非线性扫描因子的量化分析
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摘要
传统的非线性扫描参数选取往往根据试验资料凭经验和分析加以确定,缺少科学依据。非线性扫描设计的基础是,地震波的频谱反映了大地的吸收和滤波作用,利用主要目的层段的频谱特征,求出地震波能量随频率变化的衰减曲线,进而求出大地滤波的补偿曲线。根据扫描能量与扫描时间的正比关系,定量求出非线性扫描因子,进行单位频率能量的不等分配,从而达到对高频信号进行补偿的目的。实际应用表明,合理地选择非线性扫描因子,使地震分辨率得到了明显提高,资料的品质得到了较大的改善。
In general the nonlinear scanning factor was selected only according to testing data and record appearance,which is apparently lack of scientific basis.The spectrum of seis- mic wave reflects the filter and absorption effect on the earth.By use of the spectrum of main target layer data, the energy attenuation curve and compensation curve with frequency can be determined,which is the base of nonlinear scanning design.According to the direct proportion rela- tionship between scanning energy and scanning time inter- val,the nonlinear factor can he quantitatively determined, which realizes to the different assign of per frequency ener- gy.In this way the attenuation of high frequency signals is compensated.By applying this method to real data,a good result is obtained and the testing blindness was greatly re- duced.
In general the nonlinear scanning factor was selected only according to testing data and record appearance,which is apparently lack of scientific basis.The spectrum of seis- mic wave reflects the filter and absorption effect on the earth.By use of the spectrum of main target layer data, the energy attenuation curve and compensation curve with frequency can be determined,which is the base of nonlinear scanning design.According to the direct proportion rela- tionship between scanning energy and scanning time inter- val,the nonlinear factor can he quantitatively determined, which realizes to the different assign of per frequency ener- gy.In this way the attenuation of high frequency signals is compensated.By applying this method to real data,a good result is obtained and the testing blindness was greatly re- duced.
引文
1 曹务祥，可控震源非线性参数的定量提取[J]．石油物探，2004，43(3)：242～244
2 俞寿朋．高分辨率地震勘探[M]．北京：石油工业出版社，1993．35～55
3 陆基孟．地震勘探原理[M]．北京：石油大学出版社，2004．61～83
4 Goupillaud P L.Signal design in the“vibroseis”technique[J].Geophysics,1976,41(6):1 291～1 304
5 Rietsch E.Computerized analysis of vibroseis signal similarity[J].Geophysical Prospecting,1977,25(3):541～552
2 俞寿朋．高分辨率地震勘探[M]．北京：石油工业出版社，1993．35～55
3 陆基孟．地震勘探原理[M]．北京：石油大学出版社，2004．61～83
4 Goupillaud P L.Signal design in the“vibroseis”technique[J].Geophysics,1976,41(6):1 291～1 304
5 Rietsch E.Computerized analysis of vibroseis signal similarity[J].Geophysical Prospecting,1977,25(3):541～552
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