论文部分内容阅读
吴如山 ,金胜汶 ,谢小碧 .广义屏传播算子及其在地震波偏移成像方面的应用 .石油地球物理勘探 ,2 0 0 1,36 (6 ) :6 5 5～ 6 6 4 广义屏传播算子 (Generalized Screen Propagator或 GSP)是一种在双域 (dual- domain)中实现的广角单程传播算子。这一方法略去了在非均匀体之间发生的交混回响 ,但是它可以正确处理包括聚焦、衍射、折射和干涉在内的各种多次前向散射现象。由于新近在这一领域中的发展 ,这种双域方法能够在强速度反差的介质中比较精确地计算大角度波的传播 ,由此我们能够在复杂地质结构中经济有效地获得高分辨图像。本文首先对在复杂结构中使用传统的 Kirchhoff方法和时—空域中的有限差分方法偏移成像的优越性和局限性进行分析 ;然后对广义屏传播算子的发展、基本原理、计算方法及其基本特性等进行介绍。在详细介绍两种广义屏传播算子 (即混合拟屏方法和广义的 Padè屏方法 )的同时 ,给出了几个二维和三维偏移成像的实例。
Wu Rushan, Jin Shengwen, Xie Xiaobi. Applications of Generalized Screen Propagation Operator and Its Application to Seismic Wave Offset Imaging. Petroleum Geophysical Prospecting, 2 0 0 1, 36 (6): 6 5 5 ~ 6 6 4 Generalized Screen Propagation The operator (Generalized Screen Propagator or GSP) is a wide-angle one-way propagation operator implemented in a dual-domain. This method omits reverberations that occur between inhomogeneous bodies, but it correctly handles the various multiple forward scatter phenomena including focusing, diffraction, refraction and interference. Due to the recent developments in this area, this dual-domain method allows for the more accurate calculation of the propagation of large-angle waves in a medium of high velocity contrast, whereby we are able to obtain high-resolution images economically and efficiently in complex geological formations. In this paper, firstly, the advantages and limitations of the traditional Kirchhoff method and the finite difference method in the spatio-temporal domain for offset imaging are analyzed. Then the development, basic principle and calculation method of generalized screen propagation operator Basic characteristics such as introduction. Two examples of two-dimensional and three-dimensional migration imaging are given in detail while introducing two kinds of generalized screen propagating operators (that is, a hybrid quasi-screen method and a generalized Padè screen method).