Research And Application Of Deep Seismic Energy Compensation Method In Taixinan Basin

With the development of seismic exploration area,the demand of high quality of deep seismic data is essential.In this paper,improvement of the deep seismic wave energy in the southwest basin,and the study on the absorption mechanism of the seismic wave,the technique of deep denoising and the method of energy compensation is proposed,in order to improve the resolution and the signal to noise ratio of the seismic data.The study of the attenuation of seismic waves can be summarized as follows: firstly,it is related to the geological subsurface structure,aiming at the energy divergence and collection caused by the fluctuation of the reflection interface and the reflection coefficient,also fouscing on the absorption and multiple reflection in the stratum,and the scattered radiation caused by the heterogeneous medium in the formation;Then we make a research on the intensity of the seismometer,the sensitivity of the geophone,and the coupling between them.the strong absorption of some strata in the vicinity of the surface is anlasied.The propagation characteristics is introduced as the absorption and change caused by the divergence of the seismic wave propagating waves and the diversity of the propagation path.Focusing on the marine area of the southwest Taiwan Basin,seismic data is processed,that improve the seismic data quality and provide a reliable data for subsequent Q extraction of energy compensation.Conisidering that undisturbed noises in the seismic data of basin,which mainly include multiple waves,resonant earthquakes,waterfowl,sea waves,abnormal amplitude and so on,seismic data is denoised as the characteristics of marine data that removing the noise caused bywaterbirds with the method of F-K filtering and Radon transform;Also,the wave interference and abnormal amplitude are processing under frequency division median filter.As multiple waves are the most serious interference in the ocean area,it has a serious impact both on shallow Layer imaging and deep layers.Multiple waves are combined to suppress multiple waves.Firstly,the SRME method is used for multiple waves related to the free surface.Then,the multiple waves in the shallow layer are used to predict the deconvolution using the Tau-p domain.Also,the high precision Radon transform technique is used to suppress the long period multiple waves.In this paper,the spherical diffusion compensation method is applied to the divergence of energy caused by the propagation of seismic waves,and the inverse Q filtering is used for the energy loss caused by stratum absorption in Southwest Taiwan area that the deep energy has been improved obviously.The compensated seismic data indicates the improvment of the resolution and signal to noise ratio and and a clear image of the Moho surface with the widen frequency band and the raised main frequency.