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《Progress in Geophysics》 2006-01
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The design of programming pre-amplifier in high-resolution seismic exploration

YUAN Zi-long,WEI Dan-ning,LI Ting-ting(Daqing Petroleum Institute,Daqing 163318,China)  
Based on parameters(V_(0)、β) of Daqing,the uniform thickness models are setup.The reflected waves from shallow to deep are calculated on the condition that the main frequency of exiting wave(Ricker wavelet) is 200 Hz.The result shows that there is large difference among the amplitudes caused by the absorption and attenuation of earth and spherical diffusion.With the increment of depth the amplitude attenuates rapidly and the main attenuation happens in 1.5 s(medium depth).To improve the amplifer a kind of intelligent programming pre-amplifier is designed whose plus can increase with the increment of depth.The plus is 0dB,18 dB,24 dB,30 dB,36 dB and 42dB responding to 0.5 s to 3.0 s.It can make up the decrease of amplitude in a way.The dynamic ranges of signals recorded by seismic instrument are over 110 dB which can meet the demand of high-resolution seismic exploration.
【Fund】: 黑龙江省自然科学基金项目(E0317);; 黑龙江省教育厅科学技术研究项目(10543003)资助
【CateGory Index】: P631.43
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