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Methods to identify the origin of natural gas

A technology of natural gas and origin, applied in the field of oil and gas exploration, can solve the problem of not being able to further know which oil layer the natural gas comes from, and achieve the effect of facilitating exploration and development

Active Publication Date: 2021-08-03
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] When identifying the origin of natural gas in an oil field that includes multiple oil layers, if it is known that the natural gas originates from the oil layer through the isotope map, it is impossible to further know which oil layer the natural gas comes from

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  • Methods to identify the origin of natural gas
  • Methods to identify the origin of natural gas
  • Methods to identify the origin of natural gas

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Embodiment Construction

[0031] Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art. In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] Embodiments of the present invention provide a method for identifying the cause of natural gas, the method comprising:

[0033] Collect crude oil samples and obtain C in crude oil samples 10 h 22 Previous carbon isotope data for hydrocarbon components.

[0034] Collect natural gas samples and obtain C in natural gas samples 5 h 12 Carbon isotope data for subsequent hydrocarbon components.

[0035] If the difference between the carbon isotope data corresponding to the natural gas sample and the carbon isotope data corresponding to the crude oil sample is les...

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Abstract

The invention discloses a method for identifying the origin of natural gas, and belongs to the field of oil and gas exploration. The method includes: collecting a crude oil sample, and obtaining C in the crude oil sample 10 H 22 Carbon isotope data for previous hydrocarbon components; taking a natural gas sample to obtain the C in the natural gas sample 5 H 12 Carbon isotope data for later hydrocarbon components. Compare the carbon isotope data corresponding to the natural gas sample with the carbon isotope data corresponding to the crude oil sample; if the difference between the carbon isotope data corresponding to the natural gas sample and the carbon isotope data corresponding to the crude oil sample is less than or equal to 5 ‰, it is determined that the natural gas sample has a relationship with the crude oil sample. Through the comparison of the carbon isotope data in crude oil and natural gas, the invention can directly obtain the relationship between crude oil and natural gas, not only can determine whether the natural gas is oil-type gas, but also can accurately determine the genetic source of natural gas to a certain oil layer, which is beneficial to natural gas exploration and development.

Description

technical field [0001] The invention relates to the field of oil and gas exploration, in particular to a method for identifying the origin of natural gas. Background technique [0002] The identification of the genetic type of natural gas is of great significance for clarifying the origin and source of natural gas, guiding natural gas exploration, and promoting the rapid development of the natural gas industry. Therefore, it is necessary to provide a method to identify the origin of natural gas. [0003] In the existing technology, the carbon isotope data and hydrogen isotope data in natural gas are measured, and then compared with the isotope plate to judge whether the type of natural gas is oil-type gas, coal bed methane or biogas, etc., and the cause of natural gas can be judged to be from oil reservoirs , coal seams or microorganisms. [0004] The inventor finds that the prior art has at least the following problems: [0005] When identifying the origin of natural gas...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01V9/00
CPCG01N30/02G01N2030/025G01V9/007
Inventor 王雪司万霞蒙启安徐春龙董忠良刘婷张利裴源
Owner PETROCHINA CO LTD