4D Study in Middle-East Carbonate Field: How to Deal Intelligently with Noisy Data

摘要

Time lapse seismic or 4D seismic is a geophysical monitoring tool used by the industry to guide and maximize field development. It has been proven successful in many clastic deposit environments (Gulf of Mexico, Gulf of Guinea, North Sea…) but barely used operationally on carbonate fields. Major concerns are both on carbonate petrophysical sensitivity to pressure and saturation changes, and particularly in the Middle-East on the expected noisy seismic quality. In reality Truth is more complex and some cases emerge showing that good quality 4D seismic in carbonates is possible. The case study presented here belongs to the worst case family: random noise is high level due to very shallow streamer acquisition design during Base survey, and multiples are highly non repeatable and pollute the dataset. However the final result is an added-value and this paper aims to explain that a comprehensive interpretation mixing innovative QC tools and an integrated 2G&R interpretation can allow separating intelligently noise and 4D signal.