CN106198345A - Reservoir evaluation method - Google Patents
Reservoir evaluation method Download PDFInfo
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- CN106198345A CN106198345A CN201610529215.1A CN201610529215A CN106198345A CN 106198345 A CN106198345 A CN 106198345A CN 201610529215 A CN201610529215 A CN 201610529215A CN 106198345 A CN106198345 A CN 106198345A
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- 238000011156 evaluation Methods 0.000 title claims abstract description 27
- 239000011148 porous material Substances 0.000 claims abstract description 84
- 230000035699 permeability Effects 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000001764 infiltration Methods 0.000 claims description 2
- 230000008595 infiltration Effects 0.000 claims description 2
- 241000208340 Araliaceae Species 0.000 claims 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 1
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 1
- 235000008434 ginseng Nutrition 0.000 claims 1
- 230000000877 morphologic effect Effects 0.000 abstract description 9
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000000418 atomic force spectrum Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 206010034719 Personality change Diseases 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000000547 structure data Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
- G01N15/0886—Mercury porosimetry
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- Chemical & Material Sciences (AREA)
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- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a reservoir evaluation method, relates to the technical field of reservoir evaluation, and aims to solve the problem that in the prior art, the reservoir evaluation directly carried out through the morphological characteristics of capillary pressure curves is limited in practice. The method comprises the following steps: determining a relational expression between the permeability and the porosity and pore structure parameters according to experimental data of the porosity, the permeability and the pore structure parameters of different reservoirs; defining a pore throat matching coefficient, and determining a relational expression between the pore throat matching coefficient and the porosity and permeability; acquiring the porosity and permeability of different reservoirs, and acquiring pore throat ratio coefficients of the corresponding reservoirs; and obtaining the type of the corresponding reservoir through pore throat matching coefficients of different reservoirs.
Description
Technical field
The present invention relates to reservoir assessment technology field, more particularly relate to a kind of reservoir evaluation methods.
Background technology
The micropore structure feature of tight gas reservoir directly decide macroscopically reservoir hole, ooze and the property such as reservoir is good and bad
Matter, is by requisite part during evaluating reservoir.It is complicated that the main feature of tight gas reservoir is micropore structure,
And the diversity of reservoir micro throat structure is just presented as between porosity, permeability and every parameter of pore structure in presentation
The change of mutual relation.
At present, the most also it is dependent on conventional pressure hydrargyrum technology and observes and obtain micropore structure data information, and hollow billet pressure
Force curve is a kind of characteristic parameter obtained by conventional Mercury injection test.Although its morphological characteristic can be relatively
System, characterize the pore throat character feature of reservoir truly, but be that a form being difficult to quantify is retouched due to capillary pressure curve
State method, and only rock core is carried out the morphological characteristic pressing hydrargyrum experimental analysis could obtain curve.Although capillary pressure curve
Morphological characteristic can well indicate the micropore structure feature of reservoir, with this can in reservoir pore throat character carry out
Evaluation of classification, but there are two problems in it: and the first capillary pressure curve is a morphologic description method being difficult to quantify；Second
Only rock core is carried out the morphological characteristic pressing hydrargyrum experimental analysis could obtain curve, promotes and there is difficulty.Therefore, capillary tube is passed through
Pressure curve morphological characteristic carries out the evaluation of classification of reservoir micro throat structure and there is significant limitation in real process.
In sum, in prior art, exist and directly carried out evaluating reservoir by capillary pressure curve morphological characteristic in reality
Border exists circumscribed problem.
Summary of the invention
The embodiment of the present invention provides a kind of reservoir evaluation methods, bent in order to solve to exist in prior art by capillary pressure
Line morphology feature directly carries out evaluating reservoir and there is circumscribed problem in practice.
The embodiment of the present invention provides a kind of reservoir evaluation methods, comprises the following steps:
By the experimental data of the porosity of different reservoir, permeability and parameter of pore structure, determine described permeability with
Relational expression between described porosity and described parameter of pore structure；
According to the relational expression between described permeability and described porosity and described parameter of pore structure, define pore throat proportioning
Coefficient, determines the relational expression between described pore throat stoichiometric factor and described porosity and described permeability；
Obtain the described porosity of described different reservoir and described permeability, according to described pore throat stoichiometric factor and described hole
Relational expression between porosity and described permeability, it is thus achieved that the described pore throat stoichiometric factor of corresponding reservoir；
By the described pore throat stoichiometric factor of described different reservoir, it is thus achieved that the type of corresponding reservoir.
It is preferred that the relational expression between described permeability and described porosity and described parameter of pore structure, by following
Formula determines:
Wherein, K is described permeability,For described porosity, SF is form factor, and τ is crooked degree of hole, BET be than
Surface；Described parameter of pore structure includes described form factor, described crooked degree of hole and described specific surface；Definition
Wherein, PS=SF τ2BET2, PS is RESERVOIR PORE STRUCTURE constant, and PTR is described pore throat stoichiometric factor.
It is preferred that the relational expression between described pore throat stoichiometric factor and described porosity and described permeability, by following
Formula determines:
In the embodiment of the present invention, it is provided that a kind of reservoir evaluation methods, the method is by redefining capillary pressure curve, sharp
With the mutual relation between parameter of pore structure, it is carried out Quantitative yield, determine the parameter that makes new advances " pore throat stoichiometric factor ", only
On the basis of utilizing hole to ooze data, it is possible to accurate, the quantitative micropore structure feature characterizing reservoir, therefore it is a kind of effective
Evaluating reservoir new method.
Accompanying drawing explanation
A kind of reservoir evaluation methods flow chart that Fig. 1 provides for the embodiment of the present invention.
The typical well Shan 257 conventional pressure hydrargyrum capillary pressure curve classification chart that Fig. 2 a provides for the embodiment of the present invention.
The typical well Shan 394 conventional pressure hydrargyrum capillary pressure curve classification chart that Fig. 2 b provides for the embodiment of the present invention.
The typical well double 83 conventional pressure hydrargyrum capillary pressure curve classification chart that Fig. 2 c provides for the embodiment of the present invention.
The typical well elm 95 conventional pressure hydrargyrum capillary pressure curve classification chart that Fig. 2 d provides for the embodiment of the present invention.
The pore throat stoichiometric factor comparison of classification figure that Fig. 3 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
What Fig. 1 was exemplary shows a kind of reservoir evaluation methods flow chart that the embodiment of the present invention provides.As it is shown in figure 1,
A kind of reservoir evaluation methods that the embodiment of the present invention provides comprises the following steps:
Step S101, by the experimental data of the porosity of different reservoir, permeability and parameter of pore structure, determines infiltration
Relational expression between rate and porosity and parameter of pore structure.
It is preferred that in step S101, the relational expression between permeability and porosity and parameter of pore structure, by formula (1)
Determine:
In formula (1): K is permeability；For porosity；SF is form factor；τ is crooked degree of hole；BET is specific surface,
Parameter of pore structure includes form factor, crooked degree of hole and specific surface.
Step S102, according to the relational expression between permeability and porosity and parameter of pore structure, definition pore throat proportioning system
Number, determines the relational expression between pore throat stoichiometric factor and porosity and permeability.
It is preferred that in step s 102, the relational expression between pore throat stoichiometric factor and porosity and permeability, by formula (2)
Determine:
In formula (2): PTR is pore throat stoichiometric factor；K is permeability,For porosity.
It should be noted that as follows to the derivation of formula (2) from formula (1):
PS=SF τ2BET2 (3)
Wherein, PS defined in formula (3) is RESERVOIR PORE STRUCTURE constant.
Step S103, obtains the porosity of different reservoir and described permeability, according to pore throat stoichiometric factor and porosity and
Relational expression between permeability, it is thus achieved that the pore throat stoichiometric factor of corresponding reservoir.
Step S104, by the pore throat stoichiometric factor of different reservoir, it is thus achieved that the type of corresponding reservoir.
Specifically, first, the capillary pressure curve of different reservoir is obtained by pressure hydrargyrum experiment, by analyzing different reservoir
Capillary pressure curve obtains the pore throat character feature of corresponding reservoir；Then, by analyze different reservoir pore throat stoichiometric factor with
Corresponding relation between the pore throat character feature of corresponding reservoir, determines a kind of evaluating reservoir obtained by pore throat stoichiometric factor
Standard；Finally, the reservoir evaluation standard obtained by pore throat stoichiometric factor, it is thus achieved that the type of corresponding reservoir, i.e. obtains correspondence storage
The good and bad degree of layer.
It should be noted that by sample being entered hydrargyrum by ambient pressure, under a series of different pressures, measure it corresponding
Pore radius, enter hydrargyrum saturation, determine a series of parameters representing pore structure and capillary pressure curve feature thereof.
Rely on pressure hydrargyrum experimental observation to capillary pressure curve morphological characteristic can relatively system, characterize truly reservoir pore throat knot
Structure feature.
It should be noted that the reservoir evaluation standard obtained by pore throat stoichiometric factor is:
When PTR >=3, corresponding capillary pressure curve I class, represent reservoir micro throat structure good, belong to High-quality Reservoir；When
1.5≤PTR < 3, corresponding capillary pressure curve II class, represent reservoir micro throat structure preferable, belong to medium reservoir；When 0.7≤
PTR < 1.5, corresponding capillary pressure curve III class, show that reservoir micro throat structure is poor, belong to poor reservoir；When 0.7≤
PTR, corresponding capillary pressure curve IV class, represent reservoir micro throat structure very poor, belong to poor reservoir.
The typical well Shan 257 conventional pressure hydrargyrum capillary pressure curve classification chart that Fig. 2 a provides for the embodiment of the present invention.Fig. 2 b is
The typical well Shan 394 that the embodiment of the present invention provides conventional pressure hydrargyrum capillary pressure curve classification chart.Fig. 2 c is that the embodiment of the present invention carries
The typical well of confession double 83 conventional pressure hydrargyrum capillary pressure curve classification chart.The typical well elm 95 that Fig. 2 d provides for the embodiment of the present invention is normal
Rule pressure hydrargyrum capillary pressure curve classification chart.As shown in Fig. 2 a～2d, a kind of reservoir evaluation methods embodiment one that the present invention provides:
Herein as a example by the Mercury-injection test of East Ordos basin upper palaeozoic tight gas reservoir a large amount of rock core point, permissible
All kinds of parameter of pore structure that record of experiment and capillary pressure curve are classified, and with the curve of typical case's well for representative such as
Shown in Fig. 2 a～2d.Therefore, based on micropore structure research to the importance of tight gas evaluating reservoir and capillary pressure curve
Limitation, under the support of great many of experiments, ooze with hole a relation change reflection pore throat character change into theoretical basis, logical
Cross the mutual pass between the reservoir internal structure parameters such as the contrast porosity of similar graph, permeability and every parameter of pore structure
System, it is proposed that be determined by the relation of macroparameter and pore structure, carries out the quantification work of capillary pressure curve.
Derive the relational expression of porosity and every parameter of pore structure and permeability, by further deducing, determine
Go out quantitatively characterizing parameter pore throat stoichiometric factor (PTR) of capillary pressure curve, draft commenting of the RESERVOIR PORE STRUCTURE angle that makes new advances
Valency method pore throat stoichiometric factor (PTR) method.
The pore throat stoichiometric factor comparison of classification figure that Fig. 3 provides for the embodiment of the present invention.As it is shown on figure 3, what the present invention provided
A kind of reservoir evaluation methods embodiment two:
As a example by East Ordos basin reservoir in ancient times, ooze data according to the actual measurement hole of 280 mouthfuls of wells and calculate each well pair
The pore throat stoichiometric factor (PTR) answered, find tight gas reservoir pore throat stoichiometric factor (PTR) be mainly distributed on 0.3～5.6 it
Between, in conjunction with hole corresponding to each index, ooze value can by its by well to difference be 4 classes, as it is shown on figure 3, when PTR >=3, refer generally to
Showing I class High-quality Reservoir, as 1.5≤PTR < 3, corresponding is the II preferable reservoir of class, as 0.7≤PTR < 1.5, has typically represented poor
III class reservoir, as 0.7≤PTR, for IV very poor class reservoir.Meanwhile, these four classification can be with conventional capillary pressure curve
One_to_one corresponding.
Select four block of cells, in conjunction with conventional orifices ooze parameter and newly determined go out pore throat stoichiometric factor carry out each block
Reservoir classification and evaluation, and after comparing with the primiparity production capacity situation of corresponding each block, find the actual product of itself and production unit
Amount evaluation situation is essentially identical, as shown in table 1, such as: the north, Yulin block on 1 section of group mountain, Shanxi is according to pore throat proportioning system
Number method belongs to II class reservoir after calculating, and contrasting this district actual primiparity evaluation of result is advantageous area；2 sections of Yulin district, group mountain, Shanxi
Tuber belongs to I class reservoir after calculating according to pore throat stoichiometric factor method, and contrasting this district actual primiparity evaluation of result is Favorable Areas；Taiyuan
Group Shenmu County belongs to I class reservoir after calculating according to pore throat stoichiometric factor method with xi Area, and contrasting this district actual primiparity evaluation of result is
Favorable Areas；To the north of group Hengshan Mountain, Benxi, block belongs to III class reservoir after calculating according to pore throat stoichiometric factor method, contrasts this district actual
Primiparity evaluation of result is unfavorable area.
Table 1 East Ordos basin each layer position block of cells pore throat stoichiometric factor is evaluated and produces evaluation result contrast table
It follows that present good corresponding between pore throat stoichiometric factor (PTR) and the micro throat architectural feature of reservoir
Relation, i.e. PTR are one can characterize the parameter that micropore structure is good and bad, and this qualitatively characterizes reservoir microcosmic with hollow billet curve
The effect of pore structure characteristic is consistent.Therefore, it can utilize pore throat stoichiometric factor (PTR) method from micropore structure angle
Carry out evaluating reservoir accurately.
Above example further illustrates pore throat stoichiometric factor (PTR) and carries out evaluating reservoir and comment with the yield in actual production
Valency has concordance, shows that reservoir can be evaluated by pore throat stoichiometric factor (PTR) exactly.
In sum, a kind of reservoir evaluation methods that the embodiment of the present invention provides, the method is by redefining hollow billet pressure
Force curve, utilizes the mutual relation between parameter of pore structure, and it is carried out Quantitative yield, determines the parameter that makes new advances " pore throat proportioning
Coefficient ", on the basis of only utilizing hole to ooze data, it is possible to accurate, the quantitative micropore structure feature characterizing reservoir, therefore
It it is a kind of effective evaluating reservoir new method.
The several specific embodiments being only the present invention disclosed above, the present invention can be carried out by those skilled in the art
Various changes and modification without departing from the spirit and scope of the present invention, if the present invention these amendment and modification belong to the present invention
Within the scope of claim and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (3)
1. a reservoir evaluation methods, it is characterised in that comprise the following steps:
By the experimental data of the porosity of different reservoir, permeability and parameter of pore structure, determine that described permeability is with described
Relational expression between porosity and described parameter of pore structure；
According to the relational expression between described permeability and described porosity and described parameter of pore structure, definition pore throat proportioning system
Number, determines the relational expression between described pore throat stoichiometric factor and described porosity and described permeability；
Obtain the described porosity of described different reservoir and described permeability, according to described pore throat stoichiometric factor and described porosity
And the relational expression between described permeability, it is thus achieved that the described pore throat stoichiometric factor of corresponding reservoir；
By the described pore throat stoichiometric factor of described different reservoir, it is thus achieved that the type of corresponding reservoir.
2. the method for claim 1, it is characterised in that described permeability and described porosity and described pore structure ginseng
Relational expression between number, is determined by following equation:
Wherein, K is described permeability,For described porosity, SF is form factor, and τ is crooked degree of hole, and BET is specific surface；
Described parameter of pore structure includes described form factor, described crooked degree of hole and described specific surface；Definition
Wherein, PS=SF τ2BET2, PS is RESERVOIR PORE STRUCTURE constant, and PTR is described pore throat stoichiometric factor.
3. method as claimed in claim 2, it is characterised in that described pore throat stoichiometric factor and described porosity and described infiltration
Relational expression between rate, is determined by following equation:
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107976390A (en) * | 2017-10-13 | 2018-05-01 | 中国石油天然气集团公司 | It is a kind of based on the computational methods for covering pressure hole and oozing experiment and determining average pore-throat ratio |
| CN107993261A (en) * | 2017-11-02 | 2018-05-04 | 中国科学院地质与地球物理研究所 | A kind of hole based on three-dimensional Core Scanning Image and pore throat recognition methods |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976390A (en) * | 2017-10-13 | 2018-05-01 | 中国石油天然气集团公司 | It is a kind of based on the computational methods for covering pressure hole and oozing experiment and determining average pore-throat ratio |
| CN107993261A (en) * | 2017-11-02 | 2018-05-04 | 中国科学院地质与地球物理研究所 | A kind of hole based on three-dimensional Core Scanning Image and pore throat recognition methods |
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