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Carbonatite oil and gas reservoir pyrite rubidium-strontium isotope chronology

A technology for oil and gas reservoirs and carbonate rocks, which is used in scientific instruments, material analysis by optical means, and preparation of samples for testing, etc. It can solve the problems of inability to accurately define the absolute geological age, complicated operations, and heavy workload.

Active Publication Date: 2019-12-03
YUNNAN UNIV
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Problems solved by technology

[0002] Carbonate oil and gas reservoir accumulation chronology is the frontier field of petroleum geology and geochronology research. Existing technical means cannot accurately define the absolute geological age of hydrocarbon accumulation / adjustment in carbonate rock formations, which restricts the carbon Process of Hydrocarbon Exploration in Salt Rock Formation
Rubidium-strontium isotope chronology of pyrite is a comprehensive subject based on mineralogy, isotope dilution-thermal ionization mass spectrometry, radioisotope and stable isotope analysis. However, this technology is currently only limited to high-temperature systems (such as deposit systems). It has not been applied to low-temperature hydrocarbon-bearing systems (such as carbonate oil and gas reservoirs); in addition, during the application of this technology, more than two (usually more than four) samples need to be collected in the sampling area for detection, and the operation Complicated, heavy workload, time-consuming and large errors in test results

Method used

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Embodiment 1

[0060] The method of the present embodiment comprises the following steps:

[0061] Step 1. Select the Kuqa Depression in the Tarim Basin as the research area, select Well Yudong 2 in the research area as the research well location, and collect two hand samples of carbonate rocks at 4952 meters below the well The salt rock hand specimen A and the carbonate rock hand specimen B are made of carbonate rock hand specimen A and carbonate rock hand specimen B as raw materials respectively, and then through Microscope and scanning electron microscope finely characterize the structural features of pyrite in carbonate rock slice A and carbonate rock slice B, and the results show that the pyrite crystals in carbonate rock slice A and carbonate rock slice B are uniform in Does not contain inclusions, so both carbonate rock hand specimen A and carbonate rock hand specimen B can be used as dating objects;

[0062] figure 1 It is a schematic diagram of the distribution of structural units...

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Abstract

The invention belongs to the technical field of oil and gas formation and particularly relates to carbonatite oil and gas reservoir pyrite rubidium-strontium isotope chronology. The method comprises ten steps of selection of a dating object, preparation of a sample, cleaning of the sample, drying of the sample, weighing and dissolving of the sample, drying and re-dissolving of the sample, chemicalseparation, treatment of component solutions, determination of isotopic compositions, and analysis and comparison. The carbonatite oil and gas reservoir pyrite rubidium-strontium isotope chronology in the invention is combined with an Rb-Sr chronology and research for the radioactivity and stable isotopes, and a method for determining the carbonatite reservoir oil and gas formation time is provided. According to the method disclosed by the invention, the sample amount used for single analysis is 1 / 10 to 1 / 100 the sample amount for conventional analysis, the use amount of the sample is extremely small, the sampling frequency is greatly reduced, the workload is reduced, and the analysis time is shortened.

Description

technical field [0001] The invention belongs to the technical field of oil and gas accumulation, and in particular relates to a rubidium-strontium isotope chronology method for pyrite in carbonate rock oil and gas reservoirs. Background technique [0002] Carbonate oil and gas reservoir accumulation chronology is the frontier field of petroleum geology and geochronology research. Existing technical means cannot accurately define the absolute geological age of hydrocarbon accumulation / adjustment in carbonate rock formations, which restricts the carbon The process of oil and gas exploration in salt rock formations. Rubidium-strontium isotope chronology of pyrite is a comprehensive subject based on mineralogy, isotope dilution-thermal ionization mass spectrometry, radioisotope and stable isotope analysis. However, this technology is currently only limited to high-temperature systems (such as deposit systems). It has not been applied to low-temperature hydrocarbon-bearing syste...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N21/84G01N23/2251G01N1/28G01N1/34G01N1/44G01N27/626
CPCG01N27/626G01N21/84G01N23/2251G01N1/28G01N1/286G01N1/34G01N1/44
Inventor 王选策
Owner YUNNAN UNIV
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