CN106326549B - Determine the method and system of straight well shale gas reservoir formation parameter - Google Patents
Determine the method and system of straight well shale gas reservoir formation parameter Download PDFInfo
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Abstract
The embodiment of the invention provides a kind of method and systems of determining straight well shale gas reservoir formation parameter, wherein this method comprises: setting initial formation parameter；It is calculated according to initial formation parameter by simulation, obtains bottom pressure, draw the theoretical curve of bottom pressure, drop of pressure and pressure derivative；Above-mentioned theory curve and corresponding measured curve are fitted, fitting result is obtained；If fitting result meets default required precision, initial formation parameter is determined as actual formation parameter；If being unsatisfactory for default required precision, initial formation parameter is corrected according to pseudoradial flow and pseudo-linear stream, required precision is preset until fitting result meets, the initial formation parameter after correction is determined as actual formation parameter.It since the program determines formation parameter according to pseudoradial flow and pseudo-linear stream, thus solves and determines slow-footed technical problem existing for unstable state well-logging method, achieved the purpose that quick, accurate determining straight well shale gas reservoir formation parameter.
Description
Technical field
The present invention relates to Reservoir Development technical field, in particular to a kind of side of determining straight well shale gas reservoir formation parameter
Method and system.
Background technique
In practical Reservoir Development, shale gas reservoir is generally referred to as the more difficult gas of geological storage complicated condition, exploitation
Hiding.During specific oil-gas exploration, the correlation circumstance of accurate description shale gas reservoir is of great significance in actual production,
And the geologic parameter of shale gas reservoir is a significant data for describing the correlation circumstance of shale gas reservoir.Wherein, due to straight well
The geologic parameter of the characteristic of itself, straight well shale gas reservoir generally comprises: parameter is adsorbed on stratum, and (such as gas absorption pressure and gas are inhaled
Attached amount etc.), in-place permeability, skin factor, porosity and boundary parameter (such as boundary types and boundary sizes) etc..For standard
How the really correlation circumstance of description straight well shale gas reservoir accurately and rapidly determines that the formation parameter of straight well shale gas reservoir is always
The problem of one people pays special attention to.
The formation parameter of straight well shale gas reservoir is presently mainly determined by unstable state well-logging method, the unstable state well testing
Method can be generally divided into conventional well testing and Modern test well, but the ground of straight well shale gas reservoir is mostly mainly determined by radial flow
Layer parameter.Wherein, the bottom pressure that actual measurement is usually drawn in conventional well testing in rectangular co-ordinate or semilog coordinate becomes at any time
The straightway of change, using the slope of the straightway come the formation parameter of reverse shale gas reservoir；And Modern test well is managed according to seepage flow
By the shaft bottom dimensionless pressure calculated under given parameters to the curve of nondimensional time, referred to as theoretical plate, then will survey bent
Line is fitted with theoretical plate, and the formation parameter of shale gas reservoir is determined with this.
However, when it is implemented, because unstable state well-logging method it needs to be determined that radial flow, result in by non-steady
State well-logging method determines shale gas reservoir formation parameter, often there is determination process trouble, determines slow-footed problem.
In view of the above-mentioned problems, currently no effective solution has been proposed.
Summary of the invention
The embodiment of the invention provides a kind of method and systems of determining straight well shale gas reservoir formation parameter, to reach quick
Determine the purpose of the straight well shale gas reservoir formation parameter.
The embodiment of the invention provides a kind of methods of determining straight well shale gas reservoir formation parameter, comprising:
Set the initial formation parameter of straight well shale gas reservoir；
Simulation calculating is carried out according to the initial formation parameter, obtains the bottom pressure of the shale gas reservoir, and according to institute
Bottom pressure is stated, bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve are drawn；
By the bottom pressure theoretical curve and bottom pressure measured curve, bottom pressure landing theoretical curve and well
Bottom pressure landing measured curve, the bottom pressure derivative theoretical curve and bottom pressure derivative measured curve are intended respectively
It closes, obtains fitting result；
If the fitting result meets default required precision, the initial formation parameter is determined as the shale gas
The actual formation parameter of hiding；
If the fitting result is unsatisfactory for default required precision, according to the pseudo-radial of bottom pressure derivative theoretical curve
Stream and pseudo-linear stream carry out one or many correct operations to the initial formation parameter, until based on the initial stratum after correction
The fitting result that parameter obtains meets the default required precision, and the initial formation parameter after correction is determined as the shale
The actual formation parameter of gas reservoir.
In one embodiment, simulation calculating is carried out according to the initial formation parameter, obtains the well of the shale gas reservoir
Bottom pressure, and according to the bottom pressure, draw bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure
Derivative theoretical curve, comprising:
Obtain the initial condition parameters of the shale gas reservoir and the wellbore parameters of the shale gas reservoir；
By the first of the initial condition parameters of the shale gas reservoir, the wellbore parameters of the shale gas reservoir and the shale gas reservoir
Parameter sets of the beginning formation parameter as the shale gas reservoir；
Establish the flow model of the shale gas reservoir；
Determine pit shaft type, production method and the working condition of the shale gas reservoir；
According to the parameter sets, the flow model, the pit shaft type, the production method and the production are utilized
Condition carries out simulation calculating, obtains the bottom pressure of the shale gas reservoir；
According to the bottom pressure, drafting obtains the bottom pressure theoretical curve, the theoretical song of bottom pressure landing
Line and the bottom pressure derivative theoretical curve.
In one embodiment, the flow model of the shale gas reservoir is established, comprising:
The initial flow model of the shale gas reservoir is modified according to apparent permeability formula and Darcy's law, will be corrected
First correction model of the initial flow model of shale gas reservoir afterwards as the shale gas reservoir；
By establishing single-component gas adsorption equation, the first correction model of the shale gas reservoir is adjusted, is obtained
Second correction model of the shale gas reservoir；
According to the principle of mass conservation, the second correction model of the shale gas reservoir is adjusted, by what is obtained after adjustment
Flow model of second correction model of the shale gas reservoir as the shale gas reservoir.
In one embodiment, the correct operation includes:
The initial formation parameter is adjusted according to the pseudoradial flow of the bottom pressure derivative theoretical curve and pseudo-linear stream,
Initial formation parameter after being corrected；
According to the initial formation parameter after the correction, calculated by simulation, after obtaining the correction of the shale gas reservoir
Bottom pressure, and draw correction after bottom pressure theoretical curve, after correction bottom pressure landing theoretical curve and correction after
Bottom pressure derivative theoretical curve；
By the bottom pressure theoretical curve after the correction and the shaft bottom after the bottom pressure measured curve, the correction
Drop of pressure theoretical curve and bottom pressure landing measured curve, the bottom pressure derivative theoretical curve after the correction and
The bottom pressure derivative measured curve is fitted respectively, obtains the fitting knot obtained based on the initial formation parameter after correction
Fruit.
In one embodiment, institute is adjusted according to the pseudoradial flow of the bottom pressure derivative theoretical curve and pseudo-linear stream
Initial formation parameter is stated, the initial formation parameter after being corrected, comprising:
It is respectively compared the bottom pressure theoretical curve and the bottom pressure measured curve, the bottom pressure landing reason
By curve and bottom pressure landing measured curve, the bottom pressure derivative theoretical curve and the bottom pressure derivative are real
Theoretical curve is surveyed, comparison result is obtained；
According to the pseudoradial flow and pseudo-linear stream of the comparison result and the bottom pressure derivative theoretical curve, institute is adjusted
Initial formation parameter is stated, the initial formation parameter after being corrected.
In one embodiment, the initial formation parameter includes at least one of: adsorbing parameter, stratum infiltration in stratum
Rate, skin factor and porosity.
In one embodiment, in the case where the initial formation parameter includes the stratum absorption parameter, according to institute
Comparison result is stated, the formation parameter is adjusted, comprising:
It is bent to be higher than bottom pressure derivative actual measurement in the position of the pseudoradial flow of the bottom pressure derivative theoretical curve
In the case where the position of the pseudoradial flow of line, reduce the stratum absorption parameter；
It is bent lower than bottom pressure derivative actual measurement in the position of the pseudoradial flow of the bottom pressure derivative theoretical curve
In the case where the position of the pseudoradial flow of line, increase the stratum absorption parameter.
In one embodiment, in the case where the initial formation parameter includes the in-place permeability, according to described
Comparison result adjusts the in-place permeability, comprising:
It is bent to be less than bottom pressure derivative actual measurement in the length of the pseudoradial flow of the bottom pressure derivative theoretical curve
In the case where the length of the pseudoradial flow of line, then reduce the in-place permeability；
It is bent to be greater than bottom pressure derivative actual measurement in the length of the pseudoradial flow of the bottom pressure derivative theoretical curve
In the case where the length of the pseudoradial flow of line, then increase the in-place permeability.
In one embodiment, in the case where the initial formation parameter includes the skin factor, according to the ratio
Compared with as a result, adjusting the skin factor, comprising:
In the pseudoradial flow of the bottom pressure derivative theoretical curve and the alternate position spike of pseudo-linear stream and the bottom pressure
In the case that the difference of the alternate position spike of derivative measured curve pseudoradial flow and pseudo-linear stream is greater than preset threshold, then the table is adjusted
The skin factor.
In one embodiment, in the case where the initial formation parameter includes the porosity, according to the comparison
As a result, adjusting the porosity, comprising:
In the pseudoradial flow of the bottom pressure derivative theoretical curve and the alternate position spike of pseudo-linear stream and the bottom pressure
In the case that the difference of the alternate position spike of derivative measured curve pseudoradial flow and pseudo-linear stream is less than preset threshold, then the hole is adjusted
Porosity.
Based on identical inventive concept, the embodiment of the invention also provides a kind of determining straight well shale gas reservoir formation parameters
System, comprising:
Initial setting module, for setting the initial formation parameter of straight well shale gas reservoir；
Simulation calculation module obtains the shale gas reservoir for carrying out simulation calculating according to the initial formation parameter
Bottom pressure, and according to the bottom pressure, draw bottom pressure theoretical curve, bottom pressure landing theoretical curve and shaft bottom pressure
Power derivative theoretical curve；
Fitting module, for dropping the bottom pressure theoretical curve and bottom pressure measured curve, the bottom pressure
It falls theoretical curve and bottom pressure landing measured curve, the bottom pressure derivative theoretical curve and the actual measurement of bottom pressure derivative is bent
Line is fitted respectively, obtains fitting result；
Determining module, if the fitting result meets default required precision, for the initial formation parameter is true
It is set to the actual formation parameter of the shale gas reservoir；If the fitting result is unsatisfactory for default required precision, it to be used for basis
The pseudoradial flow and pseudo-linear stream of bottom pressure derivative theoretical curve carry out one or many corrections to the initial formation parameter
Operation, until the fitting result obtained based on the initial formation parameter after correction meets the default required precision, and will correction
Initial formation parameter afterwards is determined as the actual formation parameter of the shale gas reservoir.
In the embodiment of the present invention, by the pseudoradial flow and pseudo-linear stream of bottom pressure derivative theoretical curve to set
The initial formation parameter of shale gas reservoir is pointedly corrected, and determines actual formation parameter, is avoided using radial flow, from
And it solves and existing determining formation parameter process during shale gas reservoir formation parameter is determined by unstable state well-logging method
Trouble, determination process the technical issues of time-consuming, achieved the purpose that quickly, accurate determine straight well shale gas reservoir formation parameter.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, not
Constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is the method process flow diagram of determining straight well shale gas reservoir formation parameter according to an embodiment of the present invention；
Fig. 2 is that operation processing stream is corrected in the method for determining straight well shale gas reservoir formation parameter according to an embodiment of the present invention
Cheng Tu；
Fig. 3 is the system structure diagram of determining straight well shale gas reservoir formation parameter according to an embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, right below with reference to embodiment and attached drawing
The present invention is described in further details.Here, exemplary embodiment and its explanation of the invention is used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
In view of the unstable state well-logging method mainly used at present is mostly the stratum for determining shale gas reservoir according to radial flow
Parameter, in the specific implementation, the process due to determining radial flow are often more troublesome, and time-consuming, therefore cause by non-steady
State well-logging method determine the process of shale gas reservoir formation parameter there are determination process trouble, determine slow-footed problem.In fact,
In shale gas adsorption and desorption, bottom pressure derivative there is also pseudoradial flow (adsorbing the radial flow of induction) and quasi- line
Property stream (adsorbing the linear flow of induction).Above-mentioned pseudoradial flow and pseudo-linear stream and the formation parameter for the shale gas reservoir studied have
Close ties the formation parameter of shale gas reservoir can be determined by pseudoradial flow and pseudo-linear stream using this connection, and
And it is more readily determined compared to radial flow, pseudoradial flow and pseudo-linear stream, while determination process time-consuming is also shorter.Based on above-mentioned
Situation, in order to solve the problems, such as that determination process existing in the prior art is troublesome, it is slow-footed to determine, stratum can be added in consideration
Adsorbed gas obtains pseudoradial flow and pseudo-linear stream using corresponding properties, so as to according to pseudoradial flow and pseudo-linear stream to page
The formation parameter of rock gas reservoir is quickly determined.
Based on above-mentioned thinking, and consider the concrete property of straight well, the embodiment of the invention provides a kind of determining straight well pages
The method of rock gas reservoir formation parameter, as shown in Figure 1, may include:
Step 101: the initial formation parameter of setting straight well shale gas reservoir；
When it is implemented, being directed to straight well shale gas reservoir, it is contemplated that the correlation properties of straight well, by step 101 according to specific
Performance is set to stratum absorption parameter, in-place permeability, skin factor and porosity respectively in conjunction with related surveying and mapping data
Initial value completes the setting to the initial formation parameter of straight well shale gas reservoir.
Step 102: simulation calculating being carried out according to initial formation parameter, obtains the bottom pressure of shale gas reservoir, and according to well
Bottom pressure draws bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve；
When it is implemented, in order to draw above-mentioned bottom pressure theoretical curve, bottom pressure landing theoretical curve and shaft bottom
Pressure derivative theoretical curve, needs that bottom pressure is calculated by simulation, draws above-mentioned theory curve further according to bottom pressure,
And carry out simulation calculating process not only need to use the initial formation parameter that front is set also need to obtain other relevant parameters,
Model and condition.In a specific embodiment, bottom pressure theoretical curve, bottom pressure can be drawn according to the following steps
Land theoretical curve and bottom pressure derivative theoretical curve:
S1: the initial condition parameters of shale gas reservoir and the wellbore parameters of shale gas reservoir are obtained；
S2: the initial stratum of the initial condition parameters of shale gas reservoir, the wellbore parameters of shale gas reservoir and shale gas reservoir is joined
Parameter sets of the number as shale gas reservoir；
S3: the flow model of shale gas reservoir is established；
S4: pit shaft type, production method and the working condition of shale gas reservoir are determined；
S5: according to parameter sets, carrying out simulation calculating using flow model, pit shaft type, production method and working condition,
Obtain the bottom pressure of shale gas reservoir；
S6: according to bottom pressure, drafting obtains bottom pressure theoretical curve, bottom pressure landing theoretical curve and shaft bottom pressure
Power derivative theoretical curve.
That is, in order to enable obtained bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative
Theoretical curve is more proper, during drafting, has also used the initial condition parameters of shale gas reservoir, the pit shaft of shale gas reservoir
Parameter, the initial formation parameter of shale gas reservoir, the flow model of shale gas reservoir, the pit shaft type of shale gas reservoir, production method and
Working condition etc..Because participating in, the parameter for calculating and drawing is more, so that it is more proper actual to draw obtained curve
Formation conditions.
It should be noted that in order to obtain and determine that the stratum of shale gas reservoir is joined using pseudoradial flow and pseudo-linear stream
Adsorbed gas is added in number, consideration in the earth formation, to determine stratum using the correlation properties having in shale gas adsorption and desorption
Parameter, so needing foundation that there is above-mentioned characteristic and the flow model of the shale gas reservoir of pseudoradial flow and pseudo-linear stream can be obtained.
Specifically, the process of the flow model for the shale gas reservoir established in above embodiment may include: according to apparent permeability formula
It is modified with initial flow model of the Darcy's law to shale gas reservoir, the initial flow model of revised shale gas reservoir is made
For the first correction model of shale gas reservoir；By establishing single-component gas adsorption equation, to the first correction model of shale gas reservoir
It is adjusted, obtains the second correction model of shale gas reservoir；According to the principle of mass conservation, to the second correction model of shale gas reservoir
It is adjusted, using the second correction model of the shale gas reservoir obtained after adjustment as the flow model of shale gas reservoir.
The flow model for the shale gas reservoir established through the above steps, due to considering shale gas adsorption and desorption
When characteristic, therefore pseudoradial flow and pseudo-linear stream can be obtained, to can use in subsequent processing step through this
It is theoretical that the flow model of shale gas reservoir obtains bottom pressure theoretical curve, bottom pressure derivative theoretical curve and bottom pressure landing
Curve solves to obtain pseudoradial flow and pseudo-linear stream further according to above-mentioned curve.
Darcy's law in above-described embodiment is linear between the percolation flow velocity and hydraulic slope of water in description saturated soil
The rule of relationship, also known as linear seepage flow law.That is seepage discharge Q is with upstream and downstream head difference (h2-h1) and perpendicular to water (flow) direction
Sectional area A is directly proportional, and is inversely proportional with seepage flow length L, it may be assumed that Q=K*A* (h2-h1)/L.Q is unit time seepage discharge, F in formula
For the cross-section of river, h is gross head loss, and L is percolation path length, and I=h/L is hydraulic gradient, and K is infiltration coefficient.Relational expression
Show that water is inversely proportional within the unit time by the seepage discharge of porous media and percolation path length, with discharge section area and
Gross head loss is directly proportional.From hydraulics it is known that being equal to the product of flow velocity v and cross-section of river F by the flow Q of a certain section,
That is Q=Fv.This law illustrate water by the speed of porous media with the size of hydraulic gradient and the permeance property of medium at just
Than.However, the law is not fully suitable for the flow model of the shale gas reservoir of actual treatment, it is therefore desirable in conjunction with apparent permeability
The first correction model is obtained, but since there is also deficiencies for above-mentioned first correction model, so also needing further to be repaired
Positive processing, finally obtains the flow model of shale gas reservoir used in the embodiment of the present invention.
Step 103: by bottom pressure theoretical curve and bottom pressure measured curve, bottom pressure landing theoretical curve and well
Bottom pressure landing measured curve, bottom pressure derivative theoretical curve and bottom pressure derivative measured curve are fitted respectively, are obtained
To fitting result；
Specifically, so-called fitting is exactly by bottom pressure theoretical curve and bottom pressure measured curve, well in step 103
Bottom pressure landing theoretical curve and bottom pressure landing measured curve, bottom pressure derivative theoretical curve and bottom pressure derivative are real
It surveys curve and is compared fitting respectively, obtain the error between notional result and measured result, as above-mentioned fitting result.
After obtaining specific fitting result by step 103, which is analyzed, can tentatively understand theoretical mould
Gap between quasi- result and measured result, and this gap be often initial formation parameter by initially setting up mostly with it is actual
There are caused by deviation between formation parameter.In order to be corrected to the initial formation parameter initially set up close to actual formation parameter,
It is contemplated that being correction foundation with the fitting result, initial formation parameter is adjusted, is wanted until fitting result reaches preset precision
It asks, specific analysis and processing can be as described in below step 104 and steps 105.
Step 104: if fitting result meets default required precision, initial formation parameter being determined as shale gas reservoir
Actual formation parameter；
Step 105: if fitting result is unsatisfactory for default required precision, according to the quasi- of bottom pressure derivative theoretical curve
Radial flow and pseudo-linear stream carry out one or many correct operations to initial formation parameter, until based on the initial stratum after correction
The fitting result that parameter obtains meets default required precision, and the initial formation parameter after correction is determined as to the reality of shale gas reservoir
Border formation parameter.
In a specific embodiment, above-mentioned correct operation specifically can be as shown in Figure 2, comprising:
Step 201: initial formation parameter is adjusted according to the pseudoradial flow of bottom pressure derivative theoretical curve and pseudo-linear stream,
Initial formation parameter after being corrected；
Step 202: according to the initial formation parameter after correction, being calculated by simulation, after obtaining the correction of shale gas reservoir
Bottom pressure, and draw correction after bottom pressure theoretical curve, after correction bottom pressure landing theoretical curve and correction after
Bottom pressure derivative theoretical curve；
Step 203: by the bottom pressure theoretical curve after correction and the bottom pressure after bottom pressure measured curve, correction
Bottom pressure derivative theoretical curve and bottom pressure derivative after landing theoretical curve and bottom pressure landing measured curve, correction
Measured curve is fitted respectively, obtains the fitting result obtained based on the initial formation parameter after correction.
After the fitting result that initial formation parameter after obtaining based on correction obtains, then to judge whether the result meets default
Required precision illustrates to calculate by using the initial formation parameter after correction by simulation if meeting default required precision
The theoretical curve of acquisition differs smaller with measured curve, error within an acceptable range, thus may determine that in the step
Initial formation parameter after correction is actual formation parameter；If being unsatisfactory for default required precision, illustrate after correcting initially
There are also gaps between layer parameter and actual formation parameter, can repeat one or many similar correct operations, until
Last fitting result meets default required precision, and the initial formation parameter after at this moment again correcting last time is determined as reality
Formation parameter.
In above-described embodiment, when specific operation, in order to accurately and efficiently adjust initial formation parameter, after obtaining correction
Initial formation parameter, can by step 102 draw obtain bottom pressure theoretical curve, bottom pressure landing theoretical curve and
Bottom pressure derivative theoretical curve is compared with the homologous thread of actual measurement, using specific comparison result as foundation, targetedly
Ground adjusts the specific corresponding parameter in initial formation parameter, and specific embodiment, which may is that, is respectively compared the theoretical song of bottom pressure
Line and bottom pressure measured curve compare bottom pressure landing theoretical curve and bottom pressure landing measured curve, compare shaft bottom
Pressure derivative theoretical curve and bottom pressure derivative survey theoretical curve, obtain comparison result；The ratio obtained according to above-mentioned steps
Compared with as a result, being corrected according to the pseudoradial flow of bottom pressure derivative theoretical curve and the initial formation parameter of pseudo-linear stream adjustment
Initial formation parameter afterwards.
Explanation is needed exist for, for the shale gas reservoir of straight well, above-mentioned initial formation parameter generally may include but unlimited
In at least one of: adsorbing parameter, in-place permeability, skin factor and porosity in stratum.On it should be noted, however, that
Stating cited formation parameter is only a kind of schematic description, is in order to better illustrate the present invention, in the process actually executed
In, it can also include the formation parameter of other corresponding straight well shale gas reservoirs, can be chosen according to the actual situation, the application
This is not construed as limiting.
It in a specific embodiment, as the case may be can be for each specific ginseng in above-mentioned initial formation parameter
Number (that is, stratum absorption parameter, in-place permeability, skin factor and porosity) is adjusted correspondingly respectively, to obtain school
Positive formation parameter, and then approach set initial formation parameter gradually by one or many corrections and be approximately equal to
Actual formation parameter.It should be noted that the adjustment for each design parameter in above-mentioned formation parameter, according to different situations
It needs to carry out different adjustment, just adsorbs parameter, in-place permeability, epidermis for the stratum in initial formation parameter respectively below
The factor and the specific adjustment mode of porosity are specifically described respectively.
1) parameter is adsorbed on adjustment stratum:
It is higher than the position of the pseudoradial flow of bottom pressure measured curve in the position of the pseudoradial flow of bottom pressure theoretical curve
In the case where setting, then reduce stratum absorption parameter；It is lower than bottom pressure in the position of the pseudoradial flow of bottom pressure theoretical curve
In the case where the position of the pseudoradial flow of measured curve, then increase stratum absorption parameter.
In the actual implementation process, it is higher than bottom pressure actual measurement song in the position of the pseudoradial flow of bottom pressure theoretical curve
In the case where the position of the pseudoradial flow of line, shaft bottom is mainly higher than with the position of the pseudoradial flow of above-mentioned bottom pressure theoretical curve
The position degree of the pseudoradial flow of pressure measured curve is foundation, can reduce absorption ginseng in stratum according to preset ratio amplitude
Number, makes the position of the pseudoradial flow of bottom pressure theoretical curve as early as possible close to the position of the pseudoradial flow of bottom pressure measured curve
It sets, to quickly be adjusted rear satisfactory stratum absorption parameter.That is, work as the pseudoradial flow of bottom pressure theoretical curve
When position is very big higher than the degree of the position of the pseudoradial flow of bottom pressure measured curve, then in the base of initial stratum absorption parameter
On plinth, stratum absorption parameter is dramatically reduced；When the position of the pseudoradial flow of bottom pressure theoretical curve is higher than bottom pressure
When the degree very little of the position of the pseudoradial flow of measured curve, then on the basis of parameter is adsorbed on initial stratum, subtract by a small margin
Adsorb parameter in small stratum.Similar, it is lower than bottom pressure measured curve in the position of the pseudoradial flow of bottom pressure theoretical curve
Pseudoradial flow position in the case where, when specific adjustment, when the position of the pseudoradial flow of bottom pressure theoretical curve is lower than well
When the degree of the position of the pseudoradial flow of bottom pressure measured curve is very big, then on the basis of parameter is adsorbed on initial stratum, substantially
Degree ground increases stratum and adsorbs parameter；When the position of the pseudoradial flow of bottom pressure theoretical curve is lower than bottom pressure measured curve
When the degree very little of the position of pseudoradial flow, then on the basis of parameter is adsorbed on initial stratum, increase stratum absorption by a small margin
Parameter.By the adjustment of above-mentioned specific embodiment, so that realization is quick to the stratum absorption parameter in initial formation parameter, has
The adjustment of effect.
It should be noted, however, that the above-mentioned cited specific adjustment mode to stratum absorption parameter is only that one kind is shown
The description of meaning property, being can also include being based on above embodiment during actually executing in order to better illustrate the present invention
Other feasible adjustment modes, can specifically be chosen according to the actual situation, the application is not construed as limiting this.
2) in-place permeability is adjusted
It is less than the length of the pseudoradial flow of bottom pressure measured curve in the length of the pseudoradial flow of bottom pressure theoretical curve
In the case where degree, then reduce in-place permeability；It is real to be greater than bottom pressure in the length of the pseudoradial flow of bottom pressure theoretical curve
In the case where the length for surveying the pseudoradial flow of curve, then increase in-place permeability.In the actual implementation process, it is similar to above-mentioned reality
It applies to the adjustment mode of stratum absorption parameter in mode, with the length and bottom pressure of the pseudoradial flow of bottom pressure theoretical curve
Specific difference degree is foundation between the length of the pseudoradial flow of measured curve, is adjusted according to corresponding amplitude to in-place permeability
It is whole.Specific embodiment may include: when the length of the pseudoradial flow of bottom pressure theoretical curve is less than bottom pressure actual measurement song
The length of the pseudoradial flow of line, and when above-mentioned difference degree is larger, then on the basis of initial in-place permeability, significantly subtract
Small in-place permeability；When the length of the pseudoradial flow of bottom pressure theoretical curve is less than the pseudoradial flow of bottom pressure measured curve
Length, and when above-mentioned difference degree is smaller, then on the basis of initial in-place permeability, reduce stratum infiltration by a small margin
Rate；Equally, when the length of the pseudoradial flow of bottom pressure theoretical curve is greater than the length of the pseudoradial flow of bottom pressure measured curve
Degree, and when above-mentioned difference degree is larger, then on the basis of initial in-place permeability, significantly increase in-place permeability；When
The length of the pseudoradial flow of bottom pressure theoretical curve is greater than the length of the pseudoradial flow of bottom pressure measured curve, and above-mentioned phase
When poor degree is smaller, then on the basis of initial in-place permeability, increase in-place permeability by a small margin.Pass through above-mentioned specific reality
The adjustment of mode is applied, stratum infiltration in initial formation parameter is quickly and effectively adjusted to realize.However, noticeable
It is that it is to be better described that the above-mentioned cited specific adjustment mode to in-place permeability, which is only a kind of schematic description,
The present invention can also include other feasible adjustment modes based on above embodiment, specifically during actually executing
It can be chosen according to the actual situation, the application is not construed as limiting this.
3) skin factor and porosity are adjusted
Intend diameter in the pseudoradial flow of bottom pressure theoretical curve and the alternate position spike of pseudo-linear stream and bottom pressure measured curve
In the case where being greater than preset threshold to the difference of the alternate position spike of stream and pseudo-linear stream, then skin factor is adjusted；
Intend diameter in the pseudoradial flow of bottom pressure theoretical curve and the alternate position spike of pseudo-linear stream and bottom pressure measured curve
In the case where being less than preset threshold to the difference of the alternate position spike of stream and pseudo-linear stream, then the porosity is adjusted.
When specific adjustment, it is contemplated that cause the pseudoradial flow of bottom pressure theoretical curve and the position of pseudo-linear stream
It is had differences between difference and the difference and preset threshold of the alternate position spike of bottom pressure measured curve pseudoradial flow and pseudo-linear stream
Reason is more complicated, needs that the skin factor in initial formation parameter can be incrementally increased or reduced according to practical concrete condition
Or porosity, so that the alternate position spike of the pseudoradial flow of bottom pressure theoretical curve and pseudo-linear stream and bottom pressure measured curve are quasi-
The difference of the alternate position spike of radial flow and pseudo-linear stream is gradually close to preset threshold.To by the above-mentioned means, available and true
Fixed skin factor at this moment is the skin factor in the formation parameter after correction.
In the actual implementation process, in addition to being permeated above by the stratum absorption parameter in initial formation parameter, stratum
Rate, skin factor and porosity are adjusted, and outside the initial formation parameter after being corrected, can also be adjusted to other parameters
It is whole, such as: boundary parameter etc..When it is implemented, can be according to the deviation journey of above-mentioned three theoretical curves and three measured curves
Degree, correspondingly gradually adjusts boundary parameter, so that above-mentioned three theoretical curves move closer to corresponding three measured curves, until
The deviation of above-mentioned three theoretical curves and corresponding measured curve within an acceptable range, then determines boundary parameter at this time,
And above-mentioned boundary parameter is included in the initial formation parameter after correction.
In embodiments of the present invention, by the pseudoradial flow and pseudo-linear stream according to bottom pressure derivative theoretical curve to institute
Parameters are pointedly corrected in the initial formation parameter of the shale gas reservoir of setting, determine the school for meeting default required precision
Initial formation parameter after just is actual formation parameter, is avoided using radial stream process, to solve unstable state well testing side
Shale gas reservoir formation parameter cumbersome, determination process the technical issues of time-consuming are determined present in method, reached quickly, it is quasi-
Determine the purpose of straight well shale gas reservoir formation parameter.
Based on the same inventive concept, a kind of determining straight well shale gas reservoir formation parameter is additionally provided in the embodiment of the present invention
System, as described in the following examples.Due to determine the principle that solves the problems, such as of system of straight well shale gas reservoir formation parameter with it is true
It is similar to determine straight well shale gas reservoir formation parameter method, it is thus determined that the implementation of the system of shale gas reservoir formation parameter may refer to really
Determine the implementation of straight well shale gas reservoir formation parameter method, overlaps will not be repeated.It is used below, term " unit " or
The combination of the software and/or hardware of predetermined function may be implemented in " module ".Although device is preferably described in following embodiment
It is realized with software, but the realization of the combination of hardware or software and hardware is also that may and be contemplated.Fig. 3 is this hair
A kind of structural block diagram of the system of the determination straight well shale gas reservoir formation parameter of bright embodiment, as shown in figure 3, determining straight well shale
The system of gas reservoir formation parameter may include: initial setting module 301, simulation calculation module 302, fitting module 303 and determine
Module 304, the modules of 3 pairs of structures are specifically described with reference to the accompanying drawing.
Initial setting module 301, for setting the initial formation parameter of straight well shale gas reservoir；
Simulation calculation module 302 obtains the shaft bottom pressure of shale gas reservoir for carrying out simulation calculating according to initial formation parameter
Power, and according to bottom pressure, it is theoretical to draw bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative
Curve；
Fitting module 303, it is theoretical for bottom pressure theoretical curve and bottom pressure measured curve, bottom pressure to land
Curve and bottom pressure landing measured curve, bottom pressure derivative theoretical curve and bottom pressure derivative measured curve carry out respectively
Fitting, obtains fitting result；
Determining module 304, if fitting result meets default required precision, for initial formation parameter to be determined as page
The actual formation parameter of rock gas reservoir；If fitting result is unsatisfactory for default required precision, for being managed according to bottom pressure derivative
One or many correct operations are carried out to initial formation parameter by the pseudoradial flow and pseudo-linear stream of curve, after based on correction
The obtained fitting result of initial formation parameter meet default required precision, and the initial formation parameter after correction is determined as directly
The actual formation parameter of well shale gas reservoir.
In the specific implementation process, simulation calculation module 302 is specifically used for: obtain shale gas reservoir initial condition parameters and
The wellbore parameters of shale gas reservoir；Then by the initial condition parameters of shale gas reservoir, the wellbore parameters and shale gas reservoir of shale gas reservoir
Parameter sets of the initial formation parameter as shale gas reservoir；Resettle the flow model of shale gas reservoir；Shale gas reservoir is determined again
Pit shaft type, production method and working condition；Then according to parameter sets, flow model, pit shaft type, production method are utilized
Simulation calculating is carried out with working condition, obtains the bottom pressure of shale gas reservoir；The bottom pressure that last basis obtains, drafting obtain
Bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve.
It should be noted that in order to establish the flow model of the shale gas reservoir comprising shale gas adsorption and desorption characteristic,
Above-mentioned simulation calculation module 304 may include: according to apparent permeability public affairs in the process for the flow model for specifically establishing shale gas reservoir
Formula and Darcy's law are modified the initial flow model of shale gas reservoir, by the initial flow model of revised shale gas reservoir
The first correction model as shale gas reservoir；By establishing single-component gas adsorption equation, mould is corrected to the first of shale gas reservoir
Type is adjusted, and obtains the second correction model of shale gas reservoir；According to the principle of mass conservation, mould is corrected to the second of shale gas reservoir
Type is adjusted, using the second correction model of the shale gas reservoir obtained after adjustment as the flow model of shale gas reservoir.Thus can
With according to the flow model of the shale gas reservoir, can obtain in the next steps has with characteristic when shale gas adsorption and desorption
The pseudoradial flow and pseudo-linear stream of pass.
It needs to intend by correct operation if fitting result is unsatisfactory for default required precision in specific implementation process
It closes result and meets default required precision.That is: determining module 304 is according to the pseudoradial flow and quasi- line of bottom pressure derivative theoretical curve
Property stream will do it one or many correct operations to initial formation parameter, until what is obtained based on the initial formation parameter after correction
Fitting result meets default required precision, and the actual formation that the initial formation parameter after correction is determined as shale gas reservoir is joined
Number.Wherein, above-mentioned correct operation is mainly, by correction module 304 according to the pseudo-radial of bottom pressure derivative theoretical curve
Stream and pseudo-linear stream adjust initial formation parameter, the initial formation parameter after being corrected；Further according to the initial stratum after correction
Parameter, is calculated by simulation, the bottom pressure after obtaining the correction of shale gas reservoir, and it is theoretical bent to draw the bottom pressure after correction
Bottom pressure landing theoretical curve after line, correction and the bottom pressure derivative theoretical curve after correction；It finally will be after correction
Bottom pressure landing theoretical curve and bottom pressure landing after bottom pressure theoretical curve and bottom pressure measured curve, correction
Bottom pressure derivative theoretical curve and bottom pressure derivative measured curve after measured curve, correction are fitted respectively, are obtained
The fitting result obtained based on the initial formation parameter after correction.
Wherein it should be noted that pseudoradial flow according to bottom pressure derivative theoretical curve in above-mentioned implementation process and
Pseudo-linear stream adjusts initial formation parameter, and the initial formation parameter after being corrected specifically can be and be respectively compared bottom pressure
Theoretical curve and bottom pressure measured curve, bottom pressure landing theoretical curve and bottom pressure landing measured curve, shaft bottom pressure
Power derivative theoretical curve and bottom pressure derivative survey theoretical curve, obtain comparison result；Using the comparison result, according to shaft bottom
The pseudoradial flow and pseudo-linear stream of pressure derivative theoretical curve adjust initial formation parameter, the initial stratum ginseng after being corrected
Number.
In actual implementation process, initial formation parameter is adjusted by determining module 304, after being corrected initially
Layer parameter, wherein the module generally as the case may be in initial formation parameter stratum absorption parameter, in-place permeability,
Skin factor and porosity, these four types of parameters are adjusted.Lower determining module 304 be following is a brief introduction of to above-mentioned a few class parameters
Specific adjustment process.
In a specific embodiment, in order to quickly and efficiently adjust initial formation parameter, include in initial formation parameter
In the case that parameter is adsorbed on stratum, determining module 304 is according to the comparison result of theoretical curve and measured curve, to formation parameter
Adjustment generally may include: to be higher than the quasi- of bottom pressure measured curve in the position of the pseudoradial flow of bottom pressure theoretical curve
In the case where the position of radial flow, then reduce stratum absorption parameter；It is low in the position of the pseudoradial flow of bottom pressure theoretical curve
In the case where the position of the pseudoradial flow of bottom pressure measured curve, then increase stratum absorption parameter.
In a specific embodiment, in order to quickly and efficiently adjust initial formation parameter, include in initial formation parameter
In the case where in-place permeability, determining module 304 is according to comparison result, and adjustment to in-place permeability generally may include: In
In the case that the length of the pseudoradial flow of bottom pressure theoretical curve is less than the length of the pseudoradial flow of bottom pressure measured curve,
Then reduce in-place permeability；It is greater than the quasi- diameter of bottom pressure measured curve in the length of the pseudoradial flow of bottom pressure theoretical curve
To stream length in the case where, then increase in-place permeability.
In a specific embodiment, in order to quickly and efficiently adjust initial formation parameter, include in initial formation parameter
In the case where skin factor, determining module 304 is according to comparison result, and adjustment to skin factor generally may include: in shaft bottom
The pseudoradial flow of pressure theory curve and the alternate position spike of pseudo-linear stream and bottom pressure measured curve pseudoradial flow and pseudo-linear stream
Alternate position spike difference be greater than preset threshold in the case where, then adjust skin factor.
In a specific embodiment, in order to quickly and efficiently adjust initial formation parameter, include in initial formation parameter
In the case where porosity, determining module 304 is according to comparison result, and adjustment to porosity generally may include: in bottom pressure
The position of the pseudoradial flow of theoretical curve and the alternate position spike of pseudo-linear stream and bottom pressure measured curve pseudoradial flow and pseudo-linear stream
The difference of difference is set less than in the case where preset threshold, then adjusts the porosity.
In the actual implementation process, determining module 304 is in addition to that respectively can join initial stratum by above-mentioned four kinds of modes
Stratum absorption parameter, in-place permeability, skin factor and porosity in number are adjusted, the initial stratum ginseng after being corrected
Number is outer, and determining module 304 can also be arranged and be adjusted to boundary parameter.When it is implemented, determining module 304 can be according to three
The extent of deviation of theoretical curve and three measured curves, correspondingly gradually adjusts boundary parameter so that three theoretical curves by
Gradually close to corresponding three measured curves, until the deviation of three theoretical curves and corresponding measured curve is in tolerance interval
It is interior, determine boundary parameter at this time, and the boundary parameter is included in the initial formation parameter after correction.
It can be seen from the above description that the embodiment of the present invention realizes following technical effect: by being pressed according to shaft bottom
The pseudoradial flow and pseudo-linear stream of power derivative theoretical curve are to the design parameter in the set initial formation parameter of shale gas reservoir
It is pointedly corrected, to determine the actual formation parameter of straight well shale gas reservoir, radial flow is used due to avoiding, to solve
It has determined and has determined that the trouble of determination process existing for shale gas reservoir formation parameter, determination process are time-consuming present in unstable state well-logging method
Long technical problem has achieved the purpose that quick, accurate determining straight well shale gas reservoir formation parameter；In order to avoid using radial direction
Stream needs to obtain pseudoradial flow and pseudo-linear stream, and the embodiment of the present invention joined adsorbed gas in stratigraphic model, and be seeped according to view
Saturating rate formula, Darcy's law and one-component gas absorption formula establish the flow model of shale gas reservoir, so as to obtain simultaneously benefit
With pseudoradial flow and pseudo-linear stream, realize that the short time to shale gas reservoir formation parameter based on pressure identifies；In view of straight well
The characteristic itself having targetedly adjusts and has in the formation parameter of straight well shale gas reservoir according to pseudoradial flow and pseudo-linear stream
Body parameter, i.e. stratum adsorb the parameters such as parameter, in-place permeability, porosity and skin factor, and realization is quick to initial parameter, has
The adjustment and correction of effect, so as to quickly determine actual formation parameter.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step can be with
It is realized with general computing device, they can be concentrated on a single computing device, or be distributed in multiple computing devices
On composed network, optionally, they can be realized with the program code that computing device can perform, it is thus possible to by it
Store and be performed by computing device in the storage device, and in some cases, can be held with the sequence for being different from herein
The shown or described step of row, perhaps they are fabricated to each integrated circuit modules or will be multiple in them
Module or step are fabricated to single integrated circuit module to realize.In this way, the embodiment of the present invention be not limited to it is any specific hard
Part and software combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the embodiment of the present invention can have various modifications and variations.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of method of determining straight well shale gas reservoir formation parameter characterized by comprising
Set the initial formation parameter of straight well shale gas reservoir；
Simulation calculating is carried out according to the initial formation parameter, obtains the bottom pressure of the shale gas reservoir, and according to the well
Bottom pressure draws bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve；
By the bottom pressure theoretical curve and bottom pressure measured curve, bottom pressure landing theoretical curve and shaft bottom pressure
Power landing measured curve, the bottom pressure derivative theoretical curve and bottom pressure derivative measured curve are fitted respectively, are obtained
To fitting result；
If the fitting result meets default required precision, the initial formation parameter is determined as the shale gas reservoir
Actual formation parameter；
If the fitting result is unsatisfactory for default required precision, according to the pseudoradial flow of bottom pressure derivative theoretical curve and
Pseudo-linear stream carries out one or many correct operations to the initial formation parameter, until based on the initial formation parameter after correction
Obtained fitting result meets the default required precision, and the initial formation parameter after correction is determined as the shale gas reservoir
Actual formation parameter；
Wherein, the bottom pressure of the shale gas reservoir is obtained by the flow model of shale gas reservoir；
Wherein, the flow model of the shale gas reservoir is established in the following way:
The initial flow model of the shale gas reservoir is modified according to apparent permeability formula and Darcy's law, it will be revised
First correction model of the initial flow model of shale gas reservoir as the shale gas reservoir；
By establishing single-component gas adsorption equation, the first correction model of the shale gas reservoir is adjusted, is obtained described
Second correction model of shale gas reservoir；
According to the principle of mass conservation, the second correction model of the shale gas reservoir is adjusted, described in being obtained after adjustment
Flow model of second correction model of shale gas reservoir as the shale gas reservoir.
2. being obtained the method according to claim 1, wherein carrying out simulation calculating according to the initial formation parameter
To the bottom pressure of the shale gas reservoir, and according to the bottom pressure, bottom pressure theoretical curve, bottom pressure landing are drawn
Theoretical curve and bottom pressure derivative theoretical curve, comprising:
Obtain the initial condition parameters of the shale gas reservoir and the wellbore parameters of the shale gas reservoir；
Initially by the initial condition parameters of the shale gas reservoir, the wellbore parameters of the shale gas reservoir and the shale gas reservoir
Parameter sets of the layer parameter as the shale gas reservoir；
Establish the flow model of the shale gas reservoir；
Determine pit shaft type, production method and the working condition of the shale gas reservoir；
According to the parameter sets, the flow model, the pit shaft type, the production method and the working condition are utilized
Simulation calculating is carried out, the bottom pressure of the shale gas reservoir is obtained；
According to the bottom pressure, drafting obtain the bottom pressure theoretical curve, bottom pressure landing theoretical curve and
The bottom pressure derivative theoretical curve.
3. the method according to claim 1, wherein the correct operation includes:
The initial formation parameter is adjusted according to the pseudoradial flow of the bottom pressure derivative theoretical curve and pseudo-linear stream, is obtained
Initial formation parameter after correction；
It according to the initial formation parameter after the correction, is calculated by simulation, the shaft bottom after obtaining the correction of the shale gas reservoir
Pressure, and draw the well after the bottom pressure theoretical curve after correction, the landing theoretical curve of the bottom pressure after correction and correction
Bottom pressure derivative theoretical curve；
By the bottom pressure theoretical curve after the correction and the bottom pressure after the bottom pressure measured curve, the correction
Land theoretical curve and bottom pressure landing measured curve, the bottom pressure derivative theoretical curve after the correction and described
Bottom pressure derivative measured curve is fitted respectively, obtains the fitting result obtained based on the initial formation parameter after correction.
4. according to the method described in claim 3, it is characterized in that, according to the pseudo-radial of the bottom pressure derivative theoretical curve
Stream and pseudo-linear stream adjust the initial formation parameter, the initial formation parameter after being corrected, comprising:
It is respectively compared the bottom pressure theoretical curve and the bottom pressure measured curve, the bottom pressure landing is theoretical bent
Line and bottom pressure landing measured curve, the bottom pressure derivative theoretical curve and bottom pressure derivative actual measurement reason
By curve, comparison result is obtained；
According to the pseudoradial flow of the comparison result and the bottom pressure derivative theoretical curve, pseudo-linear stream, adjust described first
Beginning formation parameter, the initial formation parameter after being corrected.
5. according to the method described in claim 4, it is characterized in that, the initial formation parameter includes at least one of: ground
Layer absorption parameter, in-place permeability, skin factor and porosity.
6. according to the method described in claim 5, it is characterized in that, including the stratum absorption ginseng in the initial formation parameter
In the case where number, according to the comparison result, the formation parameter is adjusted, comprising:
It is higher than the bottom pressure derivative measured curve in the position of the pseudoradial flow of the bottom pressure derivative theoretical curve
In the case where the position of pseudoradial flow, reduce the stratum absorption parameter；
It is lower than the bottom pressure derivative measured curve in the position of the pseudoradial flow of the bottom pressure derivative theoretical curve
In the case where the position of pseudoradial flow, increase the stratum absorption parameter.
7. according to the method described in claim 5, it is characterized in that, including the in-place permeability in the initial formation parameter
In the case where, according to the comparison result, adjust the in-place permeability, comprising:
It is less than the bottom pressure derivative measured curve in the length of the pseudoradial flow of the bottom pressure derivative theoretical curve
In the case where the length of pseudoradial flow, then reduce the in-place permeability；
It is greater than the bottom pressure derivative measured curve in the length of the pseudoradial flow of the bottom pressure derivative theoretical curve
In the case where the length of pseudoradial flow, then increase the in-place permeability.
8. according to the method described in claim 5, it is characterized in that, including the skin factor in the initial formation parameter
In the case of, according to the comparison result, adjust the skin factor, comprising:
In the pseudoradial flow of the bottom pressure derivative theoretical curve and the alternate position spike of pseudo-linear stream and the bottom pressure derivative
The difference of the alternate position spike of measured curve pseudoradial flow and pseudo-linear stream be greater than preset threshold in the case where, then adjust the epidermis because
Son.
9. according to the method described in claim 5, it is characterized in that, including the feelings of the porosity in the initial formation parameter
Under condition, according to the comparison result, the porosity is adjusted, including
In the pseudoradial flow of the bottom pressure derivative theoretical curve and the alternate position spike of pseudo-linear stream and the bottom pressure derivative
In the case that the difference of the alternate position spike of measured curve pseudoradial flow and pseudo-linear stream is less than preset threshold, then the hole is adjusted
Degree.
10. a kind of system of determining straight well shale gas reservoir formation parameter characterized by comprising
Initial setting module, for setting the initial formation parameter of straight well shale gas reservoir；
Simulation calculation module obtains the shaft bottom of the shale gas reservoir for carrying out simulation calculating according to the initial formation parameter
Pressure, and according to the bottom pressure, it draws bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure and leads
Number theoretical curve；
Fitting module, for managing the bottom pressure theoretical curve and bottom pressure measured curve, bottom pressure landing
By curve and bottom pressure landing measured curve, the bottom pressure derivative theoretical curve and bottom pressure derivative measured curve point
It is not fitted, obtains fitting result；
Determining module, if the fitting result meets default required precision, for the initial formation parameter to be determined as
The actual formation parameter of the shale gas reservoir；If the fitting result is unsatisfactory for default required precision, for according to shaft bottom
The pseudoradial flow and pseudo-linear stream of pressure derivative theoretical curve carry out one or many correct operations to the initial formation parameter,
Until the fitting result obtained based on the initial formation parameter after correction meets the default required precision, and will after correction just
Beginning formation parameter is determined as the actual formation parameter of the shale gas reservoir；
Wherein, the bottom pressure of the shale gas reservoir is obtained by the flow model of shale gas reservoir；
Wherein, the flow model of the shale gas reservoir is established in the following way:
The initial flow model of the shale gas reservoir is modified according to apparent permeability formula and Darcy's law, it will be revised
First correction model of the initial flow model of shale gas reservoir as the shale gas reservoir；
By establishing single-component gas adsorption equation, the first correction model of the shale gas reservoir is adjusted, is obtained described
Second correction model of shale gas reservoir；
According to the principle of mass conservation, the second correction model of the shale gas reservoir is adjusted, described in being obtained after adjustment
Flow model of second correction model of shale gas reservoir as the shale gas reservoir.
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