摘要：Spherical-wave reflection coefficient (SRC) describes the seismic wave reflection more precisely and realistically than the plane-wave reflection coefficient (PRC). This study mainly focuses on the frequency-dependent characteristics of SRC, which are usually not considered. To better understand the reflection mechanism of spherical waves, we systematically investigate the frequency-dependent characteristics of SRC (P-wave only) in a two-layer elastic medium model with a planar interface. We use the classical Sommerfeld integral to construct the SRC and compute it with adaptive Gauss-Kronrod quadrature. Numerical simulations show that for different media with various properties, the frequency-dependence of SRC exhibits very complicated responses. Significant deviations between SRC and PRC are observed at low frequencies. Especially when the PRC is zero, the corresponding SRC is non-zero; with increasing frequency, the phase of the SRC approaches +90° or -90°, meaning a 90° phase rotation after reflection. Tests on Class 1-4 AVO models suggest that large discrepancy between SRC and PRC exists in the vicinity of the critical angle and at low frequencies.
© 2016, Science Press. All right reserved.

ISSN号：0001-5733

卷、期、页：v 59,n 10,p3810-3819

发表日期：2016-10-01

影响因子：0.000000

收录情况：SCIE（科学引文索引网络版）,ESI（基本科学指标数据库）

发表期刊名称：Acta Geophysica Sinica

参与作者：王静波

通讯作者：李京南

第一作者：王尚旭,董春晖,袁三一

论文类型：期刊论文

论文概要：李京南,王尚旭,董春晖,袁三一,王静波，Study on frequency-dependent characteristics of spherical-wave PP reflection coefficient，Acta Geophysica Sinica，2016，v 59,n 10,p3810-3819

论文题目：Study on frequency-dependent characteristics of spherical-wave PP reflection coefficient