摘要
勘探表明天然气水合物多产出于细碎屑沉积物中, 其分布和赋存形式受温度、压力、水化学条件等多种物理化学因素的影响。前人的实验研究表明不同孔径尺度中的甲烷水合物稳定性有别于块状、层状水合物, 同时孔隙表面的润湿性也是影响因素之一。在综合分析前人研究成果的基础上, 系统阐述了孔隙的孔径、孔隙内表面润湿性对所含天然气水合物稳定性的影响规律, 总结了可能的内在机理; 并指出了当前应当尽快建立包括空间效应、温度、压力和组分等因素的综合天然气水合物相图, 查明含天然气水合物沉积物的孔隙结构和表界面特征, 建立天然气水合物的稳定性模型, 将有助于精确预测天然气水合物的分布和规模, 对于水合物开发和甲烷存储技术的研发也有着重要的意义。
It is proved by the long-term exploration that natural gas hydrate generally occurs within fine-grained sediments, and its stability is controlled by a number of physical, chemical and geological factors, such as temperature, pressure, pore water composition, and so on. Recent experimental studies have shown that the stability of gas hydrate in pore space with various pore structures is distinguished evidently from that of bulk one. Pore structures of host sediments significantly affect the formation and dissociation of gas hydrate, as well as wettability of pore surface. We summarize the latest experiments reported in literatures and discuss the possible influence mechanism of pore structure and wettability of inner surfaces on the stability of gas hydrates confined in pores. It is proposed that establishing an integrated thermodynamics model of methane hydrates in pore spaces with various radii, and investigating the pore structure and surface properties of hydrate-bearing sediments would advance the prediction, exploration and evaluation of gas hydrate resources. At the same time, it is of importance for methane storage and transportation.
出处
《现代地质》
CAS
CSCD
北大核心
2005年第1期89-95,共7页
Geoscience
基金
国家自然科学基金项目 (40372024)
国家"863"计划课题 (2003AA611020 /02)。
关键词
天然气水合物
孔径结构
稳定性
表界面
gas hydrate
pore structure
stability
surface and interface
