Build geo-sections
right in your browser.
GeoSection turns your subsurface data into clean, presentation-ready geo-sections — with lithology, topography and one-click export. No accounts, no uploads to a server.
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Three free builders, one toolkit
Pick the log you need — correlation section, graphic sedimentary log, or geotechnical borehole log.
Geo-Electric Section
Multi-sounding VES correlation panels with lithology, topography and distance.
Open Section builderSedimentary Log
Graphic sed log (Nichols / SedLog style) with grain size, structures, fossils & palaeocurrent.
Open SedLogGeotechnical Borehole Log
Single-boring log with USCS, SPT blows, water levels, descriptions and elevation.
Open GeoLogEverything you need for a clean section
The same section engine used inside Resicloud — extracted as a free standalone tool.
Multi-sounding profiles
Drop in any number of VES soundings and arrange them along your profile line — equal-spaced or by real distance.
Smart lithology
Auto-suggested lithology from resistivity ranges, with a built-in library plus your own custom patterns and colors.
Topography & depth
Toggle ground-surface topography and control max depth to focus on the layers that matter for your study.
Distance-aware
Use lat/lon or along-profile distance to keep horizontal scale geologically honest.
Excel round-trip
Import your VES models from Excel and export the section dataset back — same shape, no lock-in.
PNG export
One-click export of the rendered section as a high-resolution PNG, ready for your reports and presentations.
Like GeoSection? Resicloud is next.
A full cloud workspace for resistivity surveys: projects, sites, VES & ERT data, inversion, QC and reporting — built by Geotech4All. GeoSection is a free preview of what's inside.
Meet SoilLab — field & lab geotechnics in one place.
A geotechnical suite covering boreholes, SPT, CPT and lab tests (PSD, Atterberg, compaction, shear). GeoLog inside GeoSection is the entry point — SoilLab is the full workspace.