DCIP2D performs forward modelling and inversion of DC resistivity and IP data in two dimensions and is a program for carrying out forward modelling and smooth inversion.
All linear survey surface-array types, including non-standard or un-even arrays, can be inverted. However, the GUI only works with dipole-dipole, pole-dipole and pole-pole arrays. Wenner, Schlumberger, gradient, and other arrays can all be inverted but the user interface does not yet handle those types of arrays.
DCIP2D is a program for carrying out forward modelling and inversion of DC resistivity and induced polarization data in two dimensions. The research was funded principally by the mineral industry consortium "Joint and Cooperative Inversion of Geophysical and Geological Data" which was sponsored by the Canadian National Science and Engineering Research Council (NSERC) and the following 11 companies: BHP Minerals, CRA Exploration, Cominco Exploration, Falconbridge, Hudson Bay Exploration and Development, INCO Exploration & Technical Services, Kennecott Exploration Company, Newmont Gold Company, Noranda Exploration, Placer Dome and WMC.
The theoretical framework for DCIP2D is provided in the paper: Oldenburg, D.W, and Li, Y., 1994, Inversion of Induced Polarization Data, Geophysics, vol 59 p 1327-1341.
All linear survey surface-array types, including non-standard or un-even arrays, can be inverted. The only limitation is that the mesh must be designed so that electrodes are on mesh nodes. This must be remembered if horizontal distances are not regular, such as when line positions were not corrected for topography.
The GUI works well with dipole-dipole, pole-dipole and pole-pole arrays. Wenner, Schlumberger, gradient, and other arrays can all be inverted but the user interface does not yet handle those types of arrays. See the GUI instructions for details.
Inversion for a 2D model of the earth implies that data were gathered along a survey line at the surface. DCIP2D considers the subsurface in terms of a mesh of rectangular cells. In terms of size, there are usually two cells between electrode positions, and cells are half as thick as their width. There must be several cells of increasing size on all three sides outside the region where current has been injected.
The program provides all the tools to build the starting models, run the inversion and view the results.