OBC勘探中扫描拟合二次定位方法

在滩、浅海勘探中,检波器位置会发生漂移,因此室内资料处理时必须对检波器位置进行二次定位。目前,检波点的二次定位精度已成为评价OBC勘探数据采集质量的重要指标。本文首先分析了当前OBC勘探中声波二次定位方法及初至波二次定位方法的优缺点;并在这些传统检波器二次定位方法的基础上,提出了一种新的初至波二次定位方法——扫描拟合法,该方法通过网格扫描、曲面拟合、求曲面极值来确定检波点的二次定位坐标。实际应用效果表明,本算法具有运算速度快、定位精度高等优点。

A secondary positioning method by grid scanning and curved-surface fitting in OBC survey

OBC sensors are often drifted in TZ or offshore seismic exploration.Therefore getting the real positions of the sensors is needed during data processing.Nowadays the sensors secondary positioning has become more and more important for OBC data acquisition quality.We analyze in this paper the advantage and disadvantage of the acoustic secondary positioning method and the first breaking secondary positioning method.Based on these traditional secondary positioning methods,we present a new first breaking secondary positioning method named scanning-fitting method.This method determines secondary positioning coordinates of sensors by scanning grids,fitting curved surface and solving the extreme value of the curved surface.The application to real data shows that this new method has the advantages of high efficiency and high accuracy.