Case06 Contact flow conductivity multiplier

 

The initial data file for the project is: Cont_002\Case06\Data\Cont_002_Case06.dat.  

 

The basic datafile definition is very similar to the previous cases. In this case the contact normal flow conductivity is defined as a function of depth. Hence minimal stratigraphy data identifying top surface need to be included. Note that in this case fault angle has been increased so that the fault has depths ranging from 500m to 3500m thus facilitating demonstration of model usage.

 

For more information about contact mechanics see Overview of Contact in ParaGeo and for contact data definition see Contact Data.

 

Contact_property

Data File

 

 

* Contact_property                  NUM=1

! ----------------------------------------

 Name                           "Sand_contact"

 Compression_model                           1

 Compression_properties IDM=1

  /Normal Penalty/                       5000

 Tangential_model                            2

 Tangential_properties IDM=2

  /Tangential Penalty/                     10

  /Friction coefficient/                  0.1

Flow_model_normal           6 ! Conductivity multiplier (Factor*material perm/viscosity)

 Flow_properties_normal IDM=2

  /"Fluid Cond. (Contact) factor"/       1000    

  /"Fluid Cond. (Filter Cake) factor"/   1000    

Flow_model_tangential       6 ! Conductivity multiplier (Factor*material perm/viscosity)

 Flow_properties_tangential IDM=1    

  /"Fluid Cond. (Penalty) factor"/       1000

 Thermal_model_normal                 1 ! 1- Constant conductivity

 Thermal_properties_normal IDM=2

   /"Therm. Cond. (Penalty)"/        12.6144E+13  

   /"Therm. Cond. (Filter Cake)"/    12.6144E+13

 Contact_width   0.001

 

 

 

* Material_data                    NUM=1

! ---------------------------------

 (...)

 Permeability_type                    1

Permeability                     1E-21                

 (...)

 

 

 

* Fluid_properties          

! ---------------------------------

 Name                               "Water"

 (...)

 Viscosity_type                           1  

Viscosity                        3.171E-23  

 (...)

 

1The Flow_model_normal and Flow_model_tangential are set to 6 (fluid conductivity multiplier model).

2A conductivity muliplier factor of 1000 is set for both tangential and normal contact flows.

3For the model defined material perm of 1E-21m2 and fluid viscosity of 3.171E-23 MPa.Ma, fluid conductivity = factor*material perm/viscosity, i.e. 1000 * 1E-21 / 3.171E-23 = 31536. We would expect to recover this value for both normal and tangential conductivities in the results.

 

 

 

 

 

Results

 

The results for the project are in: Cont_002\Case06\Results.

 

In the results below it can be seen that both the normal and tangential conductivity values of 31536 (as expected) are recovered from utilising the conductivity multiplier model with factor of 1000.

(Conductivity = factor*material perm/viscosity, i.e. 1000 * 1E-21 / 3.171E-23 = 31536, where fluid conductivity multiplier factor = 1000, material perm = 1E-21m2 and fluid viscosity = 3.171E-23 MPa.Ma).

 

 

Cont_002_case06_01

Pore pressure contours and fault normal and tangential flow conductivities (via contact multiplier) at two simulation times.