摘要：The knowledge of Q is desirable for improving seismic resolution, facilitating amplitude analysis and seismic interpretation. The most commonly used methods for Q estimation are the frequency-spectrum-based methods. Generally, these methods are based on the plane wave theory assuming that the transmission/reflection loss is frequency independent. This assumption is reasonable in the far-field situation and makes the transmission/reflection coefficient irrelevant with the Q estimation result. However, in the near-surface context, this assumption is invalid because the seismic wave propagates in the form of spherical wave in the real seismic surveys and the spherical-wave transmission/reflection coefficient is frequency dependent. As a result, deviation will exist. In this paper, the influence of the spherical-wave effect on the Q estimation in the near-surface context was proved in both synthetic data and field data for the first time, and it was found that the deviation due to the spherical-wave effect is of order comparable to the intrinsic attenuation. The compensation method based on the forward modeling is then proposed to correct this deviation, and the effectiveness of the proposed method is proved by the reasonable estimated results of both synthetic data and field data example. These results raise caution for the interpretation of the extracted Q in the near-surface context if they do not account for the spherical-wave effect and point to the necessity of incorporating a frequency-dependent term in the frequency-spectrum-based method when applied to the Q estimation in the near surface.

关键字：Spherical-wave effect Attenuation estimation Near-field Frequency-spectrum-based method

ISSN号：1895-6572

卷、期、页：卷: 67 期: 2 页: 577-587

发表日期：2019-04-01

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）,EI（工程索引）

发表期刊名称：ACTA GEOPHYSICA

通讯作者：纪永祯,闫彬鹏

第一作者：王尚旭,袁三一

论文类型：期刊论文

论文概要：纪永祯,王尚旭,袁三一,闫彬鹏，The influence of the frequency-dependent spherical-wave effect on the near-surface attenuation estimation，ACTA GEOPHYSICA，2019，卷: 67 期: 2 页: 577-587

论文题目：The influence of the frequency-dependent spherical-wave effect on the near-surface attenuation estimation