化学学报 ›› 2011, Vol. 69 ›› Issue (9): 1135-1140. 上一篇    

研究简报

石英砂中甲烷水合物稳定条件研究

孙始财*,1,2,3,业渝光2,3,刘昌岭2,3,谭允祯1,相凤奎1,3,,马燕3   

  1. (1山东科技大学土建学院 山东省土木工程防灾减灾重点实验室 青岛 266510)
    (2国土资源部海洋油气资源与环境地质重点实验室 青岛266071)
    (3青岛海洋地质研究所 青岛 266071)
  • 投稿日期:2010-08-25 修回日期:2010-11-01 发布日期:2010-12-10
  • 通讯作者: 孙始财 E-mail:qdsunsc@163.com
  • 基金资助:

    国家重点基础研究发展计划;中国海域天然气水合物资源调查评价专项项目;山东省自然科学基金

Stable Conditions for Methane Hydrate in Quartz Sand

Sun Shicai*,1,2<,3 Ye Yuguang2,3 Liu Changling2,3 Tan Yunzhen1 Xiang Fengkui1,3 Ma Yan3   

  1. (1 Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266510)
    (2 The key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao 266071)
    (3 Qingdao Institute of Marine Geology, Qingdao 266071)
  • Received:2010-08-25 Revised:2010-11-01 Published:2010-12-10
  • Contact: SUN Shicai E-mail:qdsunsc@163.com

采用不同粒径(160~200目、200~300目、300~400目、400~600目)细颗粒石英砂模拟自然界中沉积物实验合成甲烷水合物, 采用多步升温分解法测定了甲烷水合物的稳定温度-压力(p~T)条件. 结果发现细颗粒石英砂对甲烷水合物的稳定条件有明显影响, 温度最大下降1.5 K. 其中160~200目的石英砂是实验测试条件下石英砂对甲烷水合物稳定条件有无影响的分界目数. 每一种石英砂在不同的温度压力下甲烷水合物p-T数据点较为离散, 并且不同石英砂中p-T数据曲线出现交叉, 这与文献中采用规则的硅胶、玻璃球等测得的结果有所不同. 文献中测定的甲烷水合物p-T数据点温度相对于纯水中甲烷水合物p-T数据点温度向左偏移量相同.

关键词: 石英砂, 甲烷水合物, 稳定条件, 生成分解, 多步升温分解法

Methane hydrate were synthesized in fine quartz sand with different size (160~200 mesh, 200~300 mesh, 300~400 mesh, 400~600 mesh) to determine the stable temperature-pressure conditions (p-T) for methane hydrates using step-heating decomposition method. The results showed that fine particles of quartz sand significantly affect methane hydrate stable conditions, of which 160~200 mesh quartz sand is the boundary mesh one whether the p-T conditions for methane hydrate is different or not under experimental tests. The maximum temperature difference for stable conditions of methane hydrates is 1.5 K between fine quartz sand and bulk water. For each of fine particles of quartz sand, the p-T data of methane hydrates is discrete at different temperature and pressure, and p-T data curves intersected in different quartz sand. This is different with the results in the literatures simulated with silica gel or glass bead. In the literatures, the p-T data curve shifts to the left at the same extent.

Key words: quartz sand, methane hydrate, stable condition, formation and dissociation, step-heating dissociation method