摘要
本文提出的初至时间自动模糊检测方法,引入了模糊教学的基本原理,综合利用现有自动检测初至时间诸方法的优点和和手工检测的经验及特点,以提高自动检测初至时间的精确性和可靠性,增强适应性。文中对用迭代射线追踪方法,引入变主频、变峰值的子波合成的VSP记录进行检测的实例表明:对于不同信噪比(包括含71.4%噪声的情况)、不同波形、峰值逐道变化、虚反射以及初至同相轴下连续等不同干扰的记录,自动模糊检测法所得结果在绝对系统误差、标准差、最大误差和均方根误差等方面(?)明显小于其它方法相应的误差。自动模糊检测法还能检测混合相位子波、零相位子波和第一周期能量较小子波的初至时间。
It has been a basic and serious problem to pick the first-break times accurately. In this paper, a method of Automatic Fuzzy Picking (AFP) for the first-break times is proposed. The method involves introducing the fundamental principles of the fuzzy mathematics and utilizing the advantages of current automatic first-break-time picking methods, and the experience and distingushing characteristics of hand picking first-break times for increasing the accuracy, credibility, and the adaptability of the current automatic picking first-break times. Next, by means of an iterative ray-tracing method, the VSP records are synthesized with the wavelets of different dominant frequency and peak value. The examples in synthetic records demonstrate that the absolute systematic errors, standard deviations, maximum errors and root-mean-square errors made by using the AFP method, are all evidently smaller than those by using other methods, in disturbing records of different S/N (including the case of containing the noise 71.4%), the waveforms, peak values various from trace to trace, the ghost, the discontinuous event of the first arrivals, etc. The AFP method can also pick the first-break times of mixing phase wavelets, zero phase wavelets as well as the weak-energy wavelets in the first period.
出处
《江汉石油学院学报》
CSCD
北大核心
1990年第1期25-32,共8页
Journal of Jianghan Petroleum Institute
关键词
地震勘探
初至时间
模糊数学
检测
seismic exploration: seismic record
first-break
arrival time
picking
fuzzy mathematics
VSP
