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井孔中低声速地层横波声波时差的测定,导致了人们对地下地质体认识的重大突破。砂体中的纵横波速度取决于孔隙度的大小、砂体成分和颗粒间的接触关系以及所含流体的饱和程度。通过把速度分解为反映岩石骨架和孔隙流体压缩性的模量,可以实现对岩石性质的最佳解释。对单一成分的物质(即纯石英砂岩)仔细实验表明存在着两个简单的构成关系。第一,骨架的体积模量和骨架的剪切模量是孔隙度的简单函数。对单一岩石成分实测的骨架剪切模量与其预测值的比较可以区分砂岩和泥岩。第二,体积模量与骨架剪切模量的比为0.9,是一个与孔隙度无关的常数。用测得的速度直接转换可以得到孔隙流体的体积模量。流体饱和度的影响,在高孔隙度时是十分明显的,这一影响不仅可以将气、水分开,还可以将油水分开。这些关系已经得到了几个实例的验证,其结果令人鼓舞。在滤液浸入严重的地方。有限频率效应可以使解释复杂化。由于纵波吸收对含气饱和度十分敏感,因此衰减状况提供了进一步的信息。模量分解的潜在应用,可能是在邻近并处的振幅与炮检距关系地震学中,用于定量表示骨架剪切模量与孔隙流体模量的相对变化。
The determination of shear wave acoustic wave time difference in low sound velocity formation in well bore has led to a major breakthrough in people’s understanding of underground geological bodies. The velocity of the S-wave in the sand body depends on the size of the porosity, the contact between the sand body composition and the particles, and the degree of saturation of the contained fluid. By decomposing the velocity into a modulus that reflects the compressibility of the rock skeleton and pore fluid, the best interpretation of rock properties can be achieved. A careful examination of the single-component material (ie pure quartz sandstone) shows that there are two simple relationships. First, the bulk modulus of the framework and the shear modulus of the framework are simple functions of porosity. The comparison between the measured shear modulus of a single rock component and its predicted value distinguishes between sandstone and mudstone. Second, the ratio of bulk modulus to skeletal shear modulus is 0.9, which is a constant unrelated to porosity. The bulk modulus of the pore fluid can be obtained by directly converting at the measured velocity. The effect of fluid saturation is evident at high porosity, which affects not only gas and water but also oil and water. These relationships have been validated by several examples and the results are encouraging. In the filtrate immersed in serious places. The limited frequency effect can complicate interpretation. Since P-wave absorption is very sensitive to gas saturation, the decay conditions provide further information. The potential application of modulus decomposition may be in the seismology of the relationship between amplitude and offset near and at hand, to quantify the relative change in the shear modulus of the framework and the modulus of the pore fluid.