We have developed an open source 3D, MATLAB based, resistivity inversion package. The forward solution to the governing partial differential equation is efficiently computed using a second-order finite volume discretization coupled with a preconditioned, biconjugate, stabilized gradient algorithm. Using the analytical solution to a potential field in a homogeneous half space, we evaluate the accuracy of our numerical forward solution and, subsequently, develop a source correction factor that reduces forward modeling errors associated with boundary effects and source electrode singularities. For the inversion algorithm we have implemented an inexact Gauss-Newton solver, with the model update being calculated using a preconditioned conjugate gradient algorithm. The inversion uses a combination of zero and first order Tikhonov regularization.
Jan 14, 2018 - 3d Resistivity Inversion Software Development. Epithermal Au-Ag and Porphyry Cu-Au Exploration (1) Date: 17-18 and 22 February 2018 Presenter/s: Greg Corbett and Stuart Hayward Cost: $1500 per person for three days| $750 Students and unemployed geologists Who should attend: Geologists who. Geomatrix can supply a range of software for editing and processing marine and land Geophysical datasets. Software for data processing, display and developing Lithology reports. View Products Electrical Resistivity. Sequencing, processing and inversion software for 1D,2D and 3D resistivity and IP datasets.
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Two synthetic examples demonstrate the usefulness of this code. The first example considers a surface resistivity survey with 3813 measurements. The discretized model space contains 19,040 cells. For this example, the inversion package converges in approximately 25 minutes on a 2.8 Ghz Pentium 4, with 4 Gb of RAM. The second example considers the case of borehole based data acquisition. For this example there were 4704 measurements and 13,200 model cells.
The inversion for this example requires 20 minutes of computational time.
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ERTLab™ is the 3D resistivity and chargeability inversion software that has radically changed the approach to electrical resistivity tomography (ERT) surveys, allowing full flexibility in the three-dimensional arrangement of the electrodes and creating the market of resistivity surveys around buildings. Available for both 32 and 64 bits platforms (with multi-threading capabilities), ERTLab™ is able to invert ERT measurements for any array geometry - surface, cross-hole or surface-to-hole. ERTLab™ makes use of Finite Elements algorithm for the accurate modeling of the terrain topography. Improve the way you perform resistivity and broaden the application of ERT surveys to new markets. Invert faster and manage huge sets of electrodes and measurements. Request a DEMO version. For the American market please refer to our partner and co-developer.