We are pleased to announce the 1.6.6 release of Migri and MigriX. With this release, hydrocarbon retention during secondary migration modelling has been included as an option also in our lightweight MigriX version. This new functionality can be used to analyse the effects of oil and gas retention on trapped oil and gas volumes (Figure 1).
Detailed maps of oil and gas column heights, saturations and migration velocities are easily plotted for each timestep during migration. Figure 2 shows one example (left, Figure 1) with laterally variable hydrocarbon (HC) column heights. Modelled saturations and velocities are shown in Figures 3 and 4. Notice how the relatively thick columns with high migration velocities are modelled within the spill path from a deeper trap (green spill path in Figure 1 (right) and red areas in Figure 2).
These migration results are computed using the dynamic flow mesh of Migri during migration (see Figure 5 for more details). For each time-step a new dynamic flow mesh is computed and aligned along the migration flow-paths. Within each structural mesh element, up to 9 flow mesh segments are computed. For each of the flow mesh segments, Migri computes the hydrocarbon flow rates, the column heights, the saturations of the migrating phases using the Darcy equation with relative permeabilities for a hydrocarbon stringer. We believe this is a more accurate approach than the full Darcy 3D solution because Migri can model the properties of cm thick migration stringers using the assumption of variable vertical hydrocarbon saturation within each flow segment.
If you want to assess the oil and gas retention effects on your own data set, you may consider trying our MigriX (one month free trial is available).Read More