| Citation: |
Yun-kai Ji, Chang-ling Liu, Zhun Zhang, Qing-guo Meng, Le-le Liu, Yong-chao Zhang, Neng-you Wu, 2022. Experimental study on characteristics of pore water conversion during methane hydrates formation in unsaturated sand, China Geology, 5, 276-284. doi: 10.31035/cg2022013
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Experimental study on characteristics of pore water conversion during methane hydrates formation in unsaturated sand
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Abstract
Understanding the pore water conversion characteristics during hydrate formation in porous media is important to study the accumulation mechanism of marine gas hydrate. In this study, low-field NMR was used to study the pore water conversion characteristics during methane hydrate formation in unsaturated sand samples. Results show that the signal intensity of T2 distribution isn’t affected by sediment type and pore pressure, but is affected by temperature. The increase in the pressure of hydrogen-containing gas can cause the increase in the signal intensity of T2 distribution. The heterogeneity of pore structure is aggravated due to the hydrate formation in porous media. The water conversion rate fluctuates during the hydrate formation. The sand size affects the water conversion ratio and rate by affecting the specific surface of sand in unsaturated porous media. For the fine sand sample, the large specific surface causes a large gas-water contact area resulting in a higher water conversion rate, but causes a large water-sand contact area resulting in a low water conversion ratio (Cw=96.2%). The clay can reduce the water conversion rate and ratio, especially montmorillonite (Cw=95.8%). The crystal layer of montmorillonite affects the pore water conversion characteristics by hindering the conversion of interlayer water.
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References
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Yun-kai Ji, Chang-ling Liu, Zhun Zhang, Qing-guo Meng, Le-le Liu, Yong-chao Zhang, Neng-you Wu, 2022. Experimental study on characteristics of pore water conversion during methane hydrates formation in unsaturated sand, China Geology, 5, 276-284. doi: 10.31035/cg2022013
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Figure 1.
Schematic diagram of the experimental apparatus
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Figure 2.
Schematic diagram of the high-pressure reactor.
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Figure 3.
The relationship between the total signal intensity of T2 distribution and water weight.
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Figure 4.
The relationship between the normalization signal intensity of T2 distribution and temperature.
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Figure 5.
T2 distributions of pure water at different temperature.
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Figure 6.
The relationship between the normalization signal intensity of T2 distribution and pore pressure.
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Figure 7.
The relationship between water weight and the total signal intensity of T2 distribution.
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Figure 8.
The variation of the T2 distribution during methane hydrate formation in the fine sand sample.
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Figure 9.
The variation of the water conversion ratio and rate during methane hydrate formation in the fine sand sample.
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Figure 10.
The variation of the water conversion ratio during methane hydrate formation in the coarse and fine sand sample.
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Figure 11.
The variation of the water conversion ratio during methane hydrate formation in the coarse and clay-containing sand sample.