New reservoir simulation models have recently been established for the Snorre field based on updated geological models and fully revised input data. The Snorre reservoir is highly heterogeneous, comprising stratified and heavily faulted fluvial deposits. The field is pressure supported by water alternating gas (WAG) injection, resulting in complex drainage patterns.
Time-lapse seismic is amongst the technologies applied to improve reservoir understanding and has provided valuable information on fluid front movement and fault communication.
The paper describes a first systematic effort on honouring 4D data in the Snorre reservoir simulation models. A workflow converting 4D responses into 3D volumes in the reservoir modelling software for easy comparison to simulated reservoir performance proved very useful in the multidisciplinary work process. The models are history matched with respect to pressures, production rates and fluid front movement from tracer and 4D data. Though the seismic time-lapse responses are matched qualitatively, they have improved the overall Snorre reservoir understanding.
Different applications of 4D data in the history matching process are discussed, e.g. determining fault transmissibilities and water front movement, identifying water producing intervals and re-allocation of zonal contributions in wells. A successful water shut-off based on 4D interpretations and simulated future performance is also discussed.