海底地震勘探检波点定位关键算法及软件研制

Key algorithms for ocean bottom seismometer positioning andsoftware development

检波点二次定位是海底地震勘探的关键步骤之一,其定位精度直接关系到地震数据的成像质量。针对海底地震勘探作业需求,对声学定位、超短基线(USBL)定位以及初至波定位关键算法进行了详细设计,基于算法研制了海底地震勘探检波点定位软件,包括整体架构设计、功能模块划分及具体开发实现,并利用实测数据对软件定位精度进行了验证与分析。实验结果表明,软件声学、USBL以及初至波在N、E方向上的定位结果与国外主流商业软件Gator结果相差均在1 m左右,能够满足海底地震勘探数据成像需求。同时,将3种定位算法对同一测线的定位结果进行了对比,三者的结果具有良好的一致性,进一步验证了该软件的可靠性。

Secondary positioning of ocean bottom seismometers is one of the key steps in submarine seismic exploration,and positioning accuracy has a direct impact on seismic imaging.Focusing on the requirements of submarine seismic exploration,the key algorithms for acoustic positioning,ultra-short baseline(USBL)positioning and first-break positioning were designed in detail,followed by the development of the software system,including overall architecture,functional modules,and programming.The positioning accuracy of the software was verified and analyzed based on field data.Experimental results show 1m differences in the N and E directions in acoustics,USBL and first-break positioning results between the self-developed software and Gator,which is a dominant business software system.This means that the accuracy of positioning is sufficient for submarine seismic imaging.In addition,three types of positioning results show good consistency,further verifying the reliability of the software.