浅水域检波点自动重定位技术  

Automatic repositioning technique for shallow water receiver points

作　　者：徐维秀[1] 

机构地区：[1]中国石化胜利石油管理局地球物理勘探开发公司,山东东营257000

出　　处：《石油地球物理勘探》2011年第1期6-11,164+167,共6页Oil Geophysical Prospecting

基　　金：国家"863"项目"浅海水下高精度检波器定位系统的研制(2006AA09Z309)"资助

摘　　要：在传统检波器二次定位方法的基础上,本文提出了浅水域检波点自动重定位技术。从几何声学角度,建立检波点定位的三维数学模型,既考虑了直达波,又兼顾了折射波;文中对模型中的几个主要参数进行了详细分析,评估了各参数对最终计算结果的影响;探讨了适合浅水域地震数据的初至自动拾取方法,改进了能量比法,并设计了详细的自动重定位算法流程;针对地震采集对定位的高精度和实时性需求,提出了相应的关键技术解决方案和措施。实际资料测试结果表明:该算法定位精度高、过程自动化,主要性能指标均高于常规定位技术。Based on the secondary positioning method for the traditional geophone,the automatic repositioning technique for shallow water receiver points was proposed in this paper.From the view of geometric acoustics,3D math model for geophone positioning was established,which not only considered the direct wave,but took into account the refraction as well.Several main parameters in the model were analyzed in this paper and the impact of each parameter to the final result was estimated.The automatic first break picking up method which fits the seismic data in the shallow water area was discussed and energy ratio method was improved and then detailed automatic repositioning algorithm flowchart was designed.Regarding the real time requirement for the high accuracy and positioning which the seismic acquisition faces,the corresponding key technical solution plan and measures were finally proposed.The testing results for the field data show that the positioning accuracy of the technique is high and the application process of the technique is automatic.Its main performance specifications are superior than other routine techniques.

关 键 词：检波点重定位 地震数据采集 差分全球定位系统 定位精度 浅水域 初至自动拾取 

分 类 号：P631[天文地球—地质矿产勘探]