Fault data

Fault data

 

Description

 

Here the data structures and keywords for Abaqus style input of Fault data are described. Fault data is used to identify which geometry entities correspond to faults. This is required for example in order to propagate a fault by fault insertion in a forward geological time scale basin simulation. In addition it allows to assign specific contact properties to faults.

 

 

Click to expand/collapseFAULT    Fault set data

Usage

*FAULT, NAME=Fault_name, TYPE=Single_or_Double, CONTACT PROPERTY=Property_name, CONTACT SET=Contact_set_name, INTERACTION=Self/All/List

Description

Defines geometry entities (lines in 2D, surfaces in 3D) as faults. This is used to create a ParaGeo Fault_set data structure once converted. The name of geometry sets that constitute the fault set should be provided in a list separated by commas in next line after definition of *FAULT keyword and its corresponding parameters.

 

Compulsory Parameters

NAME

Defines a name for the fault set so it can be referenced.

TYPE

Defines whether the fault set is represented in the geometry by a single or double surface. Valid values are:

- SINGLE

- DOUBLE

If set to SINGLE the surface will be split into two surfaces when conversion is performed.

 

 

Optional Parameters

CONTACT PROPERTY

Assigns a contact property (by name) to the fault set (Default: not used).

CONTACT SET

Assigns a contact set (by name) to the fault set (Default: not used).

INTERACTION

Defines the allowed interaction of the fault contact surfaces. Valid options are:

- SELF: Fault hanging wall can only interact with its corresponding fault footwall and vice-versa. Other contact surfaces will not be considered as potential contractors/targets

- ALL: (Default) Fault contact surfaces can interact with any other contact surface included in the same contact set

- LIST: Fault contact surfaces can interact with themselves and with any other contact surface provided in a list. See the examples for a reference on the list input format.

 

Examples

 

*FAULT, NAME=Fault1, TYPE=DOUBLE, CONTACT PROPERTY=Contact_fault1, CONTACT SET=Set_1

 Fault1_hgw, Fault1_ftw

 

1A fault set is defined for Fault1 which is formed by Fault1_hgw and Fault1_ftw (type is DOUBLE as hangingwall and footwall surfaces are separated)

2Contact property "Contact_fault1" is assigned to the fault set

3Contact set named "Set_1" is assigned to the fault set

 

*FAULT, NAME=Fault1, TYPE=DOUBLE, CONTACT PROPERTY=Contact_fault1, CONTACT SET=Set_1, INTERACTION=List

 Fault1_hgw, Fault1_ftw

*INTERACTION, NAME=Fault1_hgw

 Fault1_ftw, Detachment_ftw

*INTERACTION, NAME=Fault1_ftw

 Fault1_hgw

 

 

1Same case as above but fault interaction specified as a list

2Contact with Fault1_hgw is allowed for both Fault1_ftw and Detachment_ftw surfaces

3Contact with Fault1_ftw is only allowed for Fault1_hgw

 

 

Click to expand/collapseFAULT MERGE    Merge fault surfaces into single surface

Usage

*FAULT MERGE,  TOLERANCE=Value  

Description

*FAULT MERGE may be used to create a continuous model from a split model. It allows to define a list of pairs of Fault surfaces with coinciding nodes that will be merged to make a continuum volume.  If there is a slight difference in node coordinates for a fault pair of surfaces the TOLERANCE parameter may be set to increase the allowed distance. Note however that the nodes must be almost coincident and that both surfaces must have the same number of nodes. The corresponding fault pairs should be separated by commas and each pair should be specified in a new line.

 

 

Optional Parameters

TOLERANCE

Defines a tolerance distance between pairs of nodes for merge operation. The tolerance is expressed in absolute distance.

 

 

Examples

 

*FAULT MERGE

 Fault1_hgw, Fault1_ftw

 Fault2_hgw, Fault2_ftw

 Fault3_hgw, Fault3_ftw

 

 

1All listed pairs of fault surfaces will be merged to form a continuous volume.