purpose well (see Fig. 5)；In formula:
PORC-clay water pore degree, decimal, calculation formula:
PORI-hollow billet water pore volume, decimal, calculation formula: PORL=Swb*PORT-PORC；
PORF-free fluid porosity, decimal, calculation formula: PORF=PORT-Swb*PORT；
PORT-stratum total porosity, decimal.
Rt- ground layer depth resistivity, Ω .m；
Sw- stratum water saturation, decimal；
Swb- stratum irreducible water saturation, decimal；
Φf、Φi、Φc- it is respectively free fluid, capillary and clay water pore degree, decimal；
mf、mi、mc- be respectively free fluid, capillary and clay water cementation factor, decimal；
af、ai、ac- be respectively free fluid, capillary and clay water lithologic index, decimal；
N-reservoir saturation exponent, decimal；
Rwf、Rwi、Rwc- it is respectively free fluid, capillary and clay water resistivity, Ω .m；
SwfThe water saturation of-free fluid, decimal；
Vcl- stratum clay content, decimal；
ρclThe density of-damp clay, g/cm3；
ρdclThe density of-dry clay, g/cm3；
ρcwThe density of-clay water, g/cm3。
A kind of hypotonic loose sand reservoir water saturation evaluation side of low-resistance based under Reservoir Classification of the present invention
Method can significantly improve the precision of low-resistance low permeability reservoir saturation curves calculating, and the model calculation is accurate, applied widely,
It is very good that water saturation evaluation result of the present invention is coincide with sealing core drilling saturation degree, and the present invention calculates in THE WESTERN SOUTH CHINA SEA sea area to be contained
More than 20 well of water saturation curve, fluid identification coincidence rate reaches 90%, can preferably meet geological research needs.
A kind of hypotonic loose sand reservoir of low-resistance based under Reservoir Classification now proposed through the invention contains water saturation
It spends evaluation method and certain market common method carries out Experimental Comparison, test process is as follows；
1, the hypotonic loose sand reservoir water saturation of low-resistance is evaluated using two methods respectively and low-resistance is hypotonic
Reservoir saturation curves calculate, and then carry out two-way comparison, precision difference can be obtained.
2, the hypotonic loose sand reservoir water saturation of low-resistance is evaluated using two methods respectively and low-resistance is hypotonic
Cooperation model calculates after reservoir saturation curves calculate, and then carries out two-way comparison, the difference of accuracy rate can be obtained.
3, by calculating more than 20 well of water saturation curve in THE WESTERN SOUTH CHINA SEA sea area, fluid coincidence rate is compared.
Test data is as follows:
| Precision/% | Accuracy rate/% | Fluid coincidence rate/% | |
| Embodiment 1 | ≥72 | ≥63 | 89% |
| Reinspection | ≥73 | ≥69 | 88% |
| Comparative example 1 | ≥94.9 | ≥96 | 97.8% |
It is a kind of aqueous based on the hypotonic loose sand reservoir of low-resistance under Reservoir Classification made by the present invention through Experimental comparison
Saturation degree evaluating method has the characteristics that precision is high, accuracy rate is done, fluid coincidence rate is high.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention, for this field skill
For art personnel, it is clear that invention is not limited to the details of the above exemplary embodiments, and without departing substantially from spirit of the invention or
In the case where essential characteristic, the present invention can be realized in other specific forms.Therefore, in all respects, should all incite somebody to action
Embodiment regards exemplary as, and is non-limiting, the scope of the present invention by appended claims rather than on state
Bright restriction, it is intended that including all changes that fall within the meaning and scope of the equivalent elements of the claims in the present invention
It is interior.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (1)
1. a kind of hypotonic loose sand reservoir water saturation evaluation method of low-resistance based under Reservoir Classification, it is characterised in that tool
Body step are as follows:
S1, core porosity, permeability data obtain: choosing enough and have the representative core sample of reservoir, to rock core
Conventional Physical Property Analysis is carried out, core porosity, permeability data are obtained；
S2, rock core litho-electric parameters obtain: choosing enough and have the representative core sample of reservoir, carry out rock electricity ginseng to rock core
Number experiment, obtains the litho-electric parameters of rock core；
The determination of S3, Reservoir Classification: formula is usedThe flow unit of each core data is calculated,
According to geologic information and reliable mathematical method is chosen to core data progress Reservoir Classification；Purpose well is sought according to well-log information
The Reservoir Classification result of each depth；
In formula: FZI-flow unit classification, dimensionless；
RQI-reservoir quality factor, μm；
- standardization porosity, dimensionless；
K-core analysis permeability, mD；
Φ-core analysis porosity, %；
The determination of S4, every a kind of reservoir litho-electric parameters: every a kind of reservoir free fluid, hair are sought according to the fitting of Reservoir Classification result
The cementation factor and lithologic index of pipe water and clay water；
S5, according to formula And Reservoir Classification knot
Fruit and classification litho-electric parameters are as a result, seek the water saturation of each depth point of purpose well；
In formula: PORC-clay water pore degree, decimal, calculation formula:
PORI-hollow billet water pore volume, decimal, calculation formula: PORL=Swb*PORT-PORC；
PORF-free fluid porosity, decimal, calculation formula: PORF=PORT-Swb*PORT；
PORT-stratum total porosity, decimal；
Rt- ground layer depth resistivity, Ω .m；
Sw- stratum water saturation, decimal；
Swb- stratum irreducible water saturation, decimal；
Φf、Φi、Φc- it is respectively free fluid, capillary and clay water pore degree, decimal；
mf、mi、mc- be respectively free fluid, capillary and clay water cementation factor, decimal；
af、ai、ac- be respectively free fluid, capillary and clay water lithologic index, decimal；
N-reservoir saturation exponent, decimal；
Rwf、Rwi、Rwc- it is respectively free fluid, capillary and clay water resistivity, Ω .m；
SwfThe water saturation of-free fluid, decimal；
Vcl- stratum clay content, decimal；
ρclThe density of-damp clay, g/cm3；
ρdclThe density of-dry clay, g/cm3；
ρcwThe density of-clay water, g/cm3。
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| CN110160927A (en) * | 2019-05-16 | 2019-08-23 | 中海油田服务股份有限公司 | A kind of method and device of determining irreducible water saturation |
| CN111485874A (en) * | 2019-01-28 | 2020-08-04 | 中国石油天然气股份有限公司 | Method and device for determining water saturation of horizontal well reservoir |
| CN114386881A (en) * | 2022-03-22 | 2022-04-22 | 中国石油大学(华东) | Medium-high permeability oil and gas reservoir sand production mode division and solid control and management method |
| CN116338812A (en) * | 2023-05-26 | 2023-06-27 | 成都理工大学 | Method for determining upper limit of water saturation of gas reservoir |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111485874A (en) * | 2019-01-28 | 2020-08-04 | 中国石油天然气股份有限公司 | Method and device for determining water saturation of horizontal well reservoir |
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| CN114386881A (en) * | 2022-03-22 | 2022-04-22 | 中国石油大学(华东) | Medium-high permeability oil and gas reservoir sand production mode division and solid control and management method |
| CN114386881B (en) * | 2022-03-22 | 2022-06-10 | 中国石油大学(华东) | Medium-high permeability oil and gas reservoir sand production mode division and solid control and management method |
| CN116338812A (en) * | 2023-05-26 | 2023-06-27 | 成都理工大学 | Method for determining upper limit of water saturation of gas reservoir |
| CN116338812B (en) * | 2023-05-26 | 2023-08-11 | 成都理工大学 | Method for determining upper limit of water saturation of gas reservoir |
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