基于单道边界检测和样条插值的初至波自动拾取

Automaticmethod of first break picking based on edge detection and spline interpolation.

成都理工大学信息工程学院, 四川成都610059

Chengdu Univerisity of Science and Technology, Chengdu 610059, China

初至波自动拾取方法已有很多,但在实际应用中或多或少都受到一定的限制。为此,从初至波的特点出发,提出了单道数据边界检测和样条插值相结合进行初至波自动拾取的方法。该方法的基本原理是:首先应用单道边界检测算法确定单炮记录每一地震道的能量边界;然后利用一定的判定准则对检测结果进行判别,保留正确的边界点,去掉错误的边界点;再利用正确的边界点对不确定边界点进行样条插值,得到一条连续的边界; 最后,利用能量边界点对原始记录进行映射,在一定范围内搜索最准确的初至波到达时刻。利用实际资料对方法进行了验证,结果表明,该方法拾取精度高,自动化程度高,剖面的品质得到了较大的改善。

Considering the specialty of first break, this paper discussed edge detection and spline interpolation used for first break picking.Firstly,we determined the position of energy edge in every trace by using edge detection algorithm, Secondly, we divided all the edge points into wrong points and correct points, then calculated the value of wrong points by spline interpolation.Finally, we searched the correct time in narrow range aftermapping the energy edge in original record.Thismethod has been demonstrated by real data, it has high precision and automation, the quality of processed section after applying first break auto-picking has been improved greatly.