CN108204936A - The characterizing method of compact reservoir micropore structure - Google Patents
The characterizing method of compact reservoir micropore structure Download PDFInfo
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- CN108204936A CN108204936A CN201611164619.1A CN201611164619A CN108204936A CN 108204936 A CN108204936 A CN 108204936A CN 201611164619 A CN201611164619 A CN 201611164619A CN 108204936 A CN108204936 A CN 108204936A
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- saturation degree
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- micropore structure
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- mercury saturation
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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
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
Abstract
The present invention provides a kind of characterizing method of compact reservoir micropore structure, and the characterizing method of the compact reservoir micropore structure includes：Step 1, pressure mercury Data Processing in Experiment is carried out；Step 2, using treated data, throat radius and the histogram of section mercury saturation degree frequency are drawn；Step 3, according to throat radius and section mercury saturation degree frequency histogram, main peak peak radius R is chosenf；Step 4, mercury pressuring data intercepting process is carried out；Step 5, venturi and hole configuration coefficients are calculated, using mercury test feature data are pressed, ask for throat radius and the corresponding section mercury saturation degree sum of products, the configuration coefficients as venturi and hole.The invention provides a kind of feasible method for the evaluation of compact reservoir micropore structure, has very big application prospect in the selection of compact oil reservoir development scheme, development response evaluation and evaluating reservoir.
Description
Technical field
The present invention relates to compact reservoirs to evaluate field, especially relates to a kind of characterization of compact reservoir micropore structure
Method.
Background technology
Compact reservoir physical property is poor, is mainly influenced by micropore structure, and development effectiveness, development scheme etc. are all by microcosmic
The larger impact of pore structure, the micropore structure for how characterizing compact reservoir are characterized in the emphasis of compact reservoir description.In
Hypertonic reservoir venturi is thick, and hole is big, more, and venturi is high with porosity communication degree, and larynx is primarily upon to the characterization of micropore structure
The size in road.But compact reservoir influences it and opens there are hole is few, venturi is thin, the essential characteristic of venturi and porosity communication degree difference
The mainly connecting degree of throat radius size and venturi and hole of originating party formula and development effectiveness.The microscopic void of compact reservoir
Structural characterization will not only describe throat size, distribution, more describe the configuration relation of venturi and hole.The present invention is mainly from description
The configuration relation of venturi and hole sets out, it is proposed that a kind of method of new description compact reservoir micropore structure enriches
The characterization parameter of micropore structure at present.
Invention content
The object of the present invention is to provide it is a kind of for compact reservoir micropore structure characterization parameter and method, particularly
In terms of the configuration relation of description venturi and hole.
The purpose of the present invention can be achieved by the following technical measures：Compact reservoir micropore structure characterizing method, should
The characterizing method of compact reservoir micropore structure includes：Step 1, pressure mercury Data Processing in Experiment is carried out；Step 2, processing is utilized
Data afterwards draw throat radius and the histogram of section mercury saturation degree frequency；Step 3, satisfied according to throat radius and section mercury
With degree frequency histogram, main peak peak radius R is chosenf；Step 4, mercury pressuring data intercepting process is carried out；Step 5, calculate venturi with
Hole configuration coefficients using mercury test feature data are pressed, ask for throat radius and the corresponding section mercury saturation degree sum of products, as
The configuration coefficients of venturi and hole.
The purpose of the present invention can be also achieved by the following technical measures：
In step 1, the initial data tested based on rock core intraventricular pressure mercury obtains the corresponding area of each throat radius
Between mercury saturation degree：
ΔSgi=Sgi-Sgi-1
In formula：ΔSgiFor section mercury saturation degree, %；SgiFor the corresponding accumulative mercury saturation degree of i data points, %；Sgi-1For i-
The corresponding accumulative mercury saturation degree of 1 data point, %, Sg0=0；
So as to computation interval mercury saturation degree frequency：
In formula：PSgiFor section mercury saturation degree frequency, %；ΔSgiFor section mercury saturation degree, %；Sg is accumulative mercury saturation
Degree, %.
In step 2, it according to the pressure mercury experiment process data obtained in step 1, draws using throat radius as abscissa, with
Corresponding section mercury saturation degree frequency is the frequency histogram of ordinate.
In step 3, the frequency histogram feature drawn according to step 2 is chosen the corresponding throat radius of main peak peak value, is made
For main peak-to-peak value radius Rf, characterize the size with the best throat radius of porosity communication.
In step 4, it is cutoff value with section mercury saturation degree frequency 1% in the processing data basis obtained in step 1,
Give up the data point that section mercury saturation degree frequency is less than 1%, obtain representing the characteristic of micropore structure feature, to eliminate
Influence of the small probability data to statistical result in statistic processes, reduces the false judgment to micropore structure feature.
In steps of 5, the characteristic obtained using step 4 calculates compact reservoir micropore structure venturi and hole
Configuration relation coefficient：
In formula：PZFor venturi and hole configuration coefficients, μm %；riFor throat radius, μm；ΔSgiFor section mercury saturation
Degree, %.
Compact reservoir micropore structure characterizing method in the present invention, is related to reservoir micropore structure representational field,
Mainly the connecting degree of compact reservoir venturi and hole is quantitatively described.This method utilizes laboratory core pressure mercury experiment
Initial data by data processing twice, throat radius and section mercury saturation degree frequency histogram, asks for main peak peak radius
(Rf) and venturi and hole configuration coefficients (PZ).Main peak peak radius (Rf) mainly characterize much throat radius and hole in reservoir
Connect best, venturi and hole configuration coefficients (PZ) characterize the reservoir connecting degree of venturi and hole on the whole.Utilize rock core
The initial data that intraventricular pressure mercury is tested obtains the corresponding section mercury saturation degree frequency P of each throat radiusSgi；According to pressure mercury
Experiment process data are drawn using throat radius as abscissa, using corresponding section mercury saturation degree frequency as the straight of ordinate
Fang Tu chooses the corresponding throat radius of main peak peak value, as main peak peak radius (Rf), it is with section mercury saturation degree frequency 1%
Cutoff value gives up the data point that section mercury saturation degree frequency is less than 1%, obtains representing the characteristic of micropore structure feature
According to calculating compact reservoir micropore structure venturi and hole configuration relation coefficient.The invention is compact reservoir microscopic void knot
Structure evaluation provides a kind of feasible method, has very in the selection of compact oil reservoir development scheme, development response evaluation and evaluating reservoir
Big application prospect.
Description of the drawings
Fig. 1 is that rock core presses mercury experimentation schematic diagram in a specific embodiment of the invention；
Fig. 2 is the specific embodiment of compact reservoir micropore structure characterizing method in a specific embodiment of the invention
Flow chart；
Throat radius and section mercury saturation degree frequency histogram in the specific embodiment of Fig. 3 present invention.
Specific embodiment
For enable the present invention above and other objects, features and advantages be clearer and more comprehensible, it is cited below particularly go out preferable implementation
Example, and coordinate institute's accompanying drawings, it is described in detail below.
As shown in Fig. 2, Fig. 2 is the flow chart of the compact reservoir micropore structure characterizing method of the present invention.
Laboratory core pressure mercury experimentation pressure constantly rises, and pressure reflection is throat radius size, is risen in pressure
Mercury constantly enters rock core in the process, if the process differentiation, pressure increases Δ P, increases section mercury saturation degree Δ Sg, pressure
P corresponds to throat radius, it is believed that section mercury saturation degree Δ Sg is the pore volume of throat radius connection.Based on above reason
By, it is good with porosity communication using pressing mercury experimental data that can evaluate the great throat radius of compact reservoir, and evaluate entire rock core
The connecting degree of venturi and hole.
In a step 101, data processing, the accumulative mercury saturation computation tested according to pressure mercury obtain each venturi half
The section mercury saturation degree of diameter and section mercury saturation degree frequency (section mercury saturation degree/total mercury saturation degree).In one embodiment, it utilizes
The obtained initial data of the intraventricular pressure mercury experiment of rock core, obtains the corresponding section mercury saturation degree of each throat radius：
ΔSgi=Sgi-Sgi-1
In formula：ΔSgiFor section mercury saturation degree, %；SgiFor the corresponding accumulative mercury saturation degree of i data points, %；Sgi-1For i-
The corresponding accumulative mercury saturation degree of 1 data point, %, Sg0=0.
So as to computation interval mercury saturation degree frequency：
In formula：PSgiFor section mercury saturation degree frequency, %；ΔSgiFor section mercury saturation degree, %；Sg is accumulative mercury saturation
Degree, %.It the results are shown in Table 1.
The original pressure mercury Data Processing in Experiment table of table 1
Flow enters step 102.
In a step 102, it according to the pressure mercury experiment process data obtained in step 101, draws using throat radius as horizontal seat
Mark, using corresponding section mercury saturation degree frequency as the histogram of ordinate, as shown in Figure 1.Flow enters step 103.
In step 103, according to the distribution mode of throat radius mercury saturation degree frequency histogram, the peak value pair of main peak is chosen
The throat radius characterization and the size of the best throat radius of porosity communication answered, referred to as main peak peak value throat radius.It is real one
It applies in example, according to the frequency histogram feature that step 102 is drawn, the corresponding throat radius of main peak peak value is chosen, as main peak peak
It is worth radius (Rf), characterization and the size of the best throat radius of porosity communication, such as Fig. 1.Flow enters step 104.
At step 104, mercury pressuring data intercepting process is cutoff value with section mercury saturation degree frequency 1%, gives up section mercury
Saturation degree frequency is less than 1% data point, obtains pressure mercury test feature data.In one embodiment, with section mercury saturation degree frequency
Rate 1% is cutoff value, gives up the data point that section mercury saturation degree frequency is less than 1%, obtains representing micropore structure feature
Characteristic is shown in Table 2.
Table 2 presses mercury test feature data processing table and venturi and hole configuration coefficients result of calculation
Flow enters step 105
In step 105, venturi is calculated with hole configuration coefficients, using characteristic, asks for throat radius and section mercury
The sum of the product of saturation degree as venturi and hole configuration coefficients, characterizes the connecting degree of entire sample venturi and hole.Utilize step
Rapid 104 obtained characteristics calculate compact reservoir micropore structure venturi and hole configuration relation coefficient：
In formula：PZFor venturi and hole configuration coefficients, μm %；riFor throat radius, μm；ΔSgiFor section mercury saturation
Degree, %.2 are the results are shown in Table, flow terminates.
Claims (6)
1. the characterizing method of compact reservoir micropore structure, which is characterized in that the characterization of the compact reservoir micropore structure
Method includes：
Step 1, pressure mercury Data Processing in Experiment is carried out；
Step 2, using treated data, throat radius and the histogram of section mercury saturation degree frequency are drawn；
Step 3, according to throat radius and section mercury saturation degree frequency histogram, main peak peak radius R is chosenf；
Step 4, mercury pressuring data intercepting process is carried out；
Step 5, venturi and hole configuration coefficients are calculated, using mercury test feature data are pressed, ask for throat radius and corresponding section
The mercury saturation degree sum of products, the configuration coefficients as venturi and hole.
2. the characterizing method of compact reservoir micropore structure according to claim 1, which is characterized in that in step 1,
Based on the initial data that rock core intraventricular pressure mercury is tested, the corresponding section mercury saturation degree of each throat radius is obtained：
ΔSgi=Sgi-Sgi-1
In formula：ΔSgiFor section mercury saturation degree, %；SgiFor the corresponding accumulative mercury saturation degree of i data points, %；Sgi-1For i-1 numbers
The corresponding accumulative mercury saturation degree in strong point, %, Sg0=0；
So as to computation interval mercury saturation degree frequency：
In formula：PSgiFor section mercury saturation degree frequency, %；ΔSgiFor section mercury saturation degree, %；Sg is to add up mercury saturation degree, %.
3. the characterizing method of compact reservoir micropore structure according to claim 1, which is characterized in that in step 2,
According to the pressure mercury experiment process data obtained in step 1, draw using throat radius as abscissa, satisfied with corresponding section mercury
With the frequency histogram that degree frequency is ordinate.
4. the characterizing method of compact reservoir micropore structure according to claim 1, which is characterized in that in step 3,
According to the frequency histogram feature that step 2 is drawn, the corresponding throat radius of main peak peak value is chosen, as main peak peak radius Rf,
Characterization and the size of the best throat radius of porosity communication.
5. the characterizing method of compact reservoir micropore structure according to claim 1, which is characterized in that in step 4,
It is cutoff value with section mercury saturation degree frequency 1% in the processing data basis obtained in step 1, gives up section mercury saturation degree frequency
Rate is less than 1% data point, obtains representing the characteristic of micropore structure feature, to eliminate small probability number in statistic processes
According to the influence to statistical result, the false judgment to micropore structure feature is reduced.
6. the characterizing method of compact reservoir micropore structure according to claim 1, which is characterized in that in steps of 5,
The characteristic obtained using step 4 calculates compact reservoir micropore structure venturi and hole configuration relation coefficient：
In formula：PZFor venturi and hole configuration coefficients, μm %；riFor throat radius, μm；ΔSgiFor section mercury saturation degree, %.
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