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Re-Os isotope analysis method for oil and gas system organic matter research

A technology of organic matter and isotopes, applied in the field of oil and gas system research, which can solve problems such as weak research and application

Inactive Publication Date: 2017-02-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current Re-Os correlation dating analysis technology is mainly used in the dating analysis of medium and low evolution crude oil, and the research and application in the analysis of high evolution source rock and reservoir bitumen are still relatively weak

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] 1) Sample pretreatment: Take 35g of shale, wash and dry with deionized water, then wash and dry with dichloromethane, and grind to 200 mesh with a mortar. Weigh 0.8 g of ground shale into a Carlos tube, and put the Carlos tube into a mixed solution of dry ice and ethanol. Add an appropriate amount of isotopic diluent to the Carlos tube (use ICP-MS to analyze the rough Re content in the sample before analyzing the Re-Os isotope, determine the amount of the sample to be tested, and then determine the amount of diluent added) and 8ml of CrO 3 -H 2 SO 4 solution (0.25g CrO 3 Dissolve in 1mL of 2mol / L sulfuric acid). When the solution was frozen into a solid, the Carlos tube was closed with an oxyhydrogen flame. After the Carlos tube returned to room temperature, it was placed in a steel jacket and placed in an oven. Heat the Carlos tube step by step, set 50°C for the first time to make it heat up automatically, set it to 130°C after 30 minutes (heating time at 50°C is ...

Embodiment 2

[0078] Get the shale of the same batch as Example 1 and test, the difference between the operation process and Example 1 is: the CrO in step 1) 3 -H 2 SO 4 Solution change to HCl and HNO 3 solution (HCl 3ml with HNO 3 6ml), the data results show that embodiment 1 is more effective.

[0079] The Re-Os elements of shale exist in two parts: the organic component and the inorganic clastic component. The presence of Re-Os elements in organic components can more truly reflect the age of shale. There is a certain deviation in the measurement results between the above-mentioned Example 1 and Example 2. The CrO used in embodiment 1 3 -H 2 SO 4 Mainly dissolved in the organic component, therefore, the obtained result is closer to the true value in the organic matter in the shale; And in embodiment 2, HCl-HNO 3 In addition to dissolving Re-Os in the organic component, a small amount of Re-Os in the inorganic debris component will also be dissolved, so there is a certain deviati...

Embodiment 3

[0081]1) Sample pretreatment: The reservoir asphalt was taken out from the reservoir rocks according to conventional methods, washed with deionized water and dried, and then cleaned with absolute ethanol and dried. Weigh 0.5g of the reservoir asphalt sample, use a mortar to grind to about 2mm particle size, and set aside. Weigh 80 mg of ground reservoir bitumen into a Carlos tube, and put the Carlos tube into a mixed solution of dry ice and ethanol. Add isotope diluent to the Carlos tube (use ICP-MS to analyze the rough Re content in the sample before analyzing the Re-Os isotope, determine the usage amount of the sample to be tested, and then determine the addition amount of the diluent), 3ml hydrochloric acid (12mol / L) and 6ml nitric acid (16mol / L). When the solution was frozen into a solid, the Carlos tube was closed with an oxyhydrogen flame. After the Carlos tube returned to room temperature, it was placed in a steel jacket and placed in an oven. Heat the Carlos tube s...

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Abstract

The invention belongs to the field of oil-gas-bearing system research and particularly provides a Re-Os isotope analysis method for oil and gas system organic matter research. The method includes the following steps of sample pretreatment, Re-Os separation, Re purification, Os purification and Re and Os isotope detection. A sample is high-evolution organic matter, preferably high-evolution organic-matter-rich sedimentary rock or high-evolution formation asphalt. The method is especially suitable for hydrocarbon source comparison and reservoir forming geochronology research under the organic matter high-evolution condition. According to the method, the high-evolution organic matter sample is fully dissolved, Re and Os elements are effectively separated and purified, accurate Re-Os isotope data of the high-evolution sample is acquired, the reservoir forming geochronology and hydrocarbon sources are determined based on the data, and a reference basis is provided for finding out the formation process of natural gas reservoirs or fossil oil reservoirs or other oil and gas systems and guiding exploration.

Description

technical field [0001] The present invention relates to the field of oil-gas system research, in particular to a Re-Os isotope analysis method for organic matter research in oil-gas systems, and more specifically to the application of the Re-Os isotope analysis method in hydrocarbon source correlation and accumulation age research applications, especially under high evolution conditions. Background technique [0002] At present, the correlation of organic matter hydrocarbon sources and the study of accumulation age have become two important research directions in the study of petroleum systems. By determining the hydrocarbon source and formation age of oil and gas, the formation and evolution process of petroleum systems can be determined, which provides a basis for oil and gas research and development. Exploration provides a reference basis. [0003] Organic source correlation refers to the correlation between hydrocarbons (such as oil, gas and reservoir bitumen, etc.) and...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N1/38G01N1/34G01N1/44G01N1/42G01N1/28
CPCG01N1/286G01N1/34G01N1/38G01N1/42G01N1/44G01N27/62G01N2001/386G01N2001/2866
Inventor 曹剑施春华胡文瑄王小林
Owner NANJING UNIV
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