Frequency Grouping Coding Scheme for Blended Source Imaging

Summary The efficiency of common shot migration can be greatly enhanced by coding migration scheme. However, coding migration scheme introduces the crosstalk noise which can degrade the quality of migration images. In this paper, we present a matrix representation for both frequency dependent coding migration and frequency independent coding migration. A new coding scheme called frequency grouping coding scheme is presented by analyzing the matrix representation. This coding migration scheme makes use of the wavefield similarity of the adjacent frequency to suppress the crosstalk introduced by coding migration scheme. Conventionally, the crosstalk suppression is conducted on a single coding correlation matrix or a single frequency coding correlation matrix. However, this method uses the summation of multi coding correlation matrixes to suppress the corsstalk. This coding scheme could either be used as a single-experiment strategy or a multi-experiments strategy. Numerical tests prove the feasibility of this coding scheme.