天然气水合物的声学探测模拟实验

在人工岩心中进行天然气水合物的生成和分解实验,同时获取了体系的温度、压力、声学特性(Vp和Vs、幅度和频率)及含水量等参数。经研究发现,温压法、超声探测法和TDR探测法都能灵敏探测沉积物中天然气水合物的形成和分解过程。分析认为,本次实验中水合物形成速率过快,只能宏观研究水合物对沉积物声学特性的影响,建议采用长岩心进一步研究沉积物中水合物的声学特性。

ACOUSTIC INVESTIGATION EXPERIMENT ON GAS HYDRATE-BEARING ARTIFICIAL CORES

Gas hydrate has been synthesized and then decomposed in artificial cores.The temperature,pore pressure,acoustic properties(including Vp,Vs,amplitude and frequency) and water content of the sample are measured and analyzed.The result reveals that the methods we called temperature-pressure detecting method,ultrasonic detecting method and TDR detecting method are sensitive to detect gas hydrate in sediment.However,the formation rate of gas hydrate is thought to be too fast,which is not suitable to give a detailed research on acoustics of the gas hydrate bearing sediment.It is suggested that longer artificial cores should be used to study and subsequently give reasonable explanations on some intriguing phenomenan.