CN102900433B - The method utilizing discriminant analysis to set up gas mapping version to judge reservoir fluid - Google Patents
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Abstract
The invention discloses a kind of method utilizing discriminant analysis to set up gas mapping version to judge reservoir fluid, relate to petroleum natural gas exploration technical field, comprise the steps: a, collect the gas that formation testing terminates well and survey peak value display data and formation testing result; B, according to obtained formation testing resulting class, by the gas of each identical for formation testing result classification logging presentation section survey peak-data divide into groups; C, to survey based on peak-data by the gas of logging presentation well section and set up Assessing parameters; D, choose set up Assessing parameters, according to discriminant analysis, set up the discriminant function effectively distinguishing fluid properties; E, according to the coincidence rate of each discriminant function set up, preferably wherein two discriminant functions that coincidence rate is the highest set up gas mapping version respectively as x, y-axis, differentiate properties of fluid in bearing stratum.The invention solves the problem that current conventional gas mapping version is difficult to effectively distinguish reservoir fluid, the dominant area of different fluid can be marked off preferably.
Description
Technical field
The present invention relates to petroleum natural gas exploration technical field, exactly relate to a kind of method utilizing discriminant analysis to set up gas mapping version to judge reservoir fluid.
Background technology
In natural gas exploration and development process, gas mapping version is the important means of understanding properties of fluid in bearing stratum.Specifically, gas mapping version is a two-dimentional fluid judgement system, needs to utilize two fluid discriminant parameters to set up two-dimentional plate.
Publication number is CN102562051A, publication date is that the Chinese patent literature on July 11st, 2012 discloses a kind of gas mapping version original data processing method, comprise the steps: a kind of method processing gas mapping version initial data, comprise the steps: step a, obtain well logging Gas Logging Value and formation testing result that gas reservoir formation testing terminates well; Step b, carries out arithmetic average by the Gas Logging Value between the half range point of the Gas Logging Value curve ascent stage of display well section and the half range point reducing section, obtains arithmetic mean of instantaneous value; Step c, the design formulas arithmetic mean of instantaneous value calculated being substituted into each gas mapping version calculates horizontal stroke, ordinate value; Steps d, in conjunction with formation testing achievement, substitutes into each gas mapping version by the horizontal stroke of acquisition, ordinate value; Step e, according to the distribution situation of each data point in gas mapping version, draws Fen Qi district and the water aquifer of reservoir, thus sets up gas mapping version.The present invention, by process again to gas mapping version initial data, can catch the effective information of Gas Logging Value reflection more fully, objective, be familiar with reservoir truly.
But the gas mapping version of the routine being representative with above-mentioned patent is all the empirical parameter using canonical parameter or use other area, and practical application effect is undesirable, mainly there is following problem:
1, due to the complexity of characteristic of fluid and each opposite sex of Regional Geological Characteristics, routine or on the plate used, the data point of different fluid character mixes mutually, be difficult to distinguish.
2, utilize gas logging curve feature larger as the difficulty carrying out differentiating according to convection cell character.
3, gas survey peak value has good response for properties of fluid in bearing stratum, but its inherent law is often difficult to find with naked eyes and experience.
Summary of the invention
For solving technical problem existing in above-mentioned prior art, the present invention proposes a kind of method utilizing discriminant analysis to set up gas mapping version to judge reservoir fluid, the invention solves the problem that current conventional gas mapping version is difficult to effectively distinguish reservoir fluid, the dominant area of different fluid can be marked off preferably.
The present invention realizes by adopting following proposal:
The method utilizing discriminant analysis to set up gas mapping version to judge reservoir fluid, is characterized in that comprising the steps:
A, collect the gas that formation testing terminates well and survey peak value display data and formation testing result;
B, according to obtained formation testing resulting class, by the gas of each identical for formation testing result classification logging presentation section survey peak-data divide into groups;
C, to survey based on peak-data by the gas of logging presentation well section and set up Assessing parameters;
D, choose set up Assessing parameters, according to discriminant analysis, set up the discriminant function effectively distinguishing fluid properties;
E, according to the coincidence rate of each discriminant function set up, preferably wherein two discriminant functions that coincidence rate is the highest set up gas mapping version respectively as x, y-axis, differentiate properties of fluid in bearing stratum.
Described Step d, repeatedly chooses Assessing parameters, sets up multiple discriminant function, then carries out step e.
In described step c, after setting up Assessing parameters, adopt the mode of Mathematical treatment to carry out preferably to set up Assessing parameters: the Gas Logging Value of logging presentation well section respectively: TG, C
1, C
2, C
3, iC
4, nC
4, iC
5and nC
5, to TG, C
1, C
2, C
3, iC
4, nC
4, iC
5and nC
5these 8 parameters, all divided by TG, form 8 new Assessing parameters: TG
/tG, C
1/tG, C
2/tG, C
3/tG, iC
4/tG, nC
4/tG, iC
5/tG, nC
5/tG, then:
Assessing parameters
formula 1.
In described Step d, choose set up Assessing parameters, according to discriminant analysis, the discriminant function that foundation effectively can distinguish fluid properties is specially: according to the Assessing parameters optimized, set up discriminant function F (gas survey), and survey peak value display data group according to the gas of the different groups set up with formation testing result, pass through discriminant analysis, simulate coefficient a, b, c, d, e, f, g and h, obtain discriminant function F (gas survey):
formula 2.
In described b step, formation testing resulting class is divided into: the same layer of gas-bearing formation, water layer or air water.
In described a step, be that the gas that in the same block collected, formation testing terminates well surveys peak value display data and formation testing result.
Compared with prior art, the beneficial effect that reaches of the present invention is as follows:
1, the technical scheme that the said abcde five steps of this method is formed is adopted, on the basis undesirable relative to current existing gas mapping version result of use, creatively propose to utilize discriminant analysis to set up gas mapping version to judge reservoir fluid, solve the problem that current conventional gas mapping version is difficult to effectively distinguish reservoir fluid, the dominant area of different fluid can be marked off preferably.
2, in the present invention, a step is that the gas that in the same block collected, formation testing terminates well surveys peak value display data and formation testing result, based on region data, utilizes discriminant analysis to set up gas mapping version, can convection cell character differentiate more accurately.
3, in the present invention, in step c after setting up Assessing parameters, adopt the mode of Mathematical treatment to carry out preferably to set up Assessing parameters, such technical scheme obtains the Assessing parameters that more effectively can reflect properties of fluid in bearing stratum, can convection cell character differentiate more accurately.
4, in the present invention, be described Step d, repeatedly choose Assessing parameters, set up multiple discriminant function, then carry out step e, such mode can set up the higher gas mapping version of coincidence rate, thus more accurate to the judgement of reservoir fluid.
Accompanying drawing explanation
Below in conjunction with Figure of description and embodiment, description clearly is further carried out to the present invention, wherein:
Accompanying drawing 1 is method flow diagram of the present invention;
The gas mapping version schematic diagram that accompanying drawing 2 utilizes discriminant analysis to set up for the present invention.
Detailed description of the invention
Embodiment 1
The invention discloses a kind of method utilizing discriminant analysis to set up gas mapping version to judge reservoir fluid, it is characterized in that comprising the steps:
A, collect the gas that formation testing terminates well and survey peak value display data and formation testing result;
B, according to obtained formation testing resulting class, by the gas of each identical for formation testing result classification logging presentation section survey peak-data divide into groups;
C, to survey based on peak-data by the gas of logging presentation well section and set up Assessing parameters;
D, choose set up Assessing parameters, according to discriminant analysis, set up the discriminant function effectively distinguishing fluid properties;
E, according to the coincidence rate of each discriminant function set up, preferably wherein two discriminant functions that coincidence rate is the highest set up gas mapping version respectively as x, y-axis, differentiate properties of fluid in bearing stratum.
Embodiment 2
With reference to Figure of description 1 and 2, preferred forms of the present invention is as follows:
1, in comprehensive same block, formation testing terminates the gas survey peak value display data of well, and the formation testing result different according to it is divided into different groups.
Describedly different groups is divided into be according to its different formation testing result: to survey formation testing resulting class (such as: gas-bearing formation, water layer, air water are with layer etc.) corresponding to display according to each gas, each peak value display data are divided into groups, example is determined as with air water, be that the gas survey peak value display data that gas-bearing formation is corresponding are classified as 1 group by formation testing result, to be air water by formation testing result survey peak value display data with the gas of layer correspondence is classified as 2 groups, by that analogy.
2, based on the Gas Logging Value of logging presentation well section (TG, C1, C2, C3, iC4, nC4, iC5, nC5), Assessing parameters is set up.
Describedly based on the Gas Logging Value of logging presentation well section (TG, C1, C2, C3, iC4, nC4, iC5, nC5), set up Assessing parameters be: Mathematical treatment is carried out to these 8 parameters of TG, C1, C2, C3, iC4, nC4, iC5, nC5, such as: by these 8 all divided by TG, 8 new Assessing parameters are formed: TG/TG, C1/TG, C2/TG, C3/TG, iC4/TG, nC4/TG, iC5/TG, nC5/TG.
Then:
Assessing parameters
formula 1
3, recycle discriminant analysis, set up multiple discriminant function effectively distinguishing fluid properties.
Describedly utilize discriminant analysis, setting up multiple discriminant function effectively distinguishing fluid properties is: according to the Assessing parameters optimized, and sets up discriminant function F (gas survey).And survey peak value display data group according to the gas of the different groups set up with formation testing result, by discriminant analysis, simulate coefficient a, b, c, d, e, f, g and h, obtain discriminant function F (gas survey).
formula 2
4, according to the coincidence rate of each discriminant function set up, preferably wherein two discriminant functions that coincidence rate is the highest set up gas mapping version respectively as x, y-axis.
Advantage of the present invention is as follows:
1) method, utilizing discriminant analysis to set up gas mapping version belongs to the innovation of log data application process.Be on the basis that current conventional gas mapping version result of use is undesirable, based on Gas Logging Value, set up Assessing parameters, recycling discriminant analysis, sets up the discriminant function effectively distinguishing fluid properties, and final formation has the gas mapping version of higher applicability.
2), this method proposes under current Gas logging data constantly accurate background, based on region data, utilizes discriminant analysis to set up gas mapping version, can convection cell character differentiate more accurately.
3), this method is complicated at current reservoir water-gas relation, the conventional gas of simple utilization is surveyed and basis that data are difficult to differentiate reservoir fluid is proposed, gas according to conventional gas mapping version surveys parameter mode, seeks the Assessing parameters that more effectively can reflect properties of fluid in bearing stratum.
4), this method be on the basis that current existing gas mapping version result of use is undesirable creatively propose utilize discriminant analysis to set up gas mapping version, solve the problem that current well logging fluid interpretation coincidence rate is lower.
Embodiment 3
Following is embody rule process of the present invention:
1, well logging gas survey peak value display data and formation testing result data that formation testing in same block terminates well is collected.
2, according to formation testing result, each identical for formation testing result classification logging presentation peak-data is divided into groups.
3, the Assessing parameters of properties of fluid in bearing stratum can preferably more effectively be reflected.
4, utilize discriminant analysis, set up multiple discriminant function effectively distinguishing fluid properties
.
5, according to the coincidence rate of each discriminant function set up, preferably wherein two discriminant functions that coincidence rate is the highest set up gas mapping version respectively as x, y-axis.
In practice, in order to set up the higher gas mapping version of coincidence rate, may need repeatedly to choose Assessing parameters, setting up multiple discriminant function, then carry out preferably.
Claims (3)
1. the method utilizing discriminant analysis to set up gas mapping version to judge reservoir fluid, is characterized in that comprising the steps:
A, collect the gas that formation testing terminates well and survey peak value display data and formation testing result;
B, according to obtained formation testing resulting class, by the gas of each identical for formation testing result classification logging presentation section survey peak-data divide into groups;
C, to survey based on peak-data by the gas of logging presentation well section and set up Assessing parameters;
D, choose set up Assessing parameters, according to discriminant analysis, set up the discriminant function effectively distinguishing fluid properties;
E, according to the coincidence rate of each discriminant function set up, select wherein two discriminant functions that coincidence rate is the highest to set up gas mapping version respectively as x, y-axis, properties of fluid in bearing stratum is differentiated;
Described Step d, repeatedly chooses Assessing parameters, sets up multiple discriminant function, then carries out step e;
In described step c, after setting up Assessing parameters, adopt the mode of Mathematical treatment to select to set up Assessing parameters: the Gas Logging Value of logging presentation well section respectively: TG, C
1, C
2, C
3, iC
4, nC
4, iC
5and nC
5, to TG, C
1, C
2, C
3, iC
4, nC
4, iC
5and nC
5these 8 parameters, all divided by TG, form 8 new Assessing parameters: TG
/tG, C
1/tG, C
2/tG, C
3/tG, iC
4/tG, nC
4/tG, iC
5/tG, nC
5/tG, then:
Assessing parameters
(1);
In described Step d, choose set up Assessing parameters, according to discriminant analysis, the discriminant function that foundation effectively can distinguish fluid properties is specially: according to the Assessing parameters selected, set up discriminant function F (gas survey), and survey peak value display data group according to the gas of the different groups set up with formation testing result, pass through discriminant analysis, simulate coefficient a, b, c, d, e, f, g and h, obtain discriminant function F (gas survey):
（2）。
2. a kind of method utilizing discriminant analysis to set up gas mapping version to judge reservoir fluid according to claim 1, it is characterized in that: in described b step, formation testing resulting class is divided into: the same layer of gas-bearing formation, water layer or air water.
3. a kind of method utilizing discriminant analysis to set up gas mapping version to judge reservoir fluid according to claim 1, is characterized in that: in described a step, is that the gas that in the same block collected, formation testing terminates well surveys peak value display data and formation testing result.
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Cited By (2)
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| CN106437691A (en) * | 2016-08-05 | 2017-02-22 | 中国石油集团长城钻探工程有限公司录井公司 | Low gas-oil-ratio oil reservoir gas logging evaluation method |
| CN108005649A (en) * | 2017-12-15 | 2018-05-08 | 中国石油集团川庆钻探工程有限公司 | The method that efficiency value differentiation formation fluid property is surveyed using gas |
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| CN103742132A (en) * | 2013-12-24 | 2014-04-23 | 中国石油集团长城钻探工程有限公司 | Gas logging data all-hydrocarbon numerical value increase rate calculating method |
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