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Analysis of Water Column Complexity in OBN Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 74th EAGE Conference and Exhibition incorporating EUROPEC 2012, Jun 2012, cp-293-00358
- ISBN: 978-90-73834-27-9
Abstract
Ocean Bottom Node (OBN) acquisition requires a very detailed understanding of the shot and receiver positions, receiver timing, and water column velocities. Knowledge of the water column velocities is necessary for processing and accurate imaging of OBN data. Processes that refine the shot positions, receiver positions, receiver timing, and water column velocities individually are subject to leakage of errors in the other domains. A process must be used that refines all values simultaneously. A traveltime inversion process is shown on an example deep water dataset. The lessons learned for preparing the data and conditioning the variables in the traveltime inversion process are shown. The result of the inversion is a detailed time and depth dependent water column velocity model, correct shot and receiver positions, and accurate receiver timing. These results are necessary for regularization, designature, and imaging of OBN data, and vital for full exploitation of 4D analysis.