CN110529104A - A kind of improved abnormal highpressured mudstone velocity fitting method - Google Patents
A kind of improved abnormal highpressured mudstone velocity fitting method Download PDFInfo
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- CN110529104A CN110529104A CN201910820607.7A CN201910820607A CN110529104A CN 110529104 A CN110529104 A CN 110529104A CN 201910820607 A CN201910820607 A CN 201910820607A CN 110529104 A CN110529104 A CN 110529104A
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- 230000002159 abnormal effect Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 32
- 239000004575 stone Substances 0.000 claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 claims description 18
- 230000000694 effects Effects 0.000 claims description 12
- 238000005056 compaction Methods 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 9
- 230000000977 initiatory effect Effects 0.000 claims description 7
- 230000002596 correlated effect Effects 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 description 5
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- G06Q50/02—Agriculture; Fishing; Forestry; Mining
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Abstract
The invention proposes a kind of improved abnormal highpressured mudstone velocity fitting methods, which comprises mudstone stratum abnormal pressure Forming Mechanism differentiates；Establish the functional relation of mud stone density-velocity under the conditions of different abnormal pressure Forming Mechanisms；Abnormal highpressured mudstone speed piecewise fitting.Method provided by the invention considers under the conditions of different abnormal high pressure Forming Mechanisms, mudstone stratum density and speed parameter have different correlated characteristics, overcome the low problem of classical Gardner formula fitting mud stone velocity accuracy, it can be improved the velocity fitting precision of abnormal highpressured mudstone, and then improve the pressure prediction precision based on speed data.
Description
Technical field
The present invention relates to exploration geophysics field, in particular to a kind of improved abnormal highpressured mudstone velocity fitting sides
Method.
Background technique
Strata pressure is dr illing fluid design, the key parameter in well structure design, improves prediction of formation pressure precision energy
The risk in drilling process is enough effectively reduced, improves drillng operation efficiency.The prediction technique of strata pressure may be summarized to be 2 classes,
First is that establish mud stone speed normal compaction trend line, judge stratum with the presence or absence of superpressure, using equivalent depth method, method of Eaton,
The classical ways such as Bowers method calculate pore pressure；Second is that the relationship between mud stone speed and effective stress is established, according to effectively
Stress principle calculates pore pressure.
Currently, the basic data that prediction of formation pressure uses mainly includes interval transit time and seismic velocity, mud stone speed quilt
It is considered to respond effective stress most sensitive parameter.It is approximate using Gardner empirical equation when lacking formation velocity data
Estimated speed is common velocity fitting method.Gardner formula is the average conversion lattice of Velocity-density relation under different lithology
Formula, empirical parameter are influenced very big by area, lithology.It directlys adopt Gardner empirical equation and carries out Velocity-density relation research
When often there is a certain error.
Studies have shown that formation pore structure includes hole and venturi two parts.Pore volume is big, represents total pore space substantially
Size；Venturi is small in size, controls the flowing of pore-fluid.In common logging evaluation parameter, interval transit time belongs to conduction
Attribute, it is very sensitive to the variation of venturi, and density belongs to volume attribute, it is very sensitive to the variation of hole.It is buried with landing surface
Deep to increase, hole is compressed, and formation velocity, density persistently increase.When stratum, which enters undercompaction state, forms abnormal high pressure, hole
Gap is compressed reduced process stands idle or is slowed down, and formation velocity and density are remained unchanged with buried depth, the opposite normal compaction table of strata
It is now low speed, low close feature.When stratum is acted on forming abnormal high pressure by fluid expansion, venturi becomes larger, and hole is basically unchanged, table
Now reduce for formation velocity, and density is basically unchanged.Therefore strata pressure Forming Mechanism can significantly affect formation velocity and density
Relationship.
Summary of the invention
The present invention provides a kind of improved abnormal highpressured mudstone velocity fitting method, it is intended to solve different abnormal high pressures and be formed
Under condition of mechanism, mud stone speed and density have different correlated characteristics, cause to obtain using classics Gardner formula fitting
The low problem of formation velocity precision, can be improved the fitting precision of formation velocity.
Specific steps of the invention include:
Step 1: mudstone stratum abnormal pressure Forming Mechanism differentiates that the Abnormal Formation Pressure Forming Mechanism, which differentiates, to be used
Formation velocity and density cross method；
Step 2: judging speed-density distribution trend, when speed-density distribution trend meets loading curve, shows ground
Stressor layer Forming Mechanism is the effect of single nonequilibrium compaction；Speed-density distribution trend part meets loading curve, partially meets
When unloading curve, show that strata pressure Forming Mechanism is that nonequilibrium compaction effect and fluid expansion act on two kinds of mechanism.
Step 3: establishing the functional relation of mud stone density and speed under the conditions of different abnormal pressure Forming Mechanisms,
It is the stratum of nonequilibrium compaction effect for pressure initiation mechanism using abnormal highpressured mudstone speed piecewise fitting,
Fitting function uses Gardner formula.It is the stratum of fluid expansion effect for pressure initiation mechanism, fitting function uses, formula
Middle ρ 0, V0, A and B are fitting parameter.
V0 is minimum speed in above-mentioned parameter, and ρ 0 is minimum speed V0 corresponding density, parameter used in A and B matched curve.
Beneficial effects of the present invention and feature are: under the conditions of considering different abnormal high pressure Forming Mechanisms, mud stone speed
There is different correlated characteristics with density.According to the difference of mud stone abnormal high pressure Forming Mechanism, piecewise fitting speed-density function
Relationship overcomes the low problem of formation velocity precision that classical Gardner formula fitting method obtains, stratum is greatly improved
The precision of velocity fitting.
Detailed description of the invention
1 abnormal highpressured mudstone velocity fitting flow chart of attached drawing.
2 mud stone density-velocity of attached drawing crosses schematic diagram.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, it will combine in the embodiment of the present invention
Attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described.Described embodiment is of the invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
A kind of improved abnormal highpressured mudstone velocity fitting method provided in an embodiment of the present invention, is said in conjunction with attached drawing 1
Bright, specific implementation step is as follows:
(1) identification of mud stone interval is carried out according to well logging gamma or shale content data.
(2) speed and density log data of shale layer are extracted, and carries out intersection's reason.The figure abscissa that crosses is density,
Ordinate is speed, and colour code is vertical depth.
(3) Abnormal Formation Pressure Forming Mechanism is determined according to the cross trend of distribution of mud stone speed-density.For superficial part mud
Rock formation velocity-Density Distribution trend, referred to as loading procedure, corresponding abnormal high pressure Forming Mechanism are stratum nonequilibrium compaction work
With.For deep mudstone stratum speed-density distribution trend, if similar to shallow stratum trend, deep formation pore-pressure shape
It is still nonequilibrium compaction effect in stratum at mechanism；If deviateing the distribution trend of shallow stratum, deep formation pore-pressure forms machine
It is made as fluid expansion effect.
(4) stratum pressing force Forming Mechanism is divided into two sections by the critical depth for determining Different Strata pressure initiation mechanism.
(5) it to the interval of different pressures Forming Mechanism, carries out mud stone speed-density and crosses processing, it is close to be fitted mud stone speed-
The functional relation of degree.It is the interval of stratum nonequilibrium compaction effect for pressure initiation mechanism, fitting function meets Gardner public affairs
The form of formula, parameter A and B in formula are solved according to real data.It is the layer of fluid expansion effect for pressure initiation mechanism
Section, the form of fitting function coincidence formula, parameter ρ 0, V0, A and B in formula are solved according to real data.
(6) to the interval of different pressures Forming Mechanism, the fitting function for utilizing (5) to obtain calculates mudstone stratum speed.
(7) fusion treatment is carried out to the mudstone stratum speed calculated in (6).
It is as shown in Figure 2 to be carried out curve fitting according to actual loaded process data and uninstall process data as a result, fitting
Curve has met the result of actual measurement well.
Claims (1)
1. a kind of improved abnormal highpressured mudstone velocity fitting method, which is characterized in that the described method includes:
Step 1: mudstone stratum abnormal pressure Forming Mechanism differentiates that the Abnormal Formation Pressure Forming Mechanism, which differentiates, uses stratum
Speed and density cross method；
Step 2: judging speed-density distribution trend, when speed-density distribution trend meets loading curve, is laminated with showing
Power Forming Mechanism is the effect of single nonequilibrium compaction；Speed-density distribution trend part meets loading curve, partially meets unloading
When curve, show that strata pressure Forming Mechanism is that nonequilibrium compaction effect and fluid expansion act on two kinds of mechanism；
Step 3: establishing the functional relation of mud stone density and speed under the conditions of different abnormal pressure Forming Mechanisms,
It is the stratum of nonequilibrium compaction effect, fitting for pressure initiation mechanism using abnormal highpressured mudstone speed piecewise fitting
Function uses Gardner formula.It is the stratum of fluid expansion effect for pressure initiation mechanism, fitting function uses, ρ 0 in formula,
V0, A and B are fitting parameter.
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| CN201910820607.7A CN110529104A (en) | 2019-08-29 | 2019-08-29 | A kind of improved abnormal highpressured mudstone velocity fitting method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509111A (en) * | 2017-09-15 | 2019-03-22 | 中国石油化工股份有限公司 | The prediction technique and system of prospect pit strata pressure |
| CN110069751A (en) * | 2019-05-07 | 2019-07-30 | 中国海洋石油集团有限公司 | A kind of non-undercompacted formation pore pressure prediction method |
-
2019
- 2019-08-29 CN CN201910820607.7A patent/CN110529104A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509111A (en) * | 2017-09-15 | 2019-03-22 | 中国石油化工股份有限公司 | The prediction technique and system of prospect pit strata pressure |
| CN110069751A (en) * | 2019-05-07 | 2019-07-30 | 中国海洋石油集团有限公司 | A kind of non-undercompacted formation pore pressure prediction method |
Non-Patent Citations (2)
| Title |
|---|
| 刘桃等: "欠压实与流体膨胀成因超压的定量评价", 《石油学报》 * |
| 樊洪海: "利用声速检测欠压实泥岩异常高压的简易方法与应用", 《石油钻探技术》 * |
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Application publication date: 20191203 |