Sedimentation_data
Contents
Data Structure: Sedimentation_data |
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Description |
Defines the data to action Deposition of new Sediment |
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Sedimentation_data NUM=ival where ival is the data structure number |
Description |
Overview Sedimentation_data is the primary data structure for definition of sedimentation of a new stratigraphy unit or for deposition of additional material on the current top surface of the model. Several different algorithms are available for definition of the new top surface of the model and when a new stratigraphy unit is created. The Sedimentation_horizon and Sedimentation_loading data structure is also generally required.
Notes •The additional geometry associated with new stratigraphy unit is added at the Initiation_time and the deposition algorithm will always be Lagrangian; i.e. the material will be added fully at the sedimentation time but the loads associated with the new sediment will be ramped up over the specified Duration. •When new material is deposited by growing the current stratigraphy unit it will be added using an Eulerian algorithm. In this method the Sedimentation_horizon is defined as a continuous movement and any surface horizon node that lies below the horizon is moved vertically so that it lies on the Sedimentation_horizon.
•One Sedimentation_data structure is defined but it can be respecified for each stage.
Examples demonstrating the usage of Sedimentation_data include: •dep_*.dat
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 | Stratigraphy_unit_name Stratigraphy unit name |
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Name of the stratigraphy unit that is going to be sedimented.
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| Sedimentation_type Sedimentation horizon type ('Absolute','Relative','Drape','Isopach','Structure') |
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Defines the type of algorithm to be used for sedimentation. Valid types are: • "Absolute" - (Default) A sedimentation horizon must be defined (via Sedimentation_horizon) which fully defines the geometry of the surface of the deposited sediment. The surface of the deposited sediment is defined by the previous top surface, the projection of the lateral boundaries and the current position of the sedimentation horizon. • "Relative" - A sedimentation horizon must be defined (via Sedimentation_horizon) together with the layer thickness ( Reference_thickness) and reference location ( Reference_location). The sedimentation horizon is then positioned so the vertical thickness is correct at the reference location. The surface of the deposited sediment is defined by the previous top surface, the projection of the lateral boundaries and the current position of the sedimentation horizon. • "Drape" - Where a uniform thickness of material is added across the complete model. In this case only the thickness of the layer ( Reference_thickness) is required. • "Isopach" - A sedimentation horizon must be defined (via Sedimentation_horizon). The nodes of the sedimentation horizon then provide a set of reference locations (x coordinate) and thicknesses (y coordinate) that will define the geometry of the new deposited sediment on top of the model. It should be emphasised that the Y coordinates of the assigned sedimentation horizon are relative to the top surface to provide the deposited sediment thickness at each location. • "Structure" - Base layer is a structured mesh. All new mesh layers created (via Sedimentation_horizon) are also structured mesh.
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| Sediment_horizon_number Sedimentation horizon number |
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Defines the sedimentation horizon number. A sedimentation horizon is required for the "Absolute", "Relative", "Isopach" and "Structure" sedimentation types.
Notes •If Sediment_horizon_name is specified then Sediment_horizon_number is not required. Sediment_horizon_name is the preferred keyword to use.
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| Sediment_horizon_name Sedimentation horizon name |
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Defines the sedimentation horizon name. A sedimentation horizon is required for the "Absolute", "Relative", "Isopach" and "Structure" sedimentation types.
Notes •If Sediment_horizon_number is specified then Sediment_horizon_name is not required. However, Sediment_horizon_name is the preferred keyword to use.
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| Initiation_time Sedimentation initiation time |
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Defines the time for the start of sedimentation (Default: current time). This is the time when sedimentation will be initiated and the geometry and mesh for the new deposited layer will be created.
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| Duration Sedimentation duration |
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Defines the sedimentation duration. This is the total time associated with the sedimentation process. The duration defines the time over which loading associated with sedimentation (e.g. gravity) is applied.
Notes •The sedimentation duration cannot last beyond the end of the current control stage. If it is defined longer than the current control stage duration, the duration for the current sedimentation event will be set to finish at the end of the current control stage.
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| Number_steps Number of sub-sedimentation increments |
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Number of sub-sedimentation increments. For example, if a sediment thickness of 300m is to be deposited over 1.5Ma and Number_steps is set to 3, then the deposition will be split and carried out in 3 increments of 100m of 0.5Ma duration each.
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| Material_number Sedimentation material number |
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Defines the material ID number to be assigned to the sedimentation material. Either the Material_number or Material_name must be defined, the preferred keyword being Material_name. The material to be assigned must be defined via Material_data.
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| Material_name Sedimentation material name |
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The name of the material to be assigned to the sedimentation material. Either the Material_number or Material_name must be defined, the preferred keyword being Material_name. The material to be assigned must be defined via Material_data.
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| Material_file Material file containing material data |
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The name of the file (including file extension) containing the material data. Only required if the material data is defined in a separate .mat file that has not been included in the current material data file via Include.
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| Facies_id Facies ID number |
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Facies ID number to be assigned to the sedimentation group. Alternatively the group may be assigned a material via Material_name.
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| Kerogen_assignment Name of Kerogen property data |
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Assigns a kerogen property (by name) to the sedimentation group.
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| Reference_group_number Sedimentation group number |
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The reference group is used to define the group options; i.e. element type, porous flow options, etc., that will be used when the group for the new sediment is created. The reference group can be specified by either Reference_group_number or Reference_group_name, the preferred keyword being Reference_group_name. If the reference group is not specified the first active group will be used.
Notes •The reference group must be an existing group defined in the data input but it does not necessarily have to be active in the model. •The group number of the sediment group is automatically assigned a number greater than the maximum group number of the existing groups. •The group name is automatically assigned to be the stratigraphy unit name ( Stratigraphy_unit_name ).
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| Reference_group_name Sedimentation group name |
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The reference group is used to define the group options; i.e. element type, porous flow options, etc., that will be used when the group for the new sediment is created. The reference group can be specified by either Reference_group_number or Reference_group_name, the preferred keyword being Reference_group_name. If the reference group is not specified the first active group will be used.
Notes •The reference group must be an existing group defined in the data input but it does not necessarily have to be active in the model. •The group number of the sediment group is automatically assigned a number greater than the maximum group number of the existing groups. •The group name is automatically assigned to be the stratigraphy unit name ( Stratigraphy_unit_name ).
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| Reference_thickness Layer thickness ('Drape' or 'Relative' cases) |
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Defines the thickness of the new sediment layer for the "Drape" and "Relative" sedimentation types. •"Thickness" - Layer thickness
Notes •For the "Relative" sedimentation type, the reference thickness defines the thickness at the reference location specified via Reference_location.
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| Minimum_thickness Minimum layer thickness |
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The minimum layer thickness below which no sedimentation will occur; i.e. if the evaluated layer thickness at a location is less than the minimum layer thickness no sediment will be deposited. Specification of a minimum layer thickness therefore prevents excessively thin elements being deposited in the model. If a minimum layer thickness is not specified then a default value is computed based on the target element size.
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| Mesh_size Mesh size for generation of new stratigraphy |
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Defines the target element size when generating the mesh for the deposited sediment. If the target mesh size is not specified, it is computed automatically based on the mesh size of the existing sediment.
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| Reference_location Reference location for thickness offset evaluation |
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Reference location for thickness offset evaluation for the "Relative" sedimentation type. The reference location is defined by:
2-D • Location 1 - X coordinate
3-D • Location 1 - X coordinate • Location 2 - Y coordinate
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| Time_curve Time curve name or number for gravity loading during sedimentation |
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Assigns a time curve to ramp up gravity during the sedimentation process. If a load curve is not assigned then the following will apply: •If a load curve is assigned in Gravity_data, this load curve will be used but with time scaled to the the sedimentation duration. •If a time curve is not assigned in Gravity_data, an S Curve over the sedimentation duration will be used.
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| Side_boundary_parts Part geometry defining the side boundaries of the model during sedimentation |
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If Side_boundary_parts is specified, then the side boundaries of the newly deposited material will be defined by a set of geometry part surfaces. This option is generally used when the side boundary deformation is defined using prescribed boundary conditions (also defined using the same part geometry data structures). Currently this option is only available in 3-D.
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| Side_boundary_geom Geometry set defining the side boundaries of the model during sedimentation |
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Side_boundary_geom is used in conjunction with Side_boundary_parts.
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| Thermal_advection_flag Flag to include thermal convection terms |
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Defines whether thermal convection is considered for the deposited unit. Valid values are: • 0 - Do not include convection terms • 1 - Include convection terms with Petrov/Galerkin streamline upwinding (default) • 2 - Include convection terms without Petrov/Galerkin streamline upwinding
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| Geostatic_set_name Name of geostatic data set to be applied to deposited sediment |
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Name of geostatic data set to be applied to deposited sediment. By default no geostatic conditions are applied.
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| Erosion_type Erosion type |
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Defines the erosion type to be considered during the current depositional event. Valid values are:
2D Models • 0 - No erosion (default) • 1 - Consider erosion for sediment exposed above the sedimentation horizon combined with deposition in the accomodation space between sedimentation horizon and current top surface. The load associated to the weight of the eroded sediments is ramped down over the sedimentation duration. • 2 - Erosion without deposition (2D only)
3D Models • 0 - No erosion (default) • 1 - Consider erosion for sediment exposed above the sedimentation horizon combined with deposition in the accomodation space between sedimentation horizon and current top surface. The load associated to the weight of the eroded sediments is ramped down over the sedimentation duration.
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| Num_struct_divisions Number of element divisions through the depth for 'Structure' type mesh deposition |
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Number of element divisions through the depth for "Structure" type mesh deposition ( =1 default).
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| Layer_merge_flag Merge last two layers of elements before deposition |
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Flag to define whether the last two layers / formations should be merged into a single formation before deposition. Valid values are: • 0 - no merge (default) • 1 - Merge before deposition • 2 - Merge only without any deposition
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| Isopach_option_flag Isopach deposition option for creating sedimentation horizon |
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The default method to use an isopach sedimentation horizon is by converting top surface topology to a sedimentation horizon by adding the isopach thickness. An optional way to create sedimentation horizon is using the input sedimentation facet topology which in some cases may help if the top surface topology is too distorted. Valid input values are: • 0 - Standard method (default); • 1 - Optional method.
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| Couple_horizon_flag Coupled horizon flag |
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This flag allows the newly sedimented horizon to be applied couple freedoms in the vertical direction to remain flat. It can be used to improve the stability of column deposition analysis with coarse meshes. Valid input values are: • 0 - Do not apply couple freedoms to the new top surface (default) • 1 - Apply couple freedoms in the vertical direction to the new top surface
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| Formation_group_for_merge Name of the formation group to merge |
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Formation_group_for_merge specifies the name of the formation group to merge. This must be defined in conjunction with Faults_for_merge.
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| Faults_for_merge List of fault names for merging |
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List of fault unit names defined for fault merge.
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| Spatial_grid_facies Spatial grid name for assigning facies distribution to deposited unit |
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Defines the name of the spatial grid (of type "mesh_external") used to assign facies distribution to the sedimentation layer.
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| Facies_grid_file Facies grid file name for forward modelling |
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Specifies the name of the facies grid file for forward modelling.
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| Output_flag Flag for output of plot file after sedimentation |
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Flag for output of plot file after sedimentation. Valid values are: • 0 - Do not output plot file after sedimentation (default) • 1 - Output plot file immediately after sedimentation
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| Isolated_element_flag Flag for removal of isolated elements during deposition |
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Flag for removal of isolated elements during deposition (currently only for structured hexahedral meshes). Valid values are: • 0 - Do not remove isolated deposited elements • 1 - Remove fully isolated deposited elements (Default) • 2 - Remove fully isolated or elements connected to a single element
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| Minimum_patch_area Minimum area of deposition patches |
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Minimum area of deposition patches (default: not used)
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| Deposition_patch_removal List of patches to be removed |
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List of patches to be removed
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| Sedimentation_regions List of sedimentation regions |
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List of sedimentation regions
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