A Study On The Rule Of Absorption And Attenuation About Seismic Signal By Near-surface In Daqing Exploration Area

Studying the dynamics and media effect of the seismic wave in spreading through the medium, the mechanism of waves absorbing and attenuation in the near-surface of the exploratory areas of Daqing was analysed . Some effecting factors were discussed., which included the collect direction of waves, exploding, receiving and observation system, etc., Because of the quality of. waves'absorption and attenuation by the earth filtering ,we developed a equipment that received waves in the well when we were stimulating on the surface. We have worked out the problems that the time of first break was inconsistency and the capacities near the shot point was distortions and far small. The parameters such as seismic layering and the speed,thickness etc, was calculated using the software of WISS. The rules of absorbing attenuation was studied using the mechanism of frequency shift method.Through the calculation of data of micro logging and VSP, the rule of absorbing attenuation of the vertical in some wells in Halar, the north basin of Songliao Basin and the Pu333 area was made out. The horizontal attenuating rule of main frequency amplitude was also summed up. The plane chart that the horizontal absorbing attenuation regulation of the main frequency amplitude is also derived.Design the depth of wells, the stronger geologic strata were averted from, so good results were obtained in actual application.