[1]彭涛,吴雪刚,魏燕,等.地震勘探中的几种常见“多初至”现象解析[J].复杂油气藏,2009,(01):32-34.
　Peng Tao,Wu Xuegang,Wei Yan,et al.Remaining oil distribution patterns of littoral facies sandstone reservoir with bottom water during mid-later stage[J].Complex Hydrocarbon Reservoirs,2009,(01):32-34.
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地震勘探中的几种常见“多初至”现象解析

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《复杂油气藏》[ISSN:1674-4667/CN:31-2019/TQ]

Title:: Remaining oil distribution patterns of littoral facies sandstone reservoir with bottom water during mid-later stage

Author(s):: Peng Tao; Wu Xuegang; Wei Yan; Xu Mei; Geophysical Prospecting Company of JOECO,SINOPEC,Yangzhou,Jiangsu 225009

Keywords:: seismic exploration; seismic wave; multiple first breaks; repetitive shock; bubble effect; vibrator

摘要:: "多初至"现象在不同的地震施工条件下具有不同的形成机制,解决方法也各不相同。在沼泽区激发时,淤泥层的上下震荡在单炮记录上形成若干组多次初至波。淤泥层较薄时采用单深井在淤泥层以下激发,淤泥层较厚时采用试验所得参数进行组合激发,能有效消除"多初至"现象;在水中激发时,为消除气泡效应导致的"多初至"现象,可选择激发深度小于初始气泡的半径;对于可控震源作业中因震源耦合影响造成的"多初至",应考虑降低驱动幅度或加载力控装置,也可适当加大扫描长度;此外,重视设备维护保养,可避免因设备原因导致的"多初至"现象。

Abstract:: In different exploration conditions,the cause of multiple first break phenomenon is different,so are the resolutions.When shooting in swamp areas,the silt seam will shake up and down,which generates several mutiple first breaks.In order to eliminate this phenomenon,if the silt seam is thin,shot must be conducted below the silt seam in single hole,and if not,shooting in array holes with parameters acquired in test. When shooting in water,to eliminate multiple first breaks caused by bubble effect ,the shooting depth must be less than the radius of initial air bubble.If source is vibrator and multiple first breaks are caused by coupling problem, it is effective to reduce force peak or furnish control device,or enlarge sweep length. The problem of multiple first breaks can be also avoided by keeping the equipments in good conditions.

1　贾烈明，梁运基，李劲.炸药震源水中击发二次冲击的形成机制与消除方法.石油天然气学报，2006，28（3）：61～63
2　陆基孟主编.地震勘探原理.山东:石油大学出版社，1996
3　王丙坤.玉门地区可控震源“双初至”“多初至”问题浅析.石油地球物理勘探，1994，(S1)：149～152

[1]苏心华.高大沙丘区地震采集方法研究与运用[J].复杂油气藏,2010,(02):42.
[2]晁如佑,付英露,石一青,等.复杂障碍区三维地震观测系统变观设计方法及应用[J].复杂油气藏,2010,(04):31.
[3]朱健,王瑞雪.滩浅海地震勘探几种常见问题探讨[J].复杂油气藏,2012,(02):32.
[4]雷扬,吴闻静,刘远志,等.羌塘盆地地震资料采集检波器组合方法研究[J].复杂油气藏,2012,(02):36.
[5]王东江,马朝旭,许亚全.单纯GPS与海上综合导航系统对比分析[J].复杂油气藏,2012,(04):35.

备注/Memo:: 收稿日期：2008-09-07；改回日期：2008-12-04
作者简介：彭涛（1981—），工程师，2003年毕业于江汉石油学院勘查技术与工程专业，现从事野外地震勘探技术工作。电话：13776435220，E-mail：pengtao30@tom.com。

更新日期/Last Update: 2013-06-21