CN109408837A - A method of correction geosteering model - Google Patents
A method of correction geosteering model Download PDFInfo
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- CN109408837A CN109408837A CN201710701286.XA CN201710701286A CN109408837A CN 109408837 A CN109408837 A CN 109408837A CN 201710701286 A CN201710701286 A CN 201710701286A CN 109408837 A CN109408837 A CN 109408837A
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
Abstract
A method of correction geosteering model comprising: Step 1: generating the initial guided modes of target well according to the two-dimension earthquake section of target well；Step 2: obtaining the prediction vertical depth data of actual measurement the vertical depth data and reference lamina of the reference lamina of target well in initial guided modes, real time correction coefficient is determined according to the actual measurement vertical depth data of reference lamina and prediction vertical depth data；Step 3: being corrected according to real time correction coefficient to initial guided modes, the amendment guided modes of target well are generated.Compared to existing method, this method can quickly and efficiently realize the check and correction of earthquake model, so that related data is provided for geosteering engineer, to guarantee that well track is walked in oil gas section to the maximum extent.
Description
Technical field
The present invention relates to oil and gas developments and exploration engineering field, specifically, being related to a kind of correction geosteering model
Method.
Background technique
It is increasingly depleted with petroleum resources, in order to improve the effect of oil gas drilling exploitation, save capital investment, current
Oil-gas exploration and development often uses horizontal well development mode.At present in horizontal drilling construction, the control of wellbore trace is wanted
Ask higher, especially after entering reservoir, therefore, to assure that track is walked in layer, and geosteering has obtained extensively therewith
Application.
Geosteering is a kind of well track to be maintained at storage according to well logging (LWD) and measurement while drilling (MWD) result
Relatively mature technology in layer.But since the preceding spy ability of LWD/MWD is limited and hardly has a lateral resolution capability,
The technology has a very high requirement to the foundation of initial guided modes, especially tomography is more, bed boundary is more complicated
Under reservoir conditions.For effective carrying out horizontal well drilling, needs sufficiently application and play transverse direction high score possessed by seismic data
Resolution feature carries out seismic-guided service for horizontal well.
There is no go during wide participation guiding for seismic technology during horizontal well drilling at present.Existing earthquake is led
To the main processing again using drilling earthquake well logging progress seismic data and inverting and then update oil reservoir target location size, shape
State optimizes wellbore trace in advance.But since drilling earthquake well logging and earthquake weight treatment process are extremely complex, need multidisciplinary agglomerate
Team cooperates, and cost is high and speed is slower, often can not meet the actual needs of guiding work.
Summary of the invention
To solve the above problems, the present invention provides a kind of methods for correcting geosteering model, which comprises
Step 1: generating the initial guided modes of the target well according to the two-dimension earthquake section of target well；
Step 2: obtaining the actual measurement vertical depth data of the reference lamina of the target well and the reference lamina is initially led described
Prediction vertical depth data into model determine real time correction according to the actual measurement vertical depth data of the reference lamina and prediction vertical depth data
Coefficient；
Step 3: being corrected according to the real time correction coefficient to the initial guided modes, the target well is generated
Amendment guided modes.
According to one embodiment of present invention, the step 1 includes:
Step a, the 3-d seismic data set of the target well is obtained；
Step b, two dimension is extracted from the 3-d seismic data set according to the well track design data of the target well
Seismic profile；
Step c, the initial guided modes of the target well are generated according to the geological analysis result of the two-dimension earthquake section.
According to one embodiment of present invention, in the step 2, calculate the reference lamina actual measurement vertical depth data and
The difference for predicting vertical depth data, judges whether the difference is greater than preset data deviation threshold, if it is greater, then according to the mark
The actual measurement vertical depth data and prediction vertical depth data of will layer determine real time correction coefficient.
According to one embodiment of present invention, in the step 2, the real time correction system is calculated according to following expression
Number:
Wherein, δ indicates that real time correction coefficient, abs indicate that absolute value calculates function,WithRespectively indicate reference lamina
Actual measurement vertical depth data and prediction vertical depth data, ZstarIndicate datum depth.
According to one embodiment of present invention, in the step 3, using the real time correction coefficient to the target
The amplitude of each sampled point is corrected in the two-dimension earthquake section of well, and generates the mesh according to the two-dimension earthquake section after correction
Mark the amendment guided modes of well.
According to one embodiment of present invention, the step 3 includes:
Single track depth correction is carried out to each sampled point in current seismic road using the real time correction coefficient, is obtained each
The Corrected Depth data of a sampled point；
Respective amplitude data is corrected according to the Corrected Depth data of each sampled point, obtains each sampling
The amendment amplitude data of point generates the two-dimension earthquake section after correction according to the amendment amplitude data of each sampled point.
According to one embodiment of present invention, single track depth correction is carried out according to following expression:
Di=dstar+(di-dstar) * δ, i=0 ..., n
Wherein, diAnd DiRespectively indicate the depth data in current seismic road before the correction of the i-th sampled point and the depth after correction
Degree evidence, dstarIndicate correction initial depth, δ indicates real time correction coefficient.
According to one embodiment of present invention, the amendment amplitude data of sampled point is calculated according to following expression:
Wherein, AjIndicate the amendment amplitude data of j-th of sampled point in current seismic road, djAnd dj+1Respectively indicate current position
Shake the depth data in road before the amendment of+1 sampled point of j-th of sampled point and jth, DjIt indicates to adopt for j-th in current seismic road
Depth data (i.e. Corrected Depth data) after the correction of sampling point, ajAnd aj+1Respectively indicate j-th of sampled point in current seismic road
The amplitude data before correction with+1 sampled point of jth.
Method provided by the present invention can rapidly correct seismic profile using well logging data, and then in real time more
New geosteering model.Compared to existing method, this method can quickly and efficiently realize that the correction of earthquake model (such as can
Original stratigraphic model is corrected with excessively interior at 1 minute), so that related data is provided for geosteering engineer, to protect
Card well track is walked in oil gas section to the maximum extent.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is required attached drawing in technical description to do simple introduction:
Fig. 1 is the implementation process schematic diagram of geosteering model bearing calibration according to an embodiment of the invention；
Fig. 2 is the two-dimension earthquake diagrammatic cross-section of target well according to an embodiment of the invention；
Fig. 3 is depth adjustment schematic diagram according to an embodiment of the invention；
Fig. 4 is according to an embodiment of the invention to the signal of initial guided modes corrected specific implementation flow
Figure；
Fig. 5 is sampled point depth check and correction schematic diagram according to an embodiment of the invention；
Fig. 6 is the two-dimension earthquake diagrammatic cross-section after the correction of target well according to an embodiment of the invention.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching technical effect can fully understand and implement.It needs to illustrate
As long as not constituting conflict, each feature in each embodiment and each embodiment in the present invention can be combined with each other,
It is within the scope of the present invention to be formed by technical solution.
Meanwhile in the following description, for illustrative purposes and numerous specific details are set forth, to provide to of the invention real
Apply the thorough understanding of example.It will be apparent, however, to one skilled in the art, that the present invention can not have to tool here
Body details or described ad hoc fashion are implemented.
In addition, step shown in the flowchart of the accompanying drawings can be in the department of computer science of such as a group of computer-executable instructions
It is executed in system, although also, logical order is shown in flow charts, and it in some cases, can be to be different from herein
Sequence execute shown or described step.
For the problems of in the prior art, the present invention provides a kind of correction sides of new geosteering model
Method, this method can fast and effeciently proofread seismic profile, and then real-time update guided modes.Wherein, Fig. 1 shows this implementation
The implementation process schematic diagram of this method in example.
As shown in Figure 1, geosteering model bearing calibration provided by the present embodiment first can basis in step s101
The two-dimension earthquake section of target well generates the initial guided modes of target well.Specifically, in the present embodiment, this method is in building mesh
During the initial guided modes for marking well, the 3-d seismic data set of target well can be obtained first, that is, obtains the well of target well
Week treated 3-d seismic data set, then come further according to the well track to be drilled design of target well from 3-d seismic data set
In extract the two-dimension earthquake section of target well, such as two-dimension earthquake diagrammatic cross-section as shown in Figure 2 is obtained, so also with regard to phase
When in obtaining the array of n column m row.Wherein, n indicates that the total sampling number of single track, m indicate total road number.This method is according to two-dimension earthquake
The geological analysis result of section can also construct to obtain the subsurface model of target well, to obtain initial guided modes.
Certainly, in other embodiments of the invention, this method can also obtain target well using other rational methods
Initial guided modes, the invention is not limited thereto.
As shown in Figure 1, this method can obtain the actual measurement vertical depth of the reference lamina of target well in step s 102 in the present embodiment
The prediction vertical depth data of data and the reference lamina in initial guided modes, then again in step s 103 according to the reference lamina
Actual measurement vertical depth data and prediction vertical depth data determine the real time correction coefficient of the target well.
Specifically, in the present embodiment, this method preferably obtains the true vertical depth of reference lamina by well logging explanation
(i.e. actual measurement vertical depth data).After the actual measurement vertical depth data that obtain reference lamina and prediction vertical depth data, this method preferably can be into
The actual measurement vertical depth data of one step calculation flag layer and the difference for predicting vertical depth data, and judge whether the difference is greater than preset data
Deviation threshold.Wherein, if the difference of actual measurement vertical depth data and prediction vertical depth data is greater than preset data deviation threshold, then
Indicate reference lamina default vertical depth data and its survey there are relatively large deviation between vertical depth data, initial guided modes are not quasi- enough
Really, it therefore also just needs to be corrected initial guided modes at this time, this method also will be according to the actual measurement vertical depth number of reference lamina
According to the real time correction coefficient for determining target well with prediction vertical depth data.
In the present embodiment, this method, preferably will be in initial guided modes in the real time correction coefficient for determining target well
Reference lamina layer depth be set as depth check and correction origin, by the real depth of the reference lamina be set as depth check and correction target
Point.
Specifically, this method calculates the real time correction coefficient of target well advantageously according to following expression:
Wherein, δ indicates that real time correction coefficient, abs indicate that absolute value calculates function,WithRespectively indicate reference lamina
Actual measurement vertical depth data and prediction vertical depth data, ZstarIndicate datum depth.
As shown in figure 3, datum level is set as the shallower horizontal plane of a depth in the present embodiment, when the actual measurement of reference lamina is hung down
Deep dataWith prediction vertical depth dataThere are when relatively large deviation, this method can be based on said reference face depth ZstarCome
Prediction vertical depth is corrected.
It should be pointed out that in different embodiments of the invention, datum depth ZstarIt can match according to actual needs
It is set to different reasonable values, the present invention is not to datum depth ZstarSpecific value be defined.
Again as shown in Figure 1, after obtaining the real time correction coefficient δ of target well, this method can in step S104 basis
Above-mentioned real time correction coefficient δ is corrected the initial guided modes of target well, to obtain the amendment guiding module of target well
Type.
In the present embodiment, this method preferably carrys out the two-dimension earthquake section to target well first with real time correction coefficient δ
In the amplitude of each sampled point be corrected, and the amendment guided modes of target well are generated according to the two-dimension earthquake section after correction.
Specifically, as shown in figure 4, in the present embodiment, after obtaining the real time correction coefficient δ of target well, this method is preferred
Ground is based on content shown in fig. 5 in step S401, using above-mentioned real time correction coefficient δ and correction initial depth to current position
The each sampled point shaken in road carries out single track depth correction, to obtain the depth in current seismic road after the correction of each sampled point
Degree evidence.
In the present embodiment, this method calculates the school of each sampled point in current seismic road advantageously according to following expression
Depth data after just:
Di=dstar+(di-dstar) * δ, i=0 ..., n (2)
Wherein, diAnd DiRespectively indicate the depth data in current seismic road before the correction of the i-th sampled point and the depth after correction
Degree evidence, dstarIndicate correction initial depth, δ indicates real time correction coefficient.
After depth data in obtaining current seismic road after the correction of each sampled point, this method can be in step S402
Respective amplitude data is corrected according to the depth data after the correction of sampled point each in current seismic road, to obtain
The amendment amplitude data of each sampled point in current seismic road.
Specifically, in the present embodiment, this method calculates each in current seismic road adopt advantageously according to following expression
The amendment amplitude data of sampling point:
Wherein, AjIndicate the amendment amplitude data of j-th of sampled point in current seismic road, djAnd dj+1Respectively indicate current position
Shake the depth data in road before the amendment of+1 sampled point of j-th of sampled point and jth, DjIt indicates to adopt for j-th in current seismic road
Depth data (i.e. Corrected Depth data) after the correction of sampling point, ajAnd aj+1Respectively indicate j-th of sampled point in current seismic road
The amplitude data before correction with+1 sampled point of jth.
Based on the above principles, in the available two-dimension earthquake section of this method in each seismic channel each sampled point amendment
Amplitude data, subsequent this method can generate in step S403 according to the amendment amplitude data of sampled point each in each seismic channel
Two-dimension earthquake section after correction, and the amendment of target well is generated according to the two-dimension earthquake section after correction in step s 404
Guided modes.
In the present embodiment, this method can update brill based on the amendment amplitude data of each sampled point in step s 404
Large-scale tectonic model before head, and then realize the amendment to the geosteering model of target well, it so also can be by right
The newest understanding of front construction is monitored well track and adjusts, and is worn to the maximum extent in oil gas section with controlling well track
Row.
As can be seen that method provided by the present invention can be using well logging data come rapidly school from foregoing description
To seismic profile, and then real-time update geosteering model.Compared to existing method, this method can be realized quickly and efficiently
The check and correction (such as excessively interior at 1 minute can proofread original stratigraphic model) of earthquake model, to be geosteering work
Cheng Shi provides related data, to guarantee that well track is walked in oil gas section to the maximum extent.
It should be understood that disclosed embodiment of this invention is not limited to specific structure disclosed herein or processing step
Suddenly, the equivalent substitute for these features that those of ordinary skill in the related art are understood should be extended to.It should also be understood that
It is that term as used herein is used only for the purpose of describing specific embodiments, and is not intended to limit.
" one embodiment " or " embodiment " mentioned in specification means the special characteristic described in conjunction with the embodiments, structure
Or characteristic is included at least one embodiment of the present invention.Therefore, the phrase " reality that specification various places throughout occurs
Apply example " or " embodiment " the same embodiment might not be referred both to.
Although above-mentioned example is used to illustrate principle of the present invention in one or more application, for the technology of this field
For personnel, without departing from the principles and ideas of the present invention, hence it is evident that can in form, the details of usage and implementation
It is upper that various modifications may be made and does not have to make the creative labor.Therefore, the present invention is defined by the appended claims.
Claims (8)
1. a method of correction geosteering model, which is characterized in that the described method includes:
Step 1: generating the initial guided modes of the target well according to the two-dimension earthquake section of target well；
Step 2: the actual measurement vertical depth data for obtaining the reference lamina of the target well and the reference lamina are in the initial guiding module
Prediction vertical depth data in type determine real time correction system according to the actual measurement vertical depth data of the reference lamina and prediction vertical depth data
Number；
Step 3: being corrected according to the real time correction coefficient to the initial guided modes, repairing for the target well is generated
Positive guided modes.
2. the method as described in claim 1, which is characterized in that the step 1 includes:
Step a, the 3-d seismic data set of the target well is obtained；
Step b, two-dimension earthquake is extracted from the 3-d seismic data set according to the well track design data of the target well
Section；
Step c, the initial guided modes of the target well are generated according to the geological analysis result of the two-dimension earthquake section.
3. method according to claim 1 or 2, which is characterized in that in the step 2, calculate the actual measurement of the reference lamina
The difference of vertical depth data and prediction vertical depth data, judges whether the difference is greater than preset data deviation threshold, if it is greater, then
Real time correction coefficient is determined according to the actual measurement vertical depth data of the reference lamina and prediction vertical depth data.
4. method according to any one of claims 1 to 3, which is characterized in that in the step 2, according to following expression
Calculate the real time correction coefficient:
Wherein, δ indicates that real time correction coefficient, abs indicate that absolute value calculates function,WithRespectively indicate the actual measurement of reference lamina
Vertical depth data and prediction vertical depth data, ZstarIndicate datum depth.
5. method as described in any one of claims 1 to 4, which is characterized in that in the step 3, using it is described in real time
Correction coefficient is corrected the amplitude of each sampled point in the two-dimension earthquake section of the target well, and according to the two dimension after correction
Seismic profile generates the amendment guided modes of the target well.
6. method as claimed in claim 5, which is characterized in that the step 3 includes:
Single track depth correction is carried out to each sampled point in current seismic road using the real time correction coefficient, obtains each adopt
The Corrected Depth data of sampling point；
Respective amplitude data is corrected according to the Corrected Depth data of each sampled point, obtains each sampled point
Amplitude data is corrected, the two-dimension earthquake section after correction is generated according to the amendment amplitude data of each sampled point.
7. method as claimed in claim 6, which is characterized in that carry out single track depth correction according to following expression:
Di=dstar+(di-dstar) * δ, i=0 ..., n
Wherein, diAnd DiRespectively indicate the depth data in current seismic road before the correction of the i-th sampled point and the depth number after correction
According to dstarIndicate correction initial depth, δ indicates real time correction coefficient.
8. method according to claim 6 or 7, which is characterized in that calculate the amendment amplitude of sampled point according to following expression
Data:
Wherein, AjIndicate the amendment amplitude data of j-th of sampled point in current seismic road, djAnd dj+1Respectively indicate current seismic road
In+1 sampled point of j-th of sampled point and jth amendment before depth data, DjIndicate j-th of sampled point in current seismic road
Correction after depth data (i.e. Corrected Depth data), ajAnd aj+1Respectively indicate j-th of sampled point and in current seismic road
Amplitude data before the correction of j+1 sampled point.
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