【摘要】 对叠前时间偏移的基本概念、实现方法进行了分类和阐述。从实现目标来说,叠前时间偏移方法主要分为两类,即用于准确构造成像的叠前时间偏移和振幅保持叠前时间偏移。每一类方法都有两种实现方式:Kirch-hoff型和波动方程型。对这些叠前时间偏移实现方法的原理和特点进行了比较详细的论述。同时指出,叠前时间偏移和深度偏移的联合应用,能够起到优势互补的作用,是叠前时间偏移在实际应用中的发展方向;而叠前配套技术的研究和更好适应不同观测系统的全三维、高精度、振幅保待叠前时间偏移方法,是地震叠前时间成像研究领域的发展方向。更多还原

【Abstract】 This paper reviewed the concepts of prestack time migrat on and its realizations. Prestack time migrationcan be roughly divided into two: structure-oriented and amplitude-preserved. For each prestack time migration,two realizations: Kirchhoff migration or wave equation migration, can be implemented. We discussed in detail theprinciples and advantages of each realizations, and pointed out that joint application of prestack time migrationand depth migration was a trend in practice because they in essence are complementary. The study of prestacksupport tools and prestack time migration of full 3-D, high-resolution, and amplitude-preserved that is applicablefor different layouts are the future direction of prestack time mig: ation.更多还原