| 初至时间的自动拾取 |
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| 引用本文： | 顾汉明,周鸿秋,张学强.初至时间的自动拾取[J].物探与化探,1992,16(2):130-136. |
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| 作者姓名： | 顾汉明 周鸿秋 张学强 |
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| 作者单位： | 合肥工业大学
(陈福集，刘煜洲)，中国地质科学院(姜枚) |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 初至时间的自动准确拾取一直是地震勘探中的一个基础而又很重要的问题。前人已基于一些简单的假设提出了几种自动拾取初至的计算机算法,但拾取精度总受噪音及波形变化的影响。本文提出了一种改进的倾角扫描相关算法与改进的能量比法联合拾取初至时间的方法。该方法是在利用扫描相关算法对地震道进行噪音压制后,采用能量比法确定可能存在的有效波的初至粗略时间,然后利用倾角扫描相关算法验证有效波的存在,利用峰值法及拐点校正法求取精确的初至时间,最后利用人工拾取的经验准则进行初至可靠性检查及互换时间校正。本文的算法已在Z—181微机上实现,在江苏省连云港市文物保护折射波勘查的自动化解释中应用效果较好。
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| 关 键 词： | 岩石 矿石 压电场 计算 分布规律 |
AUTOMATIC PICK OF FIRST ARRIVAL TIME |
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| Institution: | Department of Applied Geophysics, China University of Geosciences, Wuhan |
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| Abstract: | The automatic pick of the first arrivl time has been one of the basic and important problems in seismic exploration. Based on some simple assumptions, previous researchers have already put forward several computerized algorithms for automatic pick of first arrival time; neverthless, the pick precision is always affected by noise and waveform variation. This paper advances a technique for picking the first arrival time, composed jointly of an improved dip angle scanning correlation algorithm and an improved energy ratio method. After conductig noise suppression for seismic channel by means of scanning correlation algorithm, this technique employs the energy ratio method to determine rough first arrival time of the possibly existing effective wave, then uses the dip angle scanning correlation algorithm to verify the existence of effective wave, uses the peak value method and the inflection-point correction method to evaluate the precise first arrival time and, finally, uses empirical criteria for hand pick to examine the reliability of the first arrival and correct the interchange time.The algorithm put forward in this paper has been realized on Z-181 microcomputer, with fairly good results obtained in the automatized interpretation of refracted wave exploration for protection of cultural relics in Lian-yungang City, Jiangsu Province. |
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