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One-dimensional direct and inverse simulation of DC resistivity data

general information
RESIX is an interactive, graphical program of direct and inverse modeling, designed to interpret the sounding data by the resistance method, presented in the form of a model of a layered medium (1-dimensional). Sounding curves can be introduced as a function of A for sounding by a Wenner installation, or bipolar sounding, AB / 2 - for sounding by a Schlumberger installation, R - for dipole sounding, or N - for two-dipole sounding, or sounding by an asymmetric installation.

Sensing curve values are introduced as apparent resistivity as a function of separation. Direct modeling allows you to calculate a generalized sounding curve by the resistance method for a model that includes up to ten flat layers. Resistance sounding curves are calculated using linear filters.

Data offset with overlapping curve segments is processed automatically by shifting the generalized curve to compensate for shifts between data segments. This is done on the basis of the assumption that the data for the largest spacings are correct, by shifting the segments at small spacings, which allows you to attach data with a larger spacing. Alternatively, you can shift the data curve itself to fit the segment with the largest, or smallest, spacing. This can be done either automatically or manually, in interactive graphic mode, using the Shift Segments option.

Masking of data is done in an interactive graphic module, by hovering and clicking on a data point. From these points you can remove the mask, or remove them, in accordance with the needs of the user. Masked points do not affect the magnitude of the error or inverse calculations. Entering an interactive model using the mouse allows the user to see changes in the calculated curve as he enters the model graphically. Using the "mouse" you can also change the size and position of graphic objects.

Inverse modeling allows you to get the model that best matches the data by fitting it using the least squares method, using ridge regression to interactively adjust the initial parameters of the model. You can impose restrictions on some initial parameters of the model, so that they are not measured during execution. Source models for inversion can include up to 8 layers. Direct models can include up to 10 layers. You can apply constants by fixing (or freezing) the parameter, or by setting limits for the parameter. As parameters, you can apply the layer thickness determined by the resistance method, or resistivity / depth to the bottom of the layers.

The results of direct or inverse modeling can be sent to a printer or plotter to prepare a report, or printed on paper. In addition, the results can be saved in a binary file on a direct-access disk for later reading. Inverse modeling can be done in maintenance-free package mode. Resix provides several options for displaying observational data, theoretical (direct) data, and a section of the geoelectric model used to calculate the direct characteristic. This information can be graphically displayed using a dot matrix printer, a laser printer, or a pen plotter. You can also print the data and section of the model in tabular form, page by page, on a text printer.

Data storage is carried out in a new database file format, which holds up to 200 data sets (or sensing curves). The file size is determined by the number of sounding curves that are placed in it.

Standard components

Resix v3 software, and instruction manual.

ООО "АТТ Систмс"

Locations: Russia Moscow
Main Products/Services: Geophysical equipment, software