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构造区内P波地震资料的常规时深转换未考虑速度各向异性引起的传播时间和速度畸变。为了正确地反映深度转换过程中的各向异性,必须了解有关岩石的各向异性参数。我们对页岩特别感兴趣,因为人们知道页岩是横向各向同性的(TI),这是由其层状组成矿物的周期性薄层沉积造成的。平行层面的速度与垂直层面的速度之差可达30%以上。可对岩心和岩石露头样品进行实验室研究,但是,在实验室里模拟现场环境很困难。另外,对页岩进行实验室速度测量也很困难,因为页岩是脆性的,很容易碎裂,特别是在获取实际各向异性参数所必需的饱和状态下。
The conventional time-depth conversion of P-wave seismic data in the tectonic zone did not consider the propagation time and velocity distortion caused by velocity anisotropy. In order to correctly reflect the anisotropy in the depth conversion process, it is necessary to know the anisotropy parameters of the rock. We are particularly interested in shale because shales are known to be transversely isotropic (TI) due to the periodic thin-layer deposition of their layered minerals. The difference between the speed of the parallel plane and the speed of the vertical plane can reach more than 30%. Laboratory studies of core and rock outcrop samples can be performed, however, it is difficult to simulate the field environment in the laboratory. In addition, laboratory velocity measurements on shales are also difficult because shale is brittle and easily fractured, especially under the conditions of saturation necessary to obtain the actual anisotropy parameters.