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Method for extracting natural gas hydrate associated authigenic carbonate rock lattice sulfate

A carbonate rock and extraction method technology, which is used in earthwork drilling, preparation of test samples, material separation, etc., can solve problems such as extremely high precision requirements and interfere with ACAS extraction precision, and achieve high extraction precision and execution cost. The effect of low and broad application prospects

Active Publication Date: 2021-07-09
GUANGZHOU MARINE GEOLOGICAL SURVEY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These factors will seriously interfere with the extraction accuracy of ACAS
In addition, since the content of ACAS in gas hydrate reservoirs is extremely low (ppm level), the accuracy of its extraction method and experimental process is extremely high, and there is currently no method for extracting ACAS associated with gas hydrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0076] The extraction method of the present embodiment comprises the following steps:

[0077] 1) Obtain authigenic carbonate rock samples associated with gas hydrate

[0078]Step a. Soak 10 g of the natural gas hydrate reservoir sample in 500 mL of pure water for 10 minutes until the natural gas reservoir sample is in a loose state, then pour it into the first geosieve with a pore size of 63 μm, and rinse the first geosieve with deionized water. The natural gas hydrate reservoir samples in the geosieve until the water flowing out from the first geosieve is clear, use a beaker to collect the samples that pass through the first geosieve, let the beaker stand until the upper aqueous solution is clear, absorb the supernatant, and retain the solid Phase substance (remaining sample 1);

[0079] Step b, pour the remaining sample 1 into the second geosieve with an aperture of 10 μm, rinse the remaining sample 1 in the second geosieve with deionized water, and press the remaining sam...

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PUM

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Abstract

The invention provides a method for extracting natural gas hydrate associated authigenic carbonate rock lattice sulfate. The extraction method can be used for extracting the authigenic carbonate rock lattice sulfate in the natural gas hydrate associated authigenic carbonate rock sample, and is simple to operate and high in extraction precision. The method can be widely applied to various technical fields in which authigenic carbonate rock lattice sulfate needs to be extracted from natural gas hydrate associated authigenic carbonate rock samples. The extracted sulfur isotope in the authigenic carbonate rock lattice sulfate can be used for indicating the sulfur isotope of seawater sulfate in the hydrate formation period or the sulfur isotope of pore water in the mineralization period, so that the formation periods of different authigenic carbonate rock minerals can be divided, and the mineralization period of the natural gas hydrate can be judged.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas geochemistry, in particular to an extraction method of authigenic carbonate rock crystal lattice sulfate associated with natural gas hydrate. Background technique [0002] Natural gas hydrate is an ice-like non-stoichiometric cage-type crystalline compound formed by hydrocarbon gases and / or small molecular gases and water molecules under low temperature and high pressure conditions. It is considered to be an alternative energy source in the 21st century. [0003] my country's South China Sea is rich in natural gas hydrate resources. According to the experience of two rounds of gas hydrate test mining that has been successfully completed in my country, we found that during the process of gas hydrate mineralization, due to the increase in the flux of ore-forming fluids such as methane, Authigenic carbonate rock minerals associated with gas hydrate will be formed in gas hydrate reservoirs, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/001G01N1/28G01N30/06G01N27/62G01N21/73
Inventor 许辰璐陆红锋刘纪勇赖佩欣匡增桂方允鑫赖洪飞萨日娜刘玲宁子杰
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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