Result (Loke 2004). 3D resistivity survey is expensive and takes time, especially when the area to be surveyed is large. However, the development of multi-channel resistivity survey instruments, faster microcomputers and inversion software now make it possible to take more than one reading at a time. In last decade advances in resistivity equipment and processing software have allowed for deployment of large number of receiver dipoles over a survey area and inversion of the measured data may be performed using a 3D approach.
ERTLab Solver is the resistivity and IP inversion module that offers full three-dimensional topographical modelling and inversion. Its numerical core based on tetrahedral FEM allows inputting of complex topographic information and inverting data sets collected using surface, borehole and surface-to-hole array configurations.
Data Collation and Inversion The synthetic apparent resistivity data computed for the series of approximated 2D model structures were then collated to 3D data set using RES2DINV inversion software (Loke and Barker, 1996). The collations arranged the 2D apparent resistivity data and the. Seamless inversion of very long survey lines using sparse inversion techniques (RES2DINV only license includes limited used of RES3DINV 3D inversion program) RES2DINV software is designed to interpolate and interpret field data of electrical geophysical prospecting (2D sounding) of electrical resistivity (conductivity) and induced polarization. The resistivity method is frequently used in the investigation of the shallow parts of the earth. Interpretation of such data is usually done assuming a layered earth.
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ERTLab Sequencer is a practical tool for the creat..
ERTLab Sequencer is a practical tool for the creation of 2D and 3D arrays/schedules of electrical resistivity measurements.
ERTLab Viewer is a powerful graphical environment ..
ERTLab Viewer is a powerful graphical environment to represent resistivity/IP models. Visualize inverse and forward models in a variety of ways, including sections, volumes and isosurfaces. These may be spun and re-oriented in real-time.
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Over the last 25 years, there has been a revolutionary change in the resistivity (and IP) surveying method. Until the early 1990's, the resistivity method has been used as a one-dimensional (1D) tool where quantitative modelling was confined to simple horizontal layers which are not sufficiently accurate for complex geological environments. However due to recent developments in field equipment design, interpretation software and microcomputer technology, two-dimensional (2D) and three-dimensional (3D) surveys are now practical geophysical exploration tools for environmental, engineering and mineral exploration studies. A recent development is 4-D time-lapse surveys.
Over the last 20 years, there has been an explosive growth in the number of commercial multi-electrode resistivity meter systems for electrical imaging surveys sold by companies in Europe, North America and Asia. A set of free lecture notes (Spanish version aso available) which cover a number of practical aspects of 2D and 3D electrical imaging surveys, including field methodology and data interpretation, is available in the 'Downloads' page of this website.
The second development that has made 2D and 3D electrical imaging surveys practical tools is fast interpretation software that can be used on commonly available Windows based microcomputers. At this site, you can download working demo versions of the RES2DINV and RES3DINV inversion software. The demo versions have some limitations, but you can use them to invert most common resistivity and IP data sets. For current RES2DINV and RES3DINV users, you can update the software by just downloading the same files.
RES2DINV is the 2D resistivity and IP inversion software. Besides normal land surface surveys, it also supports underwater and cross-borehole surveys. In addition to the standard Wenner (alpha, beta, gamma), Wenner-Schlumberger, pole-pole, pole-dipole, inline dipole-dipole, equatorial dipole-dipole arrays; it also supports non-conventional electrode arrangements. The program supports survey lines with up to 16000 electrodes and 27000 data points. Multicore CPU support is now available in RES2DINVx64.
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RES3DINV is the 3D resistivity and IP inversion software, and it is probably the first widely available commercial software of this type. 3D surveys are more time-consuming and expensive to carry out, but could be useful for very complex geological situations. To reduce costs to the user, RES3DINV is sold as a combined package with RES2DINV which costs only about 25% more than the RES2DINV program alone. It supports surveys with up to about 10000 electrodes and 150000 data points. It is probably more than an order of magnitude faster than some other commercially available 3D inversion software. In addition to surveys with a traditional rectangular grid of electrodes, it also supports surveys with trapezoidal grids and even arbitrary electrodes arrangements which is common in rugged and/or forested areas. It now supports parallel calculations on multi-core CPUs that significantly reduces the inversion time for very large survey grids. On a modern quad-core based microcomputer, the data inversion takes less than a minute for small surveys with 200 electrodes in a flat area, to a day for extermely large surveys with with thousands of electrodes in rugged terrain. Support for mult-core CPUs is now available with RES3DINVx64.
Dr. M.H.Loke, the developer of the RES2DINV and RES3DINV software, obtained a P.hD. from the School of Earth Sciences, The University of Birmingham in 1994 under the supervision of Dr. R.D.Barker. He is the Director (Software Development and Technical Support) of Geotomo Software Sdn Bhd. The company has many clients worldwide in academic institutions, engineering and environmental survey, groundwater and mineral exploration companies. His present research interests are in fast 2D and 3D inversion methods for geoelectrical data, optimisation of electrode arrays for 2D and 3D surveys, time-lapse inversion techniques, fast numerical methods and applications of parallel programming techniques in geophysical modelling. He is a member of the editorial board of the Journal of Applied Geophysics and Near Surface Geophysics, and also an invited peer reviewer for the UK Times and QS World University Ranking systems. He received the SEG-EEGS Frank Frischknecht Leadership Award in March 2019 at the SAGEEP conference in Portland, Oregon, USA. For a more detailed biography, including a list of publications, please download the following pdf file. M.H Loke Biography
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