Improved angle transformation zero offset imaging method

Based on the ellipse expansion principle, the angle transformation zero offset imaging algorithm is derived by introducing two parameters of seismic wave incident angle and stratigraphic dip angle in this paper. This method can realize zero offset imaging with only these two angles. However, strong interference noise exists during imaging. Aiming at this problem and the production application, three improved methods, using seismic wave incident angle only, stratigraphic dip angle only, velocity and stratigraphic dip angle together have been derived. By comparing these three methods, we optimized and realized the successful application of improved angle transformation zero offset imaging algorithm with velocity and stratigraphic dip angle. Through the mathematical analysis, numerical model and the real data processing, the effectiveness of the new method is verified. The new method does not need the assumed condition that the subsurface reflection layer has to be horizontal. In addition, the subsurface reflection layers can be dip or bending. In the condition of homogeneous medium, the real subsurface velocity and stratigraphic dip angle can be estimated, and the real zero offset imaging can be realized with the new algorithm, which is essentially different from CMP methods. For the complex subsurface medium, the new method can also perform a better zero offset imaging.