一种基于二级索引的快速读取野外地震采集大道数单炮方法研究  

A method of fast reading massive shot data of seismic acquisition based on two-level index

作　　者：魏新建[1,2] 李书平 杨午阳 张向阳[1] 李海山[1] 许鑫[1] Wei Xin-Jian;Li Shu-Ping;Yang Wu-Yang;Zhang Xiang-Yang;Li Hai-Shan;Xu Xin(Northwest Branch of Research Institute of Petroleum Exploration&Development,PetroChina,Lanzhou 730020,China;Key Laboratory of lnternet of Things,CNPC,Lanzhou 730020,China)

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020 [2]中国石油天然气集团有限公司物联网重点实验室,甘肃兰州730020

出　　处：《Applied Geophysics》2023年第4期479-487,671,共10页应用地球物理（英文版）

基　　金：supported by Research on key techniques of geophysical exploration acquisition,processing and interpretation of CNPC Grant(No:2021DJ37.)。

摘　　要：岩高效勘探技术导致野外采集数据快速增长,如何提高大道数单炮的I/O效率直接影响现场的作业速度。考虑野外作业现场的施工环境及实际需求,通过深入研究单炮SEGY文件存储结构,本文提出了针对大数据单炮构建二级索引方法提升单炮I/O速度。该方法通过二级索引快速定位大数据单炮文件的任一单炮、任一排列及任一道的边界位置,省去顺序寻找单炮或道的时间,从而实现单炮、排列或道数据的快速读取。实际应用表明,该方法大幅提升检索单炮在文件中起始位置的效率,从而提升大道数单炮I/O速度,为全面提升现场质控效率、数据处理效率等业务奠定了基础。Effcient exploration technology leads to the rapid growth of seismic acquisition data;how to improve the big shot I/O effciency has a direct impact on feld acquisition speed.Considering the construction environment and actual requirements of the field acquisition operation site,this study proposes a two-level index method for a big shot to improve its I/O speed by thoroughly studying the storage structure of the shot fle.This method instantly locates the boundary location of any full shot,arrangement,and any trace of massive shot fles through the two-level index and eliminates the time to fnd a shot or trace in order,to realize the rapid reading of shot,arrangement,or trace data.The practical application shows that this method greatly improves the effciency of searching the starting position of a shot in the file,thereby improving the I/O speed of the big shot and laying the groundwork for comprehensively improving the feld quality control effciency and data processing effciency of feld seismic acquisition.

关 键 词：二级索引 大道数单炮 I/O效率 二分法 单炮边界 

分 类 号：P631.4[天文地球—地质矿产勘探]