Study On The Carboniferous Seismic Response Characteristics And Weak Reflection Processing

With the deepening of exploration in the west,the carboniferous has gradually become an important area of exploration.Based on the characteristics of the Carboniferous seismic data,the seismic response characteristics and imaging processing techniques of the Carboniferous igneous rocks are studied in the Chepaizi area in the western margin of the Dzungaria Basin.The geological model is constructed by combining logging,drilling data and typical imaging profiles in the western margin of the Dzungaria Basin.The wave equation method is used to carry out the forward modeling.Through the analysis of the drilling data of wells Pai60,Pai61,and Pai66,the geophysical parameters corresponding to different Carboniferous reservoirs are obtained for forward modeling.The seismic response and variation law of different types of Carboniferous seismic waves are studied by forward modeling.According to the characteristics of carboniferous data,the compensation coefficients are calculated and applied in different frequency bands by time-frequency amplitude compensation,so that the amplitude of the weak reflection signal of the carbonaceous interior is effectively recovered.Develop targeted weak signal enhancement technology to improve the quality of Carboniferous imaging.Study the effect of different multiple attenuation methods on simple and interbed multiples.The preferred method and parameters eliminate the multiple wave interference of the Carboniferous system.Through the application of actual data,a series of processing technologies series for the carboniferous seismic data in Chepaizi area of the western margin of Dzungaria basin has been formed,which has improved the quality of the data and the image quality,and provided high quality seismic data for the carboniferous exploration in this area.On the basis of summarizing the previous research results,the thesis mainly studies and applies on weak reflection signal strengthen technology of the Carboniferous seismic data in this area.Through typical model building,forward modeling,seismic response research and actual data application,the reasons for the poor imaging of Carboniferous data are analyzed.On this basis,the corresponding technology for solving the Carboniferous seismic data imaging problems is proposed.The actual data in the target block has been processed,and achieved good results.The effective targeted processing technology is summarized,the imaging of Carboniferous seismic data is further improved,and good exploration results are obtained.At the same time,it can provide technical reference for future Carboniferous exploration.