岩土力学 ›› 2026, Vol. 47 ›› Issue (7): 2396-2407.doi: 10.16285/j.rsm.2025.1053CSTR: 32223.14.j.rsm.2025.1053

• 基础理论与实验研究 • 上一篇    下一篇

水合物沉积物相平衡特性与储层稳定带计算

梁金浪1, 2，朱振宇3，常静怡3，庞维新3，周家作4，张芹1， 陈盼2, 5，韦昌富2, 6   

  1. 1．桂林理工大学 土木工程学院 广西岩土力学与工程重点实验室，广西 桂林 541004；2．中国科学院武汉岩土力学研究所 岩土力学与工程安全全国重点实验室，湖北 武汉 430071；3．中海油研究总院，北京 100028；4．中国地质大学 海洋学院，湖北 武汉 430074； 5．中国科学院大学 北京 100049；6．南华大学 资源环境与安全工程学院，湖南 衡阳，421001
  • 收稿日期:2025-09-30 接受日期:2026-03-18 出版日期:2026-07-13 发布日期:2026-07-09
  • 通讯作者: 陈盼，男，1984年生，博士，副研究员，硕士生导师，主要从事多相土基础理论与工程应用方面的研究。E-mail: pchen@whrsm.ac.cn
  • 作者简介:梁金浪，男，1998年生，硕士研究生，主要从事含天然气水合物沉积物工程力学特性方面的研究。E-mail: liangjinlang@yeah.net
  • 基金资助:
    国家自然科学基金项目（No.12572463，No.12572456）；中海油研究总院科技项目（No.2023OT-KK03）；岩土力学与工程安全重点实验室项目（No.JBGS2405）。

Phase equilibrium characteristics and calculation of hydrate stability zone for hydrate-bearing sediments

LIANG Jin-lang1, 2, ZHU Zhen-yu3, CHANG Jing-yi3, PANG Wei-xin3, ZHOU Jia-zuo4, ZHANG Qin1, CHEN Pan2, 5, WEI Chang-fu2, 6   

  1. 1. Guangxi Key Laboratory of Rock and Soil Mechanics and Engineering, School of Civil and Engineering, Guilin University of Technology, Guilin, Guangxi 541004, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 3. Research Institute of CNOOC, Beijing 100028, China; 4. College of Marine Science and Technology, China University of Geosciences, Wuhan, Hubei 430074, China; 5. University of Chinese Academy of Sciences, Beijing 100049, China; 6. School of Resources Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China
  • Received:2025-09-30 Accepted:2026-03-18 Online:2026-07-13 Published:2026-07-09
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (12572463, 12572456), the Science and Technology Program of China National Offshore Oil Corporation Research Institute (2023OT-KK03) and the Research Fund Key Laboratory of Geomechanics and Geotechnical Engineering Safety (JBGS2405).

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摘要： 天然气水合物资源量评估与开发依赖于水合物稳定带分布及厚度的精准识别。基于广义相平衡理论，建立了考虑盐度、孔隙毛细效应及稳定带温度偏移量的水合物稳定带计算方法，开发了分析软件。开展了琼东南海域储层样品相平衡试验，揭示了水合物相平衡特性可用温度、压力与未合水量三维广义相平衡面统一表征。通过与成熟软件对比，验证了所建稳定带计算方法与软件的可靠性。基于样品相平衡测试与现场条件开展了水合物目标区稳定带的计算与分析，结果表明，除水深、海床温度、地温梯度、海水盐度外，沉积物有效孔隙半径及稳定带温度偏移量对稳定带底界有重要影响。忽略这两者的影响，导致目标区稳定带底界高估约77.4 m，严重影响资源量的准确评估。研究成果可为水合物资源量精准评估提供支撑。

关键词: 天然气水合物, 相平衡, 稳定带, 有效孔隙半径, 资源量

Abstract: The assessment and exploitation of natural gas hydrate resources depend on the accurate identification of the distribution and thickness of the hydrate stability zone. This study develops a calculation method for determining the hydrate reservoir stability zone, grounded in the generalized phase equilibrium theory. Furthermore, the analysis software has been developed, taking into account the effects of seawater salinity, pore capillarity, and temperature offset on the hydrate stability zone. The experimental results from reservoir samples in the Qiongdongnan sea area reveal that the phase equilibrium characteristics of hydrates can be consistently characterized by a three-dimensional generalized phase equilibrium surface, encompassing temperature, pressure, and unhydrated water content. By comparing with mature software, the reliability of the proposed stability zone calculation method and software is confirmed. Stability zone calculation and analysis are subsequently performed based on the measured sample phase equilibrium curve and field conditions. The results show that, in addition to water depth, seabed temperature, geothermal gradient, and seawater salinity, the effective pore radius of sediments and temperature offset exert a significant influence on the lower boundary of the stability zone. Failure to account for the effects of pore effective radius and temperature offset results in an overestimation of the lower boundary of the stability zone by 77.4 m within this gas hydrate target area, significantly affecting the accurate assessment of resource quantity. These findings can provide theoretical support and a data reference for predicting the stability zone and accurately assessing the resource quantity of marine natural gas hydrates.

Key words: natural gas hydrate, phase equilibrium, stable zone, effective pore radius, resource quantity

中图分类号: P 744
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