CN106326545A - Method and system for determining formation parameters of horizontal well shale gas reservoir - Google Patents
Method and system for determining formation parameters of horizontal well shale gas reservoir Download PDFInfo
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Abstract
The embodiment of the invention provides a method and system for determining formation parameters of a horizontal well shale gas reservoir. The method comprises: setting initial formation parameters; obtaining bottom-hole pressure according to the initial formation parameters through analog computation; drawing theoretical curves of the bottom-hole pressure, pressure drop and pressure derivatives; fitting the theoretical curves with corresponding actually measured curves to obtain fitting results; if the fitting results meet a pre-set precision requirement, determining the initial formation parameters to be actual formation parameters; if the fitting results do not meet the pre-set precision requirement, correcting the initial formation parameters according to the length and position of a quasi-line segment until the fitting results meet the pre-set precision requirement; determining corrected initial formation parameters to be the actual formation parameters. According to the method and the system, provided by the invention, the formation parameters are determined according to the quasi-line segment, so that the technical problem of a non-steady state well testing method that the determination speed is slow is solved, and the aim of rapidly and accurately determining the formation parameters of the horizontal well shale gas reservoir is realized.
Description
Technical field
The present invention relates to Reservoir Development technical field, determine horizontal well shale gas reservoir formation parameter particularly to a kind of
Method and system.
Background technology
In actual Reservoir Development, shale gas reservoir is generally referred to as the gas of geological storage complicated condition, exploitation more difficulty
Hide.During concrete oil-gas exploration, the correlation circumstance of accurate description shale gas reservoir, significant in actual production,
And the geologic parameter of shale gas reservoir is a significant data of the correlation circumstance for describing shale gas reservoir.Wherein, due to level
The characteristic of well itself, the geologic parameter of horizontal well shale gas reservoir generally comprises: stratum absorption parameter is (as gentle in gas absorption pressure
Body adsorbance etc.), in-place permeability, skin factor, fracture half-length, porosity and boundary parameter (as big in boundary types and border
Little etc.) etc..For the correlation circumstance of accurate description horizontal well shale gas reservoir, determine horizontal well shale gas the most accurately and rapidly
The formation parameter problem that always people pay special attention to hidden.
Being presently mainly the formation parameter being determined horizontal well shale gas reservoir by unstable state well-logging method, this unstable state tries
Well method can be generally divided into conventional well testing and Modern test well, but mostly mainly determines horizontal well shale gas by seepage theory
The formation parameter hidden.Wherein, conventional well testing be typically the bottom pressure drawing actual measurement in rectangular coordinate or semilog coordinate with
The straightway of time change, utilizes the slope of this straightway to carry out the formation parameter of reverse shale gas reservoir；And Modern test well is based on
Seepage theory calculates the curve to nondimensional time of the shaft bottom dimensionless pressure under given parameters, is referred to as theoretical plate, then will
Measured curve is fitted with theoretical plate, determines the formation parameter of shale gas reservoir with this.
But, when being embodied as, because unstable state well-logging method determines shale gas reservoir formation parameter by seepage theory, past
Determine cumbersome toward existence, determine slow-footed problem.
For the problems referred to above, effective solution is the most not yet proposed.
Summary of the invention
Embodiments provide a kind of method and system determining horizontal well shale gas reservoir formation parameter, to reach fast
Speed determines the purpose of described horizontal well shale gas reservoir formation parameter.
Embodiments provide a kind of method determining horizontal well shale gas reservoir formation parameter, including:
Set the initially layer parameter of horizontal well shale gas reservoir；
It is simulated calculating according to described initially layer parameter, obtains the bottom pressure of described shale gas reservoir, and according to institute
State bottom pressure, draw bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve；
According to described bottom pressure theoretical curve, described bottom pressure landing theoretical curve, described bottom pressure derivative reason
Opinion curve, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve, by matching,
Obtain fitting result；
If described fitting result meets presets required precision, then described initially layer parameter is defined as described shale gas
The actual formation parameter hidden；
If described fitting result is unsatisfactory for presetting required precision, then according to the plan straightway of theoretical curve to described initially
Formation parameter carries out one or many correct operation, meets until the fitting result obtained based on the initially layer parameter after correction
Described default required precision, and the initially layer parameter after correction is defined as the actual formation parameter of described shale gas reservoir.
In one embodiment, it is simulated calculating according to described initially layer parameter, obtains the well of described shale gas reservoir
Bottom pressure, and according to described bottom pressure, draw bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure
Derivative theoretical curve, including:
Obtain initial condition parameters and the wellbore parameters of described shale gas reservoir of described shale gas reservoir；
At the beginning of the initial condition parameters of described shale gas reservoir, the wellbore parameters of described shale gas reservoir and described shale gas reservoir
Beginning formation parameter is as the parameter sets of described shale gas reservoir；
Set up the flow model of described shale gas reservoir；
Determine pit shaft type, the mode of production and the working condition of described shale gas reservoir；
According to described parameter sets, utilize described flow model, described pit shaft type, the described mode of production and described production
Condition is simulated calculating, and obtains the bottom pressure of described shale gas reservoir；
According to described bottom pressure, draw and obtain described bottom pressure theoretical curve, the theoretical song of described bottom pressure landing
Line and described bottom pressure derivative theoretical curve.
In one embodiment, set up the flow model of described shale gas reservoir, including:
According to apparent permeability formula and Darcy's law, the initial flow model of described shale gas reservoir is modified, will revise
After the initial flow model of shale gas reservoir as the first correction model of described shale gas reservoir；
By setting up single-component gas adsorption equation, the first correction model of described shale gas reservoir is adjusted, obtains
Second correction model of described shale gas reservoir；
According to the principle of mass conservation, the second correction model of described shale gas reservoir is adjusted, obtains after adjusting
Second correction model of described shale gas reservoir is as the flow model of described shale gas reservoir.
In one embodiment, described according to described bottom pressure theoretical curve, described bottom pressure landing theoretical curve,
Described bottom pressure derivative theoretical curve, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative
Measured curve, by matching, obtains fitting result, including:
According to described bottom pressure theoretical curve, described bottom pressure landing theoretical curve and described bottom pressure derivative reason
Opinion curve, obtains theoretical pressure difference and theoretical pressure derivative；
According to the poor and described theoretical pressure derivative of described theoretical pressure, drafting theoretical pressure difference is double with theoretical pressure derivative
Logarithmic chart；
Real according to described bottom pressure measured curve, described bottom pressure landing measured curve and described bottom pressure derivative
Survey curve, obtain observed pressure difference and observed pressure derivative；
According to the poor and described observed pressure derivative of described observed pressure, drafting observed pressure difference is double with observed pressure derivative
Logarithmic chart；
Log-log graph and the described observed pressure difference of described theoretical pressure difference with theoretical pressure derivative are led with observed pressure
The log-log graph of number is fitted, and obtains described fitting result.
In one embodiment, the described plan straightway according to theoretical curve described initially layer parameter is carried out once or
Repeatedly correct operation, including:
Plan straightway according to described theoretical curve adjust described in initially layer parameter, the initial stratum after correct is joined
Number；
According to the initially layer parameter after described correction, calculated by simulation, after obtaining the correction of described shale gas reservoir
Bottom pressure, and draw the bottom pressure theoretical curve after correction, correction after bottom pressure landing theoretical curve and correction after
Bottom pressure derivative theoretical curve；
According to described bottom pressure theoretical curve, described bottom pressure landing theoretical curve, described bottom pressure derivative reason
Opinion curve, described bottom pressure measured curve, described bottom pressure landing measured curve and described bottom pressure derivative actual measurement song
Line, by matching, obtains fitting result.
In one embodiment, according to the plan straightway of described theoretical curve adjust described in initially layer parameter, obtain school
Initially layer parameter after just, including:
It is respectively compared described bottom pressure theoretical curve and described bottom pressure measured curve, described bottom pressure landing reason
Opinion curve and described bottom pressure landing measured curve, described bottom pressure derivative theoretical curve and described bottom pressure derivative are real
Survey theoretical curve, obtain comparative result；
Plan straightway according to described comparative result and described theoretical curve, initially layer parameter described in adjustment, obtain school
Initially layer parameter after just.
In one embodiment, described initially layer parameter includes at least one of: stratum absorption parameter, stratum are permeated
Rate, skin factor, fracture half-length and porosity.
In one embodiment, in the case of described initially layer parameter includes described stratum absorption parameter, according to institute
State comparative result, adjust described formation parameter, including:
Plan length of straigh line at described bottom pressure landing theoretical curve is shorter than described bottom pressure landing measured curve
Plan length of straigh line in the case of, then increase described stratum absorption parameter；
Plan length of straigh line at described bottom pressure landing theoretical curve is more than described bottom pressure landing measured curve
Plan length of straigh line in the case of, then reduce described stratum absorption parameter.
In one embodiment, at least one of is included at described initially layer parameter: described in-place permeability, described
In the case of skin factor and described fracture half-length, according to described comparative result, corresponding adjustment described in-place permeability, described table
The skin factor and described fracture half-length, including:
In the plan straightway position of described bottom pressure landing theoretical curve higher than described bottom pressure landing measured curve
Plan straightway position in the case of, then increase described in-place permeability, described skin factor and described fracture half-length；
In the plan straightway position of described bottom pressure landing theoretical curve less than described bottom pressure landing measured curve
Plan straightway position in the case of, then reduce described in-place permeability, described skin factor and described fracture half-length.
In one embodiment, in the case of described initially layer parameter includes porosity described in described table, according to institute
State comparative result, adjust described porosity, including:
The position intending straightway according to described bottom pressure landing theoretical curve and described bottom pressure landing actual measurement song
Porosity described in the plan straightway position adjustment of line.
Based on identical inventive concept, the embodiment of the present invention additionally provides one and determines horizontal well shale gas reservoir formation parameter
System, including:
Initial setting module, for setting the initially layer parameter of horizontal well shale gas reservoir；
Simulation calculation module, for being simulated calculating according to described initially layer parameter, obtains described shale gas reservoir
Bottom pressure, and according to described bottom pressure, draw bottom pressure theoretical curve, bottom pressure landing theoretical curve and shaft bottom pressure
Power derivative theoretical curve；
Fitting module, for according to described bottom pressure theoretical curve, described bottom pressure landing theoretical curve, described well
Bottom pressure derivative theoretical curve, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative actual measurement song
Line, by matching, obtains fitting result；
Determine module, if described fitting result meets presets required precision, then for by true for described initially layer parameter
It is set to the actual formation parameter of described shale gas reservoir；If described fitting result is unsatisfactory for presetting required precision, then for basis
The plan straightway of theoretical curve carries out one or many correct operation to described initially layer parameter, until based on correction after at the beginning of
The fitting result that beginning formation parameter obtains meets described default required precision, and the initially layer parameter after correction is defined as institute
State the actual formation parameter of shale gas reservoir.
In the embodiment of the present invention, by utilizing the straightway of intending of theoretical curve that the set initial stratum of shale gas reservoir is joined
Number is corrected pointedly, and determines the formation parameter of reality, solves existing method and is determined by unstable state well-logging method
During shale gas reservoir formation parameter exist determination formation parameter cumbersome, determine the technical problem that process is time-consumingly grown,
Reach quickly, accurately to determine the purpose of horizontal well shale gas reservoir formation parameter.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, not
Constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is the method process chart of determination horizontal well shale gas reservoir formation parameter according to embodiments of the present invention；
Fig. 2 be determination horizontal well shale gas reservoir formation parameter according to embodiments of the present invention method in correct operation process
Flow chart；
Fig. 3 is the system structure schematic diagram of determination horizontal well shale gas reservoir formation parameter according to embodiments of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, right
The present invention is described in further details.Here, the exemplary embodiment of the present invention and explanation thereof are used for explaining the present invention, but also
Not as a limitation of the invention.
The formation parameter of the shale gas reservoir of horizontal well is determined, at tool in view of the unstable state well-logging method currently mainly used
When body is implemented, determined that by unstable state well-logging method the process existence of shale gas reservoir formation parameter determines cumbersome, determines speed
Spend slow problem.It practice, when shale gas adsorption and desorption, bottom pressure landing theoretical curve there will be plan straightway,
This plan straightway actually formation parameter with the shale gas reservoir studied has close ties, utilizes this contact, Ke Yitong
Cross plan straightway, determine the formation parameter of shale gas reservoir, and, compared to existing method, intend straightway and be prone to determine, the most really
Determine process the most shorter.Based on above-mentioned situation, in order to solve to determine cumbersome present in prior art, determine that speed is slow
Problem, it is considered to the adsorbed gas on stratum can be added, utilize corresponding properties, it is thus achieved that intend straightway, such that it is able to according to intend straight line
The formation parameter of shale gas reservoir is quickly determined by section.
Based on above-mentioned thinking, and in view of the concrete property of horizontal well, embodiments provide one and determine level
The method of well shale gas reservoir formation parameter, as it is shown in figure 1, may include that
Step 101: set the initially layer parameter of horizontal well shale gas reservoir；
When being embodied as, for horizontal well shale gas reservoir, it is contemplated that the correlation properties of horizontal well, by step 101 basis
It is embodied as situation, in conjunction with relevant surveying and mapping data, respectively to stratum absorption parameter, in-place permeability, skin factor and porosity
Set initial value, the setting of the initially layer parameter of complete paired parallel horizontal wells shale gas reservoir.
Step 102: be simulated calculating according to initially layer parameter, obtain 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 being embodied as, in order to draw above-mentioned bottom pressure theoretical curve, bottom pressure landing theoretical curve and shaft bottom
Pressure derivative theoretical curve, needs to be calculated bottom pressure by simulation, draws above-mentioned theory curve further according to bottom pressure,
And the process being simulated calculating not only need to use the initially layer parameter above set also need to obtain other relevant parameters,
Model and condition.In a detailed description of the invention, bottom pressure theoretical curve, bottom pressure can be drawn according to following steps
Landing theoretical curve and bottom pressure derivative theoretical curve:
S1: obtain initial condition parameters and the wellbore parameters of shale gas reservoir of shale gas reservoir；
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
Number is as the parameter sets of shale gas reservoir；
S3: set up the flow model of shale gas reservoir；
S4: determine pit shaft type, the mode of production and the working condition of shale gas reservoir；
S5: according to parameter sets, utilizes flow model, pit shaft type, the mode of production and working condition to be simulated calculating,
Obtain the bottom pressure of shale gas reservoir；
S6: according to bottom pressure, draws and obtains bottom pressure theoretical curve, bottom pressure landing theoretical curve and shaft bottom pressure
Power derivative theoretical curve.
That is, theoretical curve and bottom pressure derivative so that the bottom pressure theoretical curve obtained, bottom pressure land
Theoretical curve is the properest, during drawing, has also used the pit shaft of the initial condition parameters of shale gas reservoir, shale gas reservoir
Parameter, the initially layer parameter of shale gas reservoir, the flow model of shale gas reservoir, the pit shaft type of shale gas reservoir, the mode of production and
Working condition etc..Because the parameter participating in calculating and drawing is more, so that draw the properest reality of the curve obtained
Formation conditions.
It should be noted that in order to obtain and utilize plan straightway to determine the formation parameter of shale gas reservoir, it is considered to
Add adsorbed gas in the earth formation, in order to the correlation properties having when being used in shale gas adsorption and desorption layer parameter definitely, institute
There is above-mentioned characteristic to need to set up and the flow model of the shale gas reservoir intending straightway can be obtained.Concrete, set up above-mentioned reality
The process of the flow model executing the shale gas reservoir in mode may include that according to apparent permeability formula and Darcy's law shale gas
The initial flow model hidden is modified, and is repaiied as the first of shale gas reservoir by the initial flow model of revised shale gas reservoir
Positive model；By setting up single-component gas adsorption equation, the first correction model of shale gas reservoir is adjusted, obtains shale gas
The second correction model hidden；According to the principle of mass conservation, the second correction model of shale gas reservoir is adjusted, after adjusting
Second correction model of the shale gas reservoir arrived is as the flow model of shale gas reservoir.
The flow model of the shale gas reservoir obtained is set up, owing to considering shale gas adsorption and desorption by above-mentioned steps
Time characteristic, therefore can obtain plan straightway, thus in follow-up process step, it is possible to use by this shale gas reservoir
Flow model obtains bottom pressure theoretical curve, bottom pressure derivative theoretical curve and bottom pressure landing theoretical curve, then root
Solve according to above-mentioned curve and obtain intending straightway.
Darcy's law in above-described embodiment is linear between percolation flow velocity and the hydraulic slope describing saturated soil water
The rule of relation, also known as linear seepage flow law.I.e. seepage discharge Q and upstream and downstream head difference (h2-h1) and be perpendicular to water (flow) direction
Sectional area A is directly proportional, and is inversely proportional to seepage flow length L, it may be assumed that Q=K*A* (h2-h1)/L.In formula, Q is unit time seepage discharge, F
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
Showing, water was inversely proportional to percolation path length by the seepage discharge of porous media within the unit interval, with discharge section area and
Gross head loss is directly proportional.From hydraulics it is known that be equal to the product of flow velocity v and cross-section of river F by the flow Q of a certain section,
I.e. Q=Fv.This law explanation water is just being become with the size of hydraulic gradient and the permeance property of medium by the speed of porous media
Ratio.But, this law is also not properly suited for the flow model of shale gas reservoir of actual treatment, it is therefore desirable to combine apparent permeability
Obtain the first correction model, but owing to above-mentioned first correction model there is also deficiency, so also needing to further be repaiied
Just process, finally obtain the flow model of the shale gas reservoir that the embodiment of the present invention is used.
Step 103: according to bottom pressure theoretical curve, bottom pressure landing theoretical curve, bottom pressure derivative theory song
Line, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve, by matching, obtain
Fitting result；
In order to obtain required fitting result by matching, step 103 specifically may include that
S1: according to bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve, obtain
Take theoretical pressure difference and theoretical pressure derivative；
S2: according to theoretical pressure difference and theoretical pressure derivative, draws theoretical pressure difference and the double-log of theoretical pressure derivative
Figure；
S3: according to bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve, obtain
Treating excess syndrome measuring pressure difference and observed pressure derivative；
S4: according to observed pressure difference and observed pressure derivative, draws observed pressure difference and the double-log of observed pressure derivative
Figure；
S5: double by theoretical pressure difference and the log-log graph of theoretical pressure derivative and observed pressure difference and observed pressure derivative
Logarithmic chart is fitted, and obtains fitting result.
It should be noted that matching in above-mentioned steps be actually theoretical pressure difference and theoretical pressure derivative double
The log-log graph of logarithmic chart and observed pressure difference and observed pressure derivative compares matching, and it is exactly above-mentioned for obtaining comparative result
Fitting result.
After obtaining concrete fitting result by step 103, this fitting result is analyzed, can tentatively understand theoretical mould
Intend the gap between result and measured result, and this gap is with actual the most mostly by the initially layer parameter initially set up
Have what deviation caused between formation parameter.In order to the initially layer parameter initially set up is corrected to close to actual formation parameter,
Can consider, with this fitting result for correction foundation, to adjust initially layer parameter, until fitting result reaches default precision and wants
Ask, concrete analysis and process, can perform in such a way.
Step 104: if fitting result meets presets required precision, then initially layer parameter is defined as shale gas reservoir
Actual formation parameter；
Step 105: if fitting result is unsatisfactory for presetting required precision, then according to the plan straightway of theoretical curve to initially
Formation parameter carries out one or many correct operation, meets until the fitting result obtained based on the initially layer parameter after correction
Preset required precision, and the initially layer parameter after correction is defined as the actual formation parameter of shale gas reservoir.
In a detailed description of the invention, above-mentioned correct operation specifically can be as in figure 2 it is shown, include:
Step 201: adjust initially layer parameter according to the plan straightway of theoretical curve, the initial stratum ginseng after being corrected
Number；
Step 202: according to the initially layer parameter after correction, calculated by simulation, after obtaining the correction of shale gas reservoir
Bottom pressure, and draw the bottom pressure theoretical curve after correction, correction after bottom pressure landing theoretical curve and correction after
Bottom pressure derivative theoretical curve；
Step 203: according to bottom pressure theoretical curve, bottom pressure landing theoretical curve, bottom pressure derivative theory song
Line, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve, by matching, obtain
Fitting result.
After the fitting result that initially layer parameter after obtaining based on correction obtains, then it is default to judge whether this result meets
Required precision, presets required precision if met, then illustrate that the initially layer parameter after being corrected by use is calculated through simulation
The theoretical curve obtained differs smaller with measured curve, and its error is in tolerance interval, thus may determine that in this step
Initially layer parameter after correction is actual formation parameter；If being unsatisfactory for presetting required precision, after illustrating to correct initially
Also have gap between layer parameter and the formation parameter of reality, the correct operation that one or many is similar can be repeated, until
Last fitting result meets presets required precision, the more initially layer parameter after correction the most for the last time is defined as reality
Formation parameter.
In above-described embodiment, when concrete operations, in order to adjust initially layer parameter accurately and efficiently, after being corrected
Initially layer parameter, respectively step 102 can be drawn the bottom pressure theoretical curve that obtain, bottom pressure landing theoretical bent
Line and bottom pressure derivative theoretical curve compare with the homologous thread of actual measurement, with concrete comparative result as foundation, have pin
Property is adjusted the concrete corresponding parameter in initially layer parameter, and detailed description of the invention may is that and is respectively compared bottom pressure reason
Opinion curve and bottom pressure measured curve, compare bottom pressure landing theoretical curve and bottom pressure landing measured curve, compare
Bottom pressure derivative theoretical curve and bottom pressure derivative actual measurement theoretical curve, obtain comparative result；Obtain according to above-mentioned steps
Comparative result, intend the length of straightway and position adjustment initially layer parameter, at the beginning of after being corrected according to theoretical curve
Beginning formation parameter.
Need exist for explanation, for the shale gas reservoir of horizontal well, above-mentioned initially layer parameter typically can include but not
It is limited at least one of: parameter, in-place permeability, skin factor, fracture half-length and porosity are adsorbed in stratum.But, it is worth
It is noted that above-mentioned cited formation parameter is only a kind of schematic description, it is in order to the present invention is better described, in reality
During execution, it is also possible to include the formation parameter of other corresponding horizontal well shale gas reservoir, can enter according to practical situation
Row is chosen, and this is not construed as limiting by the application.
In a specific embodiment, specifically can join for each in above-mentioned initially layer parameter as the case may be
Number (that is, stratum absorption parameter, in-place permeability, skin factor, fracture half-length and porosity) is adjusted correspondingly respectively, from
And obtain the formation parameter of correction, and then make set initially layer parameter progressively close to also by the correction of one or many
It is approximately equal to the formation parameter of reality.It should be noted that for the adjustment of each design parameter in above-mentioned formation parameter, according to
Different situations need to carry out different adjustment, are the most just respectively directed to the absorption of the stratum in initially layer parameter parameter, stratum is oozed
The concrete adjustment mode of rate, skin factor, fracture half-length and porosity is specifically described respectively thoroughly.
1) adjustment stratum absorption parameter:
Length of straigh line of intending at bottom pressure landing theoretical curve is shorter than the plan straight line of bottom pressure landing measured curve
In the case of segment length, then increase described stratum absorption parameter；Big at the plan length of straigh line of bottom pressure landing theoretical curve
In the case of the plan length of straigh line of bottom pressure landing measured curve, then reduce stratum absorption parameter.
In actual implementation process, the bottom pressure that is shorter in length than intending straightway at bottom pressure landing theoretical curve drops
In the case of the length intending straightway of measured curve that falls, mainly intend straightway with above-mentioned bottom pressure landing theoretical curve
The length degree intending straightway being shorter in length than bottom pressure landing measured curve is foundation, can be according to default ratio amplitude
Increasing stratum absorption parameter, the length intending straightway making bottom pressure landing theoretical curve is real close to bottom pressure landing as early as possible
Survey the length intending straightway of curve, thus after being quickly adjusted, parameter is adsorbed on satisfactory stratum.That is, bottom pressure is worked as
The degree of the length intending straightway being shorter in length than bottom pressure landing measured curve intending straightway of landing theoretical curve is very
Time big, then on the basis of initial stratum absorption parameter, increase stratum absorption parameter significantly；When bottom pressure landing theory
When the degree of the length intending straightway being shorter in length than bottom pressure landing measured curve intending straightway of curve is the least, then exist
On the basis of initial stratum absorption parameter, increase stratum absorption parameter by a small margin.It is similar to, theoretical bent in bottom pressure landing
In the case of the length intending straightway of line is longer than the length intending straightway of bottom pressure landing measured curve, specifically adjust
Time, when the length intending straightway of bottom pressure landing theoretical curve is longer than the plan straightway of bottom pressure landing measured curve
When the degree of length is the biggest, then on the basis of initial stratum absorption parameter, stratum absorption parameter is dramatically reduced；Work as shaft bottom
The length intending straightway of drop of pressure theoretical curve is longer than the journey of the length intending straightway of bottom pressure landing measured curve
When spending the least, then on the basis of initial stratum absorption parameter, reduce stratum absorption parameter by a small margin.By above-mentioned concrete reality
Execute the adjustment of mode, thus realize that parameter is adsorbed on the stratum in initially layer parameter and adjust fast and effectively.
It should be noted, however, that the above-mentioned cited adjustment mode that stratum is specifically adsorbed parameter is only that one is shown
Meaning property describes, and is in order to the present invention is better described, during reality performs, it is also possible to include based on above-mentioned embodiment
Other feasible adjustment modes, specifically can choose according to practical situation, this is not construed as limiting by the application.
2) in-place permeability, skin factor and fracture half-length are adjusted
It is higher than the plan straight line of bottom pressure landing measured curve in the straightway position of intending of bottom pressure landing theoretical curve
In the case of fragment position, then increase in-place permeability, skin factor and fracture half-length；Plan at bottom pressure landing theoretical curve
In the case of the plan straightway position less than bottom pressure landing measured curve, the straightway position, then reduce in-place permeability, table
The skin factor and fracture half-length.In actual implementation process, it is similar in above-mentioned embodiment the adjustment side to stratum absorption parameter
Formula, the position intending straightway of the measured curve that lands with the position intending straightway and the bottom pressure of bottom pressure landing theoretical curve
Between putting, concrete difference degree is foundation, carries out in-place permeability, skin factor and fracture half-length respectively according to corresponding amplitude
Adjust.Detailed description of the invention may include that when the position intending straightway of bottom pressure landing theoretical curve is higher than bottom pressure
The position intending straightway of landing measured curve, and when above-mentioned difference degree is bigger, then at initial in-place permeability, skin factor
On the basis of fracture half-length, increase in-place permeability, skin factor and fracture half-length significantly；When bottom pressure landing reason
The position intending straightway of opinion curve is higher than the position intending straightway of bottom pressure landing measured curve, and above-mentioned difference degree
Time less, then on the basis of initial in-place permeability, skin factor and fracture half-length, increase by a small margin in-place permeability,
Skin factor and fracture half-length；Equally, drop less than bottom pressure when the position intending straightway of bottom pressure landing theoretical curve
Fall the position intending straightway of measured curve, and when above-mentioned difference degree is bigger, then initial in-place permeability, skin factor and
On the basis of fracture half-length, in-place permeability, skin factor and fracture half-length are dramatically reduced；When bottom pressure landing theory
The position intending straightway of curve is less than the position intending straightway of bottom pressure landing measured curve, and above-mentioned difference degree is relatively
Hour, then on the basis of initial in-place permeability, skin factor and fracture half-length, reduce in-place permeability, table by a small margin
The skin factor and fracture half-length.By the adjustment of above-mentioned detailed description of the invention, thus realize stratum in initially layer parameter is permeated
Rate, skin factor and fracture half-length adjust fast and effectively.It should be noted, however, that it is above-mentioned cited specifically to stratum
The adjustment mode of permeability, skin factor and fracture half-length is only a kind of schematic description, is in order to the present invention is better described,
During reality performs, it is also possible to include other feasible adjustment modes based on above-mentioned embodiment, specifically can root
Choosing according to practical situation, this is not construed as limiting by the application.
3) adjusting hole porosity
The position intending straightway and the plan of bottom pressure landing measured curve according to bottom pressure landing theoretical curve are straight
Segment positions suitable adjusting hole porosity.Specifically adjusting when, it is contemplated that the plan causing bottom pressure landing theoretical curve is straight
There are differences between difference and the predetermined threshold value of the alternate position spike that the position of line segment and bottom pressure landing measured curve intend straightway
Reason more complicated, need the hole that can incrementally increase or reduce in initially layer parameter according to actual concrete condition
Degree so that the position of straightway is intended with bottom pressure landing measured curve in the position intending straightway of bottom pressure landing theoretical curve
Put poor difference progressively close to predetermined threshold value.Thus by the way, can obtain and determine that porosity at this moment is correction
After formation parameter in porosity.
In actual implementation process, except above by the stratum in initially layer parameter being adsorbed parameter, stratum infiltration
Rate, skin factor, fracture half-length and porosity are adjusted, outside the initially layer parameter after being corrected, it is also possible to other
Parameter is adjusted, such as: boundary parameter etc..When being embodied as, can be according to above-mentioned three theoretical curves and three actual measurement songs
The extent of deviation of line, the most progressively adjusts boundary parameter so that above-mentioned three theoretical curves move closer to three realities of correspondence
Survey curve, until the deviation of above-mentioned three theoretical curves and corresponding measured curve is in tolerance interval, it is then determined that now
Boundary parameter, and above-mentioned boundary parameter is included in the initially layer parameter after correction.
In embodiments of the present invention, by the length intending straightway according to bottom pressure landing theoretical curve and position pair
In set shale gas reservoir initially layer parameter, parameters is corrected pointedly, determines to meet and presets required precision
Initially layer parameter after correction is actual formation parameter, it is to avoid the process of the relatively cumbersome complexity of existing method, thus solves
Determine shale gas reservoir formation parameter cumbersome present in unstable state well-logging method, determine that the technology that process is time-consumingly grown is asked
Topic, has reached quickly, has accurately determined the purpose of horizontal well shale gas reservoir formation parameter.
Based on same inventive concept, the embodiment of the present invention additionally provides one and determines horizontal well shale gas reservoir formation parameter
System, as described in the following examples.Owing to determining that the system of horizontal well shale gas reservoir formation parameter solves the principle of problem
It is similar to determining horizontal well shale gas reservoir formation parameter method, it is thus determined that the enforcement of the system of shale gas reservoir formation parameter is permissible
See the enforcement determining horizontal well shale gas reservoir formation parameter method, repeat no more in place of repetition.Used below, term
" unit " or " module " can realize the software of predetermined function and/or the combination of hardware.Although described by following example
Device preferably realizes with software, but hardware, or the realization of the combination of software and hardware also may and be contemplated.
Fig. 3 is a kind of structured flowchart of the system of the determination horizontal well shale gas reservoir formation parameter of the embodiment of the present invention, as it is shown on figure 3,
Determine that the system of horizontal well shale gas reservoir formation parameter may include that initial setting module 301, simulation calculation module 302, matching
Module 303 and determine module 304,3 is specifically described the modules of this structure below in conjunction with the accompanying drawings.
Initial setting module 301, for setting the initially layer parameter of horizontal well shale gas reservoir；
Simulation calculation module 302, for being simulated calculating according to initially layer parameter, obtains the shaft bottom pressure of shale gas reservoir
Power, and according to bottom pressure, draw bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical
Curve；
Fitting module 303, for falling according to bottom pressure theoretical curve, bottom pressure landing theoretical curve, bottom pressure
Number theoretical curve, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve, intend
Close, obtain fitting result；
Determine module 304, if fitting result meets presets required precision, then for initially page will be defined as by layer parameter
The actual formation parameter of rock gas reservoir；If fitting result is unsatisfactory for presetting required precision, then for according to shaft bottom theoretical curve
Intend straightway and initially layer parameter is carried out one or many correct operation, until obtaining based on the initially layer parameter after correction
Fitting result meet and preset required precision, and the initially layer parameter after correction is defined as the reality of horizontal well shale gas reservoir
Formation parameter.
In specific implementation process, simulation calculation module 302 specifically 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 of shale gas reservoir and shale gas reservoir
Initially layer parameter as the parameter sets of shale gas reservoir；Resettle the flow model of shale gas reservoir；Determine shale gas reservoir again
Pit shaft type, the mode of production and working condition；Then according to parameter sets, utilize flow model, pit shaft type, the mode of production
It is simulated calculating with working condition, obtains the bottom pressure of shale gas reservoir；Finally according to the bottom pressure obtained, and then draw
Obtain bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve.
It should be noted that for the flow model setting up the shale gas reservoir comprising shale gas adsorption and desorption characteristic,
Above-mentioned simulation calculation module 304, in the process of the flow model specifically setting up shale gas reservoir, may include that according to apparent permeability public
The initial flow model of shale gas reservoir is modified by formula and Darcy's law, by the initial flow model of revised shale gas reservoir
The first correction model as shale gas reservoir；The first correction mould by setting up single-component gas adsorption equation, to shale gas reservoir
Type is adjusted, and obtains the second correction model of shale gas reservoir；According to the principle of mass conservation, the second correction mould to shale gas reservoir
Type is adjusted, and the second correction model of the shale gas reservoir obtained after adjusting is as the flow model of shale gas reservoir.Thus, can
With the flow model according to this shale gas reservoir, it is possible to obtain in subsequent step and have with characteristic during shale gas adsorption and desorption
The plan straightway closed.
In specific implementation process, if fitting result is unsatisfactory for presetting required precision, need to make to intend by correct operation
Close result and meet default required precision.That is: determine that module 304 intends the length of straightway and position pair according to shaft bottom theoretical curve
Initially layer parameter carries out one or many correct operation, until the fitting result obtained based on the initially layer parameter after correction
Meet and preset required precision, and the initially layer parameter after correction is defined as the actual formation parameter of shale gas reservoir.Wherein, on
The correct operation stated mainly, by correction module 304 according to the length intending straightway of well theoretical curve and position adjustment at the beginning of
Beginning formation parameter, the initially layer parameter after being corrected；Further according to the initially layer parameter after correction, calculated by simulation,
Obtain the bottom pressure after the correction of shale gas reservoir, and draw the shaft bottom pressure after the bottom pressure theoretical curve after correction, correction
Bottom pressure derivative theoretical curve after power landing theoretical curve and correction；Finally will correction after bottom pressure theoretical curve and
Bottom pressure after bottom pressure measured curve, correction lands after theoretical curve and bottom pressure landing measured curve, correction
Bottom pressure derivative theoretical curve and bottom pressure derivative measured curve are fitted comparing respectively, obtain based on correction after at the beginning of
The fitting result that beginning formation parameter obtains.
Wherein it should be noted that the length intending straightway according to shaft bottom theoretical curve in above-mentioned implementation process and position
Putting and adjust initially layer parameter, the initially layer parameter after being corrected, can be specifically to be respectively compared bottom pressure theory song
Line and bottom pressure measured curve, bottom pressure landing theoretical curve and bottom pressure landing measured curve, bottom pressure derivative
Theoretical curve and bottom pressure derivative actual measurement theoretical curve, obtain comparative result；Utilize this comparative result, bent according to shaft bottom theory
Line intend the length of straightway and position, adjust the design parameter in initially layer parameter pointedly, at the beginning of after being corrected
Beginning formation parameter.
In actual implementation process, it is determined by module 304 and adjusts initially layer parameter, after being corrected initially
Layer parameter, wherein this module be typically based on concrete condition in initially layer parameter stratum adsorb parameter, in-place permeability,
This 5 class parameter of skin factor, fracture half-length and porosity is adjusted.Determine under following is a brief introduction of that module 304 is to above-mentioned several
The process that specifically adjusts of class parameter.
In a specific embodiment, in order to adjust initially layer parameter quickly and efficiently, include at initially layer parameter
In the case of stratum absorption parameter, determine the module 304 comparative result according to theoretical curve Yu measured curve, to formation parameter
Adjust, typically may include that the plan length of straigh line at bottom pressure landing theoretical curve is shorter than bottom pressure landing actual measurement song
In the case of the plan length of straigh line of line, then reduce described stratum absorption parameter；Straight in the plan of bottom pressure landing theoretical curve
In the case of the line segment length plan length of straigh line more than bottom pressure landing measured curve, then increase stratum absorption parameter.
In a specific embodiment, in order to adjust initially layer parameter quickly and efficiently, include at initially layer parameter
In the case of in-place permeability, skin factor and fracture half-length, determine module 304 according to comparative result, to in-place permeability, table
The skin factor and the adjustment of fracture half-length, typically may include that and be higher than in the plan straightway position of bottom pressure landing theoretical curve
In the case of the plan straightway position of bottom pressure landing measured curve, then increase in-place permeability, skin factor and crack half
Long；It is less than the plan straightway position of bottom pressure landing measured curve in the straightway position of intending of bottom pressure landing theoretical curve
In the case of, then reduce in-place permeability, skin factor and fracture half-length.
In a specific embodiment, in order to adjust initially layer parameter quickly and efficiently, include at initially layer parameter
In the case of porosity, determine that module 304, according to comparative result, the adjustment to porosity, typically may include that and presses according to shaft bottom
The position intending straightway of power landing theoretical curve and the plan straightway location-appropriate adjusting hole of bottom pressure landing measured curve
Porosity.
In actual implementation process, determine that module 304 is except can be the most respectively in initially layer parameter
Stratum absorption parameter, in-place permeability, skin factor, fracture half-length and porosity be adjusted, initial after being corrected
Outside formation parameter, it is also possible to arrange and determine that boundary parameter is adjusted by module 304.When being embodied as, determine that module 304 is permissible
According to three theoretical curves and the extent of deviation of three measured curves, the most progressively adjust boundary parameter so that three theories
Curve moves closer to three measured curves of correspondence, until three theoretical curves can accept with the deviation of corresponding measured curve
In the range of, determine boundary parameter now, and this boundary parameter is included in the initially layer parameter after correction.
As can be seen from the above description, the embodiment of the present invention achieves following technique effect: by according to theoretical bent
Design parameter in set shale gas reservoir initially layer parameter is entered by the length intending straightway of line and position pointedly
Row correction, the formation parameter actual to determine horizontal well shale gas reservoir, solve present in employing unstable state well-logging method really
Determine the determination cumbersome of shale gas reservoir formation parameter existence, determine the technical problem that process is time-consumingly grown, reached quickly, accurately
Determine the purpose of horizontal well shale gas reservoir formation parameter；In order to obtain plan straightway, the embodiment of the present invention is at original stratigraphic model
In add adsorbed gas, set up shale gas according to apparent permeability formula, Darcy's law and one-component gas absorption formula the most again
The flow model hidden such that it is able to obtain and utilize the correlation properties intending straightway, it is achieved based on pressure to shale gas reservoir ground
The short time of layer parameter identifies；The characteristic having in view of horizontal well self, according to length and position, the specific aim of intending straightway
Ground adjust horizontal well shale gas reservoir formation parameter in design parameter, i.e. stratum absorption parameter, in-place permeability, skin factor,
Fracture half-length and porosity, it is achieved each design parameter in initially layer parameter is adjusted fast and effectively and corrects, thus can
To quickly determine the formation parameter of reality.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step are permissible
Realizing with general calculating device, they can concentrate on single calculating device, or is distributed in multiple calculating device
On the network formed, alternatively, they can realize with calculating the executable program code of device, it is thus possible to by it
Store and perform by calculating device in the storage device, and in some cases, can hold with the order being different from herein
Step shown or described by row, or they are fabricated to respectively each integrated circuit modules, or multiple by them
Module or step are fabricated to single integrated circuit module and realize.So, the embodiment of the present invention is not restricted to any specific hard
Part and software combine.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the embodiment of the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made
Any modification, equivalent substitution and improvement etc., should be included within the scope of the present invention.
Claims (11)
1. the method determining horizontal well shale gas reservoir formation parameter, it is characterised in that including:
Set the initially layer parameter of horizontal well shale gas reservoir；
It is simulated calculating according to described initially layer parameter, obtains the bottom pressure of described shale gas reservoir, and according to described well
Bottom pressure, draws bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure derivative theoretical curve；
According to described bottom pressure theoretical curve, described bottom pressure landing theoretical curve, described bottom pressure derivative theory song
Line, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve, by matching, obtain
Fitting result；
If described fitting result meets presets required precision, then described initially layer parameter is defined as described shale gas reservoir
Actual formation parameter；
If described fitting result is unsatisfactory for presetting required precision, then according to the plan straightway of theoretical curve to described initial stratum
Parameter carries out one or many correct operation, meets described until the fitting result obtained based on the initially layer parameter after correction
Preset required precision, and the initially layer parameter after correction is defined as the actual formation parameter of described shale gas reservoir.
Method the most according to claim 1, it is characterised in that be simulated calculating according to described initially layer parameter,
To the bottom pressure of described shale gas reservoir, and according to described bottom pressure, draw bottom pressure theoretical curve, bottom pressure landing
Theoretical curve and bottom pressure derivative theoretical curve, including:
Obtain initial condition parameters and the wellbore parameters of described shale gas reservoir of described shale gas reservoir；
By the initial condition parameters of described shale gas reservoir, the wellbore parameters of described shale gas reservoir and described shale gas reservoir initially
Layer parameter is as the parameter sets of described shale gas reservoir；
Set up the flow model of described shale gas reservoir；
Determine pit shaft type, the mode of production and the working condition of described shale gas reservoir；
According to described parameter sets, utilize described flow model, described pit shaft type, the described mode of production and described working condition
It is simulated calculating, obtains the bottom pressure of described shale gas reservoir；
According to described bottom pressure, draw obtain described bottom pressure theoretical curve, described bottom pressure landing theoretical curve and
Described bottom pressure derivative theoretical curve.
Method the most according to claim 2, it is characterised in that set up the flow model of described shale gas reservoir, including:
The initial flow model of described shale gas reservoir is modified, by revised according to apparent permeability formula and Darcy's law
The initial flow model of shale gas reservoir is as the first correction model of described shale gas reservoir；
By setting up single-component gas adsorption equation, the first correction model of described shale gas reservoir is adjusted, obtains described
Second correction model of shale gas reservoir；
According to the principle of mass conservation, the second correction model of described shale gas reservoir is adjusted, will adjust after obtain described in
Second correction model of shale gas reservoir is as the flow model of described shale gas reservoir.
Method the most according to claim 1, it is characterised in that described according to described bottom pressure theoretical curve, described well
Bottom pressure landing theoretical curve, described bottom pressure derivative theoretical curve, bottom pressure measured curve, bottom pressure landing actual measurement
Curve and bottom pressure derivative measured curve, by matching, obtain fitting result, including:
Bent according to described bottom pressure theoretical curve, described bottom pressure landing theoretical curve and described bottom pressure derivative theory
Line, obtains theoretical pressure difference and theoretical pressure derivative；
According to the poor and described theoretical pressure derivative of described theoretical pressure, draw theoretical pressure difference and the double-log of theoretical pressure derivative
Figure；
According to described bottom pressure measured curve, described bottom pressure landing measured curve and described bottom pressure derivative actual measurement song
Line, obtains observed pressure difference and observed pressure derivative；
According to the poor and described observed pressure derivative of described observed pressure, draw observed pressure difference and the double-log of observed pressure derivative
Figure；
By poor with the log-log graph of theoretical pressure derivative and described observed pressure for described theoretical pressure difference and observed pressure derivative
Log-log graph is fitted, and obtains described fitting result.
Method the most according to claim 1, it is characterised in that the described plan straightway according to theoretical curve to described initially
Formation parameter carries out one or many correct operation, including:
Plan straightway according to described theoretical curve adjust described in initially layer parameter, the initially layer parameter after being corrected；
According to the initially layer parameter after described correction, calculated by simulation, obtain the shaft bottom after the correction of described shale gas reservoir
Pressure, and draw the bottom pressure landing theoretical curve after the bottom pressure theoretical curve after correction, correction and the well after correction
Bottom pressure derivative theoretical curve；
According to described bottom pressure theoretical curve, described bottom pressure landing theoretical curve, described bottom pressure derivative theory song
Line, described bottom pressure measured curve, described bottom pressure landing measured curve and described bottom pressure derivative measured curve are logical
Over-fitting, obtains fitting result.
Method the most according to claim 5, it is characterised in that according to the plan straightway of described theoretical curve adjust described at the beginning of
Beginning formation parameter, the initially layer parameter after being corrected, including:
Being respectively compared described bottom pressure theoretical curve and described bottom pressure measured curve, the landing of described bottom pressure is theoretical bent
Line and described bottom pressure landing measured curve, described bottom pressure derivative theoretical curve and described bottom pressure derivative actual measurement reason
Opinion curve, obtains comparative result；
Plan straightway according to described comparative result and described theoretical curve, initially layer parameter described in adjustment, after being corrected
Initially layer parameter.
Method the most according to claim 6, it is characterised in that described initially layer parameter includes at least one of: ground
Layer absorption parameter, in-place permeability, skin factor, fracture half-length and porosity.
Method the most according to claim 7, it is characterised in that include described stratum absorption ginseng at described initially layer parameter
In the case of number, according to described comparative result, adjust described formation parameter, including:
Length of straigh line of intending at described bottom pressure landing theoretical curve is shorter than the plan of described bottom pressure landing measured curve
In the case of length of straigh line, then increase described stratum absorption parameter；
Length of straigh line of intending at described bottom pressure landing theoretical curve is longer than the plan of described bottom pressure landing measured curve
In the case of length of straigh line, then reduce described stratum absorption parameter.
Method the most according to claim 7, it is characterised in that include at least one of at described initially layer parameter:
In the case of described in-place permeability, described skin factor and described fracture half-length, according to described comparative result, corresponding adjustment institute
State in-place permeability, described skin factor and described fracture half-length, including:
It is higher than the plan of described bottom pressure landing measured curve in the straightway position of intending of described bottom pressure landing theoretical curve
In the case of straightway position, then increase described in-place permeability, described skin factor and described fracture half-length；
It is less than the plan of described bottom pressure landing measured curve in the straightway position of intending of described bottom pressure landing theoretical curve
In the case of straightway position, then reduce described in-place permeability, described skin factor and described fracture half-length.
10. the method stated according to claim 7, it is characterised in that include hole described in described table at described initially layer parameter
In the case of degree, according to described comparative result, adjust described porosity, including:
The position of straightway and described bottom pressure landing measured curve is intended according to described bottom pressure landing theoretical curve
Intend porosity described in the position adjustment of straightway.
11. 1 kinds of systems determining horizontal well shale gas reservoir formation parameter, it is characterised in that including:
Initial setting module, for setting the initially layer parameter of horizontal well shale gas reservoir；
Simulation calculation module, for being simulated calculating according to described initially layer parameter, obtains the shaft bottom of described shale gas reservoir
Pressure, and according to described bottom pressure, draw bottom pressure theoretical curve, bottom pressure landing theoretical curve and bottom pressure and lead
Number theoretical curve；
Fitting module, for according to described bottom pressure theoretical curve, described bottom pressure landing theoretical curve, described shaft bottom pressure
Power derivative theoretical curve, bottom pressure measured curve, bottom pressure landing measured curve and bottom pressure derivative measured curve are logical
Over-fitting, obtains fitting result；
Determine module, if described fitting result meets presets required precision, then for being defined as by described initially layer parameter
The actual formation parameter of described shale gas reservoir；If described fitting result is unsatisfactory for presetting required precision, then for according to theory
The plan straightway of curve carries out one or many correct operation to described initially layer parameter, until based on correction after initially
The fitting result that layer parameter obtains meets described default required precision, and the initially layer parameter after correction is defined as described page
The actual formation parameter of rock gas reservoir.
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