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Alfred Bespalov
Alfred Bespalov

How to Use Interpex IX1D V350 for Multi-Stage and Dynamic Inversion


Interpex IX1D V350: A Comprehensive Review




If you are looking for a software that can handle 1D geophysical inversion for various methods, you might want to check out Interpex IX1D V350. This software is designed to process, interpret and display data from DC resistivity, IP, MT and EM sounding surveys. In this article, we will review the features, benefits and limitations of Interpex IX1D V350 and help you decide if it is the right tool for your needs.




Interpex IX1D V350



What is Interpex IX1D V350?




Interpex IX1D V350 is a software developed by Interpex Limited, a company that specializes in PC based geophysical software. Interpex IX1D V350 is the latest version of the software that was first released in 1996. It is a 1D inversion program that can handle data from different geophysical methods, such as:


  • DC resistivity: It supports most DC resistivity arrays, including Wenner, Schlumberger, Dipole-dipole, Pole-dipole and Pole-pole arrays. It can also handle resistivity only or resistivity with IP measurements in terms of PFE, chargeability in msec or phase in mrad.



  • IP: It supports induced polarization measurements with DC resistivity data. It can handle PFE, chargeability in msec or phase in mrad.



  • MT: It supports magnetotelluric sounding inversion with apparent resistivity and impedance phase.



  • EM: It supports frequency-domain electromagnetic sounding inversion with horizontal coplanar, vertical coplanar and vertical coaxial configurations. It can handle in-phase and quadrature measurements made versus frequency, coil spacing or instrument height. Measurements can be in percent or ppm of the primary field. It also supports EM conductivity measurements in terms of apparent conductivity in milliSiemens/m.



  • TEM: It supports transient electromagnetic sounding inversion with central loop, fixed loop or coincident loop configurations (additional license fee required).



Interpex IX1D V350 can import data or models from flat ASCII files or create data by spreadsheet entry or copy/paste from another spreadsheet. It can also read in a resistivity well log from a flat ASCII file and reduce it to several discrete layers by fitting straight line segments to the cumulative conductance in the log. The resulting model can be copied to the model in the current data set for further modeling.


What are the benefits of Interpex IX1D V350?




Interpex IX1D V350 has several benefits that make it a useful software for geophysical inversion. Some of these benefits are:


  • It has a user-friendly interface that allows for dynamic column and row manipulations to make model entry more convenient.



  • It has fix flags that allow the user to fix parameters for the inversion calculations. Either the layer thickness (or depth) and/or the resistivity can be fixed in the inversion process.



  • It has an option to create a dynamic inversion, i.e. by using a sequence of inversions within a single operation. The solutions obtained in this way are stored as separate models for later management and further processing. This feature provides an easy way of obtaining a series of low cost, representative models in order to reduce the development period of time and the cost associated with inversion experiments.



  • It has a multi-stage inversion optimization that allows the optimization of geological inversion parameters (depth, resistivity, porosity) independently in different inversion runs. Multi-stage inversion optimization is useful when the inversion results are not that good or the model is complex. Multi-stage inversion optimization provides an easy way to optimize inversion parameters in smaller numbers of inversions with a much greater cost effectiveness.



  • It supports both in-plane and triaxial symmetries. In-plane symmetry is the best solution for most modeling areas in which the geological structures are high and straight (cubic or branched), while the study area is fairly limited in size and the resolution is not so high. Triaxial symmetry is the best solution for modeling areas where the geological structures are complex and irregular, while the study area is fairly limited in size and the resolution is not so high.



  • It uses multi-resolution modeling (MRM) as the default modeling type. Multi-resolution modeling allows for different resolutions at different depths or frequencies. This feature improves the accuracy and stability of the inversion results.



What are the limitations of Interpex IX1D V350?




Interpex IX1D V350 also has some limitations that should be considered before using it. Some of these limitations are:


  • It is a 1D inversion program, which means it assumes that the subsurface is horizontally layered and isotropic. This assumption may not be valid for complex geological settings where there are lateral variations or anisotropy.



  • It requires a good initial model to start the inversion process. If the initial model is too far from the true model, the inversion may not converge or may converge to a local minimum.



  • It does not have a graphical display of data or models. The user has to rely on external programs to plot or visualize the data or models.



  • It does not have a built-in quality control or error analysis tool. The user has to manually check the data quality and error estimates before and after the inversion.



  • It does not have a direct link to other geophysical software or databases. The user has to export or import data or models using flat ASCII files.



Conclusion




Interpex IX1D V350 is a software that can handle 1D geophysical inversion for various methods, such as DC resistivity, IP, MT and EM sounding surveys. It has several features and benefits that make it a useful tool for geophysical interpretation and modeling. However, it also has some limitations that should be taken into account before using it. Interpex IX1D V350 is suitable for users who have some experience with geophysical inversion and who are looking for a flexible and powerful software that can handle different types of data and methods.


How to use Interpex IX1D V350?




Interpex IX1D V350 is a software that can be installed on Windows operating systems. It requires a USB key to run, which can be purchased from Interpex Limited. The software can be downloaded from the Interpex website or from a direct link provided by the company. The installation process is simple and straightforward, and the user manual provides detailed instructions on how to set up and use the software.


To use Interpex IX1D V350, the user needs to have data from one of the supported geophysical methods. The data can be imported from flat ASCII files or created by spreadsheet entry or copy/paste from another spreadsheet. The user can also read in a resistivity well log from a flat ASCII file and reduce it to several discrete layers. The data can be displayed in a sounding window, where the user can edit the header information, such as location, elevation, rotation, reference, mode and statics.


The user can then enter a starting model for the inversion process, either by using depth models or layer thickness models. The model can be entered from the keyboard or copy/pasted from a spreadsheet. The user can also use fix flags to fix parameters for the inversion calculations, such as layer