排列长度对组合效应的影响分析
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摘要
在长期的检波器组合研究当中,人们一直认为随着炮检距的增加,点距时差(—Δt)加大,大炮检距的检波器组合对有效波造成压制。为了保证组合效果,必须减少组合尺度,特别是高分辨率勘探。但是,由于大地的吸收作用,地震子波的长度随传播距离的增加也在增加,这种增加制约了点距时差与信号主周期(T)的比值(Δt/T)的变化,使得炮检距的增加对组合效应的影响减小。为了定量研究排列长度对组合效应的影响,利用反射波时距关系计算点距时差,根据地震波的时间衰减规律计算子波长度的变化,找出Δt/T的变化规律,从而得出排列长度对组合效应影响不大的结论。
During the long-term geophone array research,people have al- ways held that the time difference of geophone interval(?)increases with the increase of offset and that the geophone array with big off- set may suppress the effective wave.In order to ensure the array effect,the array length should be decreased,especially for high resolution prospecting.But seismic wavelet length increases with the increase of transmitting distance,which restricts the change in ratio of time difference(to signal dominant circle(;therefore,the increase of offset has less effect on array response.To quantitative- ly study the effect of arrangement length on array response,the time-depth curve of reflection is used to calculate time difference and the change of wavelet length computed based on the time atten- uation law to find the changing rule of.The result shows that the arrangement length has only a little effect on array response.
During the long-term geophone array research,people have al- ways held that the time difference of geophone interval(?)increases with the increase of offset and that the geophone array with big off- set may suppress the effective wave.In order to ensure the array effect,the array length should be decreased,especially for high resolution prospecting.But seismic wavelet length increases with the increase of transmitting distance,which restricts the change in ratio of time difference(to signal dominant circle(;therefore,the increase of offset has less effect on array response.To quantitative- ly study the effect of arrangement length on array response,the time-depth curve of reflection is used to calculate time difference and the change of wavelet length computed based on the time atten- uation law to find the changing rule of.The result shows that the arrangement length has only a little effect on array response.
引文
1陆基孟．地震勘探原理[M]．北京：石油工业出版社，1993．130～160
2何樵登．地震勘探原理和方法[M]．北京：地质出版社，1986．159～200
3李庆忠．走向精确勘探的道路[M]．北京：石油工业出版社．1993．45～59
4曹务祥．单道接收地震资料的室内组合方法[J]．石油地球物理勘探，2006，41(6)：615～618
2何樵登．地震勘探原理和方法[M]．北京：地质出版社，1986．159～200
3李庆忠．走向精确勘探的道路[M]．北京：石油工业出版社．1993．45～59
4曹务祥．单道接收地震资料的室内组合方法[J]．石油地球物理勘探，2006，41(6)：615～618
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