COMBINED DETECTION TECHNIQUE FOF ULTRASONIC AND TIME DOMAIN REFLECTOMETRY IN GAS HYDRATE
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摘要: 首次将超声探测技术和时域反射技术集成于一个系统中,可实时探测沉积物中水合物饱和度和声学参数。进行了58个轮次的水合物生成与分解实验,超声、时域反射和温压异常3种方法所探测到的生成点、分解点吻合,这说明利用超声技术和时域反射技术联合探测沉积物中水合物的饱和度与声速是十分有效的,将有助于更好地了解含水合物沉积层的物理性质,为海洋天然气水合物的地球物理勘探和资源评价提供基础性参数。Abstract: An experimental apparatus combining ultrasonic wave detection with Time Domain Reflectome-try (TDR) was developed for the first time,and the apparatus can determine gas hydrate saturation as well as acoustic characteristics simultaneously in experimental sediments. The formation and dissociation of gas hydrate can be detected by ultrasonic,TDR and anomalies of temperature and pressure,which gave a con-sistent result in 58 experimental runs. Experimental result reveals that, the apparatus we developed can determine gas hydrate saturation and elastic velocities efficiently. The work is helpful to understand physi-cal properties of gas hydrate-bearing sediments, and it can provide fundamental parameters for the geophysical exploration and resource evaluation of marine gas hydrate.
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Key words:
- marine gas hydrate /
- ultrasonic /
- TDR /
- saturation /
- acoustic characteristics
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