Deliverables Infami methodologies New methods and procedures for assessing fault seal effects on hydrocarbon migration and trapping have been defined. Methods for accurately incorporating the effects of fault seal into migration models have been defined. These methods and related software implementation provide a workflow for both predicting hydrocarbon distributions and conducting sensitivity analyses on estimated fault seal capacities and mapped fault structure. Some of the methods employed have been calibrated in case studies within the project, while others have been documented as possible methods or procedures in the report documentation. It is expected that scientific results from the project have general interest outside of the case study areas and will be presented at several conferences in the future. Fault seal property database A database containing available published and unpublished data on fault seal calibration has been compiled. The database relates the percentage shale in a sequence, which has moved past a point on a geological fault to the ability of the fault to form an effective seal to hydrocarbons. The database provides a basis for the estimation of the sealing capacity of faults in the subsurface in mixed sandstone/shale sequences. Its use within the Infami project has been to constrain the sealing parameters attached to faults in semi migration modelling. The Armada - dataset used in modelling a multiple carrier units The 'Armada' dataset, provided by BG, covers a 10x6km area of the Central North Sea Block 22/5B and includes the Seymour, Drake and Hawkins Fields. The Armada area has reservoirs at Triassic, Jurassic and Palaeocene levels and has provided an excellent dataset with which to test hydrocarbon migration models of multiple carrier systems. The dataset comprises a 3D seismic volume, interpretation of 3 reservoir horizons, source and other key surfaces over the study area, fault polygon interpretation on each surface, regional Jurassic depth map and regional source grids, 12 released wells, geological and stratigraphic model for the area and geochemical/PVT data from Hawkins, Drake and Seymour fields. Results of migration modelling on the dataset have the potential to contribute to planning future wells in this area. Extended single carrier modelling software The functionality of the Semi hydrocarbon migration modelling software package has been extended. The modelling software now incorporates fault capillary properties calculated from fault offsets and the nature of the faulted stratigraphy. The software has been extended to incorporate spatially variable stratigraphy and temporal variation in fault seal capacity due to changes in the density of the trapped hydrocarbon phase. A representative wells approach has been implemented using well areas. An interpolator calculates the distances to the nearest wells all over the study area and combines this with the top and base of the single carrier (for stratigraphic control) to provide variable fault seal attributes on all faults within the model area. The fault seal code has been incorporated in a Monte Carlo simulation approach that simplifies the study of sensitivities and uncertainties with respect to measured and modelled hydrocarbon contacts. The software extension is complete and is currently being applied to oilfield exploration data from a variety of settings. Semi is to our knowledge the only available software tool, which allows routine incorporation of fault seal attributes into migration modelling. The extended version provides hydrocarbon explorationists with an improved tool for routinely incorporating all of the available wells into migration models. Extended multi-carrier modelling software The functionality of the Semi3D multi-carrier hydrocarbon migration modelling software package has been extended. The modelling software now incorporates fault capillary properties calculated from fault offsets and the nature of the faulted stratigraphy. The software has been extended to incorporate spatially variable stratigraphy and temporal variation in fault seal capacity due to changes in the density of the trapped hydrocarbon phases. A representative wells approach has been implemented using well areas. An interpolator calculates the distances to the nearest wells all over the study area and combines this with the grids of horizons (for stratigraphic control) to provide variable fault seal attributes on all faults within the model area. The software extension is complete, using parallel computing via MPI, and is now able to account for fault seal between carriers of different age when modelling the migration of oil and gas into traps in a multi-carrier system. The extended version of Semi3D provides hydrocarbon explorations with an improved tool for incorporating all of the available wells into migration models. 3d datasets for faults in soft sediments 3D data volumes (~0.5cum) of faults offsetting poorly consolidated sediments have been constructed from photographs of serial sections (spaced ~ 0.5 cm) through cliff faces. Serial sections have been compiled, imported to TrapTester (Badley Geoscience) and the faults and offset horizons interpreted. The database highlights the complexity of internal structure of faults. Analysis of selected structures illustrates among other features, the complex propagation and growth of small displacement faults and the occurrence of smearing of sand units into faults, which may have a significant control on fault seal capacity. The compiled datasets will form the focus for research beyond the project completion. Searching for OpenAIRE data... There was an error trying to search data from OpenAIRE No results available
