Microstructural Properties of gas hydrates from the Mallik well

Mallik 井天然气水合物的微观结构特性

• 批准号: 5423188
• 负责人: Professor Dr. Werner F. Kuhs
• 金额: --
• 依托单位: Geowissenschaftliches Zentrum (GZG)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5423188?language=en
• 关键词: Microstructural; Properties; gas; hydrates; Mallik

The Mallik 5L-38 gas hydrate research well was designed as a field experiment to test the physical response of gas hydrate deposit to various advanced production methods. Likewise it was used as a test for various advanced logging methods. There is accumulated evidence that the microstructure of gas hydrates plays an important role in both areas. Using cryo scanning electron microscopy we have revealed in an exploratory study the sub-micron porosity of some of the Mallik gas hydrates which are likely to affect the seismic response as well as the decomposition kinetics. The sub-micron pores are likely to be filled with gas and may be at the origin of the so-called "blanking effect" with anomalously low seismic reflections. Here we propose a detailed quantitative investigation of the sub-micron structures of Mallik gas hydrates. The goal will be the development a model of sub-micron porous gas hydrates which is suitable for an effective medium modeling. Based on our previous laboratory experiments we also expect some further insight into compositional variations as well as into the presently unknown formation process from accompanying Raman spectroscopy and diffraction studies.

Mallik 5L-38天然气水合物研究井设计为现场实验，以测试天然气水合物存款对各种先进生产方法的物理响应。同样，它也被用来测试各种先进的测井方法。越来越多的证据表明，天然气水合物的微观结构在这两个领域都起着重要的作用。使用低温扫描电子显微镜，我们已经揭示了在一项探索性研究的亚微米孔隙度的一些Mallik天然气水合物，这可能会影响地震响应以及分解动力学。亚微米孔隙很可能充满气体，可能是所谓的“空白效应”的起源，地震反射非常低。在这里，我们提出了一个详细的定量调查的亚微米结构的Mallik天然气水合物。我们的目标将是发展一个亚微米多孔气体水合物的模型，这是适合于一个有效的介质模拟。根据我们以前的实验室实验，我们还期望一些进一步的洞察成分的变化，以及到目前未知的形成过程，从伴随的拉曼光谱和衍射研究。