CN106842289B - A kind of ingrated seismic trace suitable for Application of Logging-constrained Inversion goes compaction treatment method - Google Patents
A kind of ingrated seismic trace suitable for Application of Logging-constrained Inversion goes compaction treatment method Download PDFInfo
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Abstract
The present invention provides a kind of well logging p-wave impedance curve suitable for Application of Logging-constrained Inversion and goes compaction treatment method, the well logging p-wave impedance compacting trend of each lithology is calculated and rejected including point lithology, and each lithologic log p-wave impedance baseline counted using log carries out well logging p-wave impedance baseline assignment to respective lithology, to obtain the well logging p-wave impedance curve of compaction treatment, and be applied in Application of Logging-constrained Inversion, carry out the reservoir p-wave impedance quantitative forecast in entire work area.The well logging p-wave impedance curve for being suitable for Application of Logging-constrained Inversion goes compaction treatment method that can reasonably amplify the p-wave impedance difference between reservoir and country rock, reduce reservoir and country rock and causing the multi-solution of inversion result because p-wave impedance value overlapping section is larger on original well logging p-wave impedance curve, enables the distribution situation of final p-wave impedance inversion result accurately predicting reservoir.
Description
Technical field
The present invention relates to geophysical exploration technical field of data processing, especially relate to a kind of suitable for Log-constrained
The well logging p-wave impedance of inverting goes compaction treatment method.
Background technique
Application of Logging-constrained Inversion is one of current reservoir prediction important method, and application range is relatively broad.Turbidite,
It played an important role in the lithology such as sand-conglomerate body and beach -bar sandstones, construction-lithologic reservoirs exploitation.Under ordinary meaning
Application of Logging-constrained Inversion it is obtained the result is that earthquake p-wave impedance invertomer, have specific physical significance, in reservoir prediction
In, by instructing the reservoir prediction in entire work area in conjunction with distribution characteristics of the reservoir on well logging p-wave impedance curve.But it is a large amount of
Practical application show the obtained p-wave impedance invertomer of Application of Logging-constrained Inversion in reservoir prediction occasionally there are relatively mostly
Xie Xing, being mainly shown as reservoir and country rock, there are biggish overlapping intervals on p-wave impedance distributed area, it is difficult to effectively distinguish.
It causes the basic reason of this phenomenon to be, on original well logging p-wave impedance curve, is inherently deposited between reservoir and country rock
In biggish overlapping interval, thus under Log-constrained, obtained P wave Impedance Inversion body also certainly exists this and asks
Topic.For this problem, existing solution is that the method for sound wave curve reconstruct is taken to amplify between reservoir and country rock
Speed difference, specific practice are that introducing natural gamma, resistivity, natural potential etc. are such to reservoir in original sound wave curve
These original logs are fitted to a new curve by Mathematical Fitting formula by the sensitive log of response again,
Referred to as " pseudo- sound wave " curve, then be multiplied with density curve, " pseudo- p-wave impedance " curve is obtained, to participate in final survey
In well constrained inversion.According to the analysis, this sound wave curve reconstructing method obtained " pseudo- sound wave " is although curve can amplify reservoir
Speed difference between country rock, but take the prediction result of the finally obtained p-wave impedance invertomer of this " pseudo- sound wave " curve
It is inaccurate, reason is that " pseudo- sound wave " curve for taking this reconstruct mode to obtain serious can influence final meter therefrom
Obtained reflection coefficient curve, this curve processing mode can substantially change the reflection coefficient sequence of well logging, cause itself and son
Matching when wave convolution between obtained synthetic traces and seismic traces is deteriorated and influences final inversion result.
Summary of the invention
Present invention aim to address the above technical problems, provide a kind of well logging longitudinal wave suitable for Application of Logging-constrained Inversion
Compaction treatment method is gone in impedance, by reasonably being handled the p-wave impedance curve of original well logging, to effectively amplify
P-wave impedance difference between reservoir and country rock, enables the distribution feelings of final p-wave impedance invertomer accurately predicting reservoir
Condition.
The purpose of the present invention is realized by the following technical solutions:
This well logging p-wave impedance for being suitable for Application of Logging-constrained Inversion goes the compaction treatment method to include:
Step 1, well logging p-wave impedance curve is corresponding with lithology curve, point lithology extracts the well logging longitudinal wave resistance of each lithology
Anti- curve；
Step 2, the non-depressed real component of p-wave impedance of each lithology is calculated；
Step 3, each non-depressed real component of lithology p-wave impedance being calculated in step 2 is rejected, is hindered with the longitudinal wave of each lithology
Anti- value subtracts the non-depressed real component of p-wave impedance of respective lithology, obtains rejecting each lithology longitudinal wave after the non-depressed real component of p-wave impedance
Impedance；
Step 4, the Fitting Calculation goes out to eliminate each lithology p-wave impedance of the non-depressed real component of p-wave impedance point lithology respectively
Compacting trend, and weeded out.Subtracted respectively using each lithology p-wave impedance for eliminating the non-depressed real component of p-wave impedance
The p-wave impedance compacting trend of lithology, each lithology p-wave impedance after obtaining compacting trend；
It step 5, will be obtained in each non-compacted Quantile Regression to step 4 of lithology p-wave impedance that be calculated in step 2
In each lithology p-wave impedance after removing compacting trend, thus obtain each lithology go compacting p-wave impedance；
Step 6, the p-wave impedance after each lithology obtained in step 5 to be gone to compacting trend carries out the vertical of respective lithology respectively
Wave impedance baseline assignment, each lithology p-wave impedance after obtaining baseline assignment；Step 7, by each lithology longitudinal wave after baseline assignment
Impedance merges, and obtains one and removes compacting trend treated well logging p-wave impedance curve, and participates in subsequent longitudinal wave resistance
During anti-reflective is drilled.
Above-mentioned technical proposal further illustrates:
In step 1, by the corresponding relationship between lithology curve and the p-wave impedance curve of well logging, by every kind of lithology
Well logging p-wave impedance individually extracts, so that the well logging group ingrated seismic trace of continuous type to be resolved into single rock of multiple discrete types
Property well logging p-wave impedance curve.
In step 2, the p-wave impedance value of each lithology can be significantly increased with the increase of buried depth, but shadow between different lithology
The factor for ringing p-wave impedance variation is not fully identical.By taking sand, mud stone as an example, what the variation of mud stone p-wave impedance was mainly compacted
It influencing, the influence of non-compacted factor is smaller, it can be neglected, and the variation of the p-wave impedance of sandstone is in addition to the shadow by compacting factor
Outside ringing, also influenced by the non-compacted factor containing fluidity, porosity etc., it is non-that this some effects factor is referred to as p-wave impedance
It is compacted component, the non-depressed real component of p-wave impedance can be simulated by petrophysics experiment room and is calculated.
In step 3, after the non-depressed real component of p-wave impedance that respective lithology is subtracted with the p-wave impedance value of each lithology, each rock
Property p-wave impedance value with buried depth variation influence factor only be left compacting factor.Reject the non-depressed real component of p-wave impedance
Purpose is for the subsequent p-wave impedance compacting trend that can more accurately calculate each lithology.In the non-depressed real component of p-wave impedance
Rejecting during because the non-depressed real component of the p-wave impedance of mud stone is smaller, can be ignored, but the lithology such as sandstone, limestone
The non-depressed real component of p-wave impedance need to reject.
In step 4, calculating is fitted to the compacting trend of each lithology p-wave impedance.The p-wave impedance compacting of mud stone becomes
Gesture directly can be fitted calculating by the p-wave impedance curve of mud stone, and the compacting of the p-wave impedance of the lithology such as sandstone, limestone becomes
Gesture only can just be fitted calculating after eliminating the non-depressed real component of p-wave impedance.Go out the vertical of each lithology in the Fitting Calculation
Wave impedance compacting trend and after being rejected, has just obtained removing each lithology p-wave impedance curve after compacting trend, need at this time
It is noted that mud stone only eliminates the p-wave impedance compacting trend of mud stone, and the lithology such as sandstone, limestone not only eliminate theirs
P-wave impedance compacting trend also eliminates their the non-depressed real component of p-wave impedance before this.
In steps of 5, it needs to be returned the non-depressed real component of the p-wave impedance of each lithology, which is because, mud stone
Removing compacting trend p-wave impedance is only to eliminate its p-wave impedance compacting trend, is corresponded, the lithology such as sandstone, limestone
It also can only be to eliminate their p-wave impedance compacting trend, thus sandstone, the limestone isolith for needing to be calculated in step 2
Property the non-depressed real component of p-wave impedance returned, each lithology obtained in this way go compacting p-wave impedance curve relative to respective
For the original p-wave impedance curve of lithology, the p-wave impedance compacting trend of respective lithology is only eliminated.
In steps of 5, each lithology handled goes compacting p-wave impedance to have the feature that each rock after processing
Property p-wave impedance codomain distribution more concentrate, and due to eliminating p-wave impedance compacting trend, same lithology it is vertical
Wave impedance shallow-layer, middle layer, deep layer all relatively.
In step 6, the well logging p-wave impedance baseline of each lithology is to choose to bury from original well logging p-wave impedance curve
Each lithology p-wave impedance average value come out in deep relatively shallower interval, because in the relatively shallower interval of buried depth,
The p-wave impedance of each lithology is relatively small by being compacted be influenced, and between each lithology, such as mud stone, sandstone, limestone lithology are shallow
Overlapping section is smaller in layer buried depth section, and there are biggish differences for p-wave impedance average value.
In step 6, in the relatively shallower interval of selection buried depth, following principle should be followed: the phase of preferred purpose series of strata
Preferable effect can be obtained if sedimentary facies belt variation is less to shallow-layer part, if sedimentary facies belt differs greatly, it is contemplated that
Take on purpose series of strata relatively shallow is layer by layer；Relatively shallow on purpose series of strata is preferential selection and mesh in selection layer by layer
Series of strata have similar deposition background series of strata.The above principle is followed to be conducive to by processing and finally obtained p-wave impedance is bent
Line reflection coefficient sequence calculated and the obtained synthetic seismogram road of wavelet convolution are best to having between original earthquake
Matching.
In step 7, each lithology p-wave impedance after baseline assignment is all the discrete longitudinal wave of single lithology in Depth Domain
Impedance value needs to merge, and merge after obtain be a decompaction influence well logging p-wave impedance curve, each lithology
Between p-wave impedance there is biggish difference, thus can obtain in subsequent Log-constrained p-wave impedance inverting preferable
Effect.
Well logging p-wave impedance curve suitable for Application of Logging-constrained Inversion of the invention goes compaction treatment method can be reasonably
Amplify the p-wave impedance difference between reservoir and country rock, reduces reservoir and country rock on original well logging p-wave impedance curve because vertical
Wave impedance value overlapping section is larger and causes the multi-solution of inversion result, enables final p-wave impedance inversion result accurate
The distribution situation of ground predicting reservoir.
Detailed description of the invention
Fig. 1 is the flow chart of specific embodiments of the present invention；
Fig. 2 is original p-wave impedance (A) curve graph for surveying well；
Fig. 3 is the probability density distribution figure for surveying the original p-wave impedance of well (A)；
Fig. 4 is sandstone p-wave impedance (I) curve and mud stone being stripped out from the actual measurement original p-wave impedance of well (A) point lithology
P-wave impedance (a) curve graph；
Fig. 5 is the non-compacted component map of sandstone p-wave impedance；
Fig. 6 is sandstone p-wave impedance (II) curve graph after eliminating the non-depressed real component of sandstone p-wave impedance；
Fig. 7 is sandstone p-wave impedance (II) and buried depth (vertical depth) crosses figure；
Fig. 8 is sandstone p-wave impedance (II) compacting trend the Fitting Calculation figure；
Fig. 9 is mud stone p-wave impedance (a) and buried depth (vertical depth) crosses figure；
Figure 10 is mud stone p-wave impedance (a) compacting trend the Fitting Calculation figure；
Figure 11 is that sandstone p-wave impedance (II) rejects sandstone p-wave impedance (III) song after sandstone p-wave impedance compacting trend
Line chart；
Figure 12 is that mud stone p-wave impedance (a) rejects mud stone p-wave impedance (b) curve after mud stone p-wave impedance compacting trend
Figure；
Figure 13 is by sandstone longitudinal wave obtained from the non-compacted Quantile Regression of sandstone p-wave impedance to sandstone p-wave impedance (III)
Impedance (IV) curve graph；
Figure 14 is sand, the mud stone p-wave impedance baseline that well statistics is surveyed in work area；
Figure 15 is that sandstone p-wave impedance curve (IV) is carried out sandstone longitudinal wave obtained from sandstone p-wave impedance baseline assignment
Impedance (V) curve graph；
Figure 16 is that mud stone p-wave impedance (b) is carried out mud stone p-wave impedance obtained from mud stone p-wave impedance baseline assignment
(c) curve graph；
Figure 17 be sandstone p-wave impedance (V) curve merge with mud stone p-wave impedance (c) curve obtained well logging longitudinal wave resistance
It is anti-to go p-wave impedance (B) curve graph after compaction treatment；
Figure 18 is the probability density distribution figure of p-wave impedance (B) curve after compaction treatment.
Specific embodiment
To enable above and other objects, features and advantages of the invention to be clearer and more comprehensible, preferably implementation is cited below particularly out
Example, and cooperate institute's accompanying drawings, it is described in detail below.
As shown in FIG. 1, FIG. 1 is the well logging p-wave impedances suitable for Application of Logging-constrained Inversion of the invention to go compaction treatment method
Flow chart.In step 101, the well logging p-wave impedance curve of real drilling well is chosen.Process enters step 102.
In step 102, according to the difference of lithology from the well logging p-wave impedance curve of real drilling well, respectively by respective lithology
Well logging p-wave impedance extracts, and obtains the well logging p-wave impedance curve of respective lithology.Process enters step 103.
Fig. 2 is the actual measurement original p-wave impedance of well (A) curve, bored at (2220-2450 the meter) of well section of display met sandstone with
Two kinds of lithology of mud stone；Fig. 4 be survey sandstone p-wave impedance (I) curve that is stripped out of the original p-wave impedance of well (A) point lithology and
Mud stone p-wave impedance (a) curve graph.
In step 103, point lithology calculates the non-depressed real component of p-wave impedance of respective lithology.Process enters step 104.
Fig. 5 is the non-depressed real component of p-wave impedance of sandstone, the influence mainly comprising factors such as hole, fluids, by laboratory
Simulation calculates.The non-depressed real component of the p-wave impedance of mud stone is smaller, can be ignored.
In step 104, each non-depressed real component of lithology p-wave impedance is rejected, i.e. each lithology longitudinal wave resistance obtained in step 2
It is anti-to subtract the non-depressed real component of its p-wave impedance.Process enters step 105.
In step 105, point lithology calculates the p-wave impedance compacting component of each lithology.Process enters step 106.
Fig. 7 be sandstone p-wave impedance and buried depth (vertical depth) the figure that crosses, Fig. 8 be sandstone p-wave impedance (II) with bury
On the basis of deep (vertical depth) cross analysis, it is fitted the compacting trend that sandstone p-wave impedance (II) is calculated；Fig. 9 is mud stone
The figure that crosses of p-wave impedance and buried depth (vertical depth), Figure 10 are the p-wave impedance (a) and buried depth (vertical depth) cross analysis in mud stone
On the basis of, it is fitted the compacting trend that mud stone p-wave impedance (a) is calculated.
In step 106, each lithology p-wave impedance compacting trend is rejected.Process enters step 107.
Figure 11 is that sandstone p-wave impedance (II) subtracts sandstone longitudinal wave obtained from the compacting trend of sandstone p-wave impedance (II)
Impedance (III)；Figure 12 is that mud stone p-wave impedance (a) subtracts mud stone longitudinal wave obtained from the compacting trend of mud stone p-wave impedance (a)
Impedance (b).
In step 107, lithology is divided to carry out each non-compacted Quantile Regression of lithology p-wave impedance.Sandstone needs to carry out p-wave impedance
Non-compacted Quantile Regression, and mud stone does not need.Process enters step 108.
Figure 13 is sandstone p-wave impedance (III) plus sandstone p-wave impedance obtained from the non-depressed real component of sandstone p-wave impedance
(IV).
In step 108, point lithology carries out the p-wave impedance baseline assignment of each lithology.The p-wave impedance baseline of each lithology be from
Each lithology longitudinal wave come out in the relatively shallower interval of buried depth is chosen in work area in the well logging p-wave impedance curve of real drilling well
Decision value, because the p-wave impedance of each lithology is relatively small by being compacted be influenced in the relatively shallower interval of buried depth,
Between each lithology, such as the p-wave impedance of mud stone, sandstone lithology overlaps that section is smaller, and p-wave impedance is average in shallow-layer buried depth section
There are biggish differences for value.In the relatively shallower interval of selection buried depth, should follow following principle: preferably purpose series of strata is opposite
Shallow-layer part can obtain preferable effect, if sedimentary facies belt differs greatly, it is contemplated that taking if sedimentary facies belt variation is less
Relatively shallow on purpose series of strata be layer by layer；Relatively shallow on purpose series of strata is preferential selection and purpose in selection layer by layer
Series of strata have the series of strata of similar deposition background.The above principle is followed to be conducive to by processing and finally obtained p-wave impedance curve
Have between reflection coefficient sequence calculated and the obtained synthetic seismogram road of wavelet convolution and original earthquake optimal
Matching.Process enters step 109.
Figure 14 in depth-logger is that 1450-1850 meters of well sections count by the well logging p-wave impedance of reality drilling wells all in work area
The p-wave impedance baseline of obtained sandstone and mud stone, this two p-wave impedance baselines respectively represent sand, mud stone in the buried depth section
The average value of the original well logging p-wave impedance of (1450-1850 meters).Figure 15 is that sandstone p-wave impedance curve (IV) is carried out sandstone
Sandstone p-wave impedance (V) curve obtained from p-wave impedance baseline assignment carries out whole drift to sandstone p-wave impedance (IV),
Its average value is floated on sandstone p-wave impedance baseline.Figure 16 is that mud stone p-wave impedance (b) is carried out mud stone p-wave impedance base
Mud stone p-wave impedance (c) curve obtained from line assignment carries out whole drift to mud stone p-wave impedance (b), by its average value
It floats on mud stone p-wave impedance baseline.
In step 109, each lithology p-wave impedance curve after baseline assignment is merged, to obtain final warp
It crosses well logging p-wave impedance and removes the p-wave impedance curve after compaction treatment.Process enters step 110.
Figure 17 is p-wave impedance (B) obtained from sandstone p-wave impedance (V) curve merges with mud stone p-wave impedance (c) curve
Curve, the curve, that is, original well logging p-wave impedance finally obtained p-wave impedance curve after going compaction treatment；
In step 110, Application of Logging-constrained Inversion is carried out using finally obtained p-wave impedance (B) curve of processing.
Figure 18 is the probability density distribution figure of p-wave impedance (B) curve, close with the probability of the actual measurement original p-wave impedance of well (A)
Degree distribution map (Fig. 3) is compared, although the p-wave impedance between sand, mud stone is there are still certain overlapping section, its main body is
Through separating, in biggish differentiation, the demand of reservoir prediction can satisfy, ideal effect can be obtained in Application of Logging-constrained Inversion
Fruit.
Claims (3)
1. a kind of well logging p-wave impedance suitable for Application of Logging-constrained Inversion goes compaction treatment method, characterized by comprising:
Step 1, well logging p-wave impedance curve is corresponding with lithology curve, the well logging p-wave impedance that point lithology extracts each lithology is bent
Line；
Step 2, the non-depressed real component of p-wave impedance of each lithology is calculated；
Step 3, each non-depressed real component of lithology p-wave impedance being calculated in step 2 is rejected, with the p-wave impedance value of each lithology
The non-depressed real component of p-wave impedance for subtracting respective lithology obtains rejecting each lithology longitudinal wave resistance after the non-depressed real component of p-wave impedance
It is anti-；
Step 4, point lithology respectively the Fitting Calculation go out eliminate the non-depressed real component of p-wave impedance each lithology p-wave impedance compacting
Trend, and weeded out；Respective lithology is subtracted using each lithology p-wave impedance for eliminating the non-depressed real component of p-wave impedance
P-wave impedance compacting trend, obtain compacting after each lithology p-wave impedance；
Step 5, it will go to press obtained in each non-compacted Quantile Regression to step 4 of lithology p-wave impedance that be calculated in step 2
In each lithology p-wave impedance after real trend, thus obtain each lithology go compacting p-wave impedance；
Step 6, the p-wave impedance after each lithology obtained in step 5 to be gone to compacting trend carries out the longitudinal wave resistance of respective lithology respectively
Anti- baseline assignment, each lithology p-wave impedance after obtaining baseline assignment；
Step 7, each lithology p-wave impedance after baseline assignment is merged, obtains one and removes compacting trend treated longitudinal wave
Impedance curve, and participate in subsequent Application of Logging-constrained Inversion.
2. the well logging p-wave impedance according to claim 1 suitable for Application of Logging-constrained Inversion goes compaction treatment method, special
Sign is, in step 1, by the corresponding relationship between the lithology curve of well logging and the p-wave impedance curve of well logging, by every kind
The well logging p-wave impedance of lithology individually extracts, thus by the well logging p-wave impedance curve separating of continuous type at multiple discrete types
Single lithologic log p-wave impedance curve；
In step 2, the non-depressed real component of p-wave impedance is calculated by the simulation of petrophysics experiment room；
In step 4, it when being fitted calculating to the compacting trend of each lithology p-wave impedance, is compacted for the p-wave impedance of mud stone
Trend is directly fitted calculating by the p-wave impedance curve of mud stone, and the p-wave impedance compacting for sandstone, limestone lithology becomes
Gesture only can just be fitted calculating after eliminating the non-depressed real component of p-wave impedance；
In step 6, the well logging p-wave impedance baseline of each lithology is the selection buried depth phase from original well logging p-wave impedance curve
To each lithology p-wave impedance average value come out in shallower interval.
3. the well logging p-wave impedance according to claim 2 suitable for Application of Logging-constrained Inversion goes compaction treatment method, special
Sign is that the method for choosing the relatively shallower interval of buried depth in step 6 follows following principle: for the relatively shallow of purpose series of strata
Layer part, selects sedimentary facies belt to change little part, if sedimentary facies belt differs greatly, chooses the phase on purpose series of strata
To shallow-layer series of strata；It is layer by layer for relatively shallow on purpose series of strata, selection has the layer of similar deposition background with purpose series of strata
System.
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