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A workflow to model anisotropy in a vertical transverse isotropic medium

机译：在垂直横向各向同性介质中建模各向异性的工作流程

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摘要

Velocity anisotropy, which is known as the directional dependency of velocities, is becoming increasingly important in subsurface imaging and characterization. Most elasticity theories consider an isotropic medium to describe the phenomena in the field of reservoir geophysics. This assumption is challenged by the reality of the subsurface which is subject to a complex geological history such as tectonic movements and changes in the differential stress that can typically introduce fractures. In some cases, these factors can make the subsurface highly anisotropic. In general, four classes of anisotropy can be defined, ranging between the two extremes of a completely isotropic medium (with two elastic constants) and a completely anisotropic medium (with 21 elastic constants). The four classes refer to specific conditions where we can reduce the number of elements of the elastic stiffness tensor. These are known as Cubic (with three independent elastic constants), Transverse Isotropic or TI (five independent elastic constants), Orthorhombic (nine independent elastic constants) and Monoclinic (13 independent elastic constants). TI is the most often used to describe sedimentary rock.
机译：速度各向异性，即速度的方向依赖性，在地下成像和表征中变得越来越重要。大多数弹性理论都将各向同性的介质描述为油藏地球物理学领域的现象。该假设受到地下现实的挑战，地下现实要经历复杂的地质历史，例如构造运动和通常会引起裂缝的压应力变化。在某些情况下，这些因素会使地下高度各向异性。通常，可以定义四类各向异性，介于完全各向同性的介质（具有两个弹性常数）和完全具有各向异性的介质（具有21个弹性常数）的两个极端之间。这四个类别是指可以减少弹性刚度张量的元素的特定条件。这些称为立方（具有三个独立的弹性常数），横观各向同性或TI（五个独立的弹性常数），正交晶（九个独立的弹性常数）和单斜晶（13个独立的弹性常数）。 TI最常用于描述沉积岩。

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