UBC-GIF


3D geophysical modelling and inversion programs.

"Advanced geophysical modelling and inversion programs that include solutions for: Gravity and Magnetic Gradient Data, Resistivity and Induced Polarization, and Electromagnetics."
Director, Xpotential Geoscientific Consulting

Industry-standard advanced geophysical modelling and inversion programs. Includes 3D modelling and inversion programs for gravity and magnetic gradient data, resistivity and induced polarization, and electromagnetics. Developed by the University of British Columbia Geophysical Inversion Facility as stand-alone, they can also be used within Geoscience ANALYST Pro Geophysics and GOCAD® Mining Suite. Many of the codes may be run directly from Geoscience ANALYST’s GIFtools utility; providing an extensive system of user interfaces to set up, execute, and interpret the results of the advanced geophysical forward modelling and inversion. They can also be run directly from GOCAD workflow interfaces for organizing and documenting process flow, as well as facilitating the incorporation of geological constraints.

The licence price depends on the version and geophysical software selection that is made to fit your individual needs best.The price of a licence depends on the software selection that is made to fit your individual needs best. Academic and non-profit licensing is also available.

Gravity and Magnetic Gradient Data

GRAV3D library is used for carrying out forward modelling and inversion of surface, airborne and/or borehole gravity data in 3D. The forward modelling is accomplished by using an integral equation approach on a tensor grid that computes and stores the (possibly compressed) sensitivity matrix. The inverse problem is solved as an optimization problem that minimizes the earth structure subject to adequately fitting the data and honouring additional specified constraints, including geological constraints that may be communicated directly from GOCAD Mining Suite models.

MAG3D library is used for carrying out forward modelling and inversion of surface, airborne and/or borehole magnetic data in 3D. Arbitrary combinations of field components in borehole, surface, and airborne surveys can be inverted simultaneously. The forward modelling is accomplished by using an integral equation approach on a tensor grid that computes and stores the (possibly compressed) sensitivity matrix. The inverse problem is solved as an optimization problem that minimizes the earth structure subject to adequately fitting the data and honouring additional specified constraints, including geological constraints that may be communicated directly from GOCAD Mining Suite models.

Resistivity and Induced Polarization

DCIP2D performs forward modelling and inversion of DC resistivity and IP data in 2D. All linear survey surface-array types, including non-standard or uneven arrays, can be inverted. It is compatible with dipole-dipole, pole-dipole, and pole-pole arrays. Wenner, Schlumberger, gradient and other arrays can all be inverted. Forward modelling for the DC resistivity is carried out using finite volume techniques on a tensor grid. The inverse problem is solved as an optimization problem that minimizes the earth structure subject to adequately fitting the data and honouring additional specified constraints, including geological constraints that may be communicated directly from GOCAD Mining Suite models.

DCIP3D performs forward modelling and inversion of DC resistivity and IP data over a 3D distribution of electrical conductivity and chargeability. The library works with the data acquired using general electrode configurations and arbitrary observation locations either on the earth’s surface or in a borehole. 3D surface topography is also fully incorporated in the modelling and inversion. Forward modelling for the DC resistivity is carried out using finite volume techniques on a tensor grid. The inverse problem is solved as an optimization problem that minimizes the earth structure subject to adequately fitting the data and honouring additional specified constraints, including geological constraints that may be communicated directly from GOCAD Mining Suite models.

Electromagnetics

EM1DFM inverts any type of geophysical frequency domain loop-loop EM data to find one of four types of 1D models, with one of four variations of the inversion algorithm. Many permutations of model type, data type, and algorithm choice are possible. The inverse problem is solved as an optimization problem that minimizes the earth structure subject to adequately fitting the data and honouring additional specified constraints, including geological constraints that may be communicated directly from GOCAD Mining Suite models.

EM1DTM inverts geophysical time domain EM data (B or dB/dt) from inductive sources to recover a 1D conductivity profile of the earth. The model objective function can be varied to provide models that range from ‘smooth’ to ‘blocky’ in accordance with the assumed geology. Variable strategies for estimating the trade-off parameter to balance the model structure and data misfit are provided. The program runs using an interface that allows multiple soundings to be stitched together into a profile. The inverse problem is solved as an optimization problem that minimizes the earth structure subject to adequately fitting the data and honouring additional specified constraints, including geological constraints that may be communicated directly from GOCAD Mining Suite models.