可控震源线性扫描的优化设计
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摘要
在可控震源技术发展的过程中 ,许多学者对扫描技术进行了研究 ,提出了几种新的扫描技术 ,但由于这些新技术自身的局限性 ,在实际的野外工作中 ,线性扫描的应用仍然最为广泛。因此 ,在便携式高频可控震源系统(PHVS)的研究中 ,首先研究了线性扫描技术 ,如何通过优化设计来提高线性扫描的分辨率是该项研究的主要目的。在可控震源法地震勘探中 ,勘探分辨率取决于相关子波的分辨率 ,而相关子波又来源于扫描信号的自相关函数。为此我们研究了线性扫描的各个变量与其自相关函数间的关系、幅度锥化对其自相关函数的影响 ,提出了线性扫描的优化设计方案 ,通过相应的合成地震剖面 ,予以验证。
During the period of the development of vibroseis technique,many researches focusing on sweep techniques were implemented by some scientists. Although these new sweep techniques were developed,due to their own limitations,linear sweep remains the dominant place in field practice. Therefore,the linear sweep technique is first studied in our study of Portable High frequency Vibrator System(PHVS). The objective of our study is to acquire better resolution by using optimal design of linear sweep. The survey resolution in viboseis method of seismic exploration is determined by the resolution of correlation wavelet which is proportional to the auot correlation function of the sweep signal,so the relationships between auto correlation function and parameters of linear sweep,the effect of amplitude tapering on auto correlation function,are studied respectively. By using synthetic seismogram, the schemes of optimal design of linear sweep can be verified.
During the period of the development of vibroseis technique,many researches focusing on sweep techniques were implemented by some scientists. Although these new sweep techniques were developed,due to their own limitations,linear sweep remains the dominant place in field practice. Therefore,the linear sweep technique is first studied in our study of Portable High frequency Vibrator System(PHVS). The objective of our study is to acquire better resolution by using optimal design of linear sweep. The survey resolution in viboseis method of seismic exploration is determined by the resolution of correlation wavelet which is proportional to the auot correlation function of the sweep signal,so the relationships between auto correlation function and parameters of linear sweep,the effect of amplitude tapering on auto correlation function,are studied respectively. By using synthetic seismogram, the schemes of optimal design of linear sweep can be verified.
引文
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6 俞寿朋 :高分辨率地震勘探 ,北京 ,石油工业出版社 ,1994。
7 李庆忠 :走向精确的勘探道路 -高分辨率地震勘探系统工程剖析 ,北京 ,石油工业出版社 ,1994。
8 王庆海徐名才 :抗干扰高分辨率浅层地震勘探 ,北京 ,地质出版社 ,1990。
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2 H .WERNER&TH .KREY ,COMBISWEEP -ACONTRIBUTIONTOSWEEPTECHNIQUES ,GEOPHYSICALPROSPECTING .VOL .2 7.
3 A .B .CUNNINGHAM ,SOMEALTERNATEVIBRATORSIG NAL ,GEOPHYSICS ,1979,VOL .47,No .6 .
4 张子三林君付晓江孙彩堂 :浅析可控震源的扫描技术 ,石油仪器 ,1997,11(6 )。
5 PIERREL .GOUPILLAUD 1976 ,SIGNALDESIGNINTHE“VI BROSEIS”SYSTEM ,GEOPHYSICS ,VOL41,No.6
6 俞寿朋 :高分辨率地震勘探 ,北京 ,石油工业出版社 ,1994。
7 李庆忠 :走向精确的勘探道路 -高分辨率地震勘探系统工程剖析 ,北京 ,石油工业出版社 ,1994。
8 王庆海徐名才 :抗干扰高分辨率浅层地震勘探 ,北京 ,地质出版社 ,1990。
9 B .M .GURBUZ ,SIGNALENHANCEMENTOFVIBRATORYSOURCEDATAINTHEPRESENCEOFATTENUATION ,GEO PHYSICALPROSPECTING 1972VOL 2 0 .
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