Active Model

Use Constraints > Add Constraint > Active Model or Active Model > Modify to define which voxel elements of the provided constraint voxel model are adjusted during the inversion.

Modify Active Model Constraint dialog box options


Constraint type	By default All the elements of the voxel model will be adjusted during the inversion process in order to fit the observed data. Select Voxel to provide a voxel that defines the elements to be adjusted, and those not to be modified.
Filename	If the Voxel option has been chosen, you are prompted to provide the voxel that defines the elements of the voxel model representing the active region. This voxel model is re-gridded to the VOXI document mesh interval. If the VOXI document data type is MVI the amplitude component of an earlier inversion session can be used for this purpose.
Upper limit	The elements of the supplied voxel may have a dynamic distribution. If so, the elements with a value above this limit will not be adjusted, but will contribute to the calculation of the predicted response field. See Application notes for Limit reversal.
Lower limit	The elements of the supplied voxel may have a dynamic distribution. If so, the elements with a value below this limit will not be adjusted, but will contribute to the calculation of the predicted response field. See Application notes for Limit reversal.
Padding is active	Identify if padding elements are to be active.

By “active”, we mean those elements which can be updated by the inversion in the process of attempting to fit the data. The remaining voxel elements are “inactive” and remain fixed during the inversion.

Application Notes

The active voxel model identifies the volume under study that we intend to refine. It should be used in conjunction with the upper and lower limits. Voxel elements in the active voxel model with values between the defined lower and upper limit define the voxel elements that will be adjusted by the inversion process. The other elements will contribute to the field calculation, but will not be modified. However, if the lower limit is larger than the upper limit, the complement of the above will take place.

Access Seequent Online Learning and select the VOXI guided paths to learn more about effective workflows and key concepts.