CN110032744A - A kind of unconventional oil and gas Reserve Estimation Method and system - Google Patents
A kind of unconventional oil and gas Reserve Estimation Method and system Download PDFInfo
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Abstract
The invention discloses a kind of unconventional oil and gas Reserve Estimation Methods, this method comprises the following steps: according to RESERVOIR PORE STRUCTURE, the impacted nanoaperture of the flowing for flowing freely macrovoid and unconventional oil and gas that active porosity in reservoir is divided into unconventional oil and gas, it determines the hole boundary value of the difference macrovoid and the nanoaperture, and obtains the macrovoid and the nanoaperture respectively accounts for the volume fraction of active porosity；Reserves calculate step, and the volume fraction of active porosity is respectively accounted for using the macrovoid and the nanoaperture, calculate separately the reserves of unconventional oil and gas in both holes, complete the calculating of reservoir rock gross reserves.The present invention has modified reserves and calculates porosity parameter, by the nanoaperture that reservoir pore space is divided into free flowable macrovoid, flowing is influenced by adsorbed gas, improves the computational accuracy of unconventional oil and gas reserves, more tallies with the actual situation.
Description
Technical field
The present invention relates to unconventional oil and gas exploration and development fields, specifically, being to be related to a kind of unconventional oil and gas finimeter
Calculate method and system.
Background technique
Now, the unconventional petroleum resources such as shale gas, tight gas, fine and close oil are abundant, have been more than conventional gas and oil stock number,
Exploration and development also achieves important breakthrough, such as with horizontal well drilling, the development of multistage fracturing technique, the U.S., Canada, China
All have been achieved with the business development of shale gas.In the U.S., the yield specific gravity of shale gas accounted for the 20% of natural gas total output with
On.China is that third obtains the country that shale gas exploration and development is broken through in the world, and shale gas stock number reaches 25.1 trillion sides,
Stock number is huge.
Finimeter be unconventional oil and gas well rational proration, evaluation of Fracturing Effect on Compact Sandstone and optimization, development plan work out and adjustment,
The basis of Predicting The Recovery Efficiency, economic evaluation, has very important effect.Due to being related to multiple dimensioned flow mechanism coupling, splitting
The complicated factors such as the identification of slit state, man-made fracture and intrinsic fracture interaction, flow field diagnosis, therefore shale gas well yield is predicted
Difficulty is big, uncertain factor is more, accuracy is poor.
Existing Reserve Estimation Method does not account for the influence of microscopic void, in calculating process not by porosity parameter into
Row classification considers that the influence of nanometer fine pore is extremely important due to the particularity of unconventional oil and gas.Unconventional oil and gas well is especially
Shale gas well Reserves Evaluation method and conventional oil gas well difference are very big, are mainly reflected in: (1) shale gas reserves are by free gas, suction
Attached gas and solution gas composition, the ratio of each section is difficult to determine, and normal gas pools only consider free gas；(2) shale gas reservoir
It is self-generation, self-reservoir gas reservoir, needs " manually making hiding ", reserves size is influenced by hydraulic fracturing transformation；(3) if by Production development point
Analysis carries out Reserves Evaluation, then fluid flowing is required to reach the boundary Control stream stage, and since reservoir permeability is extremely low, unconventional oil
Gas well is extremely difficult to the boundary Control stream stage.
Unconventional oil and gas Reserve Estimation Method mainly has static method and dynamic method at present.For producing well, well can be used
Creation data calculate, main calculation methods are production decline method, material balance method and Method for Numerical etc..In the prior art,
It generallys use following method to be calculated: first, being related to the influence of shale adsorbed gas desorption and abnormal high pressure, establishing and calculate page
The matter balance equation of rock gas reserves；Second, the influence of adsorbed gas desorption gas abnormal high pressure is considered by calculating flowing bottomhole pressure (FBHP),
It is directed to the fracturing reform area of multistage pressure break horizontal well respectively and area is not transformed and establishes matter balance equation calculating dynamic holdup；Its
Three, evaluation region, which is divided into, to be had well information data area and without drilling data area, calculates oil in place abundance with different parameters.But this three
Kind method only directly calculates completion by the porosity constant of single type to the evaluation of porosity parameter.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of unconventional oil and gas Reserve Estimation Method, this method packets
Include following steps: the active porosity in reservoir is divided into unconventional oil and gas according to RESERVOIR PORE STRUCTURE by hole partiting step
The impacted nanoaperture of the flowing of macrovoid and unconventional oil and gas can be flowed freely, is determined and is distinguished the macrovoid and described receive
The hole boundary value of metre hole gap, and obtain the macrovoid and the nanoaperture respectively accounts for the volume fraction of active porosity；Reserves
Step is calculated, the volume fraction of active porosity is respectively accounted for using the macrovoid and the nanoaperture, calculates separately both holes
The reserves of unconventional oil and gas in gap complete the calculating of reservoir rock gross reserves.
Preferably, the hole partiting step further comprises following steps: the hole in reservoir rock is classified,
And the composition of wherein active porosity is analyzed, correct porosity parameter；Based on correction result, unconventional oil and gas in reservoir pore space is utilized
Intermolecular absorption principle calculates the hole boundary value for distinguishing the macrovoid and the nanoaperture；Based on pore-size with
The relationship of the volume fraction of same size hole is drawn reservoir pore space size distribution curve, and is obtained according to the hole boundary value
To the macroporous volume fraction.
Preferably, it is calculated in step in the reserves, according to the unconventional oil and gas molecular number and reservoir in the macrovoid
The active porosity volume of rock calculates the macroporous unconventional oil and gas reserves using the equation of gas state.
Preferably, it is calculated in step in the reserves, calculates the macroporous reserves using following expression:
Wherein, GLargeIndicate that the macroporous unconventional oil and gas reserves, ε indicate the macroporous volume fraction,
VP, HCIndicate the total volume of active porosity described in reservoir rock, nLargeIndicate unconventional in the macrovoid in unit volume
Oil gas molecular number, NAIndicate that Avogadro constant number, R indicate the gas constant of unconventional oil and gas, TSCIndicate normal temperature, pSCTable
Show normal pressure.
Preferably, it is calculated in step in the reserves, the nanoaperture in reservoir rock is simulated, based on different storages
All nanoapertures are divided into several specific dimensions nanoaperture areas, obtained each described specific by layer pore-size
The reserves in sized nanostructures hole area, by the calculating for completing the nanoaperture gross reserves after accumulating operation.
Preferably, it is calculated in step in the reserves, obtains each specific dimensions nanoaperture as follows
The unconventional oil and gas reserves in area: it is based on the reservoir pore space size distribution curve, obtains each specific dimensions nanoaperture
The volume in area；It determines in each specific dimensions nanoaperture area described in the quantity of the nanoaperture and corresponding region
Unconventional oil and gas molecular number in nanoaperture further obtains the unconventional oil and gas storage in specific dimensions nanoaperture area
Amount.
Preferably, it is calculated in step in the reserves, calculates specific dimensions nanoaperture area using following expression
Unconventional oil and gas reserves:
Wherein, GNano, iIndicate the unconventional oil and gas reserves in specific dimensions nanoaperture area, NNano, iIndicate the spy
Unconventional oil and gas molecular number in scale cun nanoaperture area in the nanoaperture, i indicate the specific dimensions nanoaperture
The serial number in area, NAIndicate that Avogadro constant number, R indicate the gas constant of unconventional oil and gas, TSCIndicate normal temperature, pSCIt indicates
Normal pressure, ξiIndicate the quantity of the nanoaperture in specific dimensions nanoaperture area.
On the other hand, a kind of unconventional oil and gas Reserves Calculation System is provided, the system includes the following modules: volume integral
It is big to be divided into flowing freely for unconventional oil and gas according to RESERVOIR PORE STRUCTURE by computing module for active porosity in reservoir
The impacted nanoaperture of the flowing of hole and unconventional oil and gas, determines the hole for distinguishing the macrovoid and the nanoaperture
Boundary value, and obtain the macrovoid and the nanoaperture respectively accounts for the volume fraction of active porosity；Reserves computing module, benefit
The volume fraction that active porosity is respectively accounted for the macrovoid and the nanoaperture calculates separately unconventional oil in both holes
The reserves of gas complete the calculating of reservoir rock gross reserves.
Preferably, the volume integral computing module includes: porosity amending unit, by the hole in reservoir rock into
Row classification, and the composition of wherein active porosity is analyzed, correct porosity parameter；Hole boundary value computing unit, based on amendment
As a result, calculating using the intermolecular absorption principle of unconventional oil and gas in reservoir pore space and distinguishing the macrovoid and the nano-pore
The hole boundary value of gap；Pore volume fraction acquiring unit, the volume fraction based on pore-size and same size hole
Relationship draws reservoir pore space size distribution curve, and obtains the macroporous volume fraction according to the hole boundary value.
Preferably, the reserves computing module further comprises: macrovoid reserves computing unit, according to the macrovoid
In unconventional oil and gas molecular number and the active porosity volume of reservoir rock calculate the macrovoid using the equation of gas state
Unconventional oil and gas reserves；Nanoaperture reserves computing unit simulates the nanoaperture in reservoir rock, based on difference
Reservoir pore space size, all nanoapertures are divided into several specific dimensions nanoaperture areas, are obtained each described
The reserves in specific dimensions nanoaperture area, by the calculating for completing the nanoaperture gross reserves after accumulating operation.
Compared with prior art, one or more embodiments in above scheme can have following advantage or beneficial to effect
Fruit:
The present invention has modified reserves and calculates porosity parameter, and reservoir pore space, which is divided into unconventional oil and gas, to be flowed freely
Macrovoid, the nanoaperture that is influenced by adsorbed gas of flowing, improve the computational accuracy of reservoir reserves, more tally with the actual situation.
Other advantages, target and feature of the invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.Target and other advantages of the invention can be wanted by following specification, right
Specifically noted structure is sought in book and attached drawing to be achieved and obtained.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example and is used together to explain the present invention, be not construed as limiting the invention.In the accompanying drawings:
The step of Fig. 1 is the unconventional oil and gas Reserve Estimation Method of the embodiment of the present application is schemed.
Fig. 2 is the specific flow chart of the unconventional oil and gas Reserve Estimation Method of the embodiment of the present application.
Fig. 3 is shale gas gas point in the unit pore volume of the unconventional oil and gas Reserve Estimation Method of the embodiment of the present application
The relational graph of subnumber and aperture.
Fig. 4 is the reservoir pore space size distribution curve figure of the unconventional oil and gas Reserve Estimation Method of the embodiment of the present application.
Fig. 5 is the unconventional oil and gas Reserves Calculation System structural schematic diagram of the embodiment of the present application.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching technical effect can fully understand and implement.It needs to illustrate
As long as not constituting conflict, each feature in each embodiment and each embodiment in the present invention can be combined with each other,
It is within the scope of the present invention to be formed by technical solution.
In existing Reserve Estimation Method, porosity parameter is the parameter of a non-classified description, but due to being rich in
The shale reservoir of organic matter is made of multiple dimensioned pore structure, by molecular dynamics simulation it is found that gas in unit volume
Body Molecules increase with the reduction in aperture, therefore untraditional reservoir absorption occurs mainly in smaller aperture, adsorbs
Effect has a hole boundary value, so the molecular number in macrovoid and fine pore unit volume is different, with
Pressure reduction is produced, adsorbed gas desorption occurs mainly in fine pore, therefore in the calculating of unconventional oil and gas reserves, porosity uses
One parameter is described and does not tally with the actual situation, and should divide into macrovoid and fine pore.
The embodiment of the present invention is intended to be formed a kind of unconventional oil and gas Reserve Estimation Method, improves the precision and standard of Reserves Assessment
True property.In order to accurately calculate unconventional oil and gas reserves, by reservoir pore space be divided into macrovoid that unconventional oil and gas can flow freely,
Flow the nanoaperture (also referred to as " the impacted nanoaperture of the flowing of unconventional oil and gas ") influenced by adsorbed gas, the hole that water occupies
The 3 class hole such as gap.By molecular dynamics simulation and laboratory test, determine to flow freely macrovoid and flowing by adsorbed gas
The hole boundary value of the nanoaperture of influence.
The step of Fig. 1 is the unconventional oil and gas Reserve Estimation Method of the embodiment of the present application is schemed.Fig. 2 is the embodiment of the present application
The specific flow chart of unconventional oil and gas Reserve Estimation Method.It is described in detail below with reference to Fig. 1, Fig. 2 for the calculation method.
With reference to Fig. 1, in step S110 (hole partiting step), firstly, will be in reservoir rock according to RESERVOIR PORE STRUCTURE
Active porosity classify, the composition of analysis wherein active porosity, and being modified to porosity parameter draws active porosity
The macrovoid that flows freely for being divided into unconventional oil and gas (will be " non-in the explanation below to unconventional oil and gas Reserve Estimation Method
Conventional gas and oil flows freely macrovoid " be referred to as " flowable macrovoid ") and the flowing of unconventional oil and gas impacted receive
Metre hole gap (in the explanation below to unconventional oil and gas Reserve Estimation Method, it will " the impacted nanometer of the flowing of unconventional oil and gas
Hole " is referred to as " nanoaperture ").Then, intermolecular using unconventional oil and gas in reservoir rock based on analysis and correction result
Absorption principle, hole circle for both calculating the hole boundary value for distinguishing flowable macrovoid and nanoaperture, and determining difference
Limit value.Finally, the relationship based on pore-size Yu the volume fraction of same size hole, it is bent to draw the distribution of reservoir pore space size
Line obtains the volume fraction that above-mentioned macrovoid and nanoaperture respectively account for active porosity.
Specifically, in order to accurately calculate the reserves of unconventional oil and gas, the hole of reservoir rock is divided into unconventional oil and gas
The macrovoid of energy free-flowing flows the nanoaperture influenced by adsorbed gas, hole, not flowable blowhole that water occupies etc.
Several class holes, and indicated using following expression:
ΦHC=Φ-ΦTrapped, HC-ΦFW-ΦCBW (1)
Wherein, ΦHCIndicate the effecive porosity in reservoir rock, Φ indicates reservoir rock total porosity, ΦTrapped, HCTable
Show not flowable rock porosity, Φ in reservoir rock nanoporosityFWIndicate free water pore volume in reservoir rock, ΦCBWTable
Show and fetters water pore volume in reservoir rock.
In actual application, the hole that can store unconventional oil and gas is active porosity, in above-mentioned reservoir rock
In several class holes, flowable macrovoid and nanoaperture are active porosity.Therefore, formula (1) is simplified, from total pore space
Porosity shared by irreducible water and Free water is subtracted in degree, completes the amendment to effecive porosity parameter, and using such as following table
Revised effecive porosity is indicated up to formula:
ΦHC=ΦLarge+ΦNano (2)
Wherein, ΦLargeIndicate flowable macroporous porosity in reservoir rock, ΦNanoIndicate nanometer in reservoir rock
The porosity of hole.
Further, formula (2) are deformed, obtain following expression:
ΦHC=ε ΦHC+(1-ε)·ΦHC (3)
Wherein, ε indicates the volume fraction of active porosity shared by flowable macrovoid in reservoir rock.
Then, in order to calculate the flowable macroporous volume fraction ε after amendment in porosity parameter, rock is first directed to
Sample and unconventional oil and gas sample carry out molecular dynamics simulation experiment and laboratory experiment, simulate different nanopore sizes pair
The unconventional oil and gas molecular number stored in the unit pore volume answered.Due to the influence of the intermolecular suction-operated of unconventional oil and gas,
Molecular number in unit pore volume is gradually reduced, when aperture increases to a certain extent after, molecular number in unit pore volume
No longer reduce.This shows that influence of the Molecular Adsorption effect to the lesser nanoaperture of pore-size is very big, and to pore-size
Biggish hole influences very little, distinguishes flowing by the hole boundary value of Adsorption Effect thus, it is possible to determine.
After hole boundary value has been determined, the side such as high-pressure mercury, nitrogen adsorption can use according to existing rock sample
Method calculates the pore volume fraction of each aperture value in the sample, to will be greater than according to above-mentioned fixed hole boundary value
The pore volume fraction for stating hole boundary value is integrated, and it is big that flowing freely for unconventional oil and gas in reservoir rock can be obtained
The volume fraction of effective volume shared by hole.
When calculating after flowing freely macroporous volume fraction of unconventional oil and gas, step S120 (reserves are entered
Calculate step) in.In this step, using the flowing for flowing freely macrovoid and unconventional oil and gas of unconventional oil and gas by shadow
The volume fraction of loud nanoaperture, calculates separately the reserves of unconventional oil and gas in both holes, and by the two reserves values
Accumulating operation is carried out, to complete the calculating of reservoir rock gross reserves.
Specifically, be based on known rock density parameter, by above-mentioned formula (2), formula (3) divided by rock density, into
One step indicates effective reservoir pore volume using following expression.
VP, HC=VP, Large+VP, Nano (4)
VP, HC=ε VP, HC+(1-ε)·VP, HC (5)
Wherein, VP, HCIndicate the active porosity volume of reservoir rock, VP, LargeIndicate flowable macroporous in reservoir rock
Volume, VP, NanoIndicate the volume of nanoaperture in reservoir rock.It should be noted that the value of these three pore volumes can be from Fig. 2
Drawing process in obtain.
Then, the calculating for flowing freely macrovoid reserves of unconventional oil and gas is described in detail.It is above-mentioned determining
In reservoir rock after the volume of active porosity, according to the unconventional oil and gas molecule in active porosity volume and flowable macrovoid
Number, using the equation of gas state, obtains the volume of unconventional oil and gas molecule being stored in flowable macrovoid, i.e., flowable big
The reserves of hole.Since unconventional oil and gas is to adsorb with free state as main existing way, ingredient is with hydrocarbon molecules
Based on.Therefore, in this example, if calculating the reserves for the unconventional oil and gas being stored in active porosity, using the effective hole of calculating
The method of the volume of hydrocarbon molecules obtains in gap, and is indicated with following expression:
Wherein, GLargeIndicate flowable macroporous reserves, nLargeIt indicates in the flowable macrovoid of unit volume very
It advises oil gas molecular number (hydrocarbon molecules number), NAIndicate that Avogadro constant number, R indicate the gas constant of unconventional oil and gas, TSCTable
Show normal temperature, pSCIndicate normal pressure.It should be noted that parameter nLargeIt is by normal pressure and normal temperature condition
Under molecular simulation process be calculated, equal to unconventional oil and gas flow freely molecular number N total in macrovoidLarge
(can obtain from molecular dynamics simulation) flows freely macroporous total volume divided by the unconventional oil and gas of simulation,
In, unconventional oil and gas molecular number is equal to ε × V in the flowable macrovoid in rock per tonP, HC×nLarge/NA。
Next, illustrating the calculation method for flowing impacted nanoaperture reserves of unconventional oil and gas.In this example
In, the calculating of nanoaperture reserves is increasingly complex, and this method first simulates the nanoaperture in reservoir rock, is based on reservoir pore space ruler
All nanoapertures are divided into several specific dimensions nanoaperture areas, calculate each specific dimensions nanometer by very little distribution curve
The reserves in hole area obtain the gross reserves of nanoaperture by accumulating operation.It should be noted that in this application, specific ruler
The division in very little nanoaperture area is divided according to the different aperture size of nanoaperture in rock sample, by same hole
The nanoaperture of size is classified as a specific dimensions nanoaperture area, division principle of the application to specific dimensions nanoaperture area
It is not especially limited, those skilled in the art can be designed according to practical situations.
In this example, the calculation method of nanoaperture gross reserves such as following table is up to shown in formula:
Wherein, GNanoIndicate the gross reserves of nanoaperture, GNano, iIndicate that the reserves in specific dimensions nanoaperture area, i indicate
The serial number in specific dimensions nanoaperture area, m indicate the total quantity in specific dimensions nanoaperture area.
Calculating below for specific dimensions nanoaperture area reserves is further described.
Firstly, (referring to Fig. 4) needs to obtain each specific dimensions nanoaperture area based on reservoir pore space size distribution curve
Volume, and using following expression indicate:
VP, Nano, i=VP, HC×VNano%, i/100 (8)
Wherein, VP, Nano, iIndicate the volume in specific dimensions nanoaperture area, VNano%, iIndicate specific dimensions nanoaperture area
Pore volume fraction.It should be noted that the volume fraction for different specific dimensions nanoaperture areas can utilize Fig. 4 meter
It obtains.
Then, it is determined that the quantity for the nanoaperture for being included in each specific dimensions nanoaperture area, and utilize following expression
Formula indicates:
Wherein, ξiIndicate the quantity of nanoaperture in specific dimensions nanoaperture area, V0, iIndicate specific dimensions nanoaperture
The volume of the single nanoaperture simulated in area.It should be noted that in simulated experiment of the application for nanoaperture,
Attribute based on nanoaperture, nanoaperture can be modeled as cylindrical body, cuboid, spherical shape or other shapes, and the application is to this
Without limitation.Further, the volume of every kind of nanoaperture can be calculated according to calculation formula of different shapes.In this example,
The simulating shape of nanoaperture is cylindrical body, then its pore volume is V0, i=π r2L, wherein r indicates the nanoaperture simulated
Bottom surface radius, L indicates the length of nanoaperture simulated.
Then, it according to the above-mentioned simulated experiment for nanoaperture, can determine in each specific dimensions nanoaperture area
Unconventional oil and gas molecular number in nanoaperture, to obtain in specific dimensions nanoaperture area hydrocarbon molecules in nanoaperture
Volume completes the calculating for being directed to specific dimensions nanoaperture area reserves, and calculates specific dimensions nanometer using following expression
The reserves in hole area:
Wherein, NNano, iIndicate the unconventional oil and gas molecular number in specific dimensions nanoaperture area nanoaperture.
Finally, formula (10) is brought into above-mentioned formula (7), the gross reserves of nanoaperture in reservoir rock is obtained.Tool
Body, the calculation expression of nanoaperture gross reserves is as follows:
Wherein, nNano, i=NNano, i/(V0, i), parameter nNano, iIndicate the unconventional oil in the nanoaperture in unit volume
Gas molecular number (hydrocarbon molecules number).
Finally, referring again to FIGS. 2, in the embodiment of the present application, flowing freely macrovoid when completion unconventional oil and gas
After the reserves of impacted nanoaperture calculate with the flowing of unconventional oil and gas, the two is subjected to accumulating operation, obtains reservoir rock
The gross reserves of stone.Specifically, reservoir rock gross reserves is calculated using following expression:
G=GLarge+GNano (12)
Further, above-mentioned formula (6) and formula (11) are brought into respectively in formula (12), and according to A Fojiadeluochang
Constant known to number, the gas constant of unconventional oil and gas, normal pressure and normal temperature etc., obtains always storing up in final reservoir rock
The calculation expression of amount.Specifically, the calculation expression of reservoir rock gross reserves is as follows:
(example)
Below by taking the shale gas in unconventional oil and gas as an example, according to above-mentioned unconventional oil and gas Reserve Estimation Method, specifically
The calculation method of shale gas gross reserves in bright shale reservoir.
Firstly, it is free flowable that the active porosity in reservoir is divided into shale gas according to shale reservoir pore structure
Macrovoid and the impacted nanoaperture of shale flow of air, and by the active porosity in shale reservoir shown in above-mentioned formula (1)
Degree parameter is modified, and obtains revised effecive porosity (as shown in formula 2).
Then, in order to calculate the free flowable macroporous volume fraction ε of shale gas after amendment in porosity parameter,
First to determine the free flowable macrovoid of shale gas and the impacted nanoaperture of shale flow of air in difference shale reservoir
Hole boundary value is calculated using the shale gas fluid of fluid components as shown in Table 1.
1 shale fluid components table (unit: %) of table
| CH4 | C2H6 | C3H8 | C4H10 | C5H12 | N2 | CO2 | |
| Fluid 1 | 74.9 | 9.7 | 8.6 | 4.8 | 2.0 | - | - |
As shown in table 1, the hydrocarbon molecules in fluid 1 are the shale gas stored in active porosity.During the experiment, in order to
The flowing for characterizing shale fluid in nanoporosity is obtained flowing in various sizes of hole and is reached by molecular dynamics simulation
To Molecules when stablizing.In order to show conveniently, by the molecular number under unit pore volume divided by Avogadro constant number, column
In table 2.
The relation table of the molecular number of 2 nanopore size of table and unit pore volume
Then, the relationship of shale gas gas molecula number and aperture of the fluid 1 in unit pore volume is drawn out according to table 2
Figure.Fig. 3 is shale gas gas molecula number in the unit pore volume of the unconventional oil and gas Reserve Estimation Method of the embodiment of the present application
With the relational graph in aperture.It is lesser to aperture to can be obtained according to intermolecular absorption principle for Molecular Adsorption effect in conjunction with Fig. 3, table 2
The influence of the impacted nanoaperture of shale flow of air is very big, and influences very little to the biggish hole in aperture, thus, it is possible to really
It is fixed to distinguish flowing by the hole boundary value of Adsorption Effect.From Table 2, it can be seen that the hole boundary value of fluid 1 is 30nm, that is, exist
In hole less than 30nm, the fluid 1 in the suction-operated nanoaperture impacted on shale flow of air influences very big.
In this example, after hole boundary value has been determined, it is each that shale samples using high-pressure mercury method are calculated into the sample
The pore volume fraction of aperture value, to obtain table 3.
The pore volume fraction table of each aperture size in 3 shale samples of table
Finally, drawing out pore volume fraction and aperture relational graph further according to table 3.Fig. 4 be the embodiment of the present application very
Advise the reservoir pore space size distribution curve figure of oil and gas reserves calculation method.In conjunction with Fig. 4, table 3, according to above-mentioned fixed hole circle
The pore volume fraction for being greater than the boundary value in Fig. 4 can be integrated, shale gas in above-mentioned shale reservoir can be obtained by limit value
Volume fraction ε shared by free flowable macrovoid.In this example, macrovoid volume fraction is 0.103.
After calculating shale gas flowable macroporous volume fraction, need to utilize flowable macrovoid and nanoaperture
Volume fraction, calculate separately the storage of the free flowable macrovoid of shale gas and the impacted nanoaperture of shale flow of air
Amount, and the two reserves values are subjected to accumulating operation, complete the calculating of shale reservoir gross reserves.
Specifically, be based on known rock density parameter, by above-mentioned formula (2), formula (3) divided by rock density, after
Obtain the new formula (4) for indicating effective reservoir pore volume and formula (5).Wherein, VP, HCIndicate the effective of shale reservoir
Pore volume, VP, LargeIndicate the free flowable macroporous volume of shale gas in shale reservoir, VP, NanoIndicate shale reservoir
The volume of the impacted nanoaperture of middle shale flow of air.
Then, the calculation method of the free flowable macrovoid reserves of shale gas is described in detail.On having determined
It states in shale reservoir after the volume of active porosity, according in active porosity volume and the free flowable macrovoid of shale gas
Shale gas molecular number obtains the shale gas molecule being stored in the free flowable macrovoid of shale gas using state equation
The flowable macroporous reserves of volume, i.e. shale gas.In this example, shale gas can be calculated using above-mentioned formula (6) can be certainly
By the macroporous reserves flowed.Wherein, in formula (6), GLargeIndicate the free flowable macroporous reserves of shale gas,
nLargeIndicate that the shale gas of unit volume can flow freely the shale gas molecular number in macrovoid, NAIndicate A Fojiadeluochang
Number, R indicate shale gas gas constant, TSCIndicate normal temperature, pSCIndicate normal pressure.It should be noted that parameter nLargeIt is
It is calculated by the molecular simulation process under the conditions of normal pressure and normal temperature, being equal to shale gas can flow freely greatly
Total shale gas molecular number N in holeLarge(can obtain from molecular dynamics simulation) can free flow divided by the shale gas of simulation
Move macroporous total volume, wherein the shale gas in rock per ton can flow freely in macrovoid shale gas molecular number be equal to ε ×
VP, HC×nLarge/NA。
Then, the calculation method of the impacted nanoaperture of shale flow of air is illustrated.In this example, shale flow of air
The calculating of impacted nanoaperture reserves is increasingly complex, and this method first simulates that shale flow of air in shale reservoir is impacted to be received
Metre hole gap is based on above-mentioned reservoir pore space size distribution curve, if the impacted nanoaperture of all shale flow of air is divided into
Dry specific dimensions nanoaperture area, calculates the reserves in each specific dimensions nanoaperture area, by accumulating operation, obtains shale
The gross reserves of the impacted nanoaperture of flow of air.
Specifically, the flowable nanoaperture gross reserves of shale gas can be calculated using above-mentioned formula (7).Wherein, GNano
Indicate the reserves of the impacted nanoaperture of shale flow of air, GNano, iIndicate the shale gas in specific dimensions nanoaperture area
Reserves, i indicate the serial number in specific dimensions nanoaperture area, and m indicates the total quantity in specific dimensions nanoaperture area.
Calculating below for specific dimensions nanoaperture area reserves is further described.
Firstly, needing to obtain each specific dimensions based on the data in reservoir pore space size distribution curve and receive with reference to Fig. 4
The volume in metre hole gap area, and indicated using formula (8).Wherein, VP, Nano, iIndicate the volume in specific dimensions nanoaperture area,
VNano%, iIndicate the pore volume fraction in specific dimensions nanoaperture area.
Then, it is determined that the quantity for the nanoaperture for being included in each specific dimensions nanoaperture area, and utilize formula (9) table
Show.Wherein, ξiIndicate the quantity of nanoaperture in specific dimensions nanoaperture area, V0, iIt indicates in specific dimensions nanoaperture area
The volume of the impacted nanoaperture of the single shale flow of air simulated.In this example, the simulating shape of nanoaperture is circle
Cylinder, then its single pore volume is V0, i=π r2L, wherein r indicates the bottom of the impacted nanoaperture of simulation shale flow of air
Radius surface, L indicate the length of the impacted nanoaperture of simulation shale flow of air.
Then, according to the simulated experiment of the above-mentioned nanoaperture impacted for shale flow of air, it can determine each spy
Shale gas molecular number in scale cun nanoaperture area in the impacted nanoaperture of shale flow of air, to obtain specific dimensions
In nanoaperture area in nanoaperture hydrocarbon molecules volume, that is, complete be directed to specific dimensions nanoaperture area reserves calculating,
And the reserves in specific dimensions nanoaperture area are calculated using above-mentioned formula (9).Wherein, NNano, iIndicate specific dimensions nanoaperture
Shale gas molecular number in area in the impacted nanoaperture of shale flow of air.
Finally, formula (10) is brought into formula (7), the nano-pore that shale flow of air is impacted in shale reservoir is obtained
The calculating formula (formula 11) of the gross reserves of gap.Wherein, parameter nNano, iIndicate the impacted nano-pore of unit volume shale flow of air
Shale gas molecular number in gap.
In the embodiment of the present application, when completing the free flowable macrovoid of shale gas and shale flow of air is impacted receives
After the reserves of metre hole gap calculate, the two is subjected to accumulating operation, obtains the gross reserves of shale reservoir.Specifically, using above-mentioned
Formula (12) is calculated, and further, above-mentioned formula (6) and formula (11) is updated to respectively in formula (12), and according to Ah
Constant known to Fo Jiadeluo constant, shale gas gas constant, normal pressure and normal temperature etc., obtains in final shale reservoir
The calculation expression (as shown in formula 13) of gross reserves.By calculating, in this example, gross reserves is 3.53sm in shale reservoir3/
ton。
In addition, the application also proposed a kind of unconventional oil and gas Reserves Calculation System.
Fig. 5 is the unconventional oil and gas Reserves Calculation System structural schematic diagram of the embodiment of the present application.As shown in figure 5, the calculating
System has volume integral computing module 51 and reserves computing module 52.Wherein, volume integral computing module 51, according to reservoir
The pore structure of rock flows freely macrovoid (right below for what the active porosity in reservoir was divided into unconventional oil and gas
" the flowing freely macrovoid of unconventional oil and gas " is referred to as in the explanation of unconventional oil and gas Reserves Calculation System " flowable big
Hole ") and unconventional oil and gas the impacted nanoaperture of flowing (in the explanation below to unconventional oil and gas Reserves Calculation System
It is middle that " the impacted nanoaperture of the flowing of unconventional oil and gas " is referred to as " nanoaperture "), it determines and distinguishes flowable macrovoid
With the hole boundary value of nanoaperture, and the volume fraction that both holes respectively account for active porosity is obtained.
Specifically, first above-mentioned volume integral computing module 51 is illustrated.Volume integral computing module 51, according to meter
Calculation process is divided into such as lower unit: porosity amending unit 511, hole boundary value computing unit 512 and pore volume fraction obtain
Unit 513.
In this example, porosity amending unit 511 classifies the hole in reservoir rock, and analyzes active porosity
Composition corrects porosity parameter.In general, the hole of reservoir be divided into the free flowable macrovoid of unconventional oil and gas, flowing by
Hole that nanoaperture that adsorbed gas influences, water occupy, several class holes such as can not flow hole, and utilize above-mentioned formula (1)
It is indicated.Wherein, in several class holes of above-mentioned reservoir rock, the hole due to that can store unconventional oil and gas is reservoir
Active porosity, therefore it is big that active porosity can be divided into flowing freely for unconventional oil and gas according to the pore structure of reservoir rock
The impacted nanoaperture of the flowing of hole and unconventional oil and gas, therefore, after formula (1) is classified according to pore structure,
Above-mentioned simplified formula (2) and formula (3) are obtained, to complete the amendment to effecive porosity parameter.
In hole boundary value computing unit 512, which based on above-mentioned analysis and correction result, utilizes reservoir rock
The intermolecular absorption principle of unconventional oil and gas in stone calculates the hole boundary value for distinguishing flowable macrovoid and nanoaperture.Tool
Body, hole boundary value computing unit 512 is completed to calculate according to the experimental method for determining hole boundary value in above-mentioned steps S120,
This will not be repeated here.
Finally, being illustrated for pore volume fraction acquiring unit 513.Pore volume fraction acquiring unit 513, base
In the relationship of pore-size and the volume fraction of same size hole, reservoir pore space size distribution curve is drawn, and according to hole
What boundary value obtained unconventional oil and gas flows freely macroporous volume fraction.After completing hole boundary value and calculating, according to
The pore volume fraction that data content shown in Fig. 4 will be greater than hole boundary value is integrated, and can be obtained can in reservoir rock
Flow the volume fraction ε of active porosity shared by macrovoid, wherein ε expression unconventional oil and gas flows freely macrovoid volume
Score.
Referring again to FIGS. 5, being described in detail below for reserves computing module 52.Reserves computing module 52 utilizes
The volume fraction of flowable macrovoid and nanoaperture calculates separately the reserves of both holes, completes shale reservoir gross reserves
Calculating.Wherein, which has macrovoid reserves computing unit 521, nanoaperture finimeter according to above-mentioned classification situation
Calculate unit 522 and gross reserves computing unit 523.
Firstly, being illustrated to macrovoid reserves computing unit 521.Macrovoid reserves computing unit 521, basis can flow
Unconventional oil and gas molecular number in dynamic macrovoid and the active porosity volume in reservoir rock are calculated using the equation of gas state
Unconventional oil and gas flows freely macroporous reserves.Specifically, it is based on known rock density parameter, by above-mentioned formula
(2), formula (3) obtains formula (4) and formula (5) divided by the density of rock, is based on this, and calculates effective reservoir in conjunction with Fig. 2
Pore volume.After the volume of active porosity in above-mentioned shale reservoir has been determined, according to active porosity volume and flowable big
Unconventional oil and gas molecular number in hole utilizes state equation again, obtains the hydrocarbon molecules being stored in flowable macrovoid
Volume, thus formula (6) calculate unconventional oil and gas flow freely macroporous reserves.
522 in nanoaperture reserves computing unit, the unit 522 simulate reservoir pore space in unconventional oil and gas flowing by
The nanoaperture of influence is based on reservoir pore space size distribution curve, it is specific that nanoapertures all in reservoir is divided into several
Sized nanostructures hole area, obtains the reserves in each specific dimensions nanoaperture area, after cumulative, completes the stream of unconventional oil and gas
Move the calculating of impacted nanoaperture gross reserves.Specifically, first based in reservoir pore space size distribution curve as shown in Figure 4
Each pore volume fraction, obtain the volume in each specific dimensions nanoaperture area according to above-mentioned formula (8)；Then, public affairs are utilized
Formula (9) determines the quantity of nanoaperture in each specific dimensions nanoaperture area, and obtains nano-pore in corresponding region by experiment
Unconventional oil and gas molecular number in gap further obtains the reserves in specific dimensions nanoaperture area by above-mentioned formula (10)；From
And nanoaperture gross reserves is calculated using formula (7) or (11).
Finally, gross reserves computing unit 523 will be from macrovoid reserves computing unit 521 and nanoaperture reserves computing unit
522 calculated results got are added, reference formula (12) and/or formula (13), are obtained the final unconventional oil and gas that is directed to and are stored up
The gross reserves of layer.
The invention proposes a kind of Reserve Estimation Methods of unconventional oil and gas for considering nanoaperture, have modified active porosity
Parameter is spent, reservoir pore space is divided into the nanoaperture that the macrovoid, flowing that unconventional oil and gas can flow freely are influenced by adsorbed gas,
And reserves are calculated separately for both holes, and then obtain the gross reserves of reservoir rock, no longer only with reference to single porosity
Constant plays an important role to shale reservoir finimeter calculator so that the calculated result of gross reserves is more accurate.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope disclosed by the invention, any changes or substitutions that can be easily thought of by any those skilled in the art, should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of unconventional oil and gas Reserve Estimation Method, which is characterized in that this method comprises the following steps:
Hole partiting step, according to RESERVOIR PORE STRUCTURE, by the active porosity in reservoir be divided into unconventional oil and gas can be free
The impacted nanoaperture of the flowing of flowing macrovoid and unconventional oil and gas, determines and distinguishes the macrovoid and the nanoaperture
Hole boundary value, and obtain the macrovoid and the nanoaperture respectively accounts for the volume fraction of active porosity；
Reserves calculate step, and the volume fraction of active porosity is respectively accounted for using the macrovoid and the nanoaperture, is calculated separately
The reserves of unconventional oil and gas in both holes complete the calculating of reservoir rock gross reserves.
2. calculation method according to claim 1, which is characterized in that the hole partiting step further comprises walking as follows
It is rapid:
Hole in reservoir rock is classified, and analyzes the composition of wherein active porosity, corrects porosity parameter；
It calculates using the intermolecular absorption principle of unconventional oil and gas in reservoir pore space based on correction result and distinguishes the macrovoid
With the hole boundary value of the nanoaperture；
Relationship based on pore-size Yu the volume fraction of same size hole draws reservoir pore space size distribution curve, and root
The macroporous volume fraction is obtained according to the hole boundary value.
3. calculation method according to claim 1 or 2, which is characterized in that calculated in step in the reserves, according to described
The active porosity volume of unconventional oil and gas molecular number and reservoir rock in macrovoid, using the equation of gas state, described in calculating
Macroporous unconventional oil and gas reserves.
4. calculation method according to claim 3, which is characterized in that calculated in step in the reserves, utilize such as following table
The macroporous reserves are calculated up to formula:
Wherein, GLargeIndicate that the macroporous unconventional oil and gas reserves, ε indicate the macroporous volume fraction, VP, HCTable
Show the total volume of active porosity described in reservoir rock, nLargeIndicate the unconventional oil and gas point in unit volume in the macrovoid
Subnumber, NAIndicate that Avogadro constant number, R indicate the gas constant of unconventional oil and gas, TSCIndicate normal temperature, pSCExpression standard
Pressure.
5. calculation method according to claim 1 or 2, which is characterized in that calculated in step in the reserves, simulate reservoir
All nanoapertures are divided into several spies based on different reservoir pore space sizes by the nanoaperture in rock
Scale cun nanoaperture area, obtains the reserves in each specific dimensions nanoaperture area, described in completing after accumulating operation
The calculating of nanoaperture gross reserves.
6. calculation method according to claim 5, which is characterized in that calculated in step in the reserves, by walking as follows
Suddenly the unconventional oil and gas reserves in each specific dimensions nanoaperture area are obtained:
Based on the reservoir pore space size distribution curve, the volume in each specific dimensions nanoaperture area is obtained；
Determine in each specific dimensions nanoaperture area nano-pore in the quantity of the nanoaperture and corresponding region
Unconventional oil and gas molecular number in gap further obtains the unconventional oil and gas reserves in specific dimensions nanoaperture area.
7. calculation method according to claim 6, which is characterized in that calculated in step in the reserves, utilize such as following table
The unconventional oil and gas reserves in specific dimensions nanoaperture area are calculated up to formula:
Wherein, GNano, iIndicate the unconventional oil and gas reserves in specific dimensions nanoaperture area, NNano, iIndicate the specific ruler
Unconventional oil and gas molecular number in very little nanoaperture area in the nanoaperture, i indicate specific dimensions nanoaperture area
Serial number, NAIndicate that Avogadro constant number, R indicate the gas constant of unconventional oil and gas, TSCIndicate normal temperature, pSCExpression standard
Pressure, ξiIndicate the quantity of the nanoaperture in specific dimensions nanoaperture area.
8. a kind of unconventional oil and gas Reserves Calculation System, which is characterized in that the system includes the following modules:
Active porosity in reservoir is divided into unconventional oil and gas according to RESERVOIR PORE STRUCTURE by volume integral computing module
The impacted nanoaperture of the flowing of macrovoid and unconventional oil and gas can be flowed freely, is determined and is distinguished the macrovoid and described receive
The hole boundary value of metre hole gap, and obtain the macrovoid and the nanoaperture respectively accounts for the volume fraction of active porosity；
Reserves computing module is respectively accounted for the volume fraction of active porosity using the macrovoid and the nanoaperture, counted respectively
The reserves of unconventional oil and gas in both holes are calculated, the calculating of reservoir rock gross reserves is completed.
9. computing system according to claim 8, which is characterized in that the volume integral computing module includes:
Porosity amending unit, the hole in reservoir rock is classified, and analyzes the composition of wherein active porosity, amendment
Porosity parameter；
Hole boundary value computing unit is based on correction result, former using the intermolecular absorption of unconventional oil and gas in reservoir pore space
Reason calculates the hole boundary value for distinguishing the macrovoid and the nanoaperture；
Pore volume fraction acquiring unit, the relationship based on pore-size Yu the volume fraction of same size hole draw storage
Layer pore size distribution curve, and the macroporous volume fraction is obtained according to the hole boundary value.
10. computing system according to claim 8 or claim 9, which is characterized in that the reserves computing module further comprises:
Macrovoid reserves computing unit, according in the macrovoid unconventional oil and gas molecular number and reservoir rock it is effective
Pore volume calculates the macroporous unconventional oil and gas reserves using the equation of gas state；
Nanoaperture reserves computing unit simulates the nanoaperture in reservoir rock, based on different reservoir pore space rulers
It is very little, all nanoapertures are divided into several specific dimensions nanoaperture areas, obtain each specific dimensions nanometer
The reserves in hole area, by the calculating for completing the nanoaperture gross reserves after accumulating operation.
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