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Method for determining content of biological silicon in sedimentary rock

A technology of sedimentary rock and bio-silicon, which is applied in the field of petroleum geology research, can solve problems such as difficulty in extraction, and achieve the effect of reducing measurement errors

Pending Publication Date: 2020-11-24
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The current methods for determining biosilicon are mainly for marine or lake sediments, which have not undergone diagenetic evolution and are relatively easy to extract, while sedimentary rocks have undergone a long period of sedimentary diagenesis and stratigraphic evolution, and contain a large amount of siliceous components in sedimentary rocks. Including fine-grained low-metamorphic rocks, breaking of coarse particles during weathering, abrasion during transportation, clay diagenesis, and biogenic bio-silicon. Extraction is relatively difficult, and there is no relevant method for the determination of bio-silicon in sedimentary rocks

Method used

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  • Method for determining content of biological silicon in sedimentary rock
  • Method for determining content of biological silicon in sedimentary rock
  • Method for determining content of biological silicon in sedimentary rock

Examples

Experimental program
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Embodiment 1

[0041] This embodiment provides a method and measurement results for determining the biosilicon content of the low-evolution sample NJ-1.

[0042] 1. Sample grinding

[0043] Use a plastic brush to remove the surface attachments of the sedimentary rock NJ-1, clean the agate mortar with water and alcohol, put a small piece of NJ-1 sample, and grind it manually until the particle size is ≤200 mesh.

[0044] 2. Put the ground sample into a sample bottle, dry it at 60°C for 24 hours, take it out and store it in a desiccator.

[0045] 3. Weigh 75 mg of the sample into a 50 mL polyethylene centrifuge tube, add 5 mL of 1 mol / L hydrochloric acid solution into the centrifuge tube, and let it stand for 2 hours until the reaction is complete to remove carbonates. After the reaction was complete, 20 mL of water was added, centrifuged at 3000 rpm for 5 min in a centrifuge, and the supernatant was removed.

[0046] 4. Add 5mL of 10% hydrogen peroxide solution and let stand overnight to re...

Embodiment 2

[0058] This embodiment provides a method and measurement results for determining the biosilicon content of the highly evolved sample YJC-0, and the determination method is the same as that in Example 1.

[0059] Table 2 shows the results of the extraction experiment of the highly evolved sample YJC-0. It can be seen from Table 2 that the contents of Si, Al, and Ti in the extraction solution are all low, and the Al content is 10%-25% of the Si content, that is to say Abiotic silicon or higher silicon from clay minerals must be corrected for abiotic silicon. figure 2 It shows the relationship diagram of Si and Al concentration changes in the YJC-0 sample extract solution of Example 2 of the present invention. from figure 2 It is found that the content of Si and Al in the extract varies close to 1:1, so it can be inferred that the ratio of non-biological silicon to Al in the sample is 1:1, and the biological silicon data can be corrected by this coefficient. pass image 3 Th...

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Abstract

The invention discloses a method for determining the content of biological silicon in sedimentary rock. The method comprises the following steps: 1) cleaning, grinding and drying sedimentary rock; 2)removing carbonates; 3) removing organic matters; 4) extracting to obtain an extracting solution; 5) performing sampling; and 6) determining the mass fraction of biological silicon. According to the method, an internal standard method is adopted for correcting the influence of the matrix effect (high-content sodium) on silicon, aluminum and titanium measurement, measurement errors are reduced, thecontent of aluminum and titanium can be used for correcting and deducting positive non-biological silicon, and the method can meet the requirement for measuring the content of biological silicon in sedimentary rock in oil and gas exploration.

Description

technical field [0001] The invention belongs to the field of petroleum geology research, and more specifically relates to a method for measuring the content of bio-silicon in sedimentary rocks, which meets the needs of measuring the content of bio-silicon in sedimentary rocks in oil and gas exploration. Background technique [0002] Silicon is abundant in the earth's crust, second only to oxygen, accounting for about 27.7%. However, silicon in nature exists in a combined state (Aston, 1983: (1) dissolved silica (DSi: dissolved silica), which is mainly HSiO silicic acid 4 form exists. (2) Silicon dioxide (silica), which mainly includes quartz (quartz) glass and opal (opal or opaline silica), etc.; (3) Silicate is the main form of silicon, such as olivine, feldspar, mica and clay minerals etc. In aquatic ecosystems, silicon is an important element that constitutes biological communities. The growth and skeleton formation of radiolarians, siliceous sponges and dinoflagellate...

Claims

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Application Information

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IPC IPC(8): G01N21/73G01N1/28
CPCG01N21/73G01N1/28
Inventor 马亮帮腾格尔卢龙飞申宝剑陈强路
Owner CHINA PETROLEUM & CHEM CORP
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