Method for measuring carbon and oxygen isotope in micro-area carbonate through on-line sampling

A technology of oxygen isotopes and carbonates, which is applied in the field of oil and gas geological exploration, can solve the problems of time-consuming, laborious, low precision, and low efficiency, and achieve the effects of increasing testing speed, improving testing accuracy, and expanding types

Inactive Publication Date: 2018-04-20
PETROCHINA CO LTD
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Problems solved by technology

[0003] In the 1980s, the use of micro-drilling tools was proposed, which was time-consuming, labor-intensive, inefficient, low-precision, and not widely used.
Due to the use of vacuum purification equipment, it is necessary to reach a vacuum of 10 -5 Pa, the vacuuming time is long, the sampling procedures are cumbersome, it takes about 2 hours to take a sample data point, and the efficiency is low

Method used

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  • Method for measuring carbon and oxygen isotope in micro-area carbonate through on-line sampling
  • Method for measuring carbon and oxygen isotope in micro-area carbonate through on-line sampling
  • Method for measuring carbon and oxygen isotope in micro-area carbonate through on-line sampling

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Embodiment 1

[0033] This embodiment provides a laser micro-area carbonate on-line sampling method for carbon and oxygen isotope determination, the process flow is as follows figure 1 shown, including:

[0034] Select carbonate samples according to the core structure, prepare the selected samples into thin slices, and polish S101 on one side. Before the test, it is necessary to wipe off the glue on the sheet with absolute ethanol, and dry S102 at 105°C-110°C. The prepared slices are placed in a dedicated sample pool, and the laser equipment is activated to ablate the selected group of carbonate samples S103. generated CO 2 The gas is enriched by liquid nitrogen freezing, water trap dewatering and capillary for miscellaneous gas separation, and pure CO is selected 2 The gas enters the stable isotope mass spectrometer for measurement, and generates carbon and oxygen isotope ratio S104.

[0035] In step S102, before the test, it is necessary to wipe off the glue bonded on the sheet with ab...

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Abstract

The invention provides a method for measuring carbon and oxygen isotope in micro-area carbonate through on-line sampling. The method comprises the following steps: taking inert gas as a carrier gas, performing high-temperature corroding on a carbonate sample to generate carbon dioxide, performing enrichment, de-watering and separating on the generated carbon dioxide to obtain carbon dioxide gas, analyzing the carbon and oxygen isotope in the pure carbon dioxide, and completing the determination of the carbon and oxygen isotope in the micro-area carbonate through on-line sampling. The method requires smaller micro-area area, and higher efficiency and precision.

Description

technical field [0001] The invention relates to a method for measuring carbon and oxygen isotopes in micro-area carbonates, in particular to an on-line sampling method for measuring carbon and oxygen isotopes in micro-area carbonates, and belongs to the technical field of petroleum and natural gas geological exploration. Background technique [0002] Carbonate rock stable isotope (carbon, oxygen) analysis is an important part of carbonate rock geochemical research, and is widely used in carbonate rock oil and gas geological research. However, the conventional phosphoric acid dissolution method for carbon and oxygen isotope analysis of carbonate rocks measures the carbon and oxygen isotopes of mixed components, and cannot separately analyze the structural components of carbonate rocks (particles, mud, cement, grains, and Carbon and oxygen isotope analysis, such as biological framework, etc., are limited in the application of carbonate rock geology. Therefore, it is becoming ...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N1/28
CPCG01N27/62G01N1/28
Inventor 王永生郭庆新蒋义敏胡安平
Owner PETROCHINA CO LTD
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