`NTG`

Recognised by the OPM Flow parserGRID

NTG defines the Net-to-Gross Ratio (“NTG”) for all the cells in the model via an array. The keyword can be used with all grid types.

Notes:

Setting a cells NTG value to zero will make the cell inactive, similar to setting the cells ACTNUM property to zero.

The keyword is terminated by a “/”.

See also the PORO, PERMX, PERMY and PERMZ keywords to fully define a grid’s properties.

Records: An array of values covering the grid

Parameters

No.	Name	Description	Field	Metric	Lab	Default
1	`NTG`	NTG is an array of real numbers greater than or equal to zero and less than or equal to one, that are assigned the net-to-gross ratio values for each cell in the model. The number of entries should correspond to the NX x NY x NZ parameters on the DIMENS keyword. Repeat counts may be used, for example 200*0.850.	dimensionless	dimensionless	dimensionless	None

Example

--
-- DEFINE GRID BLOCK NTG DATA FOR ALL CELLS (BASED ON NX x NY x NZ = 300)
--
NTG
100*1.000 100*0.850 100*0.500 /
The above example defines a constant NTG of 1.00 for the first 100 cells, then 0.85 for the second 100 hundred cells, and finally 0.500 for the last 100 cell, for the 300 cells in the model as defined by the DIMENS keyword in the RUNSPEC section.

Manual source: parts/chapters/subsections/6.3/NTG.fodt