“西气东输”线路勘察中的反射波法及其应用效果

Reflection approach used in pipeline survey for the West-to-East gas transmission project and its application effects

反射波法地震勘探以其采集丰富的地下信息、高分辨率等诸多优点在工程勘察中得到广泛应用。该文结合"西气东输"线路勘察的工程实例,介绍了地震反射波法方法原理与技术,着重突出数据处理的重要性;分析对比了不同参数与方法对处理剖面的影响,确定了地震反射波法资料处理的主要方法和基本流程,特别加强对各CMP道集的速度分析,得到清晰的反射剖面,并给出了综合地层和速度的反射波解释剖面,为工程可行性研究和设计工作提供详细的地质资料和设计参数,取得了良好的勘探效果。

Seismic reflection approach has been widely used in engineering survey for the advantages such as gathering rich underground information and high-resolution. Taking the pipeline survey for the West-to- East gas transmission project as an example,the principles and techniques of seismic reflection are introduced,and the importance of data processing is emphasized. The influences of different parameters and methods to the processing sections are analyzed,and the main method and basic flow for the reflection data processing are determined. The velocity analysis of the CMP gathers is especially enhanced. The clear seismic profiles are acquired,and the reflection interpretation profiles that combine the formation and the velocity are presented,which provide the detailed geological data and design parameters for the engineering feasibility studies and design. The excellent exploration effects are obtained.