模拟天然气水合物的岩石物理特性模型实验

针对水合物沉积的悬浮、颗粒接触和胶结三种微观模式，制作一组微弱胶结非固结高孔隙度人造样品和颗粒填充渐变的三维物理模型. 通过物理模型实验研究天然气水合物物性参数的敏感性. 实验结果表明：在弱颗粒间胶结物和低有效应力的固结差的沉积物中，声波对孔隙流体性质较敏感. 随着温度的降低颗粒胶结，改变原有沉积物的岩石物理特性，速度、弹性模量和频率升高，声波衰减和Vp/VS减小，沉积层内的反射波消隐.

Experiments of physical modeling for petrophysical properties of natural gas hydrate

Based on three kinds of micro models(suspended,grain contact and cements) of hydrate sediments, we made synthetic samples of weak cementation and high porosity in unconsolidated sediments and a 3_D physical model of grains of which sizes vary gradually. With the experiments of physical modeling we study sensitivity of physical parameters of nature gas hydrate. Experiments show that the velocity of sonic waves is sensitive to pore fluid in sediments of weakly cemented or low effective pressure. As temperature decreases, cementing welds the grains, rock physical properties of the sediment change, velocity, elastic moduli and frequency increase, attenuation and Vp/Vs decrease, and seismic reflection are “blanking" in the sediment.