Seismic Scattered Wave Field Forward Modeling For The Inhomogeneous Media

With the development of seismic exploration, the simple structured reservoir which is easy to exploit can no longer satisfy the growing requirement for oil and gas resources. Now exploration and development have focused on complex non-homogeneous reservoir. Conventional seismic methods based on reflected wave simulation show limitations on this situation. So the seismic scattered wave numerical modeling of heterogeneous structures developed. In this paper, the study of seismic scattered wave forward modeling for the inhomogeneous media is being researched. The content is divided into following respects:1. Simulate the seismic scattered field by using integration method based on Green's function. The forescattered and backscattered filed were separately calculated by downgoing and upgoing Green's function. In order to get the seismic scattered field of the multi-scale heterogeneous structures such as fractures system, multi-scale mesh generation and variable grid integration method are introduced. Then verify the correctness and feasibility of this method through numerical models, and recognize the scattered wave characteristics.2. Using the Green's function integration numerical method to simulate the scattered wave of heterogeneous structures such as rolling layer and pored media. Analyze the scattered wave field characteristics of rolling layer with different scale and pored media with different physical parameters. Investigate the relationship between scatterer's dimensions and scattered wave characteristics.3. Study on pre-stack depth migration by one-way seismic scattering integral method preliminary. Then analyze the migration sections through numerical models of heterogeneous structures to verify the correctness of the algorithm.4. After numerical simulation to the scattered wave field of actual model contains pored media, recognize and analysis the characteristic of heterogeneous media, validate the applicability and portability of the Green's function integration numerical method.