CN107524439A - The Forecasting Methodology and device of marine facies shale formation cracking depth - Google Patents

The Forecasting Methodology and device of marine facies shale formation cracking depth Download PDF

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Publication number
CN107524439A
CN107524439A CN201710684941.5A CN201710684941A CN107524439A CN 107524439 A CN107524439 A CN 107524439A CN 201710684941 A CN201710684941 A CN 201710684941A CN 107524439 A CN107524439 A CN 107524439A
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China
Prior art keywords
pressure
core
marine facies
depth
facies shale
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CN201710684941.5A
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CN107524439B (en
Inventor
张昆
姜振学
黄舟
黄一舟
刘天琳
谢雪恋
阴丽诗
贾承造
宋岩
王朋飞
金璨
高之业
薛子鑫
文铭
刘伟伟
程四洪
陈煌
黄璞
高凤琳
王幸蒙
李宜润
黄睿哲
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China University of Petroleum Beijing CUPB
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China University of Petroleum Beijing CUPB
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells

Abstract

The invention provides a kind of Forecasting Methodology and device of marine facies shale formation cracking depth, including:Apply on each first core in first axle pressure and the first confined pressure at least two group of first core, apply to the first axle pressure value difference on the first different cores, the first core is in first axle pressure with being in poised state under the first confined pressure;On the basis of the first confined pressure is initial value, is changed with production decline law and applied to the first confined pressure on the first core;The second confined pressure is obtained, the second confined pressure is the confined pressure that the first core moment of rupture is applied thereto;According to the second confined pressure, the axle pressure and the relation of marine facies shale formation cracking depth of marine facies shale are obtained, the number of every group of first core is more than or equal to 1.Above-mentioned Forecasting Methodology provided by the invention, it is contemplated that the influence factor to the rupture of marine facies shale formation of crustal stress, improve the accuracy of marine facies shale formation cracking depth prediction.

Description

The Forecasting Methodology and device of marine facies shale formation cracking depth
Technical field
The present embodiments relate to unconventionaloil pool exploration engineering field, more particularly to a kind of rupture of marine facies shale formation are deep The Forecasting Methodology and device of degree.
Background technology
Marine facies shale gas be contain marine facies shale be available for exploitation unconventional gas resource, due to its have it is larger Exploitation Potential, thus it is in the last few years in oil gas field priority research areas to turn into.But with marine facies shale block not With and the change due to the height above sea level of same block caused by marine facies shale structural evolution, marine facies shale gas in marine facies shale Contain depth difference, and then marine facies shale formation cracking depth is also different, and the depth that appearances of marine facies shale ruptures is extra large The minimum depth of phase shale gas.Therefore, need to determine its minimum depth before exploiting marine facies shale gas, and then determine drilling depth.
In the prior art, on the block of same marine facies shale, according to the drilling depth for having bored marine facies shale gas well and Its gas-bearing property, carry out the summary of experience of this block marine facies shale gas buried depth.Then, marine facies shale is determined according to above-mentioned summary of experience Formation fracture depth, so as to determine the drilling depth of marine facies shale gas well to be drilled.
However, the accuracy of the marine facies shale formation cracking depth determined using prior art is had much room for improvement.
The content of the invention
The embodiments of the invention provide a kind of Forecasting Methodology and device of marine facies shale formation cracking depth, to improve marine facies The accuracy of the cracking depth prediction of shale formation.
First aspect of the embodiment of the present invention provides a kind of Forecasting Methodology of marine facies shale formation cracking depth, including:
Apply on each described first core in first axle pressure and the first confined pressure at least two group of first core, apply Numerical value to the first axle pressure on different first cores is different, and first core is in first axle pressure and described the Poised state is under one confined pressure;
Each described first core is directed to, on the basis of first confined pressure is initial value, is successively decreased rule with first Rule, which changes, to be applied to the first confined pressure on first core;
The second confined pressure is obtained, second confined pressure is the confined pressure that the first core moment of rupture is applied thereto;
According to second confined pressure, the axle pressure of marine facies shale and the relation of marine facies shale formation cracking depth are obtained;
Wherein, the first axle presses the crustal stress being subject to for simulating first core, and first confined pressure is used for mould Intend the hydrostatic pressure that first core is subject to, the number of the first core described in every group is more than or equal to 1.
Optionally, different first cores corresponds to different blocks.
Optionally, first production decline law includes:Exponential decrease rule or linear decrease rule;
It is described on the basis of first confined pressure is initial value, changed with the first production decline law and applied to first rock The first confined pressure on core, including:
On the basis of first confined pressure is initial value, is changed with exponential decrease rule and applied to first core The first confined pressure;
Or, on the basis of first confined pressure is initial value, is changed with linear decrease rule and applied to first rock The first confined pressure on core.
Optionally, described according to second confined pressure, the axle for obtaining marine facies shale is pressed and marine facies shale formation cracking depth Relation, including:
Corresponding depth when obtaining each first core rupture according to P=ρ gH;
With the first approximating method described the according to corresponding to corresponding depth during each first core rupture and its One axle pressure, fitting obtain the axle pressure and the relation of marine facies shale formation cracking depth of marine facies shale;
Wherein, the P is second confined pressure, and the ρ is the density of water, and the g is acceleration of gravity, and the H is institute State corresponding depth when the first core corresponding to the second confined pressure ruptures.
Optionally, first approximating method includes:Linear approximating method or non-linear fitting method;
Corresponding depth when being ruptured with the first approximating method according to each first core and its corresponding institute First axle pressure is stated, fitting obtains the axle pressure and the relation of marine facies shale formation cracking depth of marine facies shale, including:
With linear approximating method described the according to corresponding to corresponding depth during each first core rupture and its One axle pressure, fitting obtain the axle pressure and the relation of marine facies shale formation cracking depth of marine facies shale;
Or, corresponding depth and its corresponding institute when being ruptured with non-linear fitting method according to each first core First axle pressure is stated, fitting obtains the axle pressure and the relation of marine facies shale formation cracking depth of marine facies shale.
Second aspect of the embodiment of the present invention provides a kind of prediction meanss of marine facies shale formation cracking depth, including:
First pressure module, the first pressure module, which is used to applying first axle, is depressed into each of at least two group of first core On individual first core, apply to the numerical value difference of the first axle pressure on different first cores;
Second pressure module, the second pressure module are used to apply the first confined pressure to above-mentioned at least two group of first core On each described first core, first core is in first axle pressure with being in poised state under first confined pressure;
Each described first core is directed to, the second pressure module is additionally operable in first confined pressure be initial value On the basis of, changed with the first production decline law and applied to the first confined pressure on first core;
Acquisition module, the acquisition module are used to obtain the second confined pressure, and second confined pressure ruptures for first core The confined pressure that moment is applied thereto;
Computing module, the computing module are used for axle pressure and the marine facies page that marine facies shale is obtained according to second confined pressure The relation of rock formation fracture depth;
Wherein, the first axle presses the crustal stress being subject to for simulating first core, and first confined pressure is used for mould Intend the hydrostatic pressure that first core is subject to, the number of the first core described in every group is more than or equal to 1.
Optionally, different first cores corresponds to different blocks.
Optionally, first production decline law includes:Exponential decrease rule or linear decrease rule;
The second pressure module is specifically used for, and on the basis of first confined pressure is initial value, is advised with exponential decrease Rule, which changes, to be applied to the first confined pressure on first core;
Or, the second pressure module is specifically used for, on the basis of first confined pressure is initial value, with linear decrease Rule, which changes, to be applied to the first confined pressure on first core.
Optionally, computing module includes:
Calculating sub module, the calculating sub module, which is used to be obtained when each first core ruptures according to P=ρ gH, to be corresponded to Depth;
Submodule is fitted, when the fitting submodule is used to rupture according to each first core with the first approximating method Corresponding depth and the first axle pressure corresponding to it, the axle pressure of fitting acquisition marine facies shale and the rupture of marine facies shale formation are deep The relation of degree;
Wherein, the P is second confined pressure, and the ρ is the density of water, and the g is acceleration of gravity, and the H is institute State corresponding depth when the first core corresponding to the second confined pressure ruptures.
Optionally, first approximating method includes:Linear approximating method or non-linear fitting method;
The fitting submodule is specifically used for, corresponding when being ruptured with linear approximating method according to each first core Depth and the first axle pressure corresponding to it, fitting obtain axle pressure and the pass of marine facies shale formation cracking depth of marine facies shale System;
Or, the fitting submodule is specifically used for, when being ruptured with non-linear fitting method according to each first core Corresponding depth and the first axle pressure corresponding to it, the axle pressure of fitting acquisition marine facies shale and the rupture of marine facies shale formation are deep The relation of degree.
The Forecasting Methodology and device of a kind of marine facies shale formation cracking depth provided in an embodiment of the present invention, wherein, it is above-mentioned Method includes:Apply on each described first core in first axle pressure and the first confined pressure at least two group of first core, apply The numerical value of the first axle pressure added on different first cores is different, first core the first axle press with it is described Poised state is under first confined pressure;Each described first core is directed to, on the basis that first confined pressure is initial value On, changed with the first production decline law and applied to the first confined pressure on first core;Obtain the second confined pressure, second confined pressure The confined pressure being applied thereto for the first core moment of rupture;According to second confined pressure, obtain the axle pressure of marine facies shale with The relation of marine facies shale formation cracking depth;Wherein, the first axle presses the crustal stress being subject to for simulating first core, Second confined pressure be used for simulate the hydrostatic pressure that first core is subject to, the number of the first core described in every group be more than etc. In 1.After the crustal stress for obtaining marine facies shale gas well to be drilled, the marine facies shale formation cracking depth that provides according to embodiments of the present invention Forecasting Methodology obtain axle pressure (crustal stress) and the relation of marine facies shale formation cracking depth, obtain at marine facies shale gas well to be drilled There is the depth ruptured in marine facies shale formation, i.e. the minimum depth of marine facies shale gas, and then determine marine facies shale gas to be drilled herein The drilling depth of well.The Forecasting Methodology of marine facies shale bottom cracking depth provided in an embodiment of the present invention, it is contemplated that crustal stress To the influence factor of marine facies shale formation rupture, the accuracy that marine facies shale formation cracking depth is predicted can be improved.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the required accompanying drawing used in technology description to do one and simply introduce, it should be apparent that, drawings in the following description are this hairs Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the Forecasting Methodology embodiment one of marine facies shale bottom cracking depth of the present invention;
Fig. 2 is the schematic flow sheet of the Forecasting Methodology embodiment two of marine facies shale bottom cracking depth of the present invention;
Fig. 3 is the structural representation of the prediction meanss embodiment one of marine facies shale bottom cracking depth of the present invention;
Fig. 4 is the structural representation of the prediction meanss embodiment two of marine facies shale bottom cracking depth of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.
Term " first ", " second ", " the 3rd " in description and claims of this specification and above-mentioned accompanying drawing and/or (if present)s such as " the 4 " is for distinguishing similar object, without for describing specific order or precedence.Should The data that the understanding so uses can exchange in the appropriate case, so as to embodiments of the invention described herein, such as can Enough orders with addition to those for illustrating or describing herein are implemented.In addition, term " comprising " and " having " and they Any deformation, it is intended that cover it is non-exclusive include, for example, containing the process of series of steps or unit, method, being System, product or equipment are not necessarily limited to those steps or the unit clearly listed, but may include not list clearly or For the intrinsic other steps of these processes, method, product or equipment or unit.
In the prior art, on the block of same marine facies shale, according to the drilling depth for having bored marine facies shale gas well and Its gas-bearing property, carry out the summary of experience of this block marine facies shale gas buried depth.Marine facies shale formation is determined according to above-mentioned summary of experience The depth of rupture, the drilling depth of marine facies shale gas well to be drilled is determined, the depth of the marine facies shale formation rupture of such a determination Accuracy has much room for improvement.
The embodiments of the invention provide the Forecasting Methodology of marine facies shale formation cracking depth to obtain axle pressure (crustal stress) and sea The relation of phase shale formation cracking depth, after the crustal stress for obtaining marine facies shale gas well to be drilled, obtain marine facies shale gas well to be drilled The depth that the appearance of place's marine facies shale ruptures, the i.e. the minimum depth of marine facies shale gas, and then determine marine facies shale gas to be drilled herein The drilling depth of well.The Forecasting Methodology of marine facies shale bottom cracking depth provided in an embodiment of the present invention, it is contemplated that crustal stress To the influence factor of marine facies shale formation rupture, the accuracy that marine facies shale formation cracking depth is predicted can be improved.
It is provided by the invention that technical scheme is described in detail with specifically embodiment below.This is several below Individual specific embodiment can be combined with each other, may be no longer superfluous in some embodiments for same or analogous concept or process State.
Fig. 1 be marine facies shale bottom cracking depth of the present invention Forecasting Methodology embodiment one schematic flow sheet, reference chart 1, the Forecasting Methodology for the marine facies shale bottom cracking depth that the present embodiment provides includes herein below.
Step 101:Apply each described first rock in first axle pressure and the first confined pressure at least two group of first core On core, apply to the numerical value difference of the first axle pressure on different first cores, first core is in the first axle Pressure under first confined pressure with being in poised state.
Specifically, the first core of the different groups is taken at different blocks.For example, obtain the rock from 4 blocks Core, it is respectively used to the depth of the marine facies shale formation rupture of 4 blocks corresponding to simulation.Every group includes more than MiIndividual rock Core, wherein, MiFor the integer more than or equal to 1,1≤i≤4.
Further, apply on first axle pressure and the first confined pressure to each first core, wherein, the first axle pressure is used In the crustal stress that simulation first core is subject to, first confined pressure is used to simulate the hydrostatic pressing that first core is subject to Power.Also, in order to further improve the precision of axle pressure (crustal stress) and marine facies shale formation cracking depth relation, apply to difference First core on first axle pressure numerical value it is different.
Further, the first core for being applied with first axle pressure and the first confined pressure is in poised state.Simulate marine facies Shale underground initial equilibrium conditionses, now, by transverse direction due to crustal stress caused by tectonism and longitudinal direction due to upper Cover hydrostatic pressure caused by the weight of stratum water in formation pore.
Step 102:Each described first core is directed to, on the basis of first confined pressure is initial value, with the One production decline law, which changes, to be applied to the first confined pressure on first core.
Step 103:The second confined pressure is obtained, second confined pressure is enclosed for what the first core moment of rupture was applied thereto Pressure.
Specifically, simulated in a manner of changing and applying to the first confined pressure on first core by the first production decline law The lifting of first core.
More specifically, each described first core is directed to, on the basis of above-mentioned poised state, keeps first axle The numerical value of pressure is constant, is changed with the first production decline law and applied to the first confined pressure on first core.Simulate marine facies shale It is the definite value numerical value of first axle pressure (keep constant) in crustal stress horizontal suffered by underground, and lifting due to stratum and degrades It can cause hydrostatic pressure caused by superstratum is gradually reduced (to change with the first production decline law and apply to first core First confined pressure).
Further, decline by the confined pressure of the first core come during simulating marine facies shale formation lifting, when the When one confined pressure drops to a certain numerical value (when marine facies shale corresponding to i.e. is raised to a certain depth), the first core sea can be in first axle Rupture (i.e. marine facies shale can be ruptured due to horizontal Shangdi stress) occurs for pressure, now, suffered by the first core Confined pressure is the second confined pressure, and marine facies shale is in corresponding to second confined pressure during subterranean depth, natural gas in marine facies shale Scattered and disappeared because marine facies shale ruptures, then do not utilize the collection of marine facies shale gas.When drilling depth is more than second confined pressure pair During the subterranean depth answered, marine facies shale gas possesses the condition being produced.
Step 104:According to second confined pressure, the axle pressure of acquisition marine facies shale and the pass of marine facies shale formation cracking depth System.
Specifically, first axle pressure and the second confined pressure corresponding to the first core according at least two groups, obtain marine facies shale Axle pressure and the relation of marine facies shale formation cracking depth.
The Forecasting Methodology for the marine facies shale formation cracking depth that the present embodiment provides obtains axle pressure (crustal stress) and marine facies page The relation of rock formation fracture depth, after the crustal stress for obtaining marine facies shale gas well to be drilled, obtain extra large at marine facies shale gas well to be drilled The depth that the appearance of phase shale ruptures, the i.e. the minimum depth of marine facies shale gas, and then determine marine facies shale gas well to be drilled herein Drilling depth.The present embodiment provide marine facies shale bottom cracking depth Forecasting Methodology, it is contemplated that crustal stress to marine facies page The influence factor of rock formation fracture, the accuracy of marine facies shale formation cracking depth prediction can be improved.Such as marine facies shale Layer causes the lifting of layer position in structural evolution, and the method provided by the present embodiment can still obtain after its crustal stress is obtained The real depth that its marine facies shale bottom ruptures.
Further, different first cores corresponds to different blocks, by being derived from the core of different blocks, obtains Axle pressure (crustal stress) and the relation of marine facies shale formation cracking depth.So as to, it is directed in the prior art, on same block, According to the drilling depth and its gas-bearing property for having bored marine facies shale gas well, the experience for carrying out this block marine facies shale gas buried depth is total Knot, the method that the present embodiment provides are not limited to suitable for some block, but summarize the marine facies shale suitable for multiple blocks The relation of formation fracture depth and axle pressure (crustal stress).Therefore, the marine facies shale bottom cracking depth of the present embodiment offer is pre- Survey method has general applicability.
Fig. 2 be marine facies shale bottom cracking depth of the present invention Forecasting Methodology embodiment two schematic flow sheet, this implementation Example is carried out on the basis of embodiment one.With reference to figure 2, the present embodiment includes herein below.
Step 201:Apply each described first rock in first axle pressure and the first confined pressure at least two group of first core On core, apply to the numerical value difference of the first axle pressure on different first cores, first core is in the first axle Pressure under first confined pressure with being in poised state.
The embodiment of step 201 is identical with step 101, will not be repeated here.
Step 202:Each described first core is directed to, on the basis of first confined pressure is initial value, to refer to Number production decline law, which changes, to be applied to the first confined pressure on first core;Or, on the basis that first confined pressure is initial value On, changed with linear decrease rule and applied to the first confined pressure on first core.
Specifically, changed with the first production decline law and applied on the basis of first confined pressure is initial value in step 102 The specific implementation of the first confined pressure on to first core includes two kinds described in step 202:In first confined pressure On the basis of initial value, changed with exponential decrease rule and applied to the first confined pressure on first core;Or, described On the basis of one confined pressure is initial value, is changed with linear decrease rule and applied to the first confined pressure on first core.
Apply it should be noted that the present embodiment is realized to change to the specific implementation of the first confined pressure on first core Mode is not limited to above two, can be the achievable any mode in this area.
Step 203:The second confined pressure is obtained, second confined pressure is enclosed for what the first core moment of rupture was applied thereto Pressure.
The embodiment of step 203 is identical with step 103, will not be repeated here.
Step 204:Corresponding depth when obtaining each first core rupture according to P=ρ gH.
Step 205:Corresponding depth and its correspondence when being ruptured with the first approximating method according to each first core The first axle pressure, fitting obtains the axle pressure and the relation of marine facies shale formation cracking depth of marine facies shale.
Wherein, the P is second confined pressure, and the ρ is the density of water, and the g is acceleration of gravity, and the H is institute State corresponding depth when the first core corresponding to the second confined pressure ruptures.
Specifically, step 204 and step 205 are a kind of specific implementations of step 104, including according to the second confined pressure P Corresponding depth when the relational expression P=ρ gH of corresponding depth H obtain each first core rupture when being ruptured with the first core Degree;Then the axle pressure and the relation of marine facies shale formation cracking depth for obtaining marine facies shale are fitted by the first approximating method.Can Choosing, first approximating method includes:Linear approximating method or non-linear fitting method etc..
The pre- of the marine facies shale bottom cracking depth of the offer of embodiment two is be provided below by specific embodiment Survey method.
(1) to being derived from the drill core of different blocks shale gas well as the first core, for doing three axle physical analogys reality Test, each first core is applied respectively first axle pressure (be used for simulate the first core in the horizontal crustal stress suffered by underground) with And first confined pressure (being used to simulate the first core in longitudinal hydrostatic pressure suffered by underground);Further, the first confined pressure is first On the basis of initial value, changed with linear decrease rule and applied to the first confined pressure on first core, recorded each core and exist Confined pressure (i.e. the second confined pressure) when corresponding first axle pressure ruptures.Wherein, reference table 1, first row represent each first First axle pressure (A corresponding to core1、A2、A3……An, unit MPa), secondary series is represented second corresponding to each first core Confined pressure (B1、B2、B3……Bn, unit MPa).Wherein, n is positive integer, and n values are bigger, is more advantageous to further improve prediction As a result precision;A and B is positive number.
(2) the second confined pressure and corresponding the minimum depth are calculated by equation below corresponding to each first core:P=ρ GH, wherein, the P is second confined pressure, and the ρ is the density of water, and the g is acceleration of gravity, and the H is described second Corresponding depth when first core corresponding to confined pressure ruptures.Reference table 1, the 3rd row represent the minimum depth (H1、H、H3……Hn, it is single Position is m).Wherein, H is positive number.
Table 1
First axle pressure/MPa Second confined pressure/MPa The minimum depth/m
A1 B1 H1
A2 B2 H2
A3 B3 H3
…… …… ……
An Bn Hn
(3) corresponding relation of first axle pressure and the minimum depth according to corresponding to each first core in table 1, fitting obtain sea The axle pressure (crustal stress) of phase shale and the relation of marine facies shale formation cracking depth.It is exemplary, obtained according to upper table 1 it is following, The axle pressure (crustal stress) of marine facies shale and the relational expression of marine facies shale formation cracking depth:H=15.404A-754.41, wherein A Represent axle pressure (crustal stress), unit MPa;H represents buried depth, unit m.
(4) regional structure to a certain new block is analyzed, and draws the crustal stress of the block, and crustal stress data are substituted into In the axle pressure (crustal stress) of above-mentioned marine facies shale and the relational expression of marine facies shale formation cracking depth, you can the new district is calculated Block marine facies shale formation cracking depth.
The present embodiment is provided in the Forecasting Methodology of marine facies shale bottom cracking depth, by keeping applying to each first rock In the case of first axle pressure on core is immovable, is changed with exponential decrease rule or linear decrease rule and applied to first rock The first confined pressure on core, with simulation still want to shale superstratum caused by hydrostatic pressure be gradually reduced;When the first confined pressure drops to During a certain numerical value (when corresponding marine facies shale is raised to a certain depth), the first core sea can depress in first axle rupture (i.e. marine facies shale can be ruptured due to horizontal Shangdi stress), now, the confined pressure suffered by the first core are enclosed for second Pressure, and marine facies shale is in corresponding to second confined pressure during subterranean depth, and natural gas is a large amount of due to rupturing in marine facies shale Scatter and disappear.Further according to the second confined pressure and corresponding first axle pressure, fitting obtains the axle pressure and marine facies shale formation of marine facies shale The relation of cracking depth.And then for the block of marine facies shale gas well to be drilled, after obtaining its crustal stress, it can be answered with base area The minimum depth corresponding to power determines well depth to be drilled.The Forecasting Methodology for the marine facies shale bottom cracking depth that the present embodiment provides, is examined The influence factor to the rupture of marine facies shale formation of crustal stress is considered, the essence of marine facies shale formation cracking depth prediction can be improved True property.
Fig. 3 be marine facies shale bottom cracking depth of the present invention prediction meanss embodiment one structural representation, reference chart 3, the prediction meanss for the marine facies shale bottom cracking depth that the present embodiment provides, including:The first pressure pressure mould of module 31, second Block 32, acquisition module 33 and computing module 34.
Wherein, the first pressure module 31 be used to applying first axle be depressed at least two group of first core each described in On first core, apply to the numerical value difference of the first axle pressure on different first cores;
The second pressure module 32 is used to apply described in the first confined pressure to each of above-mentioned at least two group of first core On first core, first core is in first axle pressure with being in poised state under first confined pressure;
Each described first core is directed to, the second pressure module 32 is additionally operable in first confined pressure be initial On the basis of value, changed with the first production decline law and applied to the first confined pressure on first core;
The acquisition module 33 is used to obtain the second confined pressure, and second confined pressure applies for the first core moment of rupture To confined pressure thereon;
The axle pressure that the computing module 34 is used to obtain marine facies shale according to second confined pressure is broken with marine facies shale formation Split the relation of depth;
Wherein, the axle presses the crustal stress being subject to for simulating first core, and the confined pressure is used to simulating described the The hydrostatic pressure that one core is subject to.
Part in the above-mentioned prediction meanss based on marine facies shale bottom cracking depth, it accordingly can perform embodiment The technical scheme of the Forecasting Methodology of marine facies shale bottom cracking depth in one, its implementing principle and technical effect is similar, herein not Repeat again.
Fig. 4 be marine facies shale bottom cracking depth of the present invention prediction meanss embodiment two structural representation, reference chart The prediction meanss of 4, Fig. 4 marine facies shale bottom cracking depth are carried out on the basis of Fig. 3, the marine facies that the present embodiment provides The prediction meanss of shale bottom cracking depth, in addition to herein below.
Optionally, first production decline law includes:Exponential decrease rule or linear decrease rule;
The second pressure module 32 is specifically used for, on the basis of first confined pressure is initial value, with the index Production decline law, which changes, to be applied to the first confined pressure on first core;Or, the second pressure module 32 is specifically used for, in institute The first confined pressure is stated to enclose on the basis of initial value, to change to apply to first on first core with the linear decrease rule Pressure.
Computing module 34 includes:Calculating sub module 341 and fitting submodule 342, wherein, the calculating sub module 341 is used Corresponding depth when each first core rupture is obtained according to P=ρ gH;The fitting submodule 342 is used for first Approximating method obtains according to corresponding depth during each first core rupture and the first axle pressure corresponding to it, fitting The axle pressure and the relation of marine facies shale formation cracking depth of marine facies shale.
Wherein, the P is second confined pressure, and the ρ is the density of water, and the g is acceleration of gravity, and the H is institute State corresponding depth when the first core corresponding to the second confined pressure ruptures.
Optionally, first approximating method includes:Linear approximating method or non-linear fitting method;
The fitting submodule 342 is specifically used for, and is ruptured with the linear approximating method according to each first core When corresponding depth and its corresponding to described first axle pressure, fitting obtain marine facies shale axle pressure with marine facies shale formation rupture The relation of depth;Or, the fitting submodule 342 is specifically used for, with the non-linear fitting method according to each described first Corresponding depth and the first axle pressure corresponding to it when core ruptures, fitting obtain the axle pressure and marine facies shale of marine facies shale The relation of formation fracture depth
Part in the above-mentioned prediction meanss based on marine facies shale bottom cracking depth, it accordingly can perform embodiment The technical scheme of the Forecasting Methodology of marine facies shale bottom cracking depth in two, its implementing principle and technical effect is similar, herein not Repeat again.
One of ordinary skill in the art will appreciate that:Realizing all or part of step of above-mentioned each method embodiment can lead to The related hardware of programmed instruction is crossed to complete.Foregoing program can be stored in a computer read/write memory medium.The journey Sequence upon execution, execution the step of including above-mentioned each method embodiment;And foregoing storage medium includes:ROM, RAM, magnetic disc or Person's CD etc. is various can be with the medium of store program codes.
Finally it should be noted that:Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations;To the greatest extent The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that:Its according to The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered Row equivalent substitution;And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology The scope of scheme.

Claims (10)

  1. A kind of 1. Forecasting Methodology of marine facies shale formation cracking depth, it is characterised in that including:
    Apply on each described first core in first axle pressure and the first confined pressure at least two group of first core, apply to not The numerical value of first axle pressure on same first core is different, and first core is pressed in the first axle to be enclosed with described first Pressure is in poised state;
    Each described first core is directed to, on the basis of first confined pressure is initial value, is changed with the first production decline law Become and apply to the first confined pressure on first core;
    The second confined pressure is obtained, second confined pressure is the confined pressure that the first core moment of rupture is applied thereto;
    According to second confined pressure, the axle pressure of marine facies shale and the relation of marine facies shale formation cracking depth are obtained;
    Wherein, the first axle presses the crustal stress being subject to for simulating first core, and first confined pressure is used to simulate institute The hydrostatic pressure that the first core is subject to is stated, the number of the first core described in every group is more than or equal to 1.
  2. 2. according to the method for claim 1, it is characterised in that first core of difference group corresponds to different blocks.
  3. 3. according to the method for claim 1, it is characterised in that first production decline law includes:Exponential decrease rule or Linear decrease rule;
    It is described on the basis of first confined pressure is initial value, changed with the first production decline law and applied on first core The first confined pressure, including:
    On the basis of first confined pressure is initial value, is changed with the exponential decrease rule and applied to first core The first confined pressure;
    Or, on the basis of first confined pressure is initial value, is changed with the linear decrease rule and applied to first rock The first confined pressure on core.
  4. 4. according to the method for claim 1, it is characterised in that it is described according to second confined pressure, obtain marine facies shale Axle presses the relation with marine facies shale formation cracking depth, including:
    Corresponding depth when obtaining each first core rupture according to P=ρ gH;
    With the first approximating method according to corresponding depth during each first core rupture and the first axle corresponding to it Pressure, fitting obtain the axle pressure and the relation of marine facies shale formation cracking depth of marine facies shale;
    Wherein, the P is second confined pressure, and the ρ is the density of water, and the g be acceleration of gravity, and the H is described the Corresponding depth when first core corresponding to two confined pressures ruptures.
  5. 5. according to the method for claim 4, it is characterised in that first approximating method includes:Linear approximating method or Non-linear fitting method;
    Corresponding depth when being ruptured with the first approximating method according to each first core and its corresponding to described the One axle pressure, fitting obtain the axle pressure and the relation of marine facies shale formation cracking depth of marine facies shale, including:
    With the linear approximating method described the according to corresponding to corresponding depth during each first core rupture and its One axle pressure, fitting obtain the axle pressure and the relation of marine facies shale formation cracking depth of marine facies shale;
    Or, corresponding depth and its corresponding institute when being ruptured with the non-linear fitting method according to each first core First axle pressure is stated, fitting obtains the axle pressure and the relation of marine facies shale formation cracking depth of marine facies shale.
  6. A kind of 6. prediction meanss of marine facies shale formation cracking depth, it is characterised in that including:
    First pressure module, the first pressure module are used to apply each institute that first axle is depressed at least two group first core State on the first core, apply to the numerical value difference of the first axle pressure on different first cores;
    Second pressure module, it is each to above-mentioned at least two group of first core that the second pressure module is used to applying the first confined pressure On individual first core, first core is in first axle pressure with being in poised state under first confined pressure;
    Each described first core is directed to, the second pressure module is additionally operable in the base that first confined pressure is initial value On plinth, changed with the first production decline law and applied to the first confined pressure on first core;
    Acquisition module, the acquisition module are used to obtain the second confined pressure, and second confined pressure is the first core moment of rupture The confined pressure being applied thereto;
    Computing module, the computing module is with being used for axle pressure and the marine facies shale that marine facies shale is obtained according to second confined pressure The relation of layer cracking depth;
    Wherein, the first axle presses the crustal stress being subject to for simulating first core, and first confined pressure is used to simulate institute The hydrostatic pressure that the first core is subject to is stated, the number of the first core described in every group is more than or equal to 1.
  7. 7. device according to claim 6, it is characterised in that different first cores correspond to different blocks.
  8. 8. device according to claim 6, it is characterised in that first production decline law includes:Exponential decrease rule or Linear decrease rule;
    The second pressure module is specifically used for, and on the basis of first confined pressure is initial value, is advised with the exponential decrease Rule, which changes, to be applied to the first confined pressure on first core;
    Or, the second pressure module is specifically used for, on the basis of first confined pressure is initial value, with the linear decrease Rule, which changes, to be applied to the first confined pressure on first core.
  9. 9. device according to claim 6, it is characterised in that computing module includes:
    Calculating sub module, the calculating sub module are used to obtain corresponding depth when each first core ruptures according to P=ρ gH Degree;
    Submodule is fitted, the fitting submodule is corresponding when being used to rupture according to each first core with the first approximating method Depth and described first axle pressure corresponding to it, fitting obtain the axle pressure of marine facies shale with marine facies shale formation cracking depth Relation;
    Wherein, the P is second confined pressure, and the ρ is the density of water, and the g be acceleration of gravity, and the H is described the Corresponding depth when first core corresponding to two confined pressures ruptures.
  10. 10. device according to claim 9, it is characterised in that first approximating method includes:Linear approximating method or Non-linear fitting method;
    The fitting submodule is specifically used for, corresponding when being ruptured with the linear approximating method according to each first core Depth and the first axle pressure corresponding to it, fitting obtain axle pressure and the pass of marine facies shale formation cracking depth of marine facies shale System;
    Or, the fitting submodule is specifically used for, when being ruptured with the non-linear fitting method according to each first core Corresponding depth and the first axle pressure corresponding to it, the axle pressure of fitting acquisition marine facies shale and the rupture of marine facies shale formation are deep The relation of degree.
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CN106401576A (en) * 2016-03-17 2017-02-15 成都创源油气技术开发有限公司 Complex shale stratum ground stress test method
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CN201705321U (en) * 2010-05-10 2011-01-12 中国石油天然气股份有限公司 Electric heating oil shale in-situ exploitation analog meter
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Publication number Priority date Publication date Assignee Title
CN111271055A (en) * 2020-02-26 2020-06-12 中国石油大学(北京) Method, device and equipment for determining brittleness index of shale
CN111271055B (en) * 2020-02-26 2021-10-08 中国石油大学(北京) Method, device and equipment for determining brittleness index of shale

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