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High resolution P- and S-wave velocity and attenuation models for the SAFOD site from visco-elastic full seismic waveform inversion of the SAFOD-2003 data

根据 SAFOD-2003 数据的粘弹性全地震波形反演得出的 SAFOD 站点的高分辨率纵波和横波速度和衰减模型

基本信息

批准号：
252325967
负责人：
Professor Dr. Florian Bleibinhaus
金额：
--
依托单位：
Lehrstuhl für Angewandte Geophysik
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/252325967?language=en
关键词：
resolution wave velocity attenuation models

项目摘要

This study applies Visco-Elastic (VE) Full Waveform Inversion (FWI) to active-source seismic data acquired in 2003 across the San-Andreas-Fault (SAF) at the site of the SAFOD drill-hole. FWI is a tomographic technique to improve the resolution of seismic travel-time models by inverting full seismograms. In contrast to acoustic implementations, fully-elastic FWI is adapted to cope with high impedance contrasts, and it provides P- and S-wave velocity models at high resolution.Increasing the resolution of the seismic models generally aims at a more detailed site characterization. The goal is to improve the connection between the models and the localized borehole information in order to better determine the spatial extent of the downhole observations. Specifically, imaging the low-velocity-zones below the Salinian granite is one of the primary goals, including a thin damage zone that accommodates the combined motion of fault creep and microseismicity. The ability to image this zone is of utmost importance for a seismic study of the SAF. In addition, the high-resolution seismic models have the potential to detect over-pressured or other anomalous zones that are of tectonophysical importance. The models from this study can also be of future use, e.g., for reverse time migration of the active-source reflection data.

本研究将粘弹性（VE）全波形反演（FWI）应用于2003年在SAFOD钻井现场的圣安德烈斯断层（SAF）上获得的有源地震数据。FWI是一种通过反演全地震记录来提高地震走时模型分辨率的层析成像技术。与声学实现相比，全弹性FWI适用于高阻抗对比，并提供高分辨率的P波和s波速度模型。提高地震模型的分辨率通常是为了更详细地描述现场特征。目的是改善模型与局部井眼信息之间的联系，以便更好地确定井下观测的空间范围。具体来说，对盐系花岗岩下方的低速带进行成像是主要目标之一，包括一个容纳断层蠕变和微震活动联合运动的薄损伤带。该区域的成像能力对于SAF的地震研究至关重要。此外，高分辨率地震模型具有探测超压带或其他构造物理异常带的潜力。本研究的模型也可用于未来，例如，用于有源反射数据的逆时偏移。