Study On The Theory In Seismic Data Acquisition Instrument System

Seismic Data Acquisition Instrument System is the key equipment of field seismic data acquisition. The quality of field seismic data acquisition depends on the equipment. The development of seismic exploration to seismic acquisition instrument bringing forward new tentative plan and higher need, acquisition System requirements continuously in the new science and technology to improve conditions, improving and enhancing. Therefore, seismic data acquisition equipment and improving research in seismic exploration appears to be particularly important.Based on parameters 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 absorption and attenuation character of stratum are alculated as well. To improve the amplifier a kind of intelligent programming pre-amplifier, it is used to compensate the amplitude attenuation cause by the spherical posed. After the design is the mathematic model and spectrum equilibrating filter frame are designed, it is used to compensate for attenuation formation caused by the amplitude attenuation and frequency. According to formation mathematical model and attenuation of original seismic reflection amplitude of the wave to determine the differential spectrum balanced filter time constant and intelligent-controlled preamplifier gain, the smart set of programmable preamplifier, the detailed spectrum balanced filter circuit design programme, in accordance with the theoretical model established by the use of programmable devices to complete circuit design, computer simulation of the characteristics of circuit and system debugging.Intelligent programming pre-amplifier is designed whose plus can increase with the increment of depth, It can make up the decrease of amplitude in a way, which can meet the demand of high - resolution seismic exploration. Filtered by SEF strata's absorption and attenuation is compensated and the character parameters of reflected wave can be improved as well, beneficial to the heighten resolution of seismic exploration.