考虑水合物孔隙赋存模式演化的含水合物沉积物渗透率模型

doi:10.16285/j.rsm.2024.0416

岩土力学 ›› 2024, Vol. 45 ›› Issue (8): 2387-2396.doi: 10.16285/j.rsm.2024.0416

考虑水合物孔隙赋存模式演化的含水合物沉积物渗透率模型

黄楠^{1, 2}，朱斌^{1, 2, 3}，王路君^{1, 2, 3}

1. 浙江大学软弱土与环境土工教育部重点实验室，浙江杭州 310058；2. 浙江大学岩土工程研究所，浙江杭州 310058； 3. 浙江大学超重力研究中心，浙江杭州 310058

收稿日期:2023-09-11 接受日期:2023-11-15 出版日期:2024-08-10 发布日期:2024-08-12
通讯作者: 王路君，男，1985年生，博士，副教授，主要从事水合物沉积物力学特性和土体多相多场耦合方面的教学研究。E-mail: lujunwang@zju.edu.cn
作者简介:黄楠，男，1999年生，硕士研究生，主要从事水合物沉积物气液渗流特性方面的研究。E-mail: 22112179@zju.edu.cn
基金资助:
中央高校基本科研业务费专项资金（No. 226-2023-00083）；国家自然科学基金（No. 51988101，No. 52127815）。

A permeability model for gas hydrate-bearing sediments considering the changes in hydrate occurring habits

HUANG Nan^{1, 2}, ZHU Bin^{1, 2, 3}, WANG Lu-jun^{1, 2, 3}

1. Key Laboratory of Soft Soils and Geoenvironmental Engineering of the Ministry of Education, Zhejiang University, Hangzhou, Zhejiang 310058, China; 2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 3. Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou, Zhejiang 310058, China

Received:2023-09-11 Accepted:2023-11-15 Online:2024-08-10 Published:2024-08-12
Supported by:
This work was supported by the Fundamental Research Funds for the Central Universities (226-2023-00083) and the National Natural Science Foundation of China (51988101, 52127815).

摘要/Abstract

摘要： 含水合物沉积物（gas hydrate-bearing sediments，GHBS）的渗透率是影响水合物生成和分解过程中气液运移特性的重要因素，常被选为水合物开采性能评价的重要指标。GHBS孔隙中水合物赋存模式与饱和度的变化，往往引起GHBS渗透率显著改变，现有渗透率模型多基于单一孔隙赋存模式建立，难以考虑赋存模式变化对GHBS渗透率的影响。基于平行毛细管模型，考虑水合物赋存模式变化对GHBS孔隙结构的影响，提出水合物颗粒包裹和孔隙填充两种赋存形式共存的混合赋存模式，引入双参数逻辑函数表征水合物孔隙赋存模式随饱和度变化的特性，建立了考虑水合物孔隙赋存模式演化的GHBS渗透率模型。通过与室内试验和原位测量数据对比验证了模型的适用性。结果表明：水合物生成过程中水合物饱和度的改变易导致其赋存模式变化，影响GHBS渗透率随饱和度变化的趋势；不同生成条件下水合物赋存模式演化特性存异，演化特征体现在主要赋存模式发生转变对应的临界水合物饱和度及演化的方向与趋势上；相比于已有模型，该模型能捕捉到水合物赋存模式改变时渗透率的变化特性，对室内制备和原位GHBS渗透率测量数据均能较好预测。

关键词: 天然气水合物, 渗透率, 赋存模式, 水合物饱和度, 分析模型

Abstract: The permeability of gas hydrate-bearing sediments (GHBS) is an important factor affecting the gas-liquid transport characteristics during the processes of hydrate formation and decomposition, and is often selected as an indicator for evaluating the extraction capacity of natural gas hydrates. The changes in hydrate occurring habits and hydrate saturation in GHBS pores significantly influence GHBS permeability. Existing permeability models are mostly based on a single hydrate occurring habit, making it difficult to consider the impact of changes in hydrate occurring habits on GHBS permeability. Based on the parallel capillary tube models, considering the influence of the varying of hydrate occurring habits on pore structure of GHBS, a mixed occurring habit with grain-coating and pore-filling coexisting is proposed. A logical function with two parameters is proposed to describe how hydrate occurring habits change with saturation, and a permeability model of GHBS considering the variation of hydrate occurring habits is established. The correctness of the model is verified by comparing it with measurement data obtained from laboratory and in-situ permeability tests, and the effectiveness of the model is analyzed by comparing it with existing mathematical models. The results indicate that changes in hydrate saturation during hydrate formation usually lead to changes in hydrate occurring habits, affecting the trend of the GHBS permeability with hydrate saturation. The changes in hydrate occurring habits vary under different formation conditions, and the main characteristics of the changing process are reflected in the critical hydrate saturation corresponding to the transformation of the main occurring habit, as well as the direction and trend of changes. Compared to the existing models, this model can capture the changing characteristics of permeability when the hydrate occurring habit changes, and can better predict measurement data from both laboratory and in-situ permeability tests of GHBS.

Key words: natural gas hydrate, permeability, hydrate occurring habits, hydrate saturation, analysis model

中图分类号: TU 43

黄楠, 朱斌, 王路君, . 考虑水合物孔隙赋存模式演化的含水合物沉积物渗透率模型[J]. 岩土力学, 2024, 45(8): 2387-2396.

HUANG Nan, ZHU Bin, WANG Lu-jun, . A permeability model for gas hydrate-bearing sediments considering the changes in hydrate occurring habits[J]. Rock and Soil Mechanics, 2024, 45(8): 2387-2396.

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考虑水合物孔隙赋存模式演化的含水合物沉积物渗透率模型

A permeability model for gas hydrate-bearing sediments considering the changes in hydrate occurring habits

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