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Method for discriminating reservoir fluid by establishing gas logging chart on basis of discriminant analysis

A technique of discriminant analysis and gas survey chart, applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve problems such as difficult to effectively distinguish reservoir fluids, and achieve accurate discrimination and accurate judgment

Active Publication Date: 2013-01-30
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the technical problems in the above-mentioned prior art, the present invention proposes a method for judging reservoir fluids by using discriminant analysis to establish gas survey charts. The problem of different fluids can be better divided

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  • Method for discriminating reservoir fluid by establishing gas logging chart on basis of discriminant analysis
  • Method for discriminating reservoir fluid by establishing gas logging chart on basis of discriminant analysis

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Effect test

Embodiment 1

[0033] The invention discloses a method for judging reservoir fluid by using discriminant analysis to establish a gas survey chart, which is characterized in that it includes the following steps:

[0034] a. Collect gas testing peak data and oil testing results of wells after oil testing;

[0035] b. According to the category of the obtained oil testing results, group the gas testing peak data of each mud logging display segment with the same oil testing result category;

[0036] c. Establish a discriminant factor based on the gas logging peak data of the well section shown in mud logging;

[0037] d. Select the established discriminant factor, and establish a discriminant function that can effectively distinguish fluid properties according to discriminant analysis;

[0038] e. According to the coincidence rate of each established discriminant function, two of the discriminant functions with the highest coincidence rate are selected as the x and y axes respectively to establi...

Embodiment approach

[0040] Refer to the attached figure 1 and 2 , the best implementation mode of the present invention is as follows:

[0041] 1. Combining the gas logging peak data of wells in the same block after oil testing, they are divided into different groups according to their different oil testing results.

[0042] According to the different oil test results, they are divided into different groups: according to the category of the corresponding oil test results displayed by each gas test (such as: gas layer, water layer, gas-water layer, etc.), each display peak data Carry out grouping, taking gas-water discrimination as an example, group the peak data of the gas test display corresponding to the gas layer as the result of the oil test into one group, and group the peak data of the gas test display corresponding to the same layer of gas and water as the result of the oil test into two groups, and so on.

[0043] 2. Establish discriminant factors based on the gas measurement values ​​...

Embodiment 3

[0057] Following is the specific application process of the present invention:

[0058] 1. Collect the peak value data and oil testing result data of wells in the same block after oil testing.

[0059] 2. According to the oil test results, group the peak data of each mud logging display with the same oil test result category.

[0060] 3. Optimizing the discriminant factor that can more effectively reflect the properties of the reservoir fluid.

[0061] 4. Using discriminant analysis to establish multiple discriminant functions that can effectively distinguish fluid properties .

[0062] 5. According to the coincidence rate of each discriminant function established, two of the discriminant functions with the highest coincidence rate are selected as the x and y axes respectively to establish the gas survey chart.

[0063] In practice, in order to establish a gas survey chart with a higher coincidence rate, it may be necessary to select discriminant factors multiple times, es...

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Abstract

The invention discloses a method for discriminating reservoir fluid by establishing a gas logging chart on the basis of discriminant analysis, relating to the technical field of oil and gas exploitation and development. The method includes the steps of: a, collecting the gas logging peak value data and the oil test results in an oil test completion well; b, according to the categories of the oil test results, grouping the gas logging peak value data of the logging display sections which have the same category of oil test results; c, establishing discrimination factors by taking the gas logging peak value data of the logging display sections as a base; d, selecting the established discrimination factors, and formulating discrimination functions which can effectively discriminate the property of the fluid on the basis of discriminant analysis; and e, according to the coincidence rates of the formulated discrimination functions, preferentially selecting two discrimination functions with the highest coincidence rates to be used as x axis and y axis to establish a gas logging chart to discriminate the property of the reservoir fluid. The method disclosed by the invention solves the problem that conventional gas logging charts are difficult for effectively discriminating the reservoir fluid, so the dominant regions of different fluids can be well marked out.

Description

[0001] technical field [0002] The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a method for judging reservoir fluid by using discriminant analysis to establish a gas survey chart. Background technique [0003] In the process of natural gas exploration and development, gas survey chart is an important means to understand the properties of reservoir fluid. Specifically, the gas survey chart is a two-dimensional fluid discrimination system, which needs to use two fluid discrimination parameters to establish a two-dimensional chart. [0004] The publication number is CN102562051A, and the Chinese patent document whose disclosure date is July 11, 2012 discloses a method for processing raw data of gas survey charts, comprising the following steps: a method for processing raw data of gas survey charts, comprising the following steps: Step a. Obtain the logging gas measurement value and oil testing result of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 唐谢唐家琼庞江平崔健魏阳庆杨琳邓月锐曹玉
Owner BC P INC CHINA NAT PETROLEUM CORP
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