论文部分内容阅读
由于地层的各向异性与黏滞性,地震波在传播过程中表现出方向上的各向异性和振幅值的吸收衰减特征.若简单地将地下介质视为各向同性,实际地质结构的地震波响应可能会被曲解,甚至忽略了有效信息.为了得到深部储层的高精度成像,本文将标准线性固体模型(SLS)扩展到各向异性介质中,并结合各向异性拟声波方程,推导出时间空间域的各向异性介质黏声波方程组,该方程中用伪微分算子来表述地震波的衰减特征.在逆时偏移的过程中,为了解决高频不稳定问题,文中通过引入规则化算子来构建稳定的逆时传播算子.模型的正演模拟表明该方程既能准确的描述各向异性介质下的标量波的传播规律,又能体现地层的吸收衰减效应.
Due to the anisotropy and viscosity of the strata, the seismic waves show the directional anisotropy and amplitude attenuation absorption characteristics during propagation.If the underground medium is simply regarded as isotropic, the seismic response of the actual geological structure May be misinterpreted, even ignoring the effective information.In order to obtain the high-resolution imaging of deep reservoirs, this paper extends the SLS to anisotropic media and combines the anisotropic pseudo-acoustic equations to derive time In this equation, we use the pseudo-differential operator to describe the attenuation characteristics of seismic waves.In order to solve the problem of high frequency instability in the process of inverse time migration, To build a stable counter-propagating operator.The forward modeling of the model shows that the equation can not only accurately describe the propagation law of scalar waves under anisotropic media, but also reflect the absorption attenuation effect of the formation.