FracMan file (.fab) description

Contents

A brief description of the FracMan (.fab) file containing the fractures is provided. The file for the present tutorial case is named frac_sample.fab and was originally exported from Petrel.

The present file contains a single fracture set with data for a total of 14 fractures.

Fracman file description

Format Definition

The format is defined between BEGIN FORMAT and END FORMAT commands.

Data File

BEGIN FORMAT

Format = Ascii

Length_Unit = M

XAxis = East

Scale = 1168

No_Fractures = 14

No_TessFractures = 0

No_Nodes = 56

No_RockBlocks = 0

No_NodesRockBlock = 0

No_Properties = 3

END FORMAT

1.The FORMAT data is used to define the parameters defining the format of the data in the present FracMan file. In this case the parameters are as follows:

▪ASCII format defined

▪Length units in meters

▪XAxis direction pointing towards the East boundary

▪Scale

▪14 fractures will be defined in the present file

▪No tesselated fractures are defined

▪The number of fracture nodes is 56 (4 per fracture)

▪No rockblocks are defined in the present file

▪No nodes for rockblocks are defined in the present file

▪Three fracture properties are defined in the present file

Properties Definition

The fracture properties that will be defined for each fracture in the FracMan file are listed between BEGIN PROPERTIES and END PROPERTIES commands. Note that these properties will be ignored for the cases described in the next sections.

Data File

BEGIN PROPERTIES

Prop1 = (Real*4)"Permeability"

Prop2 = (Real*4)"Compressibility"

Prop3 = (Real*4)"Aperture"

END PROPERTIES

1.The three fracture properties with values exported from Petrel are:

▪Permeability

▪Compressibility

▪Aperture

Sets definition

The list of fracture sets in the present file are defined between BEGIN SETS and END SETS commands.

Data File

BEGIN SETS

Set1 = "Discrete fractures"

END SETS

1.All the fractures in the current file belong to a single fracture set named "Discrete fractures".

Fracture definition

Fracture data is defined between BEGIN FRACTURE and END FRACTURE commands.

Data File

BEGIN FRACTURE

1 4 1 0.10132E+18 1.0000 0.10000E-03

1 815.9937988 85.71030241 9.40000

2 781.1103675 114.7706697 9.40000

3 781.1103675 114.7706697 22.6000

4 815.9937988 85.71030241 22.6000

0 0.9101021580 0.4143839550 0.00000

2 4 1 0.10132E+18 1.0000 0.10000E-03

1 831.2601464 87.17631025 13.8000

2 773.5171253 125.9539958 13.8000

3 773.5171253 125.9539958 24.8000

4 831.2601464 87.17631025 24.8000

0 0.8707099350 0.4917969190 0.00000

(...)

14 4 1 0.10132E+18 1.0000 0.10000E-03

1 810.7987773 144.3451794 9.4000

2 897.2128303 162.7480291 9.4000

3 897.2128303 162.7480291 22.600

4 810.7987773 144.3451794 22.600

0 0.4895612360 -0.8719689190 0.0000

END FRACTURE

1.Data for the first, the second and the last fractures are displayed here, separated by blank lines to facilitate visualisation. The different data sections for the first fracture are highlighted in different colors to facilitate their description.

2.In the yellow row there are 6 numbers indicating:

▪Unique fracture ID number

▪The number of nodes defining the fracture (4 in this case)

▪Fracture type

▪Value set in Petrel for Prop1 (permeability)

▪Value set in Petrel for Prop2 (compressibility)

▪Value set in Petrel for Prop3 (aperture)

Note that only the two first numbers in the yellow row (ID number and number of nodes) are relevant for the workflow described here.

3.In each of the blue rows there are 4 numbers indicating the fracture node number and its X, Y, Z coordinates.

4.In the pink row the first number is a 0 and indicates the last row of data for the current fracture followed by 3 numbers which are the X, Y , Z components of the normal direction to the fracture.