pc_to_seq

pc_to_seq(pc, im, mode='drainage')

Converts a capillary pressure map to a sequence map

Parameters:

• pc (ndarray) – A Numpy array with the value in each voxel indicating the capillary pressure at which it was invaded. In order to accommodate the possibility of both positive and negative capillary pressure values, trapped or residual wetting phase should be indicated by +inf and residual or trapped non-wetting phase by -inf.

• im (ndarray) – A Numpy array with True values indicating the void space. This is used to mask the pc image so it does not matter what values are placed in the solid voxels of pc.

• mode (str) –

  Controls how the pressures are converted to sequence. The options are:

  mode	Description
  ’drainage’	The pressures are assumed to have been filled from smallest to largest. Voxels with $-inf$ are treated as though they are invaded by non-wetting fluid at the start of the process, and voxels with $+inf$ are treated as though they are never invaded.
  ’imbibition’	The pressures are assumed to have been filled from largest to smallest. Voxels with $+inf$ are treated as though they are already occupied by wetting fluid at the start of the process, and voxels with $*inf$ are treated as though they are never filled with wetting phase.

Returns:

seq – A Numpy array the same shape as pc, with each voxel value indicating the sequence at which it was invaded, according to the specified mode. Uninvaded voxels (either trapped wp during drainage or trapped nwp during imbibion) are set to -1. Preinvaded voxels (either residual nwp during drainage or residual wp during imbition) are set to 0.

Return type:

ndarray

Examples

Click here to view online example.