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InverseLite 5


Getting Started








1.0
Introduction


Interprets and creates presentation graphics and reports for Schlumberger and Wenner Configuration Resistivity Soundings.


1.1
Home Screen



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2.0
InverseLite Data Input


There are 2 ways to enter data into InverseLite 5, (i) by opening an exisiting data file (.inv) and (ii) manual entry into the data grid


2.1
Opening existing files


To open a preexisting data file click on open on the main Ribbon then select a .inv data file



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InverseLite would then Open the data in the data grid as well as plot the Apparent Resistivity Sounding curve from the data



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2.2
Entering Data Manually


Data can be manually entered by entering the sounding data; Electrode Spacing (AB/2), Apparent Resistvity; directly into the grid, the grid will automatically generate new rows for you.


When you are done entering data,


i.
Select a sounding configuration (Schlumberger or Wenner) from the main ribbon


ii.
click on save on the main ribbon, give a name and click save.


Note
: InverseLite requires that data must first be saved before you can process it



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2.3
Generating InverseLite Input (.inv) Files


The easiest way to work with inverselite (especially when working with large number of soundings) is to generate the files using a text editor. For this guide I use Windows Notepad, though any other text editor would do.


The file structure



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3.0
Data Processing


Interpreting data is straight forward; the inversion procedure is based on the layered earth model. You need to supply the number of layers of the desired model, as well as an initial estimate of the model parameters. InverseLite can compute an initial estimate of the model,


Let’s explore Interpretation using the automatic initial model (guess model)


3.1
Inversion with Automatic Initial Model Parameters


With the input data loaded, as explained in Chapter 2,


1.
Specify Number of Layers



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select the number of desired model layers (either by clicking on the plus symbol till textbox contains the desired number or using the little arrows beside the textbox to select the number




2.
Generate Initial Estimates



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Click on the Guess button to automatically generate an initial estimate.



This process will populate the Model data grid with an initial estimate, and a plot of the input model



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3.
Compute the Apparent Resistivity Curve


It is always a good practice to see how good an estimate we have by computing the forward profile for the generated model. This produces a comparative sounding curve as well as the fitting error



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Click on the Forward button


This yields



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Note the fitting error as well as visually appraise the fitness of the field data and the forward model.


4.
Inversion



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Initiate the inversion process by clicking on the Invert button




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The final inversion result is shown in the Model Grid and the layer model is plotted as well.



3.1
Inversion with manual Initial Model Parameters


In cases where we have information on the geology of the sounding location we may opt to enter initial estimates of the layer model to start the inversion process. In this case load the input data normally as explained in Chapter 2, then


1.
Select the Number of Layers



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select the number of desired model layers (either by clicking on the plus symbol till textbox contains the desired number or using the little arrows beside the textbox to select the number



2.
Edit any data that might be in the model grid




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Edit the layer model grid by clicking and typing in new values


Forward computation gives



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3.
Invert the data


Click on Invert Button



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Initiate the inversion process by clicking on the Invert button




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4.0
Generating Output


InverseLite can generate two types of output


i.
Microsoft Word Report File


ii.
Output Screen Graphics



4.1
Generating Microsoft Word Report File


Simply Click on the Save to Word Button on the main ribbon, this will start the Word application and open a file with the new report



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Note
: This process requires that Microsoft Word is installed on the system



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4.1
Generating Output Screen Graphics


The output screen graphics presents a graphics of the out as a image file in the PNG format.


Simply click on the Save to PNG button



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This will generate the Screen Graphics output as an image file and load it your default imaging application



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