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《Geophysical Prospecting For Petrole》 2004-05
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Absorption and attenuation of stratum and recording performance of seismic instrument.

Yuan Zilong and Li Tingting.Yuan Zilong,Daqing Petroleum Institute, Daqing 163318, China  
To distinguish strata with thickness of about 1 m under depth of 1 500 m,a seismic instrument must have the ability to record signals whose frequencies are more than 1 000 Hz. And its instantaneous dynamic range should reach up to about 120 dB. Either the early centralized digital seismograph or the modern 24-bit telemetric seismograph cannot meet this demand. Based on even medium and using Ricker wavelet with dominant frequency of 150 Hz, this paper calculated theoretically the attenuated energy and absorbed frequency during propagation of seismic waves. The instantaneous dynamic range and the highest frequency that can be recorded were then analyzed. It is shown that for seismic reflections with traveltime exceeding 1.5 s, their instantaneous dynamic ranges will be about 60 dB, and the highest frequency of signals cannot exceed 170 Hz.
【Fund】: 黑龙江省自然科学基金项目(E0317)资助。
【CateGory Index】: P631.43
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