增强地震数据质量的非CMP叠加技术  

Seismic data enhancement with stacking method beyond CMP

作　　者：刘国华[1,2] 李庆春[1,2] 周学明[3] 

机构地区：[1]长安大学地质工程与测绘学院地球物理系,西安710054 [2]长安大学西部矿产资源与地质工程教育部重点实验室,西安710054 [3]铁道第三勘察设计院集团有限公司,天津300142

出　　处：《地球物理学进展》2011年第4期1372-1377,共6页Progress in Geophysics

基　　金：国家自然科学基金面上项目(41074089);国家高技术研究发展计划"863"课题(2007AA06Z103);西部交通项目(200731881262);长安大学中央高校基本科研业务费专项资金(CHD2010JC087)联合资助

摘　　要：阐述一种增强地震数据质量的非CMP叠加技术——零偏移距共反射面(ZO CRS)叠加.文章从分析目前模拟零偏移距(ZO)剖面常规方法存在的问题与ZO CRS叠加方法所具有的优势入手,介绍了ZO CRS叠加基本原理及其实现过程.利用2D人工合成理论模型数据对这种方法进行了验证并将其应用于低覆盖次数陆地实际资料.理论模型及实际资料试算结果显示了ZO CRS叠加方法在噪音环境中的稳健性,表明ZO CRS叠加可通过增加地震数据覆盖资料来改善模拟ZO剖面质量,提高地震数据信噪比,增强地震反射同相轴连续性,是一种非常有发展前景的地震成像方法.This paper introduces the zero-offset （ZO） common-reflection-surface （CRS） stacking technology which is a seismic data stacking method beyond CMP to enhance the quality of seismic data. Stacked sections are almost always the first available interpretable images of the subsurface, so the construction of stacked sections remains an important step within the seismic processing flow and stacked sections are standard deliverables in the industry. This paper analyzed the shortcoming of conventional methods of zero-offset （ZO） section simulation and presents the strongpoint of ZO CRS stack. This paper also describes the theory of ZO CRS stack and introduced the workflow of seismic data processing with ZO CRS stack. We applied the ZO CRS stack to a 2D synthetic dataset to verify this method and applied it to a 2D low fold land real dataset. Application of ZO CRS stack on the synthetic example and real seismic dataset shows that the ZO CRS stack is robust in the presence of noise. This technique can improve the resulting stacked section and the signal-to-noise ratio by increasing fold and this method can also enhance the consistence of seismic reflection event. The results reveal that the ZO CRS stack is a promising seismic imaging method of zero-offset section simulation.

关 键 词：地震数据 信噪比 零偏移距 共反射面叠加 

分 类 号：P631[天文地球—地质矿产勘探]