DAELLIPS Process

To access this process:

See this process in the Command Table.

Process Overview

Create ellipsoids from dynamic anisotropy points or model.

Input is either a points or a block model file (not both).

Typically, points data will be created by the ANISOANG process in Studio RM, although it can be from other sources. An input points file must contain coordinate fields (XPT/YPT/ZPT) and at least one angle field. Up to three angle fields can be specified, representing the dip direction (DIPDIR), dip (DIP) and roll (ROLL). Providing at least one directional field is set, the remaining orientations can be static and specified using the @DIPDIR, @DIP and/or @ROLL field.

Model data will typically be as produced by Studio RM's anisotropic modelling functions. As with points, each cell record must contain at least one angle field.

Ellipsoid centroids, derived from either &POINTS or &MODEL can be optionally declustered (multiple options) and 3 radii are specified to determine the final ellipsoid shape. @XGRID, @YGRID and @ZGRID parameters will define the declustering grid (if declustering is applied). The original of the grid can be specified (@XORIG, @YORIG and @ZORIG) if the input data is of the points type.

You can also choose (@CENTRE) as to how the ellipsoid centroid is positioned, either at the point or subcell centroid (0) or on the centre of the grid or the parent cell within which the point lies.

In all cases, output will be a data file of the Ellipsoids data type, and can be loaded into a 3D view to visualize ellipsoid location(s) and orientation(s).

Input Files

Name

Description

I/O Status

Required

Type

POINTS

Angle data in points format created by ANISOANG. It must include XPT, YPT, ZPT and at least one angle field. Either a POINTS or a MODEL file must be selected but not both.

Input

Yes, if &MODEL not specified

Points

MODEL

Angle data in model format created during dynamic anisotropy modelling. It must include at least one angle field. Either a POINTS or a MODEL file must be selected but not both.

Input

Yes, if &POINTS not specified

Block Model

Output Files

Name

I/O Status

Required

Type

Description

ELLIPSES

Output

Yes

Ellipsoid

Output ellipsoids. Ellipsoids to be displayed in the 3D Window.

Fields

Name

Description

Source

Required

Type

Default

DIPDIR

A field in the POINTS or MODEL file that includes the dip direction angle.

MODEL

No

Undefined

Undefined

DIP

A field in the POINTS or MODEL file that includes the dip angle.

MODEL

No

Undefined

Undefined

ROLL

A field in the POINTS or MODEL file that includes the roll angle.

MODEL

No

Undefined

Undefined

Parameters

Name

Description

Required

Default

Range

Values

DECLUST

Flag to select declustering option. Default (0).

0:do not use declustering.

1:random selection within each grid cell (different selection for each run).

2: pseudo random selection within each grid cell (repeatable)..

3: nearest to grid centre.

No

Yes

0,3

0,1,2,3

RAD1/2/3

Ellipsoid radius in X/Y/Z direction.

Yes

10

Numeric

Undefined

FACTOR

Dividing factor for adjusting size of RAD1, RAD2 and RAD3.

Yes

1

1

1

DIPDIR/DIP/ROLL

Dip direction, dip or roll angle. Only required if there is no corresponding DIPDIR, DIP or ROLL field specified.

No if DECLUST=0, otherwise yes

0

Numeric

Undefined

X/Y/ZGRID

Size of declustering grid in X/Y/Z direction. Not required if @DECLUST=0 or input file is MODEL.

No if DECLUST=0, otherwise yes

10

Numeric

Undefined

X/Y/ZORIG

X/Y/Z coordinate of grid origin. Not required if @DECLUST=0 or input file is MODEL. Default (0).

No if DECLUST=0, otherwise yes

0

Numeric

Undefined

CENTRE

Flag to define where the ellipsoid should be located. Only required if @DECLUST > 0.

0: centre the ellipsoid on the coordinates of the point or subcell centre.

1: centre the ellipsoid on the centre of the grid or parent cell within which the point lies. .

No if DECLUST=0, otherwise yes

1

0,1

0,1