收稿日期: 2013-03-25
修回日期: 2013-05-29
网络出版日期: 2013-12-10
基金资助
国家自然科学基金（编号：41001038）；冻土工程国家重点实验自主研究课题（编号：SKLFSE-ZQ-23）联合资助.
Formation and Dissociation of Methane Hydrate in Different Occurrences in Sand
Received date: 2013-03-25
Revised date: 2013-05-29
Online published: 2013-12-10
为了研究不同的产状对沉积物中甲烷水合物形成和分解过程的影响，在砂土中开展了块状、层状、结核状和分散状4种不同产状甲烷水合物的形成和分解实验。实验结果表明，产状对砂土中甲烷水合物形成和分解过程的影响比较明显。在形成过程中，块状甲烷水合物的甲烷气体转化率最高，其次是层状，再次是分散状，结核状最低。分散状甲烷水合物的形成速率最快，其气体消耗速率峰值也最高；块状甲烷水合物的形成过程耗时最长，层状甲烷水合物次之，结核状甲烷水合物再次之，形成过程耗时最短的是分散状甲烷水合物。在分解过程中，块状甲烷水合物的稳定性最好，其次是层状甲烷水合物，接下来是结核状甲烷水合物，稳定性最差的是分散状甲烷水合物。
蒋观利，吴青柏，杨玉忠，展静 . 砂土中不同产状甲烷水合物形成和分解过程研究[J]. 天然气地球科学, 2013 , 24(6) : 1305 -1310 . DOI: 10.11764/j.issn.1672-1926.2013.06.1305
To study the effect of the occurrences on the formation and dissociation of methane hydrate in sediment,the formation and dissociation experiments of methane hydrate in four different occurrences in sand,including massive,layered,nodular and disseminated,were conducted.The results showed that the effect of occurrences on the formation and dissociation of methane hydrate was evident and clear.The conversion rate of methane was highest in massive,lower in layered and disseminated,lowest in nodular.The methane hydrate formed fastest in the state of disseminated whose peak of methane conversion rate was highest,too.It took relatively the longest time for massive methane hydrate to form,secondly for layered,thirdly for nodular,and shortest for disseminated.It also showed that in dissociation process,the stabilization of massive methane hydrate was the best,secondly was layered,thirdly was nodular,and the stabilization of disseminated methane hydrate was the worst.
Key words： Methane hydrate; Sand; Occurrence; Formation; Dissociation
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