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Method for recognizing light oil reservoir and gas condensate reservoir in stratum and application

A light oil layer technology, applied in the distribution characteristics of gas logging hydrocarbon components to identify light oil and condensate gas layers in the formation, and to identify light oil layers and condensate gas layers in the formation, it can solve the problem of reliability and The research or improvement of the effect cannot be said to be sufficient, etc., to achieve the effect of improving the interpretation rate, high reliability, and simple method

Active Publication Date: 2017-12-08
CNOOC TIANJIN BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, as far as the current existing technology is concerned, the research or improvement of the reliability and effect of the method of gas logging to interpret oil and gas layers, especially for the Xihu Sag, cannot be said to be sufficient.

Method used

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  • Method for recognizing light oil reservoir and gas condensate reservoir in stratum and application
  • Method for recognizing light oil reservoir and gas condensate reservoir in stratum and application
  • Method for recognizing light oil reservoir and gas condensate reservoir in stratum and application

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no. 1 approach

[0073] In a first embodiment of the present invention, a method of identifying light oil layers and gas condensate layers in a formation is provided.

[0074] data collection

[0075] In the first embodiment, basic data collection is realized through gas logging. Step 1 is included in this embodiment, that is, obtaining a test well.

[0076] The "obtaining test wells" means that data sampling can be performed according to existing test wells, and of course, the "obtaining" also includes newly established test wells.

[0077] The present invention has no particular limitation on the specific method for establishing the test well. The establishment of test wells can be based on existing mature theories. At the same time, with the help of various instruments and equipment required, dynamic testing of downhole oil and gas is carried out for basic data collection. The basic principles or specific means of data collection are not particularly limited in the present invention, ...

no. 2 approach

[0114] In the second embodiment of the present invention, there is provided a use of the method according to in the interpretation and identification of oil and gas distribution of oil and gas reservoirs in the Xihu sag. Compared with the traditional method, the method of the present invention has a coincidence rate of 96.8% for gas logging interpretation of oil and gas layers in the geological structure of Xihu sag, which is about 10% higher than the traditional method for gas logging interpretation of oil and gas layers.

no. 3 approach

[0116] In a third embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program or instruction is stored, and when the program or instruction is executed by a processor, the following steps are implemented:

[0117] Step 1, the collection of the measured value of gas composition, the measured value of described gas composition obtains based on the following method:

[0118] Obtain a test well, and measure the gas composition of layers at different depths in the test well, and the gas composition includes C in each layer. 1 、C 2 、C 3 , iC 4 and nC 4 , and optionally iC 5 and nC 5 The percentage of content, among them, C 1 Indicates a hydrocarbon with a carbon atom of 1, C 2 Indicates hydrocarbons with 2 carbon atoms, C 3 Indicates hydrocarbons with 3 carbon atoms, iC 4 Represents a hydrocarbon with a heterogeneous structure with 4 carbon atoms, nC 4 Represents a hydrocarbon with a normal structure of 4 carbon atoms, i...

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Abstract

The invention relates to a method for recognizing a light oil reservoir and a gas condensate reservoir in a stratum and application. The method comprises the steps that firstly, a testing well is obtained, gas compositions of different depth positions in the testing well are measured, and comprise C1, C2, C3, iC4, nC4 and the percentage composition of optional iC5 and nC5 in all positions; secondly, the measuring values of the gas compositions are subject to normalization processing, and the relative contents of the gas compositions are calculated; thirdly, according to the relative content distribution data obtained through the normalization processing in the second step, a curve graph is made; fourthly, in the curve graph in the third step, a gas curve is built; fifthly, according to the contrast relation of the relative content distribution data curve and the gas curve of the compositions of gas logging of each position, the light oil reservoir and the gas condensate reservoir in the stratum are recognized. Through the method, the light oil reservoir and the gas condensate reservoir in the stratum can be effectively recognized, and the interpretation coincidence rate of the hydrocarbon reservoir can be improved.

Description

technical field [0001] The present invention relates to a method and application for identifying light oil layers and condensate gas layers in formations, in particular to a method and application for identifying light oil layers and condensate gas layers in formations based on distribution characteristics of hydrocarbon components in gas logging and mud logging. It belongs to the field of petroleum geological logging. Background technique [0002] Gas logging belongs to the surface testing technology of natural gas in oil drilling. It mainly measures and analyzes the composition and content of natural gas in drilling fluid, judges the properties of formation fluid, and indirectly evaluates the reservoir. Under normal circumstances, the abnormal amplitude of the oil layer is 3-5 times of the base value, while that of the gas layer is more than 6 times. When the abnormality of the gas measurement is found on site and is equal to or greater than the above amplitude, it can be ...

Claims

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Application Information

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IPC IPC(8): E21B49/00G01V9/00
CPCE21B49/00G01V9/00G01V9/007
Inventor 黄导武严申斌汪文基何贤科
Owner CNOOC TIANJIN BRANCH
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