CN106405646B - A kind of method for obtaining the group formation interval velocity of plateau containing gypsum-salt rock - Google Patents
A kind of method for obtaining the group formation interval velocity of plateau containing gypsum-salt rock Download PDFInfo
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- CN106405646B CN106405646B CN201610791037.XA CN201610791037A CN106405646B CN 106405646 B CN106405646 B CN 106405646B CN 201610791037 A CN201610791037 A CN 201610791037A CN 106405646 B CN106405646 B CN 106405646B
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- 239000011435 rock Substances 0.000 title claims abstract description 56
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000006071 cream Substances 0.000 claims description 47
- 150000003839 salts Chemical class 0.000 claims description 45
- 238000007619 statistical method Methods 0.000 claims description 11
- 208000035126 Facies Diseases 0.000 claims description 5
- 230000001629 suppression Effects 0.000 claims description 5
- 229910052602 gypsum Inorganic materials 0.000 description 5
- 239000010440 gypsum Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/30—Analysis
- G01V1/303—Analysis for determining velocity profiles or travel times
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/62—Physical property of subsurface
- G01V2210/622—Velocity, density or impedance
- G01V2210/6222—Velocity; travel time
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Acoustics & Sound (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The present invention provides a kind of methods for obtaining the group formation interval velocity of plateau containing gypsum-salt rock.The method includes：The interval velocity on the group of plateau containing gypsum-salt rock stratum, formula 1 are according to acquiring formula 1：V=(Δ T × VBase+(T‑ΔT)×VCream)/T, wherein, fiducial time thickness when Δ T is no gypsum-salt bed, VBaseBenchmark interval velocity during for no gypsum-salt bed, VCreamFor the average speed containing gypsum-salt bed, T is plateau group time thickness.The method of the present invention can determine the interval velocity on the group of plateau containing gypsum-salt rock stratum with seismic data and Geo-statistic Method.
Description
Technical field
The present invention relates to seismic datas to analyze and process technical field, more particularly, be related to it is a kind of with seismic data and
Geo-statistic Method determines the group formation interval velocity method of plateau containing gypsum-salt rock.
Background technology
Typically for the earth formation containing gypseous-salt rock, due to its own design feature, it is difficult effectively accurate obtain to cause
The set formation interval velocity, so as to be difficult to accurately determine that gypsum-salt rock underlies construction, this surveys the group earth formation of plateau containing gypsum-salt bed
Spy also results in very big difficulty.
For example, in recent years, in eastern Sichuan Basin high-dip structure exploration process, particularly deep layer Lower Paleozoic strata-Sinian system is oily
During gas exploration, due to Lower Paleozoic strata Cambrian system plateau group for a set of thickness and velocity variations quickly containing gypsum and salt rock formation,
Due to the presence of the set gypsum and salt rock formation, it is difficult to effectively accurately obtain the set formation interval velocity, the gypsum-salt rock construction that underlies is set to be difficult
It implements, it is difficult to break through in turn result in eastern Sichuan Basin Lower Paleozoic strata-Sinian system exploration.
Invention content
It is an object of the invention to solve at least one in deficiencies of the prior art.
For example, the purpose of the present invention is to provide a kind of interval velocities that can be suitable for asking for plateau group gypsum and salt rock formation
Method.
The present invention provides it is a kind of obtain the group formation interval velocity of plateau containing gypsum-salt rock method, the method includes：According to
Formula 1 acquires the interval velocity on the group of plateau containing the gypsum-salt rock stratum, wherein, formula 1 is：V=(Δ T × VBase+(T-ΔT)×VCream)/T,
Wherein, fiducial time thickness when Δ T is no gypsum-salt bed, VBaseBenchmark interval velocity during for no gypsum-salt bed, VCreamFor containing gypsum-salt bed
Average speed, T are plateau group time thickness, and the time thickness on the group of plateau containing gypsum-salt rock stratum is picked up using seismic data
It takes, using it as plateau group time thickness T；Choose in plateau group subterranean formation zone basement rock speed stability in the top 3 mouthfuls with
Upper statistical analysis well, during using the arithmetic average of the basement rock speed of described 3 mouthfuls or more statistical analysis wells as no gypsum-salt bed
Benchmark interval velocity VBase；3 mouthfuls or more outside plateau group subterranean formation zone or area are chosen without cream salt well, with described 3 mouthfuls or more without cream salt
The weighted average of the fiducial time thickness of well is as fiducial time thickness deltat T；The average speed of the section of salt containing cream is obtained according to formula 2
VCream, formula 2 is：VCream=VBase× (1- λ), wherein, λ is that the speed of the section of salt containing cream declines weighting coefficient, and λ to 3 mouthfuls or more by containing cream
The average speed suppression ratio of the section of salt containing cream of salt well is weighted average obtain.
In one exemplary embodiment of the present invention, the quantity of the statistical analysis well can be 5 mouthfuls or more.
In one exemplary embodiment of the present invention, the weighting of described 3 mouthfuls or more the fiducial time thickness without cream salt well
The weighting scheme of average value can be：Described 3 mouthfuls or more are without being located at the weights of well in plateau group subterranean formation zone in cream salt well
1.8~2.2 times of the weight of well outside area, preferably 2 times.
In one exemplary embodiment of the present invention, the average speed of the section of the salt containing cream to 3 mouthfuls or more the salt wells containing cream
Degree suppression ratio, which is weighted average weighting scheme, to be：It is comprehensive for each well in described 3 mouthfuls or more salt wells containing cream
Consider the distance between center of the well and plateau group subterranean formation zone, well reliability, whether punch plateau, the factor of seismic facies
In one or more weights because usually determining this mouthful of well.
It, can be with the basement rock speed of described 3 mouthfuls or more statistical analysis wells in one exemplary embodiment of the present invention
Arithmetic average ten rounding end values or ten end values that round up as no gypsum-salt bed when benchmark interval velocity VBase。
It, can be according to the V in formula 2 in one exemplary embodiment of the present inventionBaseTen rounding end values of × (1- λ)
Or ten average speed Vs of the end value as the section of salt containing cream that round upCream。
Compared with prior art, method of the invention can determine to contain gypsum-salt rock with seismic data and Geo-statistic Method
The interval velocity on plateau group stratum.
Description of the drawings
Fig. 1 shows the application schematic diagram of the method according to the present invention for obtaining the group formation interval velocity of plateau containing gypsum-salt rock.
Specific embodiment
Hereinafter, by with reference to exemplary embodiment with carrying out acquisition plateau containing the gypsum-salt rock group that the present invention will be described in detail layer by layer
The method of speed.
Generally speaking, the method for acquisition plateau containing gypsum-salt rock group formation interval velocity of the invention is by using seismic data standard
The really top of pickup gypsum and salt rock formation, bottom interface, then detach bedrock thickness and thickness containing gypsum-salt rock using geostatistics method,
Ask for basement rock speed and speed containing gypsum-salt rock respectively again, with reference to average weighted mode, the layer speed on final determining plateau group stratum
Degree.
In one exemplary embodiment of the present invention, the method for obtaining the group formation interval velocity of plateau containing gypsum-salt rock can basis
Following formula 1 acquires the interval velocity on the group of plateau containing the gypsum-salt rock stratum.
Formula 1 is：V=(Δ T × VBase+(T-ΔT)×VCream)/T。
Wherein, Δ T is the fiducial time thickness in the case of no gypsum-salt bed, VBaseFor the datum layer speed in the case of no gypsum-salt bed
Degree, VCreamFor the average speed containing gypsum-salt bed, T is plateau group time thickness.
Specifically, the fiducial time thickness deltat T in the case of no gypsum-salt bed, without the benchmark interval velocity in the case of gypsum-salt bed
VBase, gypsum-salt bed average speed VCreamAnd following manner may be used in the determining method of plateau group time thickness T：
(1) the time thickness on the group of plateau containing gypsum-salt rock stratum is picked up using seismic data, using it as plateau group
Time thickness T.
(2) 3 mouthfuls or more the statistical analysis wells that basement rock speed stability is in the top in plateau group subterranean formation zone are chosen, and
Benchmark interval velocity V during using the arithmetic average of the basement rock speed of this 3 mouthfuls or more statistical analysis wells as no gypsum-salt bedBase.This
In, scene calculates for convenience, and ten that the arithmetic average of the basement rock speed of 3 mouthfuls or more statistical analysis wells can also be used take
Whole end value or ten end values that round up, benchmark interval velocity V during as no gypsum-salt bedBase。
Choose 3 mouthfuls or more (can be described as outside area, for example, adjacent area) outside plateau group subterranean formation zone (can be described as work area) or work area
Without cream salt well, using the weighted average of this 3 mouthfuls or more the fiducial time thickness without cream salt well as fiducial time thickness deltat T.
When being weighted, this 3 mouthfuls or more the weights without the well being located in cream salt well in plateau group subterranean formation zone can be outside area
1.8~2.2 times of the weight of well, for example, can be 2 times.
(3) the average speed V of the section of salt containing cream can be obtained according to formula 2Cream。
Formula 2 is：VCream=VBase×(1-λ)。
Wherein, λ is that the speed of the section of salt containing cream declines weighting coefficient, and λ passes through the section of the salt containing cream to 3 mouthfuls or more the salt wells containing cream
Average speed suppression ratio is weighted average obtain.In specific weighting, for every mouthful in this 3 mouthfuls or more salt wells containing cream
Well, consider the distance between center (i.e. work area center) of the well and plateau group subterranean formation zone, this mouthful of well reliability,
Whether one or more weight because usually determine this mouthful well in the factors such as plateau, seismic facies is punched.Each factor is to weight
Percentage contribution can be determined by those skilled in the art.In general, the factor considered is more, accuracy is higher.
In addition, scene calculates for convenience, the V in formula 2 can also be usedBaseTen rounding end values or ten of × (1- λ)
Position rounds up average speed V of the end value as the section of salt containing creamCream。
In the method for the invention, the total quantity of the well for statistical analysis in plateau group subterranean formation zone is more, then has
The group formation interval velocity accuracy of plateau containing gypsum-salt rock obtained conducive to the method for further improving the present invention.Similarly, it is used for
The quantity without cream salt well for asking for fiducial time thickness deltat T is more, for asking for the salt well containing cream of speed decline weighting coefficient λ
Quantity is more, and the group formation interval velocity of plateau containing gypsum-salt rock that the method for being conducive to further improve the present invention is obtained is accurate
Property.
Below in conjunction with the accompanying drawings and specific example is described in further detail exemplary embodiment of the present invention.
Fig. 1 shows the application schematic diagram of the method according to the present invention for obtaining the group formation interval velocity of plateau containing gypsum-salt rock.
In the group earth formation of plateau containing gypsum-salt rock of Fig. 1, upper strata be gypsum-salt bed (also referred to as containing layer of paste), lower floor for no gypsum-salt bed (also
It can be described as horizon d).
(1) after using seismic data to plateau group stratum time thickness accurately pickup, it is most important that formation interval velocity
Determine.
Formation interval velocity is calculated by following equation：V=(Δ T × VBase+(T-ΔT)×VCream)/T
In formula：Fiducial time thickness when Δ T is no gypsum-salt bed；
VBaseBenchmark interval velocity during for no gypsum-salt bed；
VCreamFor the gypsum-salt bed speed thickened；
T is plateau group time thickness；
(2) there are 4 variables in formula, wherein T can be picked up by seismic data, also need to determine Δ T, VBase、VCreamParameter.
1. sharing 5 mouthfuls of well plateau group basement rock speed in region relatively to stablize, this 5 mouthfuls of wells are respectively：GT2 wells, WK1 wells, Z3 wells,
TH1 wells, L1 wells.GT2 wells, WK1 wells, Z3 wells, TH1 wells, L1 wells basement rock speed be followed successively by：6340m/s、6550m/s、6150m/
s、6150m/s、6480m/s.6300m/s is set as by basement rock speed after arithmetic average.The data are after taking arithmetic average
(6334m/s), then round up to obtain (6300m/s) in tens rounding or at ten.
2. 3 mouthfuls of wells (GT2 wells (in work area), Z4 wells (in work area), MS1 wells (outside area)) time thickness difference of no cream salt
It is：32.2ms, 51.4ms, 50ms, after weighted average, Δ T=(32.2*2+51.4*2+50*1)/5=43ms.Here,
Weight is set as 2 in area, and weight proportion is set as 1 outside area.Δ T is set as 43ms.
3. due to the difference of the ratio of salt containing cream, Z3 wells, L1 wells, WK1 wells, the TH1 wells section average speed of salt containing cream decline respectively
22%th, 10%, 10%, 17% (GT2 wells are free of gypsum-salt rock).Consider distance, well reliability, whether punch plateau three because
Speed decline weighting coefficient is set as by element：
22% × 5/17+10% × 4/17+10% × 5/17+17% × 3/17=16.76%
And then it can will contain cream salt section average speed V cream and be set as 5200m/s.It is fallen to containing the speed after cream：6300×(1-
17%)=5229m/s.5200m/s is rounding or to round up to obtain on tens by 5229m/s.
For above-mentioned three factor, detailed description are as follows：
A, distance, i.e. certain mouthful of fixed well and the distance at work area center, distance are nearer, it is believed that the subsurface picture of well reaction with
Similar possibility is bigger in work area.B, the reliability of well, that is, the well curve reliability measured, such as have one in well curve
Kind is the curve of hole diameter, and what it was reacted is the size of drilling, if suddenly become larger, is likely to show that the well section collapses, that
The shallower log of some patch boreholes wall, investigation depth is easily impacted, such as density curve etc.；Also it is exactly the year measured
Generation, instrument.C, whether plateau is punched.There are WK1, TH1 well not punch plateau group in area, only part is bent in interval of interest
Line, then cannot completely react the formation information of the interval of interest.
In addition, in addition to above three factor, it is also contemplated that the factor of seismic facies, for example, sedimentary facies reflection is that stratum exists
Environment during deposition.
In the present example embodiment, the distance weights of well are 0-2；The reliability weighted value of well is 0-2；Whether punch
Weighted value is 0-1.For example, the Z3 wells in this work area, the opposite work area central point of distance is nearer, and well curve is reliable, punches plateau group, that
Its weights are 2+2+1=5, and other wells are followed successively by 4,5,3.Therefore, the weights of Z3 wells are 5/ (5+4+5+3)=5/17.So
And each factor is without being limited thereto to the contribution range of weight in the present invention, those of ordinary skill in the art can be empirically determined.
4. plateau group interval velocity：V=(0.043 × 6300+ (T-0.043) × 5200)/T.
Wherein, T is the plateau group time thickness in somewhere.
It is 6178 to calculate Z3 wells speed according to the formulary regression, and practical is 6050, relative error rate 2.1%.
In conclusion the method for the present invention can ask for the interval velocity on the group of plateau containing gypsum-salt rock stratum；And accuracy compared with
It is good.In addition, in western part of China and external oil-gas exploration, gypsum-salt rock is good cap rock, but due to the presence of gypsum-salt rock
Geology illusion is be easy to cause, and the method for the present invention can be effectively applied to these containing gypsum and salt rock formation, have quite extensively
Application prospect.
Although attached drawing is had been combined above and exemplary embodiment describes the present invention, those of ordinary skill in the art
It will be apparent to the skilled artisan that in the case where not departing from spirit and scope by the claims, above-described embodiment can be carry out various modifications.
Claims (6)
- A kind of 1. method for obtaining the group formation interval velocity of plateau containing gypsum-salt rock, which is characterized in that the method includes：According to formula 1 The interval velocity V on the group of plateau containing the gypsum-salt rock stratum is acquired, wherein,Formula 1 is：V=(Δ T × VBase+(T-ΔT)×VCream)/T,Wherein, fiducial time thickness when Δ T is no gypsum-salt bed, VBaseBenchmark interval velocity during for no gypsum-salt bed, VCreamTo contain cream salt The average speed of section, T are plateau group time thickness,The time thickness on the group of plateau containing gypsum-salt rock stratum is picked up using seismic data, using pickup gained as plateau Group time thickness T；3 mouthfuls or more the statistical analysis wells that basement rock speed stability is in the top in plateau group subterranean formation zone are chosen, with described 3 mouthfuls Benchmark interval velocity V when the arithmetic average of the basement rock speed of more than statistical analysis well is as no gypsum-salt bedBase；3 mouthfuls or more outside plateau group subterranean formation zone or area are chosen without cream salt well, with described 3 mouthfuls or more the fiducial times without cream salt well Fiducial time thickness deltat T when the weighted average of thickness is as no gypsum-salt bed；The average speed V of the section of salt containing cream is obtained according to formula 2Cream,Formula 2 is：VCream=VBase× (1- λ),Wherein, λ is that the speed of the section of salt containing cream declines weighting coefficient, and λ is averaged by the section of the salt containing cream to 3 mouthfuls or more the salt wells containing cream Speed suppression ratio is weighted average obtain.
- 2. the method according to claim 1 for obtaining the group formation interval velocity of plateau containing gypsum-salt rock, which is characterized in that the system The quantity for counting analysis well is 5 mouthfuls or more.
- 3. the method according to claim 1 for obtaining the group formation interval velocity of plateau containing gypsum-salt rock, which is characterized in that described 3 Mouthful or more the weighting scheme of the weighted average of the fiducial time thickness without cream salt well be：Described 3 mouthfuls or more without position in cream salt well In 1.8~2.2 times of the weight that the weight of the well in plateau group subterranean formation zone is the well outside area.
- 4. the method according to claim 1 for obtaining the group formation interval velocity of plateau containing gypsum-salt rock, which is characterized in that described right The average speed suppression ratio of the section of the salt containing cream of 3 mouthfuls or more the salt wells containing cream is weighted average weighting scheme and is：Consider 3 mouthfuls Above the distance between center of each well and plateau group subterranean formation zone in salt well containing cream, well reliability, whether punch plateau, It is one or more in the factor of seismic facies, to determine the weight of each well.
- 5. the method according to claim 1 for obtaining the group formation interval velocity of plateau containing gypsum-salt rock, which is characterized in that with described The ten rounding end values or ten end values that round up of the arithmetic average of the basement rock speed of 3 mouthfuls or more statistical analysis wells Benchmark interval velocity V during as no gypsum-salt bedBase。
- 6. the method according to claim 1 for obtaining the group formation interval velocity of plateau containing gypsum-salt rock, which is characterized in that according to formula V in 2BaseTen rounding end values of × (1- λ) or ten average speed Vs of the end value as the section of salt containing cream that round upCream。
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102918422A (en) * | 2010-03-31 | 2013-02-06 | 斯塔特伊石油公司 | Estimating interval velocities |
| CN102967882A (en) * | 2012-11-16 | 2013-03-13 | 中国石油集团川庆钻探工程有限公司地球物理勘探公司 | Method for building layer velocity model of stratum |
| CN105676283A (en) * | 2015-03-03 | 2016-06-15 | 西北大学 | Method for calculating seismic wave speed of stratum by using travel time of through seismic waves of inclined shaft |
| CN105842736A (en) * | 2016-05-27 | 2016-08-10 | 中国石油集团川庆钻探工程有限公司地球物理勘探公司 | Method for building stratum velocity model |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5197039A (en) * | 1988-03-29 | 1993-03-23 | Shell Oil Company | Methods for processing seismic data |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102918422A (en) * | 2010-03-31 | 2013-02-06 | 斯塔特伊石油公司 | Estimating interval velocities |
| CN102967882A (en) * | 2012-11-16 | 2013-03-13 | 中国石油集团川庆钻探工程有限公司地球物理勘探公司 | Method for building layer velocity model of stratum |
| CN105676283A (en) * | 2015-03-03 | 2016-06-15 | 西北大学 | Method for calculating seismic wave speed of stratum by using travel time of through seismic waves of inclined shaft |
| CN105842736A (en) * | 2016-05-27 | 2016-08-10 | 中国石油集团川庆钻探工程有限公司地球物理勘探公司 | Method for building stratum velocity model |
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