CN110159263A - Well logging gas surveys the method that component frequency spectrum overlapping backward index determines properties of fluid in bearing stratum - Google Patents
Well logging gas surveys the method that component frequency spectrum overlapping backward index determines properties of fluid in bearing stratum Download PDFInfo
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- CN110159263A CN110159263A CN201910460416.4A CN201910460416A CN110159263A CN 110159263 A CN110159263 A CN 110159263A CN 201910460416 A CN201910460416 A CN 201910460416A CN 110159263 A CN110159263 A CN 110159263A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a kind of well logging gas to survey the method that component frequency spectrum overlapping backward index determines properties of fluid in bearing stratum, includes the following steps: a, calculates separately the collected ethane C of gas analyser for well logging2, propane C3, iso-butane iC4, isopentane iC5Gas power scale spectrum；B, the gas power scale being calculated spectrum is overlapped into figure, calculates separately overlapping backward oil index and aqua index；C, setting discrimination model determines Reservoir Section oiliness and whether produces water.Conventional depth domain-time-domain well logging gas survey analysis method is expanded to frequency domain by the present invention, and differentiates oiliness and the property of water-bearing according to the backward folding method that quantitative relation between alkane component establishes the characteristic parameter for surveying component based on well logging gas.
Description
Technical field
The present invention relates to a kind of well logging gas to survey the method that component frequency spectrum overlapping backward index determines properties of fluid in bearing stratum, belongs to
The measurement of electro-mechanical arts industrial gas oil exploration and development scope log data, processing technology field.
Background technique
Currently, Oil Layer Reservoir flow net model is good at NORTH CHINA oil field and engineering services side, and well logging solution
It releases at present mainly based on scatterplot-crossplot method, also visual parameter curve method, is limited to above-mentioned analysis processing method
Characteristic, well logging Gas Logging Value is explained to determine to rely on and visually observes and manually sentence knowledge, subjective based on quantitative and semi-quantitative,
Accuracy of identification and accuracy rate be not high, and traditional logging explanation method is often " to have logging presentation just to analyze, have logging presentation just to solve
Release ", drop ply, misjudgement phenomenon are commonplace, need to research and develop it is a kind of can be important for log data is analyzed and is explained
Specific well section carries out the judgment method and technology of global analysis.
Retrieval discovery, the search result for having no " well logging Gas Logging Value " and " oil reservoir " while occurring utilize well logging Gas Logging Value
The patented technology for carrying out oil layer recognition is less, and " well logging Gas Logging Value " keyword is then visible " to be based on drilling fluid logging parameter Gas Logging Value
Logging explanation method (application number: 201810556205.6, the applying date: 2018-05-31, river celebrate the limited public affairs of drilling project
Department) ", " carry out the logging explanation method (application number: 201810553427.2 that reservoir sentences knowledge using triangle plate and probability graph road
The applying date: 2018-05-31, Chuan Qing drilling project Co., Ltd) " etc., above-mentioned means of interpretation be based on when m- Depth Domain benefit
Oil-gas Layer fluid identification is carried out with chart method, from frequency-domain analysis and does not utilize Gas Logging Value using spectrum analysis means；In addition, closing
Key word " well logging " and " Reservoir interpretation " then visible " gas detection logging Reservoir interpretation method (application based on oil reservoir quantitative judge plate
Number: 201510524973.X, the applying date: 2015-08-25, Tianjin Branch, China Sea Petroleum (China) have no right-refute
The state of returning) ", which states the explanation that reservoir fluid property identification is established according to the characteristic component ratio of well logging Gas Logging Value
Plate is the simple computation based on Depth Domain.Patent database search key " reservoir fluid ", entry is more, representative
Patent Case be " a kind of oil-gas-water layer well logging starry sky explanation evaluating method (and application number: 201710426025.1, the applying date: 2017-
06-08, China petroleum Group Pohai drilling Engineering Co., Ltd) ", which proposes a kind of utilization gas survey
Component " starry sky " means of interpretation carries out the scheme of oil-gas-water layer flow net model, tentatively solves point, line intersects, overlapping is blocked
The problems such as, integrated application well logging Gas Logging Value and geochemical logging TPI parameter etc., although having certain effect, but still in Depth Domain
It calculates and analyzes.To sum up, the oil reservoir well logging gas reservoir prediction method of mainstream at present, establish when m- Depth Domain on the basis of,
It usually only analyzes and high abnormal " logging presentation " layer of well logging gas survey occurs, there is dependence subjectivity to sentence knowledge, be easy to be limited to visually to see
Examine with subjective judgement and the risk of drop ply, erroneous judgement.
In addition, application number 201610962713.5, publication date 2017-02-15, disclose a kind of based on brill multi-parameter point
The oil gas water identification method and system of analysis, but be disadvantageous in that existing for it: (1), data source " color is described as according to its patent
Spectrum signal " and " chromatogram " do not limit mode and pattern (data format) that chromatographic signal obtains, patent claims
By " chromatographic signal acquisition chromatogram ", the processing of patent subsequent step and process object are chromatogram, the element of processing for description
Similarity of maps, figure correlation between chromatogram, data source are biased to instrument close beta and debugging.(2), tend to
Form comparison and descriptive analysis, main purpose are in Fu for carry out peak value or peak area to the chromatographic peak that chromatograph inside obtains
Leaf transformation calculates, and obtains frequency domain value, then calculates crosspower spectrum, emphasize chromatography to be calculated or chromatography to be explained for criterion numeral
According to correlation analysis, have a disadvantage in that the determination to normal data and specification do not elaborate in detail in the claims, give
The invention of people's one kind is the tentative imagination for being difficult to operate realization rather than practicability or the practical technique by experimental examination.
(3), its core concept is the similitude comparison of spectrogram, but setting for standard spectrogram and establishes clearly proposing,
The various for spectrogram situation and scatter plot of coefficient R are only provided, for the auxiliary judgment of resistivity curve in well logging etc.
There is no detailed standard and explanation, more generally.
Summary of the invention
It is an object of the invention to overcome the above problem of the existing technology, it is folded to provide a kind of well logging gas survey component frequency spectrum
Close the method that backward index determines properties of fluid in bearing stratum.Conventional depth domain-time-domain well logging gas is surveyed analysis method by the present invention
Frequency domain is expanded to, and establishes the backward overlapping side for surveying the characteristic parameter of component based on well logging gas according to quantitative relation between alkane component
Method differentiates oiliness and the property of water-bearing.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of method that well logging gas surveys component frequency spectrum overlapping backward index judgement properties of fluid in bearing stratum, includes the following steps:
A, the collected ethane C of gas analyser for well logging is calculated separately2, propane C3, iso-butane iC4, isopentane iC5Gas measurement of power
Rate spectrum；
B, the gas power scale being calculated spectrum is overlapped into figure, calculates separately overlapping backward oil index and aqua index；
C, setting discrimination model determines Reservoir Section oiliness and whether produces water.
The step a is specifically included:
(1), it data prediction: adjusts well logging gas to be processed and surveys 2 required by parameter to spectrum analysisx, x ∈ Z+A data
Point, and trending processing and decentralization processing are carried out to data adjusted；
(2), spectra calculation: carrying out Fast Fourier Transform (FFT) for pretreated well logging gas measured data, obtains corresponding
The mould of sequence of complex numbers is calculated in sequence of complex numbers, draws power spectrum chart according to the mould of sequence of complex numbers.
Adjustment well logging gas to be processed survey parameter to set a data point include: set well logging gas survey parameter to be processed as
Ci, wherein i=1,2,3 ..., m, if m=2x+ y, and y is the minimum value enumerated in expression formula, as y=0, is directly surveyed to gas
Argument sequence is continued to employ, and as y < 0, then supplements 0 value of y item to argument sequence, as y > 0, then removes y data with existing point, will
Well logging gas to be processed is surveyed parameter and is adjusted to m=2xA data point.
With ethane C2For, it is described that trending is gone to handle are as follows: Ci=Ci-Ci-1；Decentralization processing are as follows: Ci=Ci-μc；Its
In, μcC is surveyed for well section gas to be processediThe average value of component, CiFor the Gas Logging Value ethane component of corresponding i-th of depth point.
The spectra calculation includes:
The pretreated well logging gas measured data that (1) is obtained carries out Fast Fourier Transform (FFT), obtains corresponding plural sequence
Column, if well logging gas measured data time series to be processed is x (t), wherein t=0,1,2,3 ..., n, n ∈ Z+If Fu to be asked
In leaf transformation complex result be X (k), formula is as follows:
The mould P (k) of calculated complex sequence, in addition, akFor the real part of P (k), bkFor the imaginary part of P (k), algorithm is as follows:
The step b is specifically included:
The gas surveys component C2、C3、iC4、iC5Corresponding power spectrum chart overlapped under same abscissa and present it is certain poor
Value, chooses C respectively3、C2Difference calculates overlapping backward oil index Δ Po, choose iC5、iC4Difference calculates overlapping backward aqua index Δ
Pw, wherein calculating formula is as follows:
Overlap backward oil index Δ PoCalculation is as follows:
Overlap backward aqua index Δ PwCalculation is as follows:
Wherein, j ∈ Z+, n is Reservoir Section thickness to be explained, max (f (C2)) it is Reservoir Section C to be explained2Power spectrum maximum number
Value, min (f (Cq)) it is Reservoir Section iC to be explained4Component power spectrum greatest measure, f (C3j) it is that jth rice corresponds to C3Power intensity values,
f(C2j) it is that jth rice corresponds to C2Power intensity values, f (Cpj) it is that jth rice corresponds to iC5Power intensity values, f (Cqj) it is that jth rice is corresponding
iC4Power intensity values.
The step c is specifically included:
Overlap backward oil index Δ PoWith overlapping backward aqua index Δ PwOil-gas possibility method of discrimination about reservoir to be explained
It is as follows:
Reservoir not oil-producing:
ΔPo=0
Oil reservoir (not aqueous):
ΔPo> 0
ΔPw< 0
Water layer:
ΔPo< 0
Or Δ Pw> 0.
Compared with prior art, using the present invention has the advantages that
(1) data acquisition source of the present invention is more: data source of the present invention is in including well logging chromatograph but being not limited to other
The collected gas measured data of analytical equipment, data format are that 1 depth point uniquely corresponds to the one-to-one " deep of 1 data
Degree evidence " is discrete data, and consistent with the chromatographic apparatus common data form of petroleum industry field application, has industry general
All over property and refering in particular to property, in addition, data source of the present invention can be not only restricted to the property of acquisition equipment, all gas that can collect surveys number
Inspection is surveyed according to and with well logging gas that Gas Logging Value measuring device that installation controlled condition described in invention or controlled factordisease influence obtains
In measured data is all contained in.
(2) trend data analysis of the present invention: the present invention is by carrying out the deletion of 2n data to discrete well logging Gas Logging Value data
Or cover, then carry out decentralization processing, then using Fast Fourier Transform (FFT) FFT by when m- Depth Domain on it is discrete
Gas measured data is transformed into frequency domain and obtains power spectrum chart；On this basis, calculating well logging Gas Logging Value is representative and boundary is anticipated
The propane C of justice3With ethane C2Frequency spectrum cumulative difference value (the more C of carbon number of component3The C less relative to carbon number2Increase
Amount), and the judgement section of oiliness and the property of water-bearing is judged in setting, the Land use systems of spectrogram are further specified, are given
The quantitative well logging Gas Logging Value of sxemiquantitative-judges the solution of reservoir fluid property, has operability.
(3) the technology of the present invention key point is that power spectrum chart establishes gentle survey characteristic value overlapping backward (oil, water) index calculating
Unlike the prior art with the differentiation of reservoir fluid property threshold, and there is continuity and specific aim.
(4) component characteristics parameter propane C is surveyed for gas for the first time3, ethane C2, iso-butane iC4And isopentane iC5Carry out power
Spectrum is calculated and is analyzed according to spectrogram folding method, and total hydrocarbon TG is divided into light component for boundary essentially according to propane by existing method
It is compared and analyzes with heavy constituent, m- Depth Domain when being confined to, analysis method relies on the naked eyes subjectivity such as plate and curve method and sentences
Knowledge method differentiates that difficulty is larger, is difficult to relationship between surveying component based on gas and carries out quantitative-semi-quantitative analysis；The present invention is directed to gas for the first time
Survey component characteristics parameter propane C3, ethane C2, iso-butane iC4And isopentane iC5It is calculated and is analyzed, added by spectrometer
The capacity volume variance of row power spectrum compares, and from frequency domain angle analysis well logging Gas Logging Value, and then quantitative-sxemiquantitative judges reservoir oiliness
And the property of water-bearing, and discrimination model is intuitive compared with conventional method, succinct.
Detailed description of the invention
Fig. 1 is that spectrogram backward of the present invention overlaps difference schematic diagram.
Specific embodiment
A kind of numerical value for well logging Gas Logging Value data of system of the present invention and descriptive means of interpretation.
Implementation step decomposes as follows:
A, the collected ethane C of gas analyser for well logging is calculated separately2, propane C3, iso-butane iC4, isopentane iC5Gas measurement of power
Rate spectrum；
B, the gas power scale being calculated spectrum is overlapped into figure, calculates separately overlapping backward oil index and aqua index；
C, setting discrimination model determines Reservoir Section oiliness and whether produces water.
The step a is specifically included:
(1), it data prediction: adjusts well logging gas to be processed and surveys 2 required by parameter to spectrum analysisx, x ∈ Z+A data
Point, and trending processing and decentralization processing are carried out to data adjusted；
(2), spectra calculation: carrying out Fast Fourier Transform (FFT) for pretreated well logging gas measured data, obtains corresponding
The mould of sequence of complex numbers is calculated in sequence of complex numbers, draws power spectrum chart according to the mould of sequence of complex numbers.
Adjustment well logging gas to be processed survey parameter to set a data point include: set well logging gas survey parameter to be processed as
Ci, wherein i=1,2,3 ..., m, if m=2x+ y, and y is the minimum value enumerated in expression formula, as y=0, is directly surveyed to gas
Argument sequence is continued to employ, and as y < 0, then supplements 0 value of y item to argument sequence, as y > 0, then removes y data with existing point, will
Well logging gas to be processed is surveyed parameter and is adjusted to m=2xA data point.
With ethane C2For, it is described that trending is gone to handle are as follows: Ci=Ci-Ci-1；Decentralization processing are as follows: Ci=Ci-μc；Its
In, μcC is surveyed for well section gas to be processediThe average value of component, CiFor the Gas Logging Value ethane component of corresponding i-th of depth point.
The spectra calculation includes:
Pretreated well logging gas measured data is subjected to Fast Fourier Transform (FFT), corresponding sequence of complex numbers is obtained, if wait locate
The well logging gas measured data time series of reason is x (t), wherein t=0,1,2,3 ..., n, n ∈ Z+If Fourier transformation to be asked is multiple
Number result is X (k), and formula is as follows:
The mould P (k) of calculated complex sequence, in addition, akFor the real part of P (k), bkFor the imaginary part of P (k), algorithm is as follows:
Ordinate is set as power P, and abscissa is set as frequency f, draws ethane C respectively2, propane C3, iso-butane iC4, it is different
Pentane iC5Gas power scale spectrogram.
2) spectrogram overlaps, and calculates overlapping backward index
The gas surveys component C2、C3、iC4、iC5Corresponding power spectrum chart overlapped under same abscissa and present it is certain poor
Value, chooses C respectively3、C2Difference calculates overlapping backward oil index Δ Po, choose iC5、iC4Difference calculates overlapping backward aqua index Δ
Pw, wherein calculating formula is as follows:
Overlap backward oil index Δ PoCalculation is as follows:
Overlap backward aqua index Δ PwCalculation is as follows:
Wherein, j ∈ Z+, n is Reservoir Section thickness to be explained, max (f (C2)) it is Reservoir Section C to be explained2Power spectrum maximum number
Value, min (f (Cq)) it is Reservoir Section iC to be explained4Component power spectrum greatest measure, f (C3j) it is that jth rice corresponds to C3Power intensity values,
f(C2j) it is that jth rice corresponds to C2Power intensity values, f (Cpj) it is that jth rice corresponds to iC5Power intensity values, f (Cqj) it is that jth rice is corresponding
iC4Power intensity values.
3) Reservoir Section oiliness is determined according to discrimination model and whether produces water
Overlap backward oil index Δ PoWith overlapping backward aqua index Δ PwOil-gas possibility method of discrimination about reservoir to be explained
It is as follows:
Reservoir not oil-producing:
ΔPo=0
Oil reservoir (not aqueous):
ΔPo> 0
ΔPw< 0
Water layer:
ΔPo< 0
Or Δ Pw> 0.
Claims (7)
1. a kind of well logging gas surveys the method that component frequency spectrum overlapping backward index determines properties of fluid in bearing stratum, it is characterised in that: including
Following steps:
A, the collected ethane C of gas analyser for well logging is calculated separately2, propane C3, iso-butane iC4, isopentane iC5Gas power scale spectrum
Value；
B, the gas power scale being calculated spectrum is overlapped into figure, calculates separately overlapping backward oil index and aqua index；
C, setting discrimination model determines Reservoir Section oiliness and whether produces water.
2. well logging gas according to claim 1 surveys the method that component frequency spectrum overlapping backward index determines properties of fluid in bearing stratum,
It is characterized by: the step a is specifically included:
(1), it data prediction: adjusts well logging gas to be processed and surveys 2 required by parameter to spectrum analysisx, x ∈ Z+A data point, and
Trending processing and decentralization processing are carried out to data adjusted；
(2), spectra calculation: pretreated well logging gas measured data is subjected to Fast Fourier Transform (FFT), obtains corresponding plural number
The mould of sequence of complex numbers is calculated in sequence, draws power spectrum chart according to the mould of sequence of complex numbers.
3. well logging gas according to claim 2 surveys the method that component frequency spectrum overlapping backward index determines properties of fluid in bearing stratum,
It is characterized by: it includes: to set well logging gas to be processed to survey parameter that the adjustment well logging gas to be processed, which surveys parameter to a data point is set,
For Ci, wherein i=1,2,3 ..., m, if m=2x+ y, and y is the minimum value enumerated in expression formula, as y=0, directly to gas
It surveys argument sequence to continue to employ, as y < 0, then supplements 0 value of y item to argument sequence, as y > 0, then remove y data with existing point,
Well logging gas to be processed survey parameter is adjusted to m=2xA data point.
4. well logging gas according to claim 3 surveys the method that component frequency spectrum overlapping backward index determines properties of fluid in bearing stratum,
It is characterized by: with ethane C2For, it is described that trending is gone to handle are as follows: Ci=Ci-Ci-1；Decentralization processing are as follows: Ci=Ci-μc；
Wherein, μcC is surveyed for well section gas to be processediThe average value of component, CiFor the Gas Logging Value ethane component of corresponding i-th of depth point.
5. well logging gas according to claim 4 surveys the method that component frequency spectrum overlapping backward index determines properties of fluid in bearing stratum,
It is characterized by: the spectra calculation includes:
The pretreated well logging gas measured data that (1) is obtained carries out Fast Fourier Transform (FFT), obtains corresponding sequence of complex numbers, if
Well logging gas measured data time series to be processed is x (t), wherein t=0,1,2,3 ..., n, n ∈ Z+If Fourier to be asked becomes
Changing complex result is X (k), and formula is as follows:
The mould P (k) of calculated complex sequence, in addition, akFor the real part of P (k), bkFor the imaginary part of P (k), algorithm is as follows:
6. well logging gas according to claim 5 surveys the method that component frequency spectrum overlapping backward index determines properties of fluid in bearing stratum,
It is characterized by: the step b is specifically included:
The gas surveys component C2、C3、iC4、iC5Corresponding power spectrum chart overlaps under same abscissa and presents certain difference, point
It Xuan Qu not C3、C2Difference calculates overlapping backward oil index Δ Po, choose iC5、iC4Difference calculates overlapping backward aqua index Δ Pw,
In, calculating formula is as follows:
Overlap backward oil index Δ PoCalculation is as follows:
Overlap backward aqua index Δ PwCalculation is as follows:
Wherein, j ∈ Z+, n is Reservoir Section thickness to be explained, max (f (C2)) it is Reservoir Section C to be explained2Power spectrum greatest measure,
min(f(Cq)) it is Reservoir Section iC to be explained4Component power spectrum greatest measure, f (C3j) it is that jth rice corresponds to C3Power intensity values, f
(C2j) it is that jth rice corresponds to C2Power intensity values, f (Cpj) it is that jth rice corresponds to iC5Power intensity values, f (Cqj) it is that jth rice corresponds to iC4
Power intensity values.
7. well logging gas according to claim 6 surveys the method that component frequency spectrum overlapping backward index determines properties of fluid in bearing stratum,
It is characterized by: the step c is specifically included:
Overlap backward oil index Δ PoWith overlapping backward aqua index Δ PwOil-gas possibility method of discrimination about reservoir to be explained is such as
Under:
Reservoir not oil-producing:
ΔPo=0
Oil reservoir (not aqueous):
ΔPo> 0
ΔPw< 0
Water layer:
ΔPo< 0
Or Δ Pw> 0.
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| CN113159978A (en) * | 2021-05-07 | 2021-07-23 | 中国石油天然气集团有限公司 | Automatic analysis method for logging gas logging data |
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