A Study On Forward Modeling Of Three-dimensional Gauss Beam Under The Undulating Surface

With the gradual deepening of oil and gas exploration and development in China,Conventional seismic exploration techniques are no longer suitable for oil and gas exploration in complex areas with undulating surface(such as mountain lands,deserts,Gobi,plateaus,hills,etc.).In order to better solve the problems of exploration and development in these complex areas,it is very important to study the method of seismic forward modeling under the undulating surface.In order to study the problem of seismic wave propagation under undulating surface,and the computational efficiency and accuracy of seismic wave field are also satisfied,based on the principles and advantages of Gauss beam method in this paper,the three-dimensional Gauss beam forward program under undulating surface is written by C++ language in Microsoft Visual Studio 6.0 environment,and combined with Qt development tools to design user interface,thus the three-dimensional Gauss beam forward modeling method for complex areas with undulating surface models is developed.Calculated through a variety of threedimensional theoretical models under undulating surface,the ray paths obtained are accorded with the kinematics laws of surface seismic,and the synthetic seismic records can also accurately reflect the underground geological structures.In addition,the results of the algorithm validation and actual data application also indicate that this method can realize the forward modeling of the seismic wave field in complex areas with three-dimensional undulating surface,so as to prove the correctness,feasibility and adaptability of this method.It has certain guiding significance for the forward modeling of undulating surface in complex areas,and lays a foundation for further seismic inversion.