It can be seen from synthetic waveform that the influence of well-wall boundary condition on acoustic waveform is so serious that the amplitude variation of Stoneley wave fails to reflect true variation of formation permeability. 由合成波形可以看出,井壁上的边界条件对声波波形影响很大,由此产生的斯通利波的幅度变化并不完全代表地层渗透率的变化。
The plasma membrane ( PM) permeability increased reversibility in wheat roots under-1.0 MPa PEG osmotic stress after 72 hours, and the amplitude of changes in drought-resistant cultivar was more sensitive than that in the drought one. Repeated osmotic stress could cause the PM permeability irreversible injury. 经-1.0MPa聚乙二醇PEG渗透胁迫处理72h的小麦根系质膜透性可逆升高,抗旱品种(陕合6号)增幅小于干旱敏感品种(郑引1号),反复胁迫易导致质膜透性的不可逆伤害;
In the same formation pressure drop, decrease amplitude of the rock property is not a continuous function of permeability but related to distribution scope of permeability. 在同一地层压降下,岩石物性下降幅度不是渗透率的连续函数,而是与渗透率分布范围有关,高渗透率范围,岩石物性下降幅度小,低渗透率范围,岩石物性下降幅度大。
Calculations show that if the influence of wave induced seabed response is considered, the stability coefficient of coastal structures will decrease, and it is related to wave amplitude and the permeability of seabed soil. 计算表明,近海工程中考虑海床土体受到的波浪附加应力时,海床和建筑物的整体稳定安全系数将降低,降低幅度主要与海床面上的波浪压力、海床的渗透性有关。
In the case of thin mud cake, the amplitude attenuation of Stoneley wave may be applied to estimation of formation permeability, with necessary correction being done. 当泥饼层薄时,可用斯通利波的幅度衰减量来估算地层的渗透率,但要作一些必要的校正;
The lower permeability of the soil is taken, the smaller ground displacement amplitude is calculated, and the faster the displacement attenuates with distance. The influence of permeability on the calculated high frequency vibrations is more distinct than the low ones. 场地渗透系数越低,计算的地表位移幅值越小,衰减越快;频率越高,影响越明显。
For instance, the local field near the surface of the particle and the field amplitude between two particles can be enhanced or decreased by adjusting the components of radially anisotropic permeability and permittivity. 比如,通过调节材料介电常数和磁导率的径向各向异性分量,可以增强或者削弱颗粒表面附近的局域场,也可以调节颗粒间的近场电场幅度等等。
PS-wave amplitude always reflects the change of permeability both in gas cracked sandstone or in oil ( wet) cracked sandstone. 无论是裂隙型含气砂岩,还是裂隙型含油(水)砂岩,PS波振幅都能够反映出渗透率的变化。