延迟爆炸法的理论分析
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摘要
胡立新 ,杨德宽 ,何兵寿 ,魏修成 .延迟爆炸法的理论分析 .石油地球物理勘探 ,2 0 0 2 ,37(1) :33～ 38通过分析野外试验数据 ,研究了延迟爆炸情况下地震波的传播特点。采用正演模拟和其他数学手段 ,探讨了延迟爆炸时地震波主频、频宽、能量的变化规律 ,分析了入射角对上述因素的影响特征。研究结果表明 :相同药量条件下 ,采用延迟爆炸激发方式可增大地震波主频、拓宽地震波频宽、增大下行地震波能量 ;在常规地震勘探入射角范围内进行延迟爆炸激发时 ,由入射角所引起的地震波波形及其频谱畸变十分微小。从野外叠加剖面可看出 ,延迟爆炸法能够在一定程度上提高勘探分辨率
Through analyzing field test data, the paper studied spreading character of seismic wave in a condition of delayed blast. Adopting forward modeling and other mathematical tools, the changing rule of dominant frequency, band width and energy of seismic wave was discussed and the influence of incident angle on above-mentioned factors was analyzed in a condition of delayed blast. The research results showed that in a condition of same charge size, using explosive mode of delayed blast can enlarge dominant frequency of seismic wave, widen its band and strengthen energy of down-going seismic wave; the distortion of seismic waveform and its spectrum caused by different incident angle is very small when delayed blast is carried out within an incident scope of conventional seismic exploration. The field stack sections show that the method can improve exploration resolution in some degree.
Through analyzing field test data, the paper studied spreading character of seismic wave in a condition of delayed blast. Adopting forward modeling and other mathematical tools, the changing rule of dominant frequency, band width and energy of seismic wave was discussed and the influence of incident angle on above-mentioned factors was analyzed in a condition of delayed blast. The research results showed that in a condition of same charge size, using explosive mode of delayed blast can enlarge dominant frequency of seismic wave, widen its band and strengthen energy of down-going seismic wave; the distortion of seismic waveform and its spectrum caused by different incident angle is very small when delayed blast is carried out within an incident scope of conventional seismic exploration. The field stack sections show that the method can improve exploration resolution in some degree.
引文
[1] 王卫华.纵波勘探中的炸药激发方式分析.石油地球物理勘探,1999,34(3):249～259
[2] 范祯祥,郑仙种等.地震波数值模拟与偏移成像,河南科学技术出版社,1994
[3] 杜世通.地震波动力学,石油大学出版社,1996
[4] 刘洋,李承楚等.任意偶数阶精度有限差分法数值模拟.石油地球物理勘探,1998,33(1):1～10
[5] 罗大清,宋炜等.加权方向校正及插值预测吸收边界条件的三维波动方程叠前数值模拟.石油地球物理勘探,1999,34(3):275～284
[6] 俞寿朋.高分辨率地震勘探,石油工业出版社,1993
[7] 蒋连斌,唐建人等.高分辨率三维开发地震采集技术在太190区块的应用.石油地球物理勘探,2000,35(4):433～442
[2] 范祯祥,郑仙种等.地震波数值模拟与偏移成像,河南科学技术出版社,1994
[3] 杜世通.地震波动力学,石油大学出版社,1996
[4] 刘洋,李承楚等.任意偶数阶精度有限差分法数值模拟.石油地球物理勘探,1998,33(1):1～10
[5] 罗大清,宋炜等.加权方向校正及插值预测吸收边界条件的三维波动方程叠前数值模拟.石油地球物理勘探,1999,34(3):275～284
[6] 俞寿朋.高分辨率地震勘探,石油工业出版社,1993
[7] 蒋连斌,唐建人等.高分辨率三维开发地震采集技术在太190区块的应用.石油地球物理勘探,2000,35(4):433～442
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