可控震源信号中的谐波畸变影响及消除
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摘要
可控震源信号中存在谐波畸变是不可避免的,而谐波产生的原因多种多样。若想最大程度地减小可控震源信号谐波,就必须清楚谐波产生的原因,进而有针对性地采取措施以减小震源谐波。由于可控震源相关地震记录的产生存在着的一些特殊问题,本文提出有必要对可能导致”源致干扰”产生的参考信号中的谐波畸变分量大小进行监控。 震源信号中谐波畸变对相关地震资料面貌的不良影响与所采用的扫描信号类型和扫描参数有关。因此,在地震勘探工作的实践中,应视具体施工环境和针对具体勘探任务目的,合理地选用扫描信号参数。使谐波对地震资料的影响程度降到最低。本文提出了除在可控震源施工时减小或消除谐波影响所应采用的几种方法之外,还分析了其它可能导致可控震源信号谐波产生的因素,并从可控震源设计制造角度提出了减小可控震源信号谐波产生的几项措施。
It's unavoidable that there is distorted harmonics in vibroseis signal and there are many reasons that can result in harmonics. If you want to maximally reduce the harmonics in vibroseis signal, it must realize the reasons that cause the harmonics and adopt relevant measures to reduce the harmonics of source. Because producing correlation seismic record of vibroseis has some special problems, the paper presented that it's necessary to control the amplitude of distorted component in harmonics of reference signal produced by "source-resulted interference".
The bad influence of distorted harmonics in source signal on seismic data is related to adopted scanning signal type and scanning parameters. Therefore, in practice of seismic exploration, seasonable selection of scanning parameters according to concrete operation environment and exploration target, making the influence of harmonics on seismic data minimum. The paper presented some methods to reduce or remove the influence of harmonics in vibroseis operation, analyzed their factors that may result in producing harmonics of vibroseis signal and presented some measures from point of view of vibroseis design and fabrication that can reduce the production of harmonics in vibroseis signal.
It's unavoidable that there is distorted harmonics in vibroseis signal and there are many reasons that can result in harmonics. If you want to maximally reduce the harmonics in vibroseis signal, it must realize the reasons that cause the harmonics and adopt relevant measures to reduce the harmonics of source. Because producing correlation seismic record of vibroseis has some special problems, the paper presented that it's necessary to control the amplitude of distorted component in harmonics of reference signal produced by "source-resulted interference".
The bad influence of distorted harmonics in source signal on seismic data is related to adopted scanning signal type and scanning parameters. Therefore, in practice of seismic exploration, seasonable selection of scanning parameters according to concrete operation environment and exploration target, making the influence of harmonics on seismic data minimum. The paper presented some methods to reduce or remove the influence of harmonics in vibroseis operation, analyzed their factors that may result in producing harmonics of vibroseis signal and presented some measures from point of view of vibroseis design and fabrication that can reduce the production of harmonics in vibroseis signal.
引文
1 连绥仁.可控震源与地震资料品质的改善.石油地球物理勘探.1988年,第24卷,第3期
2 David Walker,大地-可控震源系统中的谐波共振结构和不规则动态特性.Geophysical Prospecting.1995年,第43卷,第4期
3 C.B.实现可控震源高分辨率地震勘探的方法和设备.国外油气勘探.1997年,第9卷,第2期
2 David Walker,大地-可控震源系统中的谐波共振结构和不规则动态特性.Geophysical Prospecting.1995年,第43卷,第4期
3 C.B.实现可控震源高分辨率地震勘探的方法和设备.国外油气勘探.1997年,第9卷,第2期
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