文献类型：期刊文献

中文题名：X射线计算机断层扫描测定沉积物中水合物微观分布

英文题名：Microscopic distribution of gas hydrate in sediment determined by X-ray computerized tomography

作者：李承峰[1,2];胡高伟[1];业渝光[1];刘昌岭[1];程军[3];张立凯[4];郑荣儿[2]

机构：[1]国土资源部海洋油气资源与环境地质重点实验室,山东青岛266071;[2]中国海洋大学光学光电子实验室,山东青岛266100;[3]华东理工大学机械与动力工程学院,上海200237;[4]通用电气检测控制技术,上海201203

年份：2013

卷号：24

期号：3

起止页码：551

中文期刊名：光电子．激光

外文期刊名：Journal of Optoelectronics·Laser

收录：EI(收录号：20131616213786);Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家自然科学基金(41072037;41104086);国土资源部公益性行业科研专项基金(201111026);中国地质调查局百名青年地质英才培养计划资助项目

语种：中文

中文关键词：X射线光学;微观分布;标定物;CH4水合物;生长过程

外文关键词：X-ray optics; microscopic distribution; calibration object; CH4 hydrate; formation

摘要：建立了利用X射线计算机断层成像(X-CT,X-ray computed tomography)研究天然气水合物在沉积物空隙中填充过程和赋存状况的测试系统。针对数据图像中水和水合物灰度相近不易区分的难题,采用提高密度差和添加标定物的方法对其进行改善。通过重建的二维和三维影像,可清晰地观察到自由气、沉积物、水和水合物的微观分布状态。在自行研制的可控温高压反应装置内合成CH4水合物,并对其生长过程进行了跟踪扫描。反应过程前后图像数据的对比表明,水合物最初主要在沉积物颗粒表面与气液界面处生长,随后逐渐占据大部分液相空间,最终连同所有的沉积物颗粒胶结在一起。实验结果证明,高精度X-CT应用于含水合物的沉积物样品内部结构测试以及水合物在沉积物空隙中的动力学机理研究是可行且有效的。
The gas hydrate＇s filling process and microscopic distribution in the voids of sediments are observed by X-ray computed tomography （X-CT） imaging system. A new test technology is established, aiming at the difficulty in distinguishing the hydrate from the data images of sediment. The two kinds of methods,improving the density contrast between hydrate and solution or adding a hydrate grain as the calibration object,are improved effectively and achieve good results. By the 2D and 3D images of X-CT scanning, the spatial distributions of free gas, sediment, water and hydrate could be clearly observed. Artificial ell4 hydrate is generated in the temperature-controlled high-pressure reactor and its forming process is recorded timely. The contrast of image data before and after hydrate formation shows that hy- drate firstly emerges in sediment particle surface and gas-liquid interface, then gradually occupies most of the liquid phase space,and finally along with all of the sediment particles cementing together. The results show that X-ray computed tomography applied to the internal structure test of gas hydrate sediment sample, as well as the kinetic mechanism of gas hydrate growing in the sediment is feasible and effective.