An experimental study on microscopic characteristics of gas-bearing sediments under different gas reservoir pressures

Zhenqi Guo; Tao Liu; Lei Guo; Xiuting Su; Yan Zhang; Sanpeng Li

doi:10.1007/s13131-021-1834-y

doi: 10.1007/s13131-021-1834-y

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出版历程
- 收稿日期: 2020-08-18
- 录用日期: 2021-03-31
- 网络出版日期: 2021-09-06
- 刊出日期: 2021-10-30

An experimental study on microscopic characteristics of gas-bearing sediments under different gas reservoir pressures

Zhenqi Guo^{1, 2},
Tao Liu^{1, 2, 3
, ,},
Lei Guo⁴,
Xiuting Su³,
Yan Zhang⁵,
Sanpeng Li¹

1.
Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China
2.
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
3.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
4.
Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China
5.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

Funds: The Shandong Joint Funds of National Natural Science Foundation of China under contract No. U2006213; the Fundamental Research Funds for the Central Universities under contract No. 201962011; the Grant of Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao) under contract No. MGQNLM-KF201804.

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Corresponding author: E-mail: ltmilan@ouc.edu.cn

摘要

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Abstract: Gas-bearing sediments are widely distributed in five continents all over the world. Most of the gases exist in the soil skeleton in the form of discrete large bubbles. The existence of gas-phase may increase or decrease the strength of the soil skeleton. So far, bubbles’ structural morphology and evolution characteristics in soil skeleton lack research, and the influence of different gas reservoir pressures on bubbles are still unclear. The micro characteristics of bubbles in the same sediment sample were studied using an industrial CT scanning test system to solve these problems. Using the image processing software, the micro variation characteristics of gas-bearing sediments in gas reservoir pressure change are obtained. The results show that the number and volume of bubbles in different equivalent radius ranges will change regularly under different gas reservoir pressure. With the increase of gas reservoir pressure, the number and volume of tiny bubbles decrease. In contrast, the number and volume of large bubbles increase, and the gas content in different positions increases and occupies a dominant position, driving the reduction of pore water and soil skeleton movement.
- micro characteristics /
- CT scanning /
- gas content /
- number and volume of bubbles /
- gas reservoir pressure /
- seabed sediments

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Figure 1. Phoenix V | Tom | x Industrial CT.

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Figure 2. Operation interface of VG Studio MAX 2.1.

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Figure 3. Scanning graph of the gas sample at 2 MPa.

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Figure 4. CT scanning of a single slice and gas, liquid, and solid separation diagram (X-Y plane direction).

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Figure 5. Comparison of bubble porosity under different gas reservoir pressures (side length: 2.17 mm).

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Figure 6. Comparison of 3D images of soil skeleton from 4 MPa to 6 MPa.

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Figure 7. Three-dimensional distribution of bubbles.

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Figure 8. Apparent gas content distribution curve.

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Figure 9. Apparent water and porosity content distribution curve.

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Figure 10. Relations between bubble number and radius.

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Figure 11. Apparent gas content distribution curve under pressure at 0 MPa and 2 Mpa.

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Figure 12. Comparison of gas content changes during pressurization.

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Figure 13. Comparison of gas content changes between 2 MPa and 6 MPa.

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Figure 14. Bubble number under varied gas reservoir pressures.

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Figure 15. Bubble volume under different gas reservoir pressures.

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Table 1. Basic properties parameters of test soil

Feature parameter	Value
Water content (ω)	40.0%
Density (ρ)	2.82 g/cm³
Dry density (ρ_d)	1.95 g/cm³
Gravity specific (G_s)	2.7
Void ratio (e)	0.71
Porosity (n)	43%

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Table 2. Bubble volume of each equivalent radius range under different gas reservoir pressures (mm³)

Radius range/μm	Reservoir pressures/MPa
Radius range/μm	0	2	4	6	3
<20	0.064	0.090	0.057	0.058	0.100
20–40	0.304	0.753	0.338	0.497	0.491
40–60	0.545	1.196	0.650	0.931	0.549
60–80	1.067	1.288	1.131	1.211	0.888
80–100	2.000	1.384	1.491	1.718	1.392
100–200	22.302	7.574	8.933	10.096	9.137
200–300	24.447	5.450	11.176	9.535	11.389
300–400	16.269	7.115	10.188	13.503	11.609
400–500	12.142	6.988	9.849	9.482	9.945
>500	120.636	160.066	157.064	188.412	174.696
Summary	199.776	191.905	200.877	235.442	220.196

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文章访问数: 291
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doi: 10.1007/s13131-021-1834-y

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An experimental study on microscopic characteristics of gas-bearing sediments under different gas reservoir pressures

Corresponding author: E-mail: ltmilan@ouc.edu.cn

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