Abstract
In the processing of converted wave data, points of difficulty exist in the gathering of common conversion points and dip‐moveout correction (DMO), whereas the Kirchhoff Prestack Time Migration Technology can be used to realize the full space imaging of three‐dimensional converted wave data without requiring such processing means as gathering of common conversion points, dip‐moveout correction (DMO) and post‐stack migration. For this reason, applications of prestack Kirchhoff time migration in the processing of converted wave data are discussed herein. What discussed here involves the methods and principles of establishment of initial velocity field for prestack time migration—which are, the introduction of anisotropic parameters in the scatter travel time equation based on the characteristics of converted‐wave, and the use of Three Spectrum analysis method to build the initial velocity field for pre‐stack time migration. Also discussed are the methods and principles of buildup of prestack time migration velocity field— namely, the optimal migration velocity field shall be determined through the migration of common imaging point gathers, inverse normal moveout correction, mutual iterative interpretation of velocity and anisotropic parameters. The processing method has been applied to process the 3‐Dimenion and three‐component converted‐wave data m XC gas field. After processing, the sections of pre‐stack time migration can have clear images, exact location, and fine geologic configuration.
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