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- Converting res2dinv files to res3dinv files update#
- Converting res2dinv files to res3dinv files software#
Exit, save modified data, reloadĤ9 Processing / removal of outliers statistical Statistical: Manual:ĥ0 Processing / removal of outliers statistical Pitfalls of statistical processing: The removal of data points is solely based on how well they are fitted by the inversion By removing data points with a high misfit we are feeding the inversion what it wants and can create artificially god data fits That a datapoint isn t fitting doesn t necessarily mean that it is wrong, it can also be due to: 1.
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Select the datapoints to remove using arrow keys 4. Select Edit data->rms error statistics 3. Go to display mode and load.inv file after inversion 2.
Converting res2dinv files to res3dinv files update#
IP = induced polarization Processing = preparation of data before inversion Inversion = computation of geophysical model (resistivity and chargeability distribution) from measured dataĤ Theory Ohm s law General formulation: R = V I Geophysicists formulation: ρ a = k ΔV MN I AB, k = 2π 1 AM 1 BM 1 AN 1 BNĥ Theory Ohm s law ρ a = k ΔV MN I AB, k = 2π 1 AM 1 BM 1 AN 1 BNĦ How does current flow in the ground? There are 3 main modes of current conduction in the subsurface, these are described by Archie's law: Bulk water Surface conduction Surface polarizationħ Archie s law: 3 current paths bulk water σ = 1 F σ W surface conduction σ = σ surf surface (grain) polarization σ = iσ surf E E EĨ Archie s Law σ = bulk water 1 F σ W surface conduction + σ surf surface polarization + iσ surfġ0 Sensitivity distribution of different configurationsġ6 Inversion theory What do we want? A model of the resistivity distribution of the subsurface:ġ7 Inversion theory how do we get there Starting model Forward calculation Comparison of forward calculation and measured data, is stopping criterion reached? No Yes Done! Update starting modelġ8 Inversion theory looks easy why is it so hard? Starting model Forward calculation Comparison of forward calculation and measured data, is stopping criterion reached? No Yes Done! Update starting modelġ9 Induced polarization Induced polarization is the polarization of the subsurface as a result of the transmitted current The measurement and inversion principles for induced polarization are very similar to those of direct current methods, but the measured parameter is different Induced polarization can be uesful in detecting minerals, and in distinguishing clay from other sediments with comparable resistivitiesĢ0 Induced polarization No IP effect example I AB Transmitted current T on T off t V MN - Voltage at receiver electrodes V DC V DC tĢ1 Induced polarization Example with IP effcts I AB Transmitted current T on T off V MN - Voltage at receiver electrodes t V DC IP measurement V DC IP measurement tĢ2 What causes the induced polarization effect? bulk water σ = 1 F σ W surface conduction σ = σ surf surface (grain) polarization σ = iσ surf E E EĢ3 Interpretation Key requirements for a successful interpretation of geophysical results: Good inversion result (low data misfit and correct inversion settings, we will get back to that) Good visualization of inversion results (correct axis and color scales, we will also get back to that) Prior general knowledge of the geology in the area Knowledge about expected resistivity ranges for geological bodies found in the area Any additional information if accessible (borehole logs and reports, other geophysical surveys)Ģ4 Interpretation example Minerals, pollution, ion rich water? Dry sand? Saltwater intrusion?Ĥ7 Processing / removal of outliers Advanced example Before: After:Ĥ8 Processing / removal of outliers statistical 1.
Converting res2dinv files to res3dinv files software#
Lassen Aarhus GeoSoftwareĢ Program Theory - Introduction to DC and IP theory - Introduction to inversion theory Res2DInv and Res3DInv - Distribution and installation of software - 2D inversion and hands om exercises - Processing, inversion and troubleshooting - Presentation and visualization - 3D inversion and hands om exercises - Same procedure - Questions etc.ģ Terminology DC = Direct current method = ERT = Electrical Resistivity Tomography = ERI = Electrical resistivity Imaging etc. 1 Res2DInv and Res3DInv - Theory and demonstration Knud Valdemar T.