CN107478507A - A kind of crisp intermediate zone of prolonging of mud shale determines method - Google Patents
A kind of crisp intermediate zone of prolonging of mud shale determines method Download PDFInfo
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- CN107478507A CN107478507A CN201610403777.1A CN201610403777A CN107478507A CN 107478507 A CN107478507 A CN 107478507A CN 201610403777 A CN201610403777 A CN 201610403777A CN 107478507 A CN107478507 A CN 107478507A
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Abstract
The invention discloses a kind of crisp intermediate zone of prolonging of mud shale to determine method, including：Fragility band bottom circle determines step, and fragility band bottom circle is determined using mud shale overconsolidation ratio threshold value and maximum ancient buried depth；Ductility band top circle determines step, and ductility band top circle is determined using the crisp critical confined pressure of conversion of prolonging；Crisp intermediate zone of prolonging determines step, determines crisp to prolong intermediate zone using fragility band bottom circle and ductility band top circle.Present invention may determine that the crisp depth intervals for prolonging intermediate zone, effectively instruct marine strata in southern China system shale gas exploration and development evaluation study, technical method support is provided for shale gas geology dessert and selecting for engineering dessert.
Description
Technical field
The invention belongs to oil-gas exploration and development technical field, specifically, more particularly to a kind of mud shale it is crisp-prolong intermediate zone
Determine method.
Background technology
With the immense success that North America shale gas exploration and development obtains, shale gas receives much attention in energy field.Either
In shale gas exploration or development phase, crisp/ductility of mud shale is all important parameter, because the storage and collection performance of mud shale,
Drillability, compressibility, the evaluation of the preservation condition and Exploration Potential of permeability and shale gas etc. are all relevant with crisp/ductility.China
It is buried that the high evolution mud shale in south experienced early stage, after late period lifting, confined pressure suffered by mud shale with basin sedimentation and lift
Rise and degrade and dynamic evolution.The Lower Paleozoic strata height evolution mud shale buried now in underground certain depth is fragility or ductility
Its crisp/ductility how is determined, is one of key issue faced in current formation of marine facies in southern China shale gas exploration.
In shale gas exploration and development evaluation, mud is usually evaluated using brittle mineral content, modulus of elasticity and Poisson's ratio
The brittle size of shale.Think that brittle mineral content is higher, then fragility is bigger.Modulus of elasticity is bigger, Poisson's ratio is smaller, then fragility
It is bigger.
Obvious deficiency be present using above parameter to evaluate the fragility of mud shale.Because the fragility of mud shale is except by fragility
Outside the factor of mineral content etc. itself influences, also influenceed (such as confined pressure) by external environment condition.With the increase of confined pressure,
The peak strength and residual strength of mud shale increase, and when confined pressure reaches to a certain degree, residual strength is close to peak strength, mud
Shale occur it is crisp-prolong conversion.How to determine that crisp-ductility of mud shale and depth profile scope turn into discussion mud shale fragility size
The key of this problem.
The content of the invention
To solve problem above, the invention provides a kind of mud shale it is crisp-prolong intermediate zone and determine method, to determine mud page
Crisp-the ductility and depth profile scope of rock.
According to one embodiment of present invention, there is provided a kind of mud shale is crisp-and prolong intermediate zone and determine method, including：
Fragility band bottom circle determines step, and fragility band bottom is determined using mud shale overconsolidation ratio threshold value and maximum ancient buried depth
Boundary；
Ductility band top circle determines step, using it is crisp-prolong the critical confined pressure of conversion and determine ductility band top circle；
It is crisp-to prolong intermediate zone and determine step, using fragility band bottom circle and ductility band top circle determine it is crisp-prolong intermediate zone.
According to one embodiment of present invention, fragility band bottom circle determines that step further comprises：
Nominal consolidation pressure is determined using uniaxial strain test；
The mud shale overconsolidation ratio under different confined pressures is calculated according to nominal consolidation pressure and triaxial compression test；
It is fitted by data and determines mud shale overconsolidation ratio threshold value；
Fragility band bottom circle is determined according to mud shale overconsolidation ratio threshold value.
According to one embodiment of present invention, the nominal consolidation pressure obtains in the following manner：
Pass through uniaxial strain test test sample data；
Axial stress-lateral stress cross plot is drawn according to Example Test Data；
The axial stress corresponding to the point that cross plot upper curve slope is transferred is chosen as nominal consolidation pressure.
According to one embodiment of present invention, the mud page under different confined pressures is calculated according to nominal consolidation pressure and triaxial test
Rock overconsolidation ratio.
According to one embodiment of present invention, it is fitted by data and determines that mud shale overconsolidation ratio threshold value is further wrapped
Include：
Mud shale overconsolidation ratio and normalization shear strength relation are established using stress history and normalization soil body engineering method
Formula：
Wherein, qu/σ3To normalize shear strength, quFor corresponding deviator stress, σ in triaxial test3For in triaxial test
Corresponding confined pressure, OCR be mud shale overconsolidation ratio, empirical coefficient a1It is strong equivalent to the normalization shearing of normal consolidation mud shale
Degree, b1For fitting parameter；
WillWhen OCR values, as mud shale overconsolidation ratio threshold value.
According to one embodiment of present invention, determine that fragility band bottom circle is further wrapped according to mud shale overconsolidation ratio threshold value
Include：
Fragility band bottom circle calculating formula is determined according to mud shale overconsolidation ratio threshold value and the definition of mud shale overconsolidation ratio：
Wherein, HbFor fragility band bottom circle depth, HmaxFor maximum ancient buried depth, OCRLFor mud shale overconsolidation ratio threshold value.
According to one embodiment of present invention, ductility band top circle determines that step further comprises：
Using triaxial compression test data acquisition mud shale it is crisp-prolong the critical confined pressure of conversion；
Using mud shale it is crisp-prolong conversion critical confined pressure conversion for depth and as the top circle depth of ductility band.
According to one embodiment of present invention, using triaxial compression test data acquisition mud shale it is crisp-prolong conversion and critical enclose
Pressure further comprises：
Using triaxial compression test data, mud shale residual strength/peak strength is calculated；
Work out the cross plot of confined pressure and residual strength/peak strength；
Cross plot described in linear fit obtains the number between the confined pressure of different type mud shale and residual strength/peak strength
Model is learned, residual strength/confined pressure when peak strength is 1 is that mud shale is crisp-prolongs the critical confined pressure of conversion.
According to one embodiment of present invention, using mud shale it is crisp-prolong conversion critical confined pressure conversion for depth and as ductility
The top circle depth of band further comprises：
If confined pressure and residual strength/peak strength are in following relation：
Y=a2x-b2
Wherein, y is confined pressure, and x is residual strength/peak strength, a2、b2For fitting coefficient；
Ductility band top circle is converted according to confined pressure value during x=1：
Hd=100 × (a2-b2)/(ρ-1.07)
Wherein, HdFor ductility band top circle, ρ is superstratum density.
According to one embodiment of present invention, it is crisp-to prolong intermediate zone and determine that step further comprises：The ductility band top bound pair
Answer depth and the fragility band bottom bound pair answer depth intervals within the scope of the difference of depth for it is crisp-prolong intermediate zone.
Beneficial effects of the present invention：
The present invention determines the bottom of fragility band using mud shale overconsolidation ratio (OCR) threshold value and maximum perpendicular effective pressure
Boundary, using it is crisp-prolong the top circle that converts critical confined pressure and determine ductility band, so that it is determined that crisp-prolong the depth intervals of intermediate zone, Ke Yiyou
Effect instructs marine strata in southern China system shale gas exploration and development evaluation study, for selecting for shale gas geology dessert and engineering dessert
Technical method support is provided.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by specification, rights
Specifically noted structure is realized and obtained in claim and accompanying drawing.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, required in being described below to embodiment
Accompanying drawing does simple introduction：
Fig. 1 is method flow diagram according to an embodiment of the invention；
Fig. 2 is algorithm flow chart according to an embodiment of the invention；
Fig. 3 is axial stress according to an embodiment of the invention-lateral stress graph of a relation schematic diagram；
Fig. 4 is mud shale OCR according to an embodiment of the invention and normalization maximum principal stress difference cross plot；
Fig. 5 is mud shale residual strength/peak strength according to an embodiment of the invention with confined pressure variation relation figure.
Embodiment
Embodiments of the present invention are described in detail below with reference to drawings and Examples, and how the present invention is applied whereby
Technological means solves technical problem, and the implementation process for reaching technique effect can fully understand and implement according to this.Need to illustrate
As long as not forming conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other,
The technical scheme formed is within protection scope of the present invention.
It is the method flow diagram according to one embodiment of the present of invention as shown in Figure 1, Fig. 2 show corresponding algorithm flow
Figure, below with reference to Fig. 1 and Fig. 2, the present invention is described in detail.
It is that step S10 fragility band bottoms circle determines step first, utilizes mud shale overconsolidation ratio threshold value and maximum ancient buried depth
Determine fragility band bottom circle.The detailed process on fragility band bottom circle is determined using mud shale overconsolidation ratio (OCR) and maximum ancient buried depth such as
Under.
It is step 101 first, nominal consolidation pressure (Pc) is determined using uniaxial strain test.Before nominal consolidation pressure is also known as
Phase consolidation pressure, refer to maximum effective consolidation pressure that mud shale lives through in history, with symbol pcRepresent.Name consolidation pressure
Power (pc) uniaxial strain test method can be used to obtain.Specifically, uniaxial strain test test data, drafting axial stress-laterally should
Power cross plot, the axial stress corresponding to point that cross plot upper curve slope is transferred is exactly nominal consolidation pressure.
Followed by step S102, the mud shale under different confined pressures is calculated according to nominal consolidation pressure and triaxial compression test and surpassed
Consolidation ratio.Overconsolidation ratio (OCR) is the maximum perpendicular effective pressure (σ ' that mud shale is subjected in earth history periodvmax) and it is existing
Modern vertical effective pressure (σ 'vThe ratio between).After later structural lifting is undergone, the shallower mud shale of buried depth is in earth history now
Period lives through higher consolidation pressure (nominal consolidation pressure), therefore, referred to as overconsolidation mud shale (OC mud shales).It is maximum
Vertical effective pressure σ 'vmaxEquivalent to nominal consolidation pressure, i.e.,：
OCR=σ 'vmax/σ'v=Pc/σ'v (1)
It was found from defined above, overconsolidation mud shale OCR determination, it is important to which the determination of nominal consolidation pressure is (by the above
Described uniaxial strain test obtains), vertical effective pressure now can calculate acquisition by buried depth now.
Overconsolidation ratio (OCR) can reflect the degree of brittleness of mud stone.OCR is bigger, and fragility is also bigger.The mud page of normal consolidation
Rock (NC mud shales) OCR is equal to 1, and overconsolidation mud shale OCR values are more than 1.As can be seen from Table 1, confined pressure is smaller, and OCR is bigger, phase
When more shallow in burying, uplift erosion is bigger, and the OCR of mud shale is bigger, and fragility is stronger, when mud shale to become to fragility completely
OCR values are referred to as mud shale OCR threshold values.
The Western Hubei-eastern Silurian mud shale triaxial compression test data of table 1 and OCR computational charts
OCR can not only reflect the fragility of mud shale, and can reflect the shearing strength of mud shale.Using stress history and return
One change soil body engineering method is analyzed the results of triaxial compressive test of mud shale, can establish OCR and normalization shearing is strong
Spend (qu/σ3) relation：
In formula, quFor corresponding deviator stress, σ in triaxial test3For corresponding confined pressure in triaxial test, OCR is mud shale
Overconsolidation ratio, empirical coefficient a1Equivalent to the normalization shear strength of normal consolidation mud shale (OCR=1), b1Join for fitting
Number.It can be seen that OCR is bigger, the normalization shear strength of mud shale is also bigger.
It is finally step S103, determines OCR threshold values.If OCR associated with BRI, have：
Work as BRI>When 2, mud shale becomes fragility completely, and BRI is bigger, and fragility is bigger.Therefore, can incite somebody to actionWhen
OCR values, the fragility threshold value (OCR as mud shaleL), wherein b1For empirical coefficient, by normalization shear strength and OCR data
Fitting obtains.
After OCR threshold values are obtained, by OCR definition (maximum perpendicular effective pressure and vertical effective pressure now it
Than), it can further calculate the bottom circle depth of fragility band.From OCR definition：
Wherein, σ 'vmaxFor maximum perpendicular effective pressure, MPa；σ'vFor vertical effective pressure now, MPa；ρ1, maximum buried depth
When superstratum averag density, g/cm3；ρ2For superstratum averag density now, g/cm3；HmaxFor maximum ancient buried depth, m；
HpresentFor buried depth now, m；1.07 be stratum water density.
Buried depth when OCR reaches threshold value, as fragility band bottom circle depth (Hb)：
Wherein, OCRLFor mud shale overconsolidation ratio threshold value.
Determine step followed by step S20 ductility band tops circle, using it is crisp-prolong the critical confined pressure of conversion and determine ductility band top
Boundary.
The fragility of mud shale and ductility are not itself intrinsic characteristics, by factors such as temperature, strain rate and confined pressures
Influence.With the change of environmental condition, the two can mutually be converted crisp/ductility of mud shale, i.e., it is so-called it is crisp-prolong conversion.
In sedimentary basin petroleum exploration domain, temperature on rock it is crisp-prolong conversion influence very little.Natural strain rate is difficult to determine,
It is but unanimous on the whole in certain area.Confined pressure be influence mud shale it is crisp/key factor of ductility.In fact, rock it is crisp-prolong turn
Change generally also refer under low temperature it is crisp-prolong conversion.Confined pressure control it is lower it is crisp-prolong conversion, be not to be mutated from fragility to ductility, and
It is gradual transition, exists between complete fragility and complete ductility and prolong fragility and crisp ductility intermediate zone.It is generally that stress-strain is bent
Confined pressure value during ideal plasticity is shown as behind line peak, it is referred to as crisp-to prolong conversion critical confined pressure.
In this step, first with triaxial compression test data, the ratio between residual strength and peak strength are calculated, establishment is enclosed
The cross plot of pressure and the ratio between residual strength and peak strength, linear fit obtain different type mud shale confined pressure and remnants it is strong
Mathematical modeling between degree/peak strength, when residual strength/peak strength be 1 when confined pressure, as mud shale it is crisp-prolong conversion
Critical confined pressure, by it is crisp-prolong the top circle depth (H of depth, as ductility band that the critical confined pressure of conversion is convertedd)。
Residual strength/peak strength of mud shale increases with the increase of confined pressure, and the two is in good linear relationship：It can use
Formula y=a2x-b2.So, as x=1, y=a2-b2, it is as crisp-to prolong the critical confined pressure of conversion.When superstratum density p
When knowing, you can be converted into it is crisp-prolong conversion critical depth, i.e. ductility band top circle depth (Hd)：
Hd=100 × (a2-b2)/(ρ-1.07) (6)
Finally step 30, it is crisp-to prolong intermediate zone and determine step, using fragility band bottom circle and ductility band top circle determine it is crisp-prolong
Intermediate zone.Part between ductility band top circle and fragility band bottom circle, i.e. ductility band top bound pair answer depth should with fragility band bottom bound pair
Depth intervals within the scope of the difference of depth for it is crisp-prolong intermediate zone.
The present invention determines the bottom circle of fragility band using mud shale overconsolidation ratio (OCR) threshold value and maximum ancient buried depth, utilizes
It is crisp-to prolong and convert the top circle that critical confined pressure determines ductility band, so that it is determined that crisp-prolong the depth intervals of intermediate zone, can effectively it instruct
Marine strata in southern China system shale gas exploration and development evaluation study, offer skill is selected for shale gas geology dessert and engineering dessert
Art method supports.
Below by taking the Silurian Longma small stream group mud shale of Western Hubei-eastern area as an example, to test method of the present invention
Card.Western Hubei-eastern area Silurian Longma small stream group mud shale sample is gathered, according to《Material passive confined pressure under quasi-one-dimensional strain
SHPB test methods》Uniaxial strain test is carried out, obtains axial stress-lateral stress relation (Fig. 3).Uniaxial strain test curve
The axial stress corresponding to point that slope is transferred is exactly nominal consolidation pressure.It can be read by Fig. 3, the name of the sample is consolidated
Knot pressure power is 155MPa.
Vertical effective pressure now is considered as with the confined pressure given in conventional triaxial compression test, can be to obtain different confined pressures
Under OCR.Test specimen is similarly Western Hubei-eastern area Silurian Longma small stream group mud shale, result of the test and OCR result of calculations
It is shown in Table 1.In table 1, axial stress when peak stress is triaxial compression test mud shale sample broke, confined pressure is i.e. with axially should
The stress of power vertical direction, deviator stress are the difference of peak stress and confined pressure.It is deviator stress and confined pressure to normalize deviator stress
The ratio between.By the ratio between nominal consolidation pressure and confined pressure, that is, obtain the OCR values under the confined pressure.
Cross plot is drawn by the normalization deviator stress in table 1 and OCR data, as shown in figure 4, being fitted by data, obtained
It is to the functional relation between normalization maximum principal stress difference and OCR：Y=2.4723x0.7285, R2=0.9927, fitting degree
It is very high.It can be seen that empirical coefficient b1=0.73, then byThe threshold value for obtaining OCR is 2.6.I.e. when Silurian Longma small stream
When the OCR of group reaches 2.6, fragility will be changed into.
It is 2.6 by Silurian Longma small stream group mud shale OCR threshold values exemplified by building deep 1 well, the well of river page 1, the well of burnt page 1, will
The maximum ancient buried depth (H of Liu Xidi circlemax) obtained by burial history reconstruction.The bottom circle depth of fragility band can be calculated using formula (5), is counted
Calculation the results are shown in Table 2.It can be seen that the bottom circle depth of fragility band changes with the change of maximum ancient buried depth, maximum ancient buried depth is bigger, fragility
The bottom circle depth of band is also bigger.
The Western Hubei-eastern Silurian mud shale fragility band bottom circle buried depth computational chart of table 2
Fig. 5 is obtained by Silurian Longma small stream group mud shale results of triaxial compressive test.Fit correlation formula is obtained by Fig. 5：Y=
112.66x-41.415 understands, and Silurian Longma small stream group mud shale is crisp-and the critical confined pressure of prolonging conversion is 71.2MPa.Again by overlying
Density of earth formations, can be converted into it is crisp-prolong conversion critical depth, i.e. ductility band top circle depth (being shown in Table 3)：
3 Chuan Dong of table-western Hubei Province Silurian Longma small stream group mud shale ductility band top circle result of calculation
Chuan Dong-western Hubei Province Silurian Longma small stream group superstratum averag density is obtained as 2.665 by density log curve
± 0.062g/cm3, the top circle depth (H for obtaining ductility band can be calculatedd) it is about 4470 ± 230m.That is, in west place in Hubei
Eastern Chongqing area, when the buried depth of Silurian Longma small stream group mud shale is more than 4470 ± 230m, just it is changed into ductility.
In a word, the top circle depth of Western Hubei-eastern area Silurian Longma small stream group mud shale ductility band be about 4470 ±
230m, the bottom circle depth of fragility band change with the change of maximum ancient buried depth, and maximum ancient buried depth is bigger, the bottom circle depth of fragility band
Also it is bigger.
While it is disclosed that embodiment as above, but described content only to facilitate understand the present invention and adopt
Embodiment, it is not limited to the present invention.Any those skilled in the art to which this invention pertains, this is not being departed from
On the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But the scope of patent protection of the present invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
1. a kind of mud shale is crisp-prolong intermediate zone and determine method, including：
Fragility band bottom circle determines step, and fragility band bottom circle is determined using mud shale overconsolidation ratio threshold value and maximum ancient buried depth；
Ductility band top circle determines step, using it is crisp-prolong the critical confined pressure of conversion and determine ductility band top circle；
It is crisp-to prolong intermediate zone and determine step, using fragility band bottom circle and ductility band top circle determine it is crisp-prolong intermediate zone.
2. according to the method for claim 1, it is characterised in that fragility band bottom circle determines that step further comprises：
Nominal consolidation pressure is determined using uniaxial strain test；
The mud shale overconsolidation ratio under different confined pressures is calculated according to nominal consolidation pressure and triaxial compression test；
It is fitted by data and determines mud shale overconsolidation ratio threshold value；
Fragility band bottom circle is determined according to mud shale overconsolidation ratio threshold value.
3. according to the method for claim 2, it is characterised in that the nominal consolidation pressure obtains in the following manner：
Pass through uniaxial strain test test sample data；
Axial stress-lateral stress cross plot is drawn according to Example Test Data；
The axial stress corresponding to the point that cross plot upper curve slope is transferred is chosen as nominal consolidation pressure.
4. according to the method in claim 2 or 3, it is characterised in that according to nominal consolidation pressure and triaxial compression test meter
Calculate the mud shale overconsolidation ratio under different confined pressures.
5. according to the method for claim 4, it is characterised in that be fitted by data and determine mud shale overconsolidation ratio threshold value
Further comprise：
Mud shale overconsolidation ratio and normalization shear strength relational expression are established using stress history and normalization soil body engineering method：
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<mo>/</mo>
<msub>
<mi>&sigma;</mi>
<mn>3</mn>
</msub>
<mo>=</mo>
<msub>
<mi>a</mi>
<mn>1</mn>
</msub>
<msup>
<mrow>
<mo>(</mo>
<mi>O</mi>
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<mo>)</mo>
</mrow>
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<mi>b</mi>
<mn>1</mn>
</msub>
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Wherein, qu/σ3To normalize shear strength, quFor corresponding deviator stress, σ in triaxial compression test3Tried for triaxial compressions
Corresponding confined pressure in testing, OCR be mud shale overconsolidation ratio, empirical coefficient a1Normalization equivalent to normal consolidation mud shale is cut
Shearing stress, b1For fitting parameter；
WillWhen OCR values, as mud shale overconsolidation ratio threshold value.
6. according to the method any one of claim 2-5, it is characterised in that true according to mud shale overconsolidation ratio threshold value
Determine fragility band bottom circle to further comprise：
Fragility band bottom circle calculating formula is determined according to mud shale overconsolidation ratio threshold value and the definition of mud shale overconsolidation ratio：
<mrow>
<msub>
<mi>H</mi>
<mi>b</mi>
</msub>
<mo>&ap;</mo>
<mfrac>
<msub>
<mi>H</mi>
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Wherein, HbFor fragility band bottom circle depth, HmaxFor maximum ancient buried depth, OCRLFor mud shale overconsolidation ratio threshold value.
7. according to the method for claim 1, it is characterised in that ductility band top circle determines that step further comprises：
Using triaxial compression test data acquisition mud shale it is crisp-prolong the critical confined pressure of conversion；
Using mud shale it is crisp-prolong conversion critical confined pressure conversion for depth and as the top circle depth of ductility band.
8. according to the method for claim 7, it is characterised in that using triaxial compression test data acquisition mud shale it is crisp-prolong
Critical confined pressure is converted to further comprise：
Using triaxial compression test data, mud shale residual strength/peak strength is calculated；
Work out the cross plot of confined pressure and residual strength/peak strength；
Cross plot described in linear fit obtains the mathematical modulo between the confined pressure of different type mud shale and residual strength/peak strength
Type, residual strength/confined pressure when peak strength is 1 is that mud shale is crisp-prolong the critical confined pressure of conversion.
9. according to the method for claim 8, it is characterised in that by mud shale it is crisp-to prolong conversion critical confined pressure conversion be depth
And further comprise as the top circle depth of ductility band：
If confined pressure and residual strength/peak strength are in following relation：
Y=a2x-b2
Wherein, y is confined pressure, and x is residual strength/peak strength, a2、b2For fitting coefficient；
Ductility band top circle is converted according to confined pressure value during x=1：
Hd=100 × (a2-b2)/(ρ-1.07)
Wherein, HdFor ductility band top circle, ρ is superstratum density.
10. according to the method for claim 1, it is characterised in that crisp-to prolong intermediate zone and determine that step further comprises：It is described
Ductility band top bound pair answers depth and the fragility band bottom bound pair answer depth intervals within the scope of the difference of depth for it is crisp-prolong intermediate zone.
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Cited By (3)
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| CN109323925A (en) * | 2018-09-25 | 2019-02-12 | 西南科技大学 | A kind of method and system for testing name consolidation pressure mud shale early period |
| CN110231407A (en) * | 2018-03-06 | 2019-09-13 | 中国石油化工股份有限公司 | A method of judging carbonate rock effective seal rock |
| CN110296897A (en) * | 2018-03-22 | 2019-10-01 | 中国石油化工股份有限公司 | A kind of mud shale preconsolidation pressure determines method |
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