Measured temperature and pressure dependence of Vp and Vs in compacted, polycrystalline sI methane and sII methane-ethane hydrate

被引:27
作者
Helgerud, MB
Waite, WF
Kirby, SH
Nur, A
机构
[1] Stanford Univ, Dept Geophys, Stanford, CA 94305 USA
[2] US Geol Survey, Menlo Pk, CA 94025 USA
关键词
D O I
10.1139/P03-016
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report on compressional- and shear-wave-speed measurements made on compacted polycrystalline sI methane and sII methane-ethane hydrate. The gas hydrate samples are synthesized directly in the measurement apparatus by warming granulated ice to 17degreesC in the presence of a clathrate-forming gas at high pressure (methane for sI, 90.2% methane, 9.8% ethane for sII). Porosity is eliminated after hydrate synthesis by compacting the sample in the synthesis pressure vessel between a hydraulic ram and a fixed end-plug, both containing shear-wave transducers. Wave-speed measurements are made between -20 and 15degreesC and 0 to 105 MPa applied piston pressure.
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页码:47 / 53
页数:7
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