Patent ID: 6865487
Filing Date: 2005-03-08
Classification: G01V

Abstract:
1. Method for decimating seismic traces in an acquisition of 3D data, comprising: recording, for each trace, the coordinates of the corresponding source-receiver couple (S later regrouping all the source-receiver couples into iso-path trace collections, where each collection regroups traces whose seismic paths are identical or similar, characterized in that it consists in positioning on a decimation grid (D), divided into cells, the source-receiver couple that corresponds to each trace, where the positioning phase of the source-receiver couples of each trace consists for each trace in: locating the source cell of the decimation grid (D) in which the source (S recording the coordinates (x, y) of the four nodes (S locating the receiver cell of the decimation grid in which the receiver (R recording the coordinates (x, y) of the four nodes (R organizing the traces in each iso-path collection and selecting the first trace in each iso-path collection, where the regrouping phase of the source-receiver couples in collections of iso-path traces consists in: calculating for each trace, the corresponding offset (S putting each node of the source cell in relation with each node of the receiver cell, where the sixteen combinations obtained (S calculating for each of said sixteen combinations, the corresponding offset (S extracting from the sixteen couples (S performing the same operations as above with all the acquired traces whose source and receiver are respectively located in the same source cell and receiver cell, so as to create iso-path collections.