气体水合物合成研究进展

doi:10.13809/j.cnki.cn32-1825/te.2024.02.012

Abstract

Abstract:

The utilization of hydrate-based capture and storage of CO₂ presents a promising avenue for substantial emissions reduction, contributing significantly to achieving carbon neutrality goals and addressing climate change. This paper delves into the foundational aspects of gas hydrates, including their properties, formation mechanisms, and models, as well as hydrate synthesis within porous media and the use of molecular dynamics simulations for understanding hydrate formation. Key challenges identified in the synthesis process of gas hydrates include the limited solubility of CO₂ in porous media, which poses a significant hurdle in precisely determining the storage capacity of CO₂ hydrates. Additionally, the local structural mechanisms, particularly nucleation processes involved in gas hydrate formation, are highlighted as complex areas that warrant further investigation. The paper also evaluates the potential of coal-bearing strata, especially in high-latitude and permafrost regions, as viable underground repositories for CO₂ storage via hydrate formation. This approach not only offers a method for reducing atmospheric CO₂ levels but also leverages the unique geological characteristics of these regions to enhance the efficiency and stability of CO₂ storage. In summary, while hydrate-based CO₂ capture and storage technologies hold considerable promise for climate change mitigation, addressing the scientific and technical challenges identified in this review is crucial for advancing the field and optimizing the efficacy of this storage method.

Key words: hydrate, carbon neutralization, coal-based medium, CO₂ hydrate synthesis, research progress

CLC Number:

TE31

WU Caifang,GAO Bin,LI Qing,CHEN Zhenlong. Research progress of gas hydrate synthesis[J].Petroleum Reservoir Evaluation and Development, 2024, 14(2): 267-276.

Figures/Tables 9

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水合物类型	联结孔类型	组成结构
I型	大孔穴	由12个五边形和2个六边形组成的十四面体（5¹²6²）结构
I型	小孔穴	由12个五边形组成的十二面体（5¹²）结构
Ⅱ型	大孔穴	由12个五边形和4个六边形组成的十六面体（5¹²6⁴）结构
Ⅱ型	小孔穴	由12个五边形组成的十二面体（5¹²）结构
H型	大孔穴	由12个五边形和8个六边形组成二十面体（5¹²6⁸）结构
	中孔穴	由3个四边形、6个五边形和3个六边形组成的十二面体（4³5⁶6³）结构
	小孔穴	由12个五边形组成的十二面体（5¹²）结构

水合物类型	水合物参数
水合物类型	联结孔类型	联结孔数量	联结孔平均直径/nm	晶胞结构	晶格棱长参数/nm	晶格轴角参数/（° ）	晶胞结构式	配位数	空间群
Ⅰ型	大	6	0.433	体心立方	a=1.200	α=β=γ=90°	6（5¹²6²）·2（5¹²）·46H₂O	24	Pm3n（第223号）
Ⅰ型	小	2	0.395	体心立方	a=1.200	α=β=γ=90°	6（5¹²6²）·2（5¹²）·46H₂O	20	Pm3n（第223号）
Ⅱ型	大	8	0.473	面心立方	a=1.730	α=β=γ=90°	8（5¹²6⁴）·16（5¹²）·136H₂O	28	Pd3m（第227号）
Ⅱ型	小	16	0.391	面心立方	a=1.730	α=β=γ=90°	8（5¹²6⁴）·16（5¹²）·136H₂O	20	Pd3m（第227号）
H型	大	1	0.579	简单六方	a=1.226 c=1.017	α=β=90° γ=120°	1（5¹²6⁸）·3（5¹²）2（4³5⁶6³）·34H₂O	36	P6/mmm（第191号）
	中	2	0.404					20
	小	3	0.394					20

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