Recent improvements for Quantitative 4-D Seismic
Born nearly thirty years ago, time lapse (4D) seismic technology is today a common tool for reservoir monitoring and is the only one that provides a spatial image of field production. Its ultimate aim is to quantitatively improve the predictive capability of reservoir models, and finally optimize the reservoir management.
For the last ten years, Total has recognised the importance of time lapse seismic and has therefore conducted 4D seismic monitoring studies in different geological environments and for different monitoring purposes. Key 4D innovations were developed to meet monitoring needs:
Several 4D field examples are shown to illustrate the use of these main technologies.
Thank to these recent improvements 4D becomes a mandatory tool to assess the monitoring of production phenomena in more difficult domains where 4D signal is weaker or where 4D noise is stronger as carbonates fields, onshore fields, subsalt fields. Positive results have been obtained on some offshore carbonates fields where 4D contributed to assess subsidence of carbonate platforms, water rises, depleted areas, facies quality, permeability barriers and fault behaviour. As well positive results have been obtained on overburden knowledge (compaction, HSE, well integrity) that fit with the results of geomechanical modeling and geological heterogeneities characterization.
This discipline requires full geosciences integration between 4D seismic interpretation, Rock Physics, Sedimentology, Well monitoring data and Reservoir simulation.
AAPG Datapages/Search and Discovery Article #90260 © 2016 AAPG/SEG International Conference & Exhibition, Cancun, Mexico, September 6-9, 2016