刘伟^1,2,,
张剑锋^1,2,,
1. 中国科学院地质与地球物理研究所, 中国科学院油气资源研究重点实验室, 北京 100029
2. 中国科学院大学, 北京 100049

基金项目: 国家自然科学基金重点项目（41330316）和国家科技重大专项（2017ZX05008-007）资助


详细信息

作者简介: 刘伟, 男, 1990年生, 中国科学院地质与地球物理研究所博士研究生, 主要从事高性能计算与地震成像方法研究.E-mail:geoliuwei@gmail.com

通讯作者: 张剑锋, 男, 1963年生, 中国科学院地质与地球物理研究所研究员, 主要从事地震波数值模拟, 地震偏移成像, 地震波场重建及地震资料处理等.E-mail:zhangjf@mail.iggcas.ac.cn

中图分类号: P631

收稿日期:2017-02-13
修回日期:2017-11-22
上线日期:2018-02-05

De-absorption prestack time migration: steep dip structure imaging and its application

LIU Wei^1,2,,
ZHANG JianFeng^1,2,,
1. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2. University of Chinese Academy of Sciences, Beijing 100049, China


More Information

Corresponding author: ZHANG JianFeng,E-mail:zhangjf@mail.iggcas.ac.cn

MSC: P631

--> Received Date: 13 February 2017
Revised Date: 22 November 2017
Available Online: 05 February 2018


摘要
摘要:黏弹性叠前时间偏移通过在偏移过程中补偿地球介质的吸收衰减，恢复被衰减的高频成分，进而获得较常规叠前时间偏移更高分辨率的偏移成像结果.相比于常规叠前时间偏移，该方法实现环节包含的频率域积分产生的巨大计算量，需要基于GPU加速实现才能满足工业应用对其计算效率的需求.本文针对黏弹性叠前时间偏移算法实现的这一特点，提出了修正其走时计算方法精度和应用分时段的频率域成像策略，在进一步提升计算效率的同时，改进了该方法对陡倾角构造和断层的成像效果.我们将改进的黏弹性叠前时间偏移方法应用于三维陆上地震资料，与现行的商业偏移软件对比表明，该方法不仅获得了更高分辨率的成像结果，也实现了对断层和陡倾角构造的清晰成像，而新方法的计算耗时也较改进前减少了三分之一以上.
关键词: 黏弹性/
叠前时间偏移/
陡倾角/
走时/
计算效率

Abstract:De-absorption pre-stack time migration (PSTM) can compensate absorption and dispersion via an actual wave propagation path using effective Q parameters. Compared with conventional pre-stack time migration, it has higher resolution image. In this paper, we modified the conventional travel time method to a high order one by introducing two non-dimensional parameters. These parameters are obtained by optimizing the travel time equation and the travel time calculated using the Snell's law. To improve the robustness of imaging steep-dip structure and faults, we present a new travel time calculation method useful for graphic process unit (GPU) and a seismic trace split method. Applying the method to the real 3D land seismic data produces significant improvements in resolution especially in steep-dip structure and faults. At the same time, the improved method can reduce the calculation time by more than one third.
Key words:Viscoelastic media/
Pre-stack time migration/
Steep dip structure/
Travel time/
GPU speed up



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