Relative Amplitude Preservation Processing Key Technology Research Of Lithological Reservoirs In Songliao Basin

Because Lithological reservoirs will become main exploration area increasing oil reserves and stabilizing oil production in Daqing oil field,geologist and geophysicist pay more attention on lithological reservoirs. River channel sand body in Fuyu ,Yangdachengzi oil layer is the main kind of lithological reservoirs in Daqing oil field.Because the wave impedance difference is small,the wave group characteristic changes quickly in river channel sand body, we must pay more attention on relative amplitude preservation and enhancing resolution processing in order to make use of the seismic wave amplitude to analyse the change of reflection factor of river channel sand body qualitatively, This article has conducted the deep research on relative amplitude preservation processing key techniques (static correction, energy compensation and deconvolution) of lithological reservoirs in Songliao Basin.The paper has presented one method of integrated modeling static correction based on every static correction method and established the static correction method which is suitable for lithological reservoirs exploration in Songliao Basin; In the light of analysis of traditional earth absorption attenuation, one method which is time-frequency quantitative analysis,and one method of spherical divergence and absorption attenuation compensation in time-frequency space field were presented;In order to examine the effectiveness of energy compensation, one method about excited energy quantitative analysis was realized; In order to examine deconvolution's effect, one method on excited wavelet quantitative analysis was realized.These methods have been applied to the lithological reservoirs exploration in Songliao Basin. The result is very good. The paper brings out several innovative points in the following areas:(1)Integrated modeling static correction method has solved static correction problem with complex surface area and different exploration project joined processing in Songliao Basin. The application is satisfied for lithological reservoirs exploration in Songliao Basin.(2)In order to solve the problem of which the method of spherical divergence and absorption attenuation compensation only compensates energy in time field,and of which the method of surface-consistent amplitude correction only correct energy difference in space field. In the paper,a method of spherical divergence and absorption attenuation compensation in time-frequency space field was presented. The application is satisfied for seismic data processing.(3)In order to solve the problem with qualitative analysis of earth absorption attenuation in seismic data processing,a method of time-frequency quantitative analysis was presented,It could analyse earth absorption attenuation quantitatively. In order to examine the effectiveness of energy compensation processing in pre-stack relative amplitude preservation processing, an excited energy quantitative analysis method was realized; In order to examine deconvolution's effectiveness in pre-stack relative amplitude preservation processing,an excited wavelet quantitative analysis method was realized.The way of analysis of earth absorption attenuation, examining energy compensation processing and examining deconvolution processing is transformed from qualitative analysis to quantitative analysis.