Using 4D Seismic to Monitor Fluid Flow in a Heterogeneous and Compartmentalised Reservoir - Cases from the Heidrun Field

摘要

The use of 4D seismic data at the Heidrun Field has improved the understanding of reservoir fluid flow and communication across faults. Case studies from two well planning processes will be shown. The first example looks into the placement of a producer that was relying on pressure support from an existing water injector. Measurements in neighboring producers showed no pressure communication with the injector. However, interpretation of 4D data indicated possible fracturing of the injector, leading water into shallower layers and across faults into neighboring segments. This was later confirmed by a temperature log, leading to changes of the planned well. The second example looks at fluid front movement within a reservoir compartment, and how this can help interpreting intra-segment faults. Observations made through dynamic data were not very well matched in the reservoir simulation model for this particular segment. Combining interpretation of both 3D and 4D seismic data identified new internal faults which, when implemented in the model, gave a much better result and changed the strategy for the planning process of a new producer.