The Optimal Design Of Illumination Analysis And Observation System Based On Wave Equation

With the deepening of the degree of oil and gas exploration,the exploration focus gradually shift to the central and western regions of our country.Due to the earthquake surface condition and underground structure forms in the study area are complex,all these factors restrict the accuracy of seismic imaging.Based on ray theory of surface consistent,not suitable for this kind of "dual complex structure areas." And based on wave equation seismic illumination analysis,can very good improvement in the process of complex seismic acquisition in the study area observation system design scheme,it is important for improving image quality of seismic section.In this dissertation,the analysis of seismic illumination and wave field snapshots during seismic wave propagation is carried out on a series of theoretical velocity model.Then the feasibility of the optimization design of seismic observation system based on wave equation illumination analysis is proved.Subsequently,a reasonable velocity model is established according to previous geological data and geophysical parameters,and the illumination simulation is carried out for different structural positions in the model.In view of the energy shielding area and the weak energy region generated by underground,the observation system is changed by means of shooting points and changing geometry.According to the before and after comparison for illumination simulation effect diagram,the parameters needed for the observation system of the study area,such as track distance,shot distance and offset,are optimized.Finally,combine with the contrast between improved pre and post seismic overlay profiles and contrast of acquisition section effect in actual study area,an observation system optimized for illumination analysis based on wave equation is derived.The accuracy of seismic imaging has indeed been greatly improved.