STATISTICAL DECODING AND IMAGING OF MULTISHOT AND SINGLE-SHOT SEISMIC DATA

摘要

We here disclose new statistical based methods for decoding and imaging of multisweep multishot data. Standard single shot data are treated as a particular case. The disclosed methods can be used to decode seismic convolutive mixtures, underdetermined mixtures, and single mixture data. The algorithms disclosed here are designed for decoding multishot data and imaging both single shot data or decoded data and multishot data. The decoding process consists of reconstructing single shot gathers from multishot gathers, i. e. reconstructing data as if the acquisition were performed in the present fashion, in which waves are generated from a single shot location, and in which the response of the earth is recorded before moving on to the next shot location. The imaging process consists of reconstructing the model of the subsurface from either single shot data, or decoded data or directly from multishot data. The removal of multiple reflections due to bounces at the sea surface, the decomposition of data into upgoing and downgoing waves, and the decomposition of data into P wave and S wave reflections are all considered part of the imaging process.